Panasonic U-120ME2U9 Service Manual
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Panasonic U-120ME2U9 Service Manual

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U-72ME2U9
U-96ME2U9
U-120ME2U9
U-144ME2U9
U-72ME2U94
U-96ME2U94
U-120ME2U94
U-144ME2U94
Model No.
Outdoor Unit
Type
Outdoor Unit Type
ME2 2WAY VRF System
 To be connecting Indoor Units
Indoor Units
Type
Indoor Unit Type
U2
4-Way Cassette 36"x36"
S-07MU2U6
4-Way Cassette 24"x24"
S-07MY2U6
Y2
S-07MD1U6
D1
1-Way Cassette
Concealed Duct
F2
S-07MF2U6
-Medium Static
Concealed Duct
S-07MM2U6
M2
-Low Static
Concealed Duct
E1
-High Static
T2
Ceiling
K2
S-07MK2U6
Wall Mounted
S-07MP1U6
P1
Floor Standing
R1
Concealed Floor Standing
S-07MR1U6
85464849337007
2WAY VRF System
72
U-72ME2U9
U-96ME2U9
U-72ME2U94
U-96ME2U94
7
9
12
S-09MU2U6
S-12MU2U6
S-09MY2U6
S-12MY2U6
S-09MD1U6
S-12MD1U6
S-09MF2U6
S-12MF2U6
S-09MM2U6
S-12MM2U6
S-12MT2U6
S-09MK2U6
S-12MK2U6
S-09MP1U6
S-12MP1U6
S-09MR1U6
S-12MR1U6
Nominal Capacity
96
120
U-120ME2U9
U-120ME2U94
Nominal Capacity
15
18
24
S-24MU2U6
S-18MY2U6
S-15MF2U6
S-18MF2U6
S-24MF2U6
S-15MM2U6
S-18MM2U6
S-18MT2U6
S-24MT2U6
S-18MK2U6
S-24MK2U6
S-15MP1U6
S-18MP1U6
S-24MP1U6
S-15MR1U6
S-18MR1U6
S-24MR1U6
This air conditioner uses the refrigerant R410A.
Order No. SBPAC1404012CE
144
U-144ME2U9
U-144ME2U94
36
48
S-36MU2U6
S-36MF2U6
S-48MF2U6 S-54MF2U6
S-36ME1U6
S-48ME1U6
SM830237-07
REFERENCE NO.
54

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Summary of Contents for Panasonic U-120ME2U9

  • Page 1 Order No. SBPAC1404012CE 2WAY VRF System U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9 U-72ME2U94 U-96ME2U94 U-120ME2U94 U-144ME2U94 Model No. Outdoor Unit Nominal Capacity Type Outdoor Unit Type U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9 ME2 2WAY VRF System U-72ME2U94 U-96ME2U94 U-120ME2U94 U-144ME2U94  To be connecting Indoor Units...
  • Page 2 IMPORTANT! When Transporting Please Read Before Starting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees This air conditioning system meets strict safety and when lifting to reduce strain on your back. Sharp edges or operating standards.
  • Page 3 • Do not leak refrigerant while piping work for an installation or re-installation, and while repairing CAUTION refrigeration parts. Handle liquid refrigerant carefully as it may cause • Do not touch the air inlet or the sharp frostbite. aluminum fins of the outdoor unit. You When Servicing may get injured.
  • Page 4 Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing Material: Use clean, dry, free of oil, refrigeration grade, seamless, phosphorous deoxidized copper tube rated for R410A only. Wall thickness shall comply with the applicable legislation. The minimal wall thickness must be in accordance with the table below.
  • Page 5 3-2. Use R410A exclusive cylinder only. Valve Single-outlet valve (with siphon tube) Liquid refrigerant should be recharged with the cylinder standing on end as shown. Liquid New refrigerant R410A cannot be used for earlier models 1. Compressor specifications are different. If recharging a R22 or R407C compressor with R410A, durability will significantly decrease since some of the materials used for compressor parts are...

  • Page 6: Table Of Contents

    — CONTENTS — Section 1: CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Introduction .
  • Page 7 Section 5: TROUBLE DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Contents of Remote Controller Switch Alarm Display .
  • Page 8 – MEMO –...

  • Page 9: Control Functions

    2WAY VRF SYSTEM 2WAY VRF SYSTEM Contents Contents Control Functions Control Functions 1. CONTROL FUNCTIONS Introduction ............Selecting Outdoor Unit for Operation .

  • Page 10: Introduction

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 1. Introduction Control Functions 1. Introduction Control Functions 1. Introduction The ME2U series outdoor units for USA is a system that allows multiple outdoor units to be connected. All the outdoor units do not utilize the sub units that were used in earlier systems. The O/U.ADD of outdoor unit PCB where the unit is set to “1”...

  • Page 11: Selecting Outdoor Unit For Operation

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 2. Selecting Outdoor Unit for Operation Control Functions 2. Selecting Outdoor Unit for Operation Control Functions Outdoor Unit Operating Rules (1) Outdoor Unit Operating Rules As a result of setting the main outdoor and sub outdoor units due to the O/U.ADD setting, the order of priority for the outdoor units is determined in small values of O/U.ADD sequence.
  • Page 12 2WAY VRF SYSTEM 2WAY VRF SYSTEM 2. Selecting Outdoor Unit for Operation Control Functions 2. Selecting Outdoor Unit for Operation Control Functions (3) Outdoor Unit Stop Rules 1. Stopping of all outdoor units When all outdoor units must stop, all units will stop in order of unit No. every one second. 2.

  • Page 13: Compressor Control

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions (1) Compressors Mounted in the Outdoor Units Placement of compressor seen from the top Type 72, 96 Type 120, 144 1st compressor 1st compressor 2nd compressor Front side Front side...
  • Page 14 2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions 2. Operating compressors The compressor with higher priority order starts according to the priority orders described on previous page. 3. Stopping compressors The compressor with lower priority order stops according to the priority orders described on previous page. (3) Operation When Starting 2 Compressors Mounted in Outdoor Unit When necessary capacity gradually increases and one more inverter compressor is additionally started under the present operating compressor, reduce the compressor frequency to 25Hz temporarily and then start an additional...
  • Page 15 2WAY VRF SYSTEM 3. Compressor Control Control Functions (6) Capacity Control (Roadmap control) 1 The capacity control by the compressors is performed according to the pressure sensor attached to the outdoor unit and temperature thermistor attached to the indoor / outdoor unit heat exchanger. * With roadmap control, the pressure detected by the pressure sensor is converted to saturation temperature before it is used by microcomputer.
  • Page 16 2WAY VRF SYSTEM 3. Compressor Control Control Functions 6-2. Condensation temperature adjustment by roadmap control The area B target temperature is different due to cooling and heating operation. Target lower temperature Target upper temperature (Tc_tgt_min) (Tc_tgt_max) Cooling 127.4°F (53.0°C) 131.0°F (55.0°C) Heating 118.4°F (48.0°C) 123.8°F (51.0°C)
  • Page 17 2WAY VRF SYSTEM 3. Compressor Control Control Functions 6-3. Protection Control Compressor discharge temperature protection The compressor capacity is controlled according to the table below. *Discharge temperature that is used for this control is the highest temperature among all compressors. Discharge temp.
  • Page 18 Outdoor temperature 114.8°F (46°C) Outdoor temperature 109.4°F (43°C) Current table <Normal> U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 A Normal status: Use the same values of 1st compressor and 2nd compressor. Type of outdoor unit unit: Ampere Current limit 1 Maximum current 1 H 22.5...
  • Page 19 2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. Compressor Control Control Functions 3. Compressor Control Control Functions U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Use the same values of 1st compressor and 2nd compressor. Type of outdoor unit unit: Ampere Current limit 1 19.5 19.5 19.5...

  • Page 20: Output Of Pcb

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions Items Remarks Indication on PCB 4-way valve Save valve SAVE Refrigerant control valve Refrigerant balance valve Solenoid valve Oil recovery valve ORVR By-pass valve Accumulator valve valve MOV for heat exchanger 1...
  • Page 21 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions (3) Refrigerant Control Valve [RCV] The main purpose of this valve is to adjust the flow of refrigerant (refrigerant volume). When the outdoor unit receives a sign of refrigerant shortage, the valve opens and refrigerant is supplied from the receiver tank to the system.
  • Page 22 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions (4) Refrigerant Balance Valve [RBV] The main purpose of this valve is to adjust the flow of refrigerant (refrigerant volume) in the evaporator. When the outdoor unit receives a sign of overcharged refrigerant, the valve opens and refrigerant is recovered at the receiver tank.
  • Page 23 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions (5) Oil Recovery Valve [ORVR] The purpose of this valve is to recover oil from the oil separator of its own outdoor unit or balance tube to the compressor.
  • Page 24 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions (9) MOV for Heat Exchanger [MOV1, MOV2] 9-1. Type of expansion valves MOV1 : For upper side heat exchanger MOV2 : For lower side heat exchanger 9-2.
  • Page 25 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Special Control Control Functions 4. Output of PCB Control Functions (10) SC Circuit Expansion Valve [MOV4] 10-1. Cooling SC Control During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cooling) approaches 32°F (0°C).

  • Page 26: Outdoor Unit Fan Control

    2WAY VRF SYSTEM 5. Outdoor Unit Fan Control Control Functions (1) Fan Mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 15 steps (15 modes). However, fan modes 14 and 15 can only be used if high static pressure mode has been set. * For information concerning EEPROM settings, refer to the field application functions.
  • Page 27 2WAY VRF SYSTEM 2WAY VRF SYSTEM 5. Outdoor Unit Fan Control Control Functions 5. Outdoor Unit Fan Control Control Functions 1-2. Snow removal control Independent control of outdoor unit This control is intended to prevent snow from accumulating on stopped fans. The fan motor rotates at 500rpm in the below conditions even if the outdoor unit stops.
  • Page 28 2WAY VRF SYSTEM 5. Outdoor Unit Fan Control Control Functions 1-3. Silent mode This unit includes 2 types of silent modes. See the table under the section “(1) Fan Mode” for maximum fan mode in silent mode. Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
  • Page 29 2WAY VRF SYSTEM 2WAY VRF SYSTEM 5. Outdoor Unit Fan Control Control Functions 5. Outdoor Unit Fan Control Control Functions (2) Fixed Initial Fan Mode For the first 30 seconds after operation starts, the mode is fixed at the initial mode which was calculated from the relationship between the outdoor air temperature and the outdoor unit horsepower.

  • Page 30: Outdoor Unit Ccu (Command Controller Unit) Control

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6. Outdoor Unit CCU (command controller unit) Control Control Functions Some actuators of indoor unit are controlled by CCU. MOV of Indoor Unit 1-1. Indoor unit without RAP valve kit unit : pulse Operating Operating...
  • Page 31 2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6. Outdoor Unit CCU (command controller unit) Control Control Functions unit : pulse 1-2. Indoor unit with RAP valve kit Operating Operating Operating Thermostat mode of mode of mode of...
  • Page 32 2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6. Outdoor Unit CCU (command controller unit) Control Control Functions (2) RAP Valve Kit Operating Operating Operating Thermostat mode of mode of mode of RAP valve kit ON/OFF ON/OFF indoor unit...
  • Page 33 2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6. Outdoor Unit CCU (command controller unit) Control Control Functions 3-2. Heating mode The indoor unit fan in heating mode is stopped from the CCU in the following condition. Discharge air temperature of indoor unit ≤...
  • Page 34 2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Outdoor Unit CCU (command controller unit) Control Control Functions 6. Outdoor Unit CCU (command controller unit) Control Control Functions * Operating time “XX” under the section “(4) Drain Pump Control” described on previous page is able to set in EEPROM of the main outdoor unit.

  • Page 35: Oil Control

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Oil Control 7. Oil Control Control Functions Control Functions (1) Oil Level Oil level State Conditions of oil level in compressor Judgment Sufficient The compressor contains sufficient oil. There is no problem. Confirm that oil is improved after performing Possibility of There will be a risk of oil shortage soon.
  • Page 36 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Oil Control Control Functions 7. Oil Control Control Functions System Oil Recovery Control The system oil recovery control is performed by operating all the systems. If the stopped outdoor unit exists, the unit starts operating and the system oil recovery control is performed. 5-1.
  • Page 37 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Oil Control Control Functions 7. Oil Control Control Functions 5-2. Simplified flow of system oil recovery control The system oil recovery control shall be performed as the flow mentioned below. Normal operation → System oil recovery control → Normal operation In the case of cooling mode Control time For 2 minutes...

  • Page 38: Way Valve Adjustment Control

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 8. 4-Way Valve Adjustment Control Control Functions 8. 4-Way Valve Adjustment Control Control Functions The purpose of this control is to change over the 4-way valve appropriately with big pressure difference. This control is performed at the following conditions. The first operation after turning on power supply to outdoor unit.

  • Page 39: Defrost Control

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Defrost Control Control Functions 9. Defrost Control Control Functions (1) Type of Defrost Control This system uses the following 2 defrosting systems. System configuration Name of defrost control Only 1 outdoor unit in the refrigerant system Reverse cycle defrost 2 or more outdoor units in the refrigerant system Outdoor unit cycle defrost...
  • Page 40 2WAY VRF SYSTEM 1 outdoor unit in the refrigerant system Reverse cycle defrost 2WAY VRF SYSTEM 9. Defrost Control Control Functions 9. Defrost Control Control Functions 2 or more outdoor units in the refrigerant system Outdoor unit cycle defrost Heating Operation Set Time (Defrosting Operation Prohibiting Time) (4) Constraint Conditions When the heating operation time at system has exceeded “XX”...
  • Page 41 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Defrost Control Control Functions 9. Defrost Control Control Functions (7) Outdoor Unit Cycle Defrost Outdoor unit cycle defrost is performed in systems where 2 or more outdoor units are connected to the refrigerant system.

  • Page 42: Upper Current Limitation Mode (Demand Control)

    There are 2 types of control; demand control and infinity limit in the upper current limitation mode. Either of them is controlled by the lower current limitation. The standard value of the limit current is listed in the table below. U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Type of outdoor unit Cooling mode 15.6 A...
  • Page 43 When forced thermostat OFF with demand control active, “demand - actived” displayed. (2) Upper Current Limitation Mode Even if the demand control is not performed, upper current limitation is restricted. U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Type of outdoor Unit Limited ratio against standard value...

  • Page 44: Backup Operation

    3WAY SYSTEM 2WAY VRF SYSTEM 12. Backup Operation Control Functions 11. Backup Operation Control Functions (1) Automatic Backup Operation This system includes a function for automatic backup operation. An alarm is displayed on the remote controller to inform the user that a failure has occurred. 1-1.
  • Page 45 3WAY SYSTEM 2WAY VRF SYSTEM 12. Backup Operation Control Functions 11. Backup Operation Control Functions Alarm list 2 (Backup operation continues as long as the problems are not solved.) Alarm display DISCH1 thermistor at the discharge of 1st compressor reading is abnormal DISCH2 thermistor at the discharge of 2nd compressor reading is abnormal EXG1 thermistor at the gas side of 1st heat exchanger of the outdoor unit has failure (EXG1)
  • Page 46 (1) Reduce the number of outdoor units set at outdoor unit No.1 by only the number of failed outdoor units. (2) At the SW7 switch on the PCB of the failed outdoor unit, turn ON the switches for all compressor to disable, and turn ON the “BACKUP” switch (SW7). U-72ME2U9 U-120ME2U9 Type of outdoor unit U-96ME2U9 U-144ME2U9...
  • Page 47 2-2. Disabling operation of one compressor (Type: 120, 144) At the SW7 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to disable, and turn ON the “BACKUP” switch (SW7). U-120ME2U9 U-120ME2U94 Type of outdoor unit...

  • Page 48: Other Functions

    2WAY VRF SYSTEM 12. Other Functions Control Functions (1) Auto Change over Cooling/Heating Function It is possible to select auto change over cooling/heating mode in each remote controller even in 2WAY VRF system. The system changes to cooling or heating operation according to number of thermostat ON mode. The system selects the mode that has more number of units with thermostat ON.
  • Page 49 3WAY SYSTEM 2WAY VRF SYSTEM 13. Other Functions Control Functions 12. Other Functions Control Functions (2) Maintenance Function for Power Supply Stop of Indoor Unit (E06 ignore) The system can continue operation even if outdoor unit cannot communicate with some indoor units. It is necessary to set to EEPROM the allowed number of operating indoor units not to be able to communicate.

  • Page 50: Detailed Settings In Eeprom Of Outdoor Unit

    2WAY VRF SYSTEM 13. Detailed Settings in EEPROM of Outdoor Unit Control Functions Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. 0=No sensor & control (P) 1=Sensor & control Operation for using snowfall sensor 2=No Sensor &...
  • Page 51 2WAY VRF SYSTEM 13. Detailed Settings in EEPROM of Outdoor Unit Control Functions Never use the DN code unlisted in the following table. (P) : Factory preset mode Item Setting No. Actuation of solenoid valve kit 0=Invalid (P), 1=Valid (EP closed) 0=Continuously set OFF (P) C1 O output change...

  • Page 52: Outdoor Unit Control Pcb

    2WAY VRF SYSTEM 14. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (1) Outdoor Unit Control PCB A747841 ( U-72ME2U9 / U-96ME2U9 ) Terminating resistance pin HIC3 ( CN43 ) ( CN67 ) RC1 plug ( CN75 ) OC plug ( CN76 ) Alarm LED...
  • Page 53 2WAY VRF SYSTEM 14. Outdoor Unit Control PCB Control Functions (2) Outdoor Unit Control PCB A747593 ( U-120ME2U9 / U-144ME2U9 ) Terminating resistance pin HIC7 ( CN78 ) HIC3 ( CN43 ) ( CN67 ) RC1 plug ( CN75 )
  • Page 54 PCB and Functions 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (3) Outdoor Unit Control PCB ACXA73-03280 ( U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 ) EXL1,2(CN60) EXG1,2(CN61) LPS(CN49) OIL1,2(CN54) DISCH1(CN55) DISCH2(CN56) HPS(CN46) TO(CN53) CN34 CN33...
  • Page 55 2WAY VRF SYSTEM 14. Outdoor Unit Control PCB Control Functions (4) Outdoor Unit HIC PCB A747843 (U-72ME2U9 / U-120ME2U9 / U-144ME2U9) (5) Outdoor Unit HIC PCB A747846 (U-96ME2U9) 1 - 47...
  • Page 56 PCB and Functions 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (6) Outdoor Unit HIC PCB ACXA73-02090 (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) 1 - 48 7 - 6...
  • Page 57 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (7) Outdoor Unit Filter PCB A747842 A747845 (U-72ME2U9 / U-120ME2U9 / U-144ME2U9) (U-96ME2U9) ACXA73-02080 (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) 1 - 49 7 - 7...
  • Page 58 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (8) Outdoor Unit FAN PCB A747844 A747844 (U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9) ACXA73-02100 (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) 1 - 50 7 - 8...
  • Page 59 PCB and Functions 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (9) Outdoor Unit Relay PCB ACXA73-02110 (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) 1 - 51 7 - 9...
  • Page 60 PCB and Functions 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions (10) Functions A. ADD pin (2P, White) Auto address setting pin (CN30) Short-circuit this pin for 1 second or longer to automatically set the addresses at the indoor units that are connected to that outdoor unit and are within the same system.
  • Page 61 PCB and Functions 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions Terminating resistance pin For communications circuit impedance matching (3P, Black) (CN67) • A connecting socket (2P, White) is attached to the terminating resistance pin at the time of shipment from the factory.
  • Page 62 2WAY VRF SYSTEM 1. Outdoor Unit Control PCB 14. Outdoor Unit Control PCB Control Functions Table 1. Setting the System Address [SW1: Rotary switch (black), SW2: 2P DIP (black)] SW2 setting SW2 setting Outdoor Outdoor system system setting setting address address (10s digit) (20s digit)

  • Page 63: Outdoor Unit Repair Procedures

    2WAY VRF SYSTEM 2WAY VRF SYSTEM Contents Contents Outdoor Unit Repair Procedures Outdoor Unit Repair Procedures 2. OUTDOOR UNIT REPAIR PROCEDURES Removing Panels ............Discharging Compressor Oil .

  • Page 64: Removing Panels

    • Remove 2 front (upper and lower) panels. (2) Power outlet panel & tubing cover removal • Remove the power outlet panel. • Remove the tubing cover. U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Type: 72, 96 Lower side Upper side...
  • Page 65 2WAY VRF SYSTEM 2WAY VRF SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures 1. Removing Panels Outdoor Unit Repair Procedures U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Type: 72, 96 Lower side Upper side Mounting Plate front panel front panel Tubing cover Power outlet panel Fig.

  • Page 66: Discharging Compressor Oil

    A faulty outdoor unit may remain pressurized. The oil outlet port employs a Schrader-type push-to-release valve. Be careful to avoid accidental oil release when using the port. U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Type: 72, 96 Low-pressure outlet port (for ø5/16”...
  • Page 67 2WAY VRF SYSTEM 2WAY VRF SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2. Discharging Compressor Oil Outdoor Unit Repair Procedures U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Type: 72, 96 Low-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) High-pressure outlet port (for ø5/16”...
  • Page 68 2WAY VRF SYSTEM 2WAY VRF SYSTEM 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2. Discharging Compressor Oil Outdoor Unit Repair Procedures 2-2. Discharging Oil in Compressor Recover the refrigerant in the outdoor unit following the procedures in “4. Recovering Refrigerant.” Remove the compressor and discharge the oil in it.

  • Page 69: Backup Operation

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures 3. Backup Operation Outdoor Unit Repair Procedures This system includes an emergency automatic backup function that allows the air conditioner to operate during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation.
  • Page 70 2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. Backup Operation Outdoor Unit Repair Procedures 3. Backup Operation Outdoor Unit Repair Procedures After recovery work is completed, wire the communication lines between indoor and outdoor CAUTION units again. If it not finished yet, an alarm is emitted immediately. (2) Adjusting the refrigerant for backup operation During backup operation, all of the service valves on the failed unit are closed.

  • Page 71: Recovering Refrigerant

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures The following equipment and tools are required: Jumper wire with clips, adjustable wrench, set of manifold gauge valves specially designed for refrigerant R410A only, vacuum pump, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flathead screwdriver, and outdoor unit maintenance remote controller.
  • Page 72 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures Type: 120, 144 Low-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) High-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Manifold Liquid tube service port gauge (for ø5/16”...
  • Page 73 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-1. Cooling operation (for all units) (1) If the remote controller is used for maintenance of the outdoor unit 1. Connect the outdoor unit maintenance remote controller to the RC connector (3P) (BLU) (CN73) on any one of the outdoor unit control PCBs.
  • Page 74 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4-2-3. Refrigerant recovery procedures (2): (Indoor unit with no ball valve equipped) Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit. The maximum refrigerant storage capacity per a single outdoor unit is approx.
  • Page 75 2WAY VRF SYSTEM 2WAY VRF SYSTEM 4. Recovering Refrigerant Outdoor Unit Repair Procedures 4. Recovering Refrigerant Outdoor Unit Repair Procedures Type: 72, 96 Low-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Manifold gauge High-pressure outlet port (for ø5/16” (ø7.94mm)-dia connector) Refrigerant recovery unit Liquid tube service port (for ø5/16”...

  • Page 76: Checking For Leakage After Repair

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5. Checking for Leakage After Repair Outdoor Unit Repair Procedures 5-1. Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit, carry out the following leakage check. (1) Check that all service valves for gas tubes, liquid tube, and balance tube in the repaired outdoor unit (units necessary to carry out the pressurized leak check) are fully closed.

  • Page 77: Evacuating System

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 6. Evacuating System Outdoor Unit Repair Procedures 6. Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in the repaired outdoor unit and tubing. 6-1.

  • Page 78: Charging Compressor Oil

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7-1. If Refrigerant Has Already Been Charged to Outdoor Unit Be sure to use an exclusive oil-charging tank for charging compressor oil. Prior to charging, carry out vacuum drying inside the tank and take care that no air (in the form of bubbles) is permitted to enter the tank.
  • Page 79 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures (2) Charging compressor oil into oil-charging tank Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil con- tainer.
  • Page 80 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures Type: 120, 144 High-pressure outlet port (for ø5/16” (ø7.94mm)- dia connector) Upper side valve Manifold Low-pressure outlet port gauge Close (for ø5/16”...
  • Page 81 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures Next, follow the instructions in “4-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units.
  • Page 82 2WAY VRF SYSTEM 2WAY VRF SYSTEM 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7. Charging Compressor Oil Outdoor Unit Repair Procedures 7-2. If Outdoor Unit Has Not Been Charged with Refrigerant When a compressor has been replaced or in any other case where the outdoor unit has not been charged with refrigerant, first charge with refrigerant then follow the instructions in “7-1.
  • Page 83 The rated amount of oil is pre-charged in the compressors as given below: Pre-charged amount of oil Model name Compressor model Q'ty gallon liter U-72ME2U9 C-9RVN393H0M 0.502 U-96ME2U9 C-9RVN393H0N 0.502 C-9RVN393H0M 0.502 U-120ME2U9 C-9RVN393H0M 0.502 C-9RVN393H0M 0.502 U-144ME2U9 C-9RVN393H0M 0.502 U-72ME2U94 C-9RVN393H0K 0.502 U-96ME2U94 C-9RVN393H0L 0.502 C-9RVN393H0K 0.502...

  • Page 84: Pumping Out Refrigerant From Outdoot Unit

    2WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8-1. If Remote Controller is Used for Maintenance of Outdoor Unit See “3. Backup Operation” and perform backup operation. (2) Connect the manifold gauge valves at the Lo side to the low-pressure outlet port of the outdoor unit to be repaired.
  • Page 85 2WAY VRF SYSTEM 2WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (4) Use the outdoor unit maintenance remote controller to check the operating status of the indoor units. Check that all units are operating in Heating mode.
  • Page 86 2WAY VRF SYSTEM 2WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8-2. If Remote Controller is Not Available for maintenance of Outdoor Unit See “3.
  • Page 87 2WAY VRF SYSTEM 2WAY VRF SYSTEM 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures 8. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (6) Close the gas tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve.

  • Page 88: Compressor

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-1. Compressor Trouble Diagnosis and Check Methods Generally, compressor failures can be classified into the following categories. (1) Mechanical trouble → (A) Locking (intrusion of foreign objects, galling, etc.) (B) Pressure rise failure (damaged valve, seal, bearing, or other component) (C) Noise (damaged stator rotor, valve, or other component) (2) Electrical trouble →...
  • Page 89 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2. Replacing the Compressor(s) 9-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “3. Backup Operation” and engage backup operation. (2) Follow the instructions in “9-3.
  • Page 90 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-2. Replacing all compressors in a failed unit (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separator in the failed unit.
  • Page 91 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-3. Replacing all compressors in a system (1) Follow the instructions in “2. Discharging Compressor Oil” and drain the oil from the oil separators in all outdoor units.
  • Page 92 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures 9-2-4. Dry core cleaning If burning or other failures occur repeatedly at compressors within the same system, in many cases the cause is acid, sludge, carbon, or other substances that remain in the refrigeration cycle as the result of insufficient cleaning.
  • Page 93 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures (13) If the results show that dry core cleaning is still necessary (for example, a color phase of 4.0 or higher)*, return to Step (11) and repeat until the results are normal (including a color phase of 3.5 or less)*. * Color sample sheet for degree of stain Perform another dry core replacement after approximately 30 hours of system operation.
  • Page 94 (3) Remove the caps and insulator surrounding the compressor. (4) Remove the terminal cap on the compressor. Then disconnect the power terminal. (5) Remove the crankcase heater. U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Type: 72, 96 Type: 120, 144 Insulator for compressor Be careful! It’s breakable here.
  • Page 95 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Type: 72, 96 Remove the post under the box containing the trans. Type: 120, 144 Remove the post under the Insulator for compressor box containing the trans.
  • Page 96 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures (7) Remove the bolts (×3), washer and spacer (rubber spring). CAUTION Protect the sensors and the surrounding plates, rubber, lead wires, clamps, and other items. Remove the discharge thermistor shown in Fig.
  • Page 97 2WAY VRF SYSTEM 2WAY VRF SYSTEM 9. Compressor Outdoor Unit Repair Procedures 9. Compressor Outdoor Unit Repair Procedures Installation (1) Remove the rubber stopper and tube cap (brazed) from the new compressor. (2) Install the crankcase heater onto the new compressor. (3) Temporary attach 3 pieces of cushioning rubber with the bolts in the designated positions on the compressor.

  • Page 98: Replacing Peripheral Parts Of Fusible Plug

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 10. Replacing Peripheral Parts of Fusible Plug Outdoor Unit Repair Procedures 10. Replacing Peripheral Parts of Fusible Plug Outdoor Unit Repair Procedures If the fusible plugs are affected by the heat, refrigerant leaks may occur. CAUTION When welding at the time of replacing the peripheral parts of electronic expansion valve, etc.

  • Page 99: High And Low Pressure Sensors

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures The connection ports for the high and low pressure sensors do not employ Schrader-type push-to-release valves.
  • Page 100 2WAY VRF SYSTEM 2WAY VRF SYSTEM 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures Type: 120, 144 Low Pressure Sensor High Pressure Sensor 2 - 38...

  • Page 101: Outdoor Unit Maintenance Remote Controller

    2WAY VRF SYSTEM Contents Outdoor Unit Maintenance Remote Controller 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 3-2 2.

  • Page 102: Overview

    2WAY VRF SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC4) for 2WAY VRF n About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory (EEPROM) on its PCB. This allows EEPROM data to replace the setting switches that were present on previous PCBs.

  • Page 103: Functions

    2WAY VRF SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display (1) Functions: Button operations can be used to perform the following functions. • Start/stop of all indoor units • Switching between cooling and heating •...

  • Page 104: Ordinary Display Controls And Functions

    2WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Functions on the ordinary display • Connect the special service checker wiring to the outdoor unit PCB. The connection is shown in the figure below. Outdoor unit PCB When connecting the special service (3P, BLU)
  • Page 105 2WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All units start/stop <Operation> (Start/Stop operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
  • Page 106 2WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Display (functions) • Use the temperature setting buttons to change the item code. À Item code Á Item Remarks Outdoor unit alarm Alarm code display No.
  • Page 107 2WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller  XX-YY R.C. Locations where À Á , and  are displayed as Displays the outdoor unit sub-bus address which is shown in Fig. 1. currently selected. XX = Outdoor system address on main bus line (1 –...
  • Page 108 2WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller n Concerning the 7-segment, 4-digit display remote controller timer display The unit Nos. of connected units are indicated by four 7-segment digits ( ) and a colon. Display of unit Nos.

  • Page 109: Monitoring Operations

    2WAY VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> 1. Press and hold the (Check) button and buttons simultaneously for 4 seconds or longer to engage temperature monitor mode. During temperature monitoring, is illuminates.
  • Page 110 2WAY VRF SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display of unit No. 1 (main unit) Description Remarks Indoor unit intake temp. (TA) °C Indoor unit heat exchanger temp. E1 (E1) °C — Indoor unit heat exchanger temp. E3 (E3) °C Indoor unit Discharge air temp.

  • Page 111: Outdoor Unit Alarm History Monitor

    2WAY VRF SYSTEM 5. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure> 1.

  • Page 112: Mode Settings

    2WAY VRF SYSTEM 2WAY SYSTEM 6. Mode Settings 6. Mode Settings Outdoor Unit Maintenance Remote Controller Outdoor Unit Maintenance Remote Controller Display of fi rst 3 digits Setting mode 1 <Operating procedure> Press and hold the (Check) button and (Ventilation) button simultaneously for 4 seconds or longer.

  • Page 113: Remote Controller Functions

    2WAY VRF SYSTEM Contents Remote Controller Functions 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........4-2 2.

  • Page 114: Simple Settings Function

    2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions • This allows the filter lifetime, operating mode priority change, central control address, and other settings to be made for an individual or group- control indoor unit to which the remote controller used for simple settings is connected.
  • Page 115 2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions <Procedure of CZ-RTC4> 1. Press and hold the buttons simultaneously for 4 seconds or longer. 2. “ ”, unit No. “ ” (or “ ” in the case ° of group control), item code “ ”, and settings °...
  • Page 116 2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours 0002 2,500 hours Filter sign ON time (filter lifetime) 0003 5,000 hours 0004 10,000 hours 0005 Use the filter clogging sensor.
  • Page 117 2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit filter lifetime when a high-performance filter or other (filter lifetime) optional product is installed. Reduces the filter sign ON time to 1/2 of the standard time (setting at the time of Degree of filter fouling shipping) for cases when filter fouling is more severe than normal.
  • Page 118 2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions Item code Item Description Set when using a central control device. Central control address Used when setting the central control address manually from the remote controller. Operating mode priority change Note (1) NOTE (1) Explanation of operation mode priority change...
  • Page 119 2WAY VRF SYSTEM 1. Simple Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed, the operating modes of other remote controllers change as shown below. Mode change at priority remote controller Operating modes at other remote controllers Current mode New mode Current mode...

  • Page 120: Detailed Settings Function

    2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions • This allows the system address, indoor unit address, and other settings to be made for the individual or group-control indoor unit to which the remote controller used for detailed settings is connected.
  • Page 121 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions <Procedure of CZ-RTC4> 1. Press and hold the buttons simultaneously for 4 seconds or longer. 2. “ ”, unit No. “ ”, item code “ ”, and ° settings data “ ”...
  • Page 122 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description Concealed Duct-Medium 4-Way Cassette 36"×36" (U2) Static (F2) 0000 1-Way Cassette (D1) 0001 0005 Concealed Duct-Low 4-Way Cassette 24"×24" (Y2) Static (M2) Type Concealed Duct - High...
  • Page 123 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 Shifts discharge temperature setting 20°F down. –009 Shifts discharge temperature setting 18°F down. Cooling discharge –008 Shifts discharge temperature setting 16°F down.
  • Page 124 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description 0000 No forced operation 0001 Forced operation for 1 minute Automatic drain pump operation 0060 Continuous operation 0000 None Ventilation fan operation 0001 Ventilation fan operated by remote controller. Wired remote controller 0000 Not used.
  • Page 125 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Setting data Item code Item Description DC fan tap operating Purpose mode 0000 Standard Standard (setting at shipment) High ceiling use High ceiling setting 1 (with standard panel) 0001 For low Ultra long-life filter, oil guard panel, ammonia deodorizing static-pressure filter filter, optical regenerative deodorizing filter...
  • Page 126 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description Unit type Set when the indoor unit EEPROM memory is replaced during servicing. Indoor unit capacity System (outdoor unit) address These are not set at the time of shipping from the factory. Indoor unit address These must be set after installation if auto address setting is not performed.
  • Page 127 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Item code Item Description 1F (Upper limit) Cooling 20 (Lower limit) 21 (Upper limit) This setting changes the temperature range (upper limit and lower limit) Heating 22 (Lower limit) Change to the remote which is set from the remote controller or central control device.
  • Page 128 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions (Continued from previous page) Item code Item Description Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed. The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use.
  • Page 129 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions ExTERNAL STATIC PRESSURE SETTINg • Concealed Duct-Medium Static (S-07～54MF2U6) For concealed duct-medium static type indoor units, the ventilating resistance so-called “external static pressure” becomes greatly different depending on the connected duct length, shape, number of air outlet ports and types of filters.
  • Page 130 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions NOT E (1) Check the following items before performing the setting-check operations or auto airflow volume operations. 1) Check to make sure that the electrical wiring and ducting have been completed. Activate the stand-by mode. In particular, make sure that the closed damper located in the middle of the duct is open, if installed.
  • Page 131 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-2. Operating the High-spec Wired Remote Detailed settings 20:30 (THU) Controller (CZ-RTC5A) Unit no. Code no. Set data 0001 Sel. Next 20:30 (THU) 4. Select the “Set data” by pressing the button.
  • Page 132 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Auto External Static Pressure Setting Operation 9. Press the button. Test run will be started. Test run setting mode screen appears on the LCD 6. Keep pressing the display. buttons simultaneously for 4 or more seconds. The “Maintenance func”...
  • Page 133 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-3. Operating the Timer Remote Controller Table 2 Setting the external static pressure (CZ-RTC4) Indoor unit Item code 1-3-1. Setting Item Code “ ” 7, 9, 12, 15, 18, 24 36, 48, 54 Press and hold down the buttons...
  • Page 134 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions Indoor Fan Performance Item code “ ” M M M M M M M L L L L L L L L 1 -2 L L L L 1 -3 Type 7, 9, 12 and 15 Type 36 in.WC (Pa)
  • Page 135 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions • Concealed Duct-Low Static (S-07～18MM2U6) Choose one of the methods (selection of “a”, “b”, “c” within the range of dotted line as shown in the flowchart below) and make settings. a.
  • Page 136 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-4. How to Set on PC Board Table 3 External static pressure 1. Turn off the power breaker to halt the supply of Type electricity to the PC board. in.WC 0.04 0.06 0.06...
  • Page 137 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-5. Operating the High-spec Wired Remote Detailed settings 20:30 (THU) Controller (CZ-RTC5A) Unit no. Code no. Set data Sel. Next 20:30 (THU) 4. Select the “Set data” by pressing the button.
  • Page 138 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions 1-6. Operating the Timer Remote Controller Table 4 Setting the external static pressure (CZ-RTC4) Indoor unit Item code 1-6-1. Setting Item Code “ ” External static pressure of the rated air flow Press and hold down the buttons volume...
  • Page 139 2WAY VRF SYSTEM 2. Detailed Settings Function Remote Controller Functions External static pressure’s upper limit in high static pressure mode Standard external static Rated external static pressure pressure’s upper limit in high static pressure mode Lower static pressure in high static pressure mode Rated external static pressure at shipment...

  • Page 140: Remote Controller Servicing Functions

    2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions 2WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions • The remote controller includes a number of servicing functions. Use these as needed for test runs and inspections. <Function of CZ-RTC5A>...
  • Page 141 2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <CZ-RTC4> List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with forced Press and hold the button for Test run 4 seconds or longer. thermostat ON Sensor Press and hold the Temperature display...
  • Page 142 2WAY VRF SYSTEM 2WAY SYSTEM 3. Remote Controller Servicing Functions 3. Remote Controller Servicing Functions Remote Controller Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure of CZ-RTC5A> 1. Keep pressing the 20:30 (THU) buttons simultaneously for 4 or more seconds.
  • Page 143 2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> Operates the unit with the thermostat forced ON. 1. Press and hold the button for 4 seconds or longer. 2. “ ” appears on the remote controller LCD °...
  • Page 144 2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions n Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) Sensor info. 20:30 (THU) Unit no. Code no. Data The procedure below displays the sensor 0026 temperatures from the remote controller, indoor unit, 0028...
  • Page 145 2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions <Procedure of CZ-RTC4> 3, 4 Press and hold the buttons simultaneously for 4 seconds or longer. The unit No. “X-X” (main unit No.), item code “ ” (sensor address), and servicing monitor “ ”...
  • Page 146 2WAY VRF SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 Unit No.3 Room temp. controlled * Discharge temp. 1st compressor (DISCH1) Remote controller temp. Discharge temp. 2nd compressor (DISCH2) High-pressure sensor temp.
  • Page 147 2WAY VRF SYSTEM 2WAY SYSTEM Contents Contents Trouble Diagnosis Trouble Diagnosis 5. TROUBLE DIAGNOSIS 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.

  • Page 148: Trouble Diagnosis

    2WAY VRF SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Serial communi- Remote controller is detecting Indoor unit does not respond to remote controller. <E01>...
  • Page 149 2WAY VRF SYSTEM 1. Contents of Remote Controller Trouble Diagnosis Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor thermistor is either SCT thermistor at the suction refrigerant of compressors has open or damaged.

  • Page 150: Outdoor Unit Control Panel Led Display

    2WAY VRF SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and auto address setting is not in progress), no communication with the indoor units in that system is possible. (Both ON) After power is turned ON (and auto address setting is not in progress), one or more indoor units are confirmed in that system;...

  • Page 151: Way Alarm Codes

    2WAY VRF SYSTEM 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Trouble Diagnosis With types 72 and 96, only one INV compressor is supplied. With types 120 and 144, two INV compressors are supplied. Alarm code Alarm meaning Page Some indoor units does not respond to outdoor unit.
  • Page 152 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Alarm code Alarm meaning Page 1st compressor discharge temperature too high. 5-25 Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor 5-26 thermal protector (49C1 / 49C2). Open phase in power input is detected at HIC for 1st compressor. 5-27 Open phase in power input is detected at HIC for 2nd compressor.
  • Page 153 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Some indoor units does not respond to outdoor unit. Alarm conditions Some indoor units does not respond to outdoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed. (2) An open circuit or short-circuit occurred in the inter-unit control wiring after initial communications were completed.
  • Page 154 Example — Notes — E20 Alarm (U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9) Alarm code Alarm meaning No indoor unit responded in Auto Addressing. Alarm conditions When auto address setting was performed, no indoor units were recognized.
  • Page 155 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E20 Alarm (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) Alarm code Alarm meaning No indoor unit responded in Auto Addressing. Alarm conditions When auto address setting was performed, no indoor units were recognized. Probable cause (1) The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
  • Page 156 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis E25 Alarm Alarm code Alarm meaning The outdoor unit address is duplicating. Alarm conditions Communication by outdoor unit main-sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause The unit number is set incorrectly.
  • Page 157 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis F04, F05 Alarm Alarm code F04, F05 Alarm meaning F04 : DISCH1 thermistor at the discharge of 1st compressor reading is abnormal. F05 : DISCH2 thermistor at the discharge of 2nd compressor reading is abnormal. Alarm conditions (1) Discharge temp.
  • Page 158 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis Check (3) Leakage from the discharge tube check valve Trouble: Although the other compressor is operating and this compressor is stopped, the discharge temperature of this compressor rises together with the temperature of the other compressor.
  • Page 159 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis F08 Alarm Alarm code Alarm meaning TO thermistor for outdoor ambient air temperature has failure. (TO) Alarm conditions (1) Short circuit (A/D step is 10 steps or less.) (2) Open circuit (A/D step is 1014 steps or more.) Probable cause (1) Sensor malfunction (including connector) (2) The Outdoor Unit Control PCB malfunction...
  • Page 160 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High pressure sensor of the outdoor unit has failure. (HPS) Alarm conditions • High-pressure sensor disconnected or open circuit. • High-pressure sensor detected over 3.6MPa continuously for 30 minutes while outdoor units stopped. •...
  • Page 161 H11 : Overcurrent in 2nd compressor. Alarm conditions 1st compressor, 2nd compressor primary current detected overcurrent higher than the values (overcurrent) listed in the table below. Model name U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9 Current (A) 30.0 43.0 30.0 30.0 Model name...
  • Page 162 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H03, H13 Alarm (U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9) Alarm code H03, H13 Alarm meaning H03 : Current sensor for the 1st compressor is disconnected or shorted. H13 : Current sensor for the 2nd compressor is disconnected or shorted.
  • Page 163 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H05, H15 Alarm Alarm code H05, H15 Alarm meaning H05 : DISCH1 thermistor at the discharge of 1st compressor is disconnected, shorted or misplaced. (DISCH1) H15 : DISCH2 thermistor at the discharge of 2nd compressor is disconnected, shorted or misplaced. (DISCH2) Alarm conditions •...
  • Page 164 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Low pressure is too low. Alarm conditions • Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa for just a moment. Probable cause (1) Low-pressure sensor failure (2) Failure to open the service valve of the outdoor unit...
  • Page 165 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H07 Alarm Alarm code Alarm meaning Low on oil or the oil recovery circuit has restriction. Alarm conditions This alarm occurs when oil does not flow for a specified amount of time in tubing where oil flow constantly.
  • Page 166 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H08, H27 Alarm Alarm code H08, H27 Alarm meaning H08 : OIL1 thermistor for the oil of 1st compressor has failure. (OIL1) H27 : OIL2 thermistor for the oil of 2nd compressor has failure. (OIL2) Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for 1st compressor, and pins 4 and 5 for 2nd compressor) is open.
  • Page 167 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H21, H31 Alarm (U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9) Alarm code H21, H31 Alarm meaning H21 : HIC for 2nd compressor has failure. Overcurrent or overheat of HIC. H31 : HIC for 1st compressor has failure. Overcurrent or overheat of HIC.
  • Page 168 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis H21, H31 Alarm (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) Alarm code H21, H31 Alarm meaning H21 : HIC for 2nd compressor has failure. Overcurrent or overheat of HIC. H31 : HIC for 1st compressor has failure. Overcurrent or overheat of HIC. Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC.
  • Page 169 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis L10 Alarm Alarm code Alarm meaning Capacity setting of outdoor unit is not correct. Alarm conditions The outdoor unit capacity has not been set, or the setting is not allowed by the system. Probable cause This alarm occurs because the capacity has not been set.
  • Page 170 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis L17 Alarm Alarm code Alarm meaning Model mismatch between outdoor units in one refrigerant circuit. Alarm conditions This alarm occurs when a unit other than a R410A refrigerant model is connected. Probable cause (1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake.
  • Page 171 2WAY SYSTEM 2WAY VRF SYSTEM 4. 2WAY Alarm Codes Trouble Diagnosis 3. 2WAY Alarm Codes Trouble Diagnosis P03, P17 Alarm Alarm code P03, P17 Alarm meaning P03 : 1st compressor discharge temperature too high. P17 : 2nd compressor discharge temperature too high. Alarm conditions 1st compressor : Pre-trip stops when the temperature exceeds 223°F (106°C).
  • Page 172 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis P04 Alarm Alarm code Alarm meaning Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor thermal protector (49C1 / 49C2). Alarm conditions À The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure.
  • Page 173 When more than the current values shown in the table are instantly detected in the secondary current. HIC PCB Secondary current Model name U-72ME2U9 U-96ME2U9 U-120ME2U9 U-144ME2U9 Current (A) 30.0 44.0 30.0 30.0 Model name U-72ME2U94 U-96ME2U94 U-120ME2U94 U-144ME2U94...
  • Page 174 — Example — Notes — P22 Alarm (U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9) Alarm code Alarm meaning Fan motor or inverter drive of outdoor unit has failure. Alarm conditions Fan motor start failure, fan motor Hall IC input failure Probable cause Possible causes are a Hall IC input circuit failure and a Fan PCB failure.
  • Page 175 2WAY VRF SYSTEM 3. 2WAY Alarm Codes Trouble Diagnosis P22 Alarm (U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94) Alarm code Alarm meaning Fan motor or inverter drive of outdoor unit has failure. Alarm conditions Fan motor start failure, fan motor Hall IC input failure Probable cause Possible causes are a Hall IC input circuit failure and a Fan PCB failure.

  • Page 176: Blinking Inspection Display On The Remote Controller

    WARNING 2WAY VRF SYSTEM 4. Blinking Inspection Display Trouble Diagnosis on the Remote Controller Currently the blinking inspection display can be displayed only on the wired remote controller CAUTION and system remote controller. Blinking inspection display (Automatic backup) Alarm code (Blinking inspection display) Alarm meaning Automatic backup is in progress.

  • Page 177: Inspection And Characteristics Of Parts

    5. Inspection and Characteristics of Parts Trouble Diagnosis (1) High-Pressure Switch (63PH1, 63PH2) U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 63PH1 Disconnect the CN3 connector (3P, white) from the Outdoor Unit Control PCB. Measure the resistance between socket pins 1 and 3.
  • Page 178 2WAY VRF SYSTEM 2WAY VRF SYSTEM 5. Inspection and Characteristics of Parts 8. Thermister Characteristics Curve Trouble Diagnosis Trouble Diagnosis (4) Characteristics of Thermistor (Indoor Unit) Intake temperature thermistor (TA) ● Temperature (˚F) ● Indoor unit heat exchanger thermistor (E1, E3) Temperature (˚F) Temperature (˚F) 5 - 32...
  • Page 179 (5) Coil Resistance of Outdoor Unit Fan Motor unit : ohm Model name Resistance (at 68°F) U - V U - W V - W U-72ME2U9 U-96ME2U9 DMSBJ75SY U-120ME2U9 U-144ME2U9 U-72ME2U94 U-96ME2U94 DMSBG75SY U-120ME2U94 U-144ME2U94 (6) Coil Resistance of Compressor Motor unit : ohm 1st compressor...
  • Page 180 C-9RVN393HOM C-9RVN393HOM 2WAY VRF SYSTEM 0.246 0.246 0.246 0.246 0.246 0.246 5. Inspection and Characteristics of Parts Trouble Diagnosis C-9RVN393HOM C-9RVN393HOM 0.246 0.246 0.246 0.246 0.246 0.246 (7) Characteristics of Thermistor (Outdoor Unit) Ambient air temperature thermistor (TO) ● Suction temperature thermistor (SCT) ●...

  • Page 181: Test Pin

    2WAY VRF SYSTEM 6. Test Pin Trouble Diagnosis When the TEST pin on the Outdoor Unit Control PCB is short-circuited, each part can be operated individually. • After turning OFF the main unit power, short-circuit the TEST pin (CN22), then turn the power ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each. Output Operation Relay RY12...

  • Page 182: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently

    Mini VRF SYSTEM 6. Symptom: Thermostat in OFF continues or Trouble Diagnosis 2WAY VRF SYSTEM 7. Symptom: Thermostat in OFF continues or cycles OFF & ON too frequently Trouble Diagnosis cycles OFF & ON too frequently How to detect abnormality •...

  • Page 183: Test Run

    2WAY VRF SYSTEM Contents Test Run 6. TEST RUN 1. Preparing for Test Run ..........6-2 2.

  • Page 184: Preparing For Test Run

    2WAY VRF SYSTEM 1. Preparing for Test Run Test Run 1. Preparing for Test Run (7) Request that the customer be present for the trial run. Explain the contents of the instruction manual, then have Before attempting to start the air conditioner, check the the customer actually operate the system.

  • Page 185: Test Run Procedure

    2WAY VRF SYSTEM 2. Test Run Procedure Test Run 7-2. Test Run Procedure 2. Test Run Procedure Notes: Recheck before the test run. 1. Use caution when making the settings. If there are duplicated system addresses, or if the settings for the number of indoor units are not Have outdoor sub units been connected? consistent, an alarm will occur and the system will not start.

  • Page 186: Main Outdoor Unit Pcb Setting

    CN28 CN30 CN40 COOL HEAT MODE NO. OF I / U R. C. ADD O/U. ADD NO. OF O/U SHORT OPEN CN67 U-120ME2U9 / U-144ME2U9 CN28 CN24 CN73 CN27 CN23 CN30 Terminating resistance pin CN40 MODE A. ADD COOL HEAT...
  • Page 187 2WAY VRF SYSTEM 3. Main Outdoor Unit PCB Setting Test Run U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Terminating resistance pin CN73 LED1 LED2 CN34 CN33 JP11 CN25 JP12 CN24 CN23 CN69 CN40 CN30 CN28 CN27 CN82 6 - 5...
  • Page 188 2WAY VRF SYSTEM 3. Main Outdoor Unit PCB Setting Test Run l <Sample> Outdoor unit number setting (SW5) Unit number setting (SW5) Unit number setting Notes: (3P Dip switch, black) (1) Unit 1 (outdoor main unit) needs to prepare the settings Unit 1 (at shipment) 1: ON of “number of outdoor units”, “number of indoor units”...

  • Page 189: Function Switches On P.c. Board

    2WAY VRF SYSTEM 4. Function Switches on P.C. Board Test Run 4. Function Switches on P.C. Board U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 U-72ME2U9 / U-96ME2U9 / U-120ME2U9 / U-144ME2U9 Function Switch Remarks Changes to cooling/heating mode. (outdoor main unit is only usable.)
  • Page 190 2WAY VRF SYSTEM 4. Function Switches on P.C. Board Test Run U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 U-72ME2U94 / U-96ME2U94 / U-120ME2U94 / U-144ME2U94 Function Switch Remarks Changes to cooling/heating mode. (Outdoor main unit is only usable.) When in normal operation: When short circuited the COOL side, indoor unit operation in the same refrigerant system changes to all cooling mode.

  • Page 191: Auto Address Setting

    2WAY VRF SYSTEM 5. Auto Address Setting Test Run 5. Auto Address Setting 7-5. Auto Address Setting Example: Basic Wiring Diagram (1) • Case of no link wiring 3P terminating (Inter-unit control wiring is not connected to a multiple system.) resistance pin Indoor unit address setting is possible without starting the compressor.
  • Page 192 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Example: Basic Wiring Diagram (2) Setting of terminating resistance pin (CN67) Refrigerant circuit No. 1 • Case of link wiring Unit No. 1 (Main) : short-circuit (at shipment) * See the section “ATTENTION!”. Unit No.
  • Page 193 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Between conductors inal check before operation Wire Final check must be done under the conditions of inter-outdoor unit control wiring connected to the centralized control system and the resistor between conductors must be measured by a Megger.
  • Page 194 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Case 3.a (Auto address setting in heating mode) l In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: Indoor unit auto address setting cannot be made unless the compressor is started. How to control automatic address from outdoor unit 1.
  • Page 195 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Case 3.b (Auto address setting in cooling mode) l In case of impossibility of turning ON power to indoor/outdoor units in each refrigerant system: The indoor unit auto address setting cannot be made unless the compressor is started. How to control automatic address from outdoor unit 1.
  • Page 196 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Auto Address Setting from the High-spec Wired Remote Controller (CZ-RTC5A) Keep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD 20:30 (THU) display. Press the button to see each menu.
  • Page 197 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Display During Auto Address Setting On the surface of outdoor unit control P.C. board * Do not short circuit the A.ADD pin (CN30) again during auto address setting. LEDs 1 and 2 go out and address setting is interrupted. * When auto address setting is normally completed, both LEDs 1 and 2 go out.
  • Page 198 2WAY VRF SYSTEM 5. Auto Address Setting Test Run Checking the indoor unit addresses Use the remote controller to check the indoor unit address. CZ-RTC5A (High-spec wired remote controller) Keep pressing the buttons “Simple settings” screen appears on the LCD simultaneously for 4 or more seconds.

  • Page 199: Setting Test Run Remote Controller

    2WAY VRF SYSTEM 6. Setting Test Run Remote Controller Test Run 6. Setting Test Run Remote Controller CZ-RTC5A (High-spec wired remote controller) 20:30 (THU) eep pressing the buttons simultaneously for 4 or more seconds. The “Maintenance func” screen appears on the LCD display.

  • Page 200: Caution For Pump Down

    7. Caution for Pump Down 2WAY VRF SYSTEM Test Run 8. Self-Diagnosis Function Table and Contents of Alarm Display 7. Caution for Pump Down Pump down means refrigerant gas in the system is returned to the outdoor unit. Pump down is used when the unit is to be moved, or before servicing the refrigerant circuit. See the section 2.
  • Page 201 2WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display • If the alarm display “E15”, “E16” and “E20” appear after auto address setting began, check the following items. Alarm display Alarm contents Recognized number of indoor units at the time of auto address setting are fewer than that of indoor units set by SW3 and SW4 on outdoor main unit P.C.
  • Page 202 2WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Remote control display Alarm contents Two or more remote controllers are set as main on R1-R2 link. Auto Address failed to start. Two or more indoor units are set as main, in the group controlled indoor units. Fewer indoor units are found in Auto Addressing than the setting on outdoor PCB.
  • Page 203 2WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Remote control display Alarm contents Protection device activated. High pressure switch (63PH, 63PH1 or 63PH2) or compressor thermal protector (49C1 / 49C2). Missing phase in power input is detected at HIC for 1st compressor. Connection to the panel of indoor unit is not good.
  • Page 204 2WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Wired remote Detected contents control display Indoor thermistor is either open or damaged. <<F01>> E1 thermistor on liquid side of indoor heat exchanger has failure. (E1) Indoor unit set as single split.
  • Page 205 2WAY VRF SYSTEM 8. Self-Diagnosis Function Table and Test Run Contents of Alarm Display Wired remote Detected contents control display Abnormal device function HIC for 2nd compressor has failure. Overcurrent or overheat of HIC. HIC for 1st compressor has failure. Overcurrent or overheat of HIC. •...
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