Panasonic U-10MF1E8 Service Manual
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Panasonic U-10MF1E8 Service Manual

3-way system
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SERVICE MANUAL
Model No.
Outdoor Unit
Class
8HP
MF1
Model Name
U-8MF1E8
Indoor Unit
Class
22
U1
4-Way Cassette
S-22MU1E5
Y1
4-Way Cassette 60×60
S-22MY1E5
L1
2-Way Cassette
S-22ML1E5
D1
1-Way Cassette
S-22MF1E5
Low Silhouette Ducted
F1
M1
Slim Low Static Ducted
S-22MM1E5
T1
Ceiling
K1
Wall Mounted
S-22MK1E5
Concealed Floor
R1
S-22MR1E5
Standing
P1
Floor Standing
S-22MP1E5
Class
73
High Static Pressure
E1
S-73ME1E5
Ducted
85464849288001
10HP
12HP
U-10MF1E8
U-12MF1E8
28
36
45
S-28MU1E5
S-36MU1E5
S-45MU1E5
S-28MY1E5
S-36MY1E5
S-45MY1E5
S-28ML1E5
S-36ML1E5
S-45ML1E5
S-28MD1E5
S-36MD1E5
S-45MD1E5
S-28MF1E5
S-36MF1E5
S-45MF1E5
S-28MM1E5
S-36MM1E5
S-45MM1E5
S-36MT1E5
S-45MT1E5
S-28MK1E5
S-36MK1E5
S-45MK1E5
S-28MR1E5
S-36MR1E5
S-45MR1E5
S-28MP1E5
S-36MP1E5
S-45MP1E5
106
140
224
S-106ME1E5
S-140ME1E5
S-224ME1E5
14HP
16HP
U-14MF1E8
U-16MF1E8
56
73
S-56MU1E5
S-73MU1E5
S-56MY1E5
S-73ML1E5
S-56ML1E5
S-56MD1E5
S-73MD1E5
S-56MF1E5
S-73MF1E5
S-56MM1E5
S-56MT1E5
S-73MT1E5
S-56MK1E5
S-73MK1E5
S-56MR1E5
S-71MR1E5
S-56MP1E5
S-71MP1E5
280
S-280ME1E5
90
106
140
S-106MU1E5
S-140MU1E5
S-90MF1E5
S-106MF1E5
S-140MF1E5
S-106MT1E5
S-140MT1E5
S-106MK1E5
SM830188-01
REFERENCE NO.
160
S-160MU1E5
S-160MF1E5

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  • Page 1 SERVICE MANUAL Model No. Outdoor Unit Class 10HP 12HP 14HP 16HP Model Name U-8MF1E8 U-10MF1E8 U-12MF1E8 U-14MF1E8 U-16MF1E8 Indoor Unit Class 4-Way Cassette S-22MU1E5 S-28MU1E5 S-36MU1E5 S-45MU1E5 S-56MU1E5 S-73MU1E5 S-106MU1E5 S-140MU1E5 S-160MU1E5 4-Way Cassette 60×60 S-22MY1E5 S-28MY1E5 S-36MY1E5 S-45MY1E5 S-56MY1E5...
  • Page 2 • Provide a power outlet to be used exclusively for each each model as shown in the table below. unit, and a power supply disconnect, circuit breaker and earth leakage breaker for overcurrent protection should U-8MF1E8 U-10MF1E8 U-12MF1E8 U-14MF1E8 U-16MF1E8 be provided in the exclusive line. Ssc 3840kW 4710kW...
  • Page 3 When Connecting Refrigerant Tubing Others • When performing piping work do • Do not touch the air inlet or CAUTION not mix air except for specifIed the sharp aluminum fins of the refrigerant (R410A) in refrigeration outdoor unit. You may hurt. cycle.
  • Page 4 Check of Density Limit The standards for minimum room volume are as follows. (1) No partition (shaded portion) The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the air conditioner, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.

  • Page 5: Table Of Contents

    — CONTENTS — Section 1: CONTROL FUNCTIONS ......... . 1-1 Introduction .
  • Page 6 Section 5. TROUBLE DIAGNOSIS ......... . 5-1 Contents of Remote Controller Switch Alarm Display .

  • Page 7: Control Functions

    3-WAY SYSTEM Control Functions 1. CONTROL FUNCTIONS 1. Introduction ............1-2 2.

  • Page 8: Introduction

    3-WAY SYSTEM 1. Introduction Control Functions The 3-WAY System is a system that allows multiple outdoor units to be connected. The outdoor units all contain inverter compressors, and the system does not utilize the sub units that were used in earlier systems. The outdoor unit where the unit No.

  • Page 9: Selecting Outdoor Unit For Operation

    3-WAY SYSTEM 2. Selecting Outdoor Unit for Operation Control Functions 2-1. Outdoor Unit Operating Rules Because in this system all outdoor units contain an inverter compressor, ordinarily there is no absolute order of priority for compressor operation. Therefore there is no order of priority for the outdoor units. However, it is possible to operate the outdoor units in sequence, beginning with unit No.

  • Page 10: Compressor Control

    3-WAY SYSTEM 3. Compressor Control Control Functions 3-1. Compressors Mounted in the Outdoor Units [U-8MF1E8, U-10MF1E8, U-12MF1E8, U-14MF1E8, U-16MF1E8] Capacity 8 hp 10 hp 12 hp 14 hp 16 hp Compressor 1 Rotary DC Inverter DC Inverter DC Inverter DC Inverter...
  • Page 11 3-WAY SYSTEM 3. Compressor Control Control Functions 3-3. Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and on the effects of indoor heat load, outside temperature, and other factors. Unit No. 1 (CCU) calculates the required capacity according to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules.
  • Page 12 3-WAY SYSTEM 3. Compressor Control Control Functions 3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode 16.0 Horsepower increase 12.0 Area A permitted 11.1 11.0 11.0 Horsepower increase permitted Area AB Horsepower increase Area B prohibited Horsepower decrease Area C Maximum requirement level [L]...
  • Page 13 3-WAY SYSTEM 3. Compressor Control Control Functions 3-6-2. Condensation Temperature (Tc) Control: Control when there are indoor units operating in Heating mode PX=55.5°C Thermostat OFF Area D –0.1 Horsepower decrease Area C 51.1 51.0 51.0 Horsepower increase Area B prohibited 48.0 48.0 47.9...
  • Page 14 3-WAY SYSTEM 3. Compressor Control Control Functions Compressor Control Table Condensation Temp. [Tc] High not_UP slow_UP Target STOP DOWN not_UP Evaporation temperature (Te) and condensation temperature (Tc) areas A, B, C, and D are the same as for evaporation temperature control and condensation temperature control. (2) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as a condenser) •...
  • Page 15 3-WAY SYSTEM 3. Compressor Control Control Functions (3) Increasing/decreasing the heat exchanger capacity (when the outdoor unit heat exchanger is functioning as an evaporator) • Primarily when both the evaporation temperature (Te) and condensation temperature (Tc) are low This occurs when the cooling capacity (heat intake) is high and the heating capacity (heat discharge) is low. The outdoor heat exchanger capacity is increased, increasing the system evaporation capacity and raising the evaporation temperature (Te).
  • Page 16 3-WAY SYSTEM 3. Compressor Control Control Functions (2) Current protection Inverter compressor current control is composed of primary current control and secondary current control. Current protection control for the inverter compressor is performed by self-protection in the inverter circuit, and does not increase or decrease the compressor capacity.

  • Page 17: Special Controls

    3-WAY SYSTEM 4. Special Controls Control Functions In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special controls for control of the system as a whole. 1. Tube refrigerant recovery control 2. System refrigerant oil recovery control 3.
  • Page 18 3-WAY SYSTEM 4. Special Controls Control Functions 4-2-3. Flow of system refrigerant oil recovery control (1) Simplified flow of system refrigerant oil recovery control System refrigerant oil recovery control follows this flow: Normal operation 3-minute stop (May stop for 6 minutes.) System refrigerant oil recovery control (Max.
  • Page 19 3-WAY SYSTEM 4. Special Controls Control Functions 4-3-4. Outdoor units where defrost occurs Even if the total time has not reached 35 minutes, if there is 1 or more outdoor units that fulfills the defrost detection conditions, all operating outdoor units perform defrost control at the same time. * Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as an evaporator (such as stopped outdoor units).
  • Page 20 3-WAY SYSTEM 4. Special Controls Control Functions 4-3-6. Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 or more outdoor units are connected to the refrigerant system. (1) Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a condenser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode.
  • Page 21 3-WAY SYSTEM 4. Special Controls Control Functions 4-3-7. Defrost end judgment conditions Defrost ends when either of the below defrost end judgment conditions is met. Condition 1: The temperatures are 6°C or higher at all temperatures sensors installed on the outdoor unit heat exchangers.

  • Page 22: Other Controls

    3-WAY SYSTEM 5. Other Controls Control Functions 5-1. Oil Control 5-1-1. Oil level Oil level Meaning Oil state Assessment Suffi cient There is more than an adequate amount of oil in This is the normal operating state of the compressor. the system and not a problem.

  • Page 23: Operation Of Solenoid Valves

    3-WAY SYSTEM 6. Operation of Solenoid Valves Control Functions 6-1. Refrigerant Control Valve [RCV] The main purpose of this valve is to detect the flow of refrigerant (refrigerant volume) on the indoor-unit side when the outdoor unit heat exchanger is functioning as a condenser. When the valve determines that there are signs of a low refrigerant level, refrigerant is supplied from the receiver tank to the system.
  • Page 24 3-WAY SYSTEM 6. Operation of Solenoid Valves Control Functions 6-3. Balance Valve (BALV) This valve moves some of the oil from the oil separator to the balance tube. (1) When unit is stopped This valve is always OFF. (2) When unit is operating (A) This valve is ON when separator oil self-recovery control is in progress.

  • Page 25: Outdoor Unit Electronic Control Valves [Mov1, Mov2, Mov3, Mov4]

    3-WAY SYSTEM 7. Outdoor Unit Electronic Control Valves Control Functions [MOV1, MOV2, MOV3, MOV4] 7-1. Types of Electronic Control Valves [U-8MF1E8, U-10MF1E8, U-12MF1E8, U-14MF1E8, U-16MF1E8] Capacity 8 hp 10 hp 12 hp 14 hp 16 hp Electronic Heat exchanger Heat exchanger...
  • Page 26 3-WAY SYSTEM 7. Outdoor Unit Electronic Control Valves Control Functions [MOV1, MOV2, MOV3, MOV4] 7-4. SC Circuit Electronic Control Valve [MOV4] (1) Operation to increase SC During cooling operation, or mixed heating/cooling operation when the outdoor unit heat exchanger is functioning as a condenser, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cool = supercooling) approaches 0°C.

  • Page 27: Outdoor Fan Control

    3-WAY SYSTEM 8. Outdoor Fan Control Control Functions 8-1. Fan mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 16 steps (16 modes). However, fan modes 15 and 16 can only be used if high static-pressure mode has been set. * For information concerning EEPROM settings, refer to the field application functions.

  • Page 28: Demand Control

    3-WAY SYSTEM 9. Demand Control Control Functions Serial-parallel I/O must be connected in order to perform demand control. The below input is received by serial-parallel I/O, and demand control is performed. The demand values can be set as needed with this device. For more information, refer to the field application functions.

  • Page 29: Indoor Unit Control Of The Electronic Control Valve

    3-WAY SYSTEM 10. Indoor Unit Control of the Electronic Control Valve Control Functions 10-1. Normal Control (1) Except Type E1 Position of electronic control valve Remote Outdoor unit Mode Outdoor unit operation Controller stopped Cooling Thermostat ON Performs SH control in the range of 55 - 480 pulses. *1 Thermostat OFF 20 pulses 20 pulses...
  • Page 30 3-WAY SYSTEM 10. Indoor Unit Control of the Electronic Control Valve Control Functions 10-2. Special Control Outdoor Subject indoor units heat Control Position of electronic control valve exchanger Remote Mode mode Controller Condenser All indoor units Fixed pulse for cooling, according to indoor unit capacity Tube refrigerant oil recovery control Evaporator...

  • Page 31: Solenoid Valve Kit Control

    3-WAY SYSTEM 11. Solenoid Valve Kit Control Control Functions This device connects the solenoid valve kit which is used to switch between indoor unit cooling/heating for 3-WAY types. 1. Operation of the except type E1 solenoid valve kit Remote Discharge Intake Balance EP valve (evaporation...

  • Page 32: Indoor Special Control

    3-WAY SYSTEM 12. Indoor Special Control Control Functions 12-1. Switching Control (EC control) If the settings indicate that an RAP valve kit is present (for type E1, the setting on initial shipment from the factory is “present”), then the thermostat does not turn ON for 3 minutes after the indoor unit operating mode is changed from any mode other than heating (including stopped) to heating with thermostat ON.

  • Page 33: Discharge Temperature

    3-WAY SYSTEM 13. Discharge Temperature Control Functions <Alarm Information> (1) Discharge temperature protection alarm This device sets an upper limit discharge temperature of 105°C for all compressors. When the discharge tem- perature reaches 105°C, that compressor is stopped and restarted. If the same high discharge condition occurs 4 times, then an alarm occurs.

  • Page 34: Current Protection

    3-WAY SYSTEM 14. Current Protection Control Functions (1) Fan motor Alarm Description Occurs when the fan motor detects overcurrent, or when the motor is locked and does not turn. (2) Inverter compressor Alarm Description Occurs during ordinary operation when overcurrent (32.5 A) is detected. Occurs under the same conditions as P16 when the inverter compressor is operating at or above 80 Hz.

  • Page 35: Low Oil Alarm

    3-WAY SYSTEM 15. Low Oil Alarm Control Functions Ordinary operation is resumed after system oil recovery control is completed. If a stop occurs again as a result of a low oil level, this alarm occurs. This alarm will not occur if system oil recovery control has not already been performed.

  • Page 36: Pressure Sensor Failure

    3-WAY SYSTEM 16. Pressure Sensor Failure Control Functions This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor. (1) High-pressure sensor failure Identification of a failure caused by a loose or displaced connector is based on the relationship between the pres- sure detected by the high-pressure sensor and the operation of the high-pressure switch, and on the relationship between the temperature detected by the high-pressure sensor and the various temperature thermistors.

  • Page 37: Backup Operation

    3-WAY SYSTEM 17. Backup Operation Control Functions <Field Application Functions> 17-1. Automatic Backup Operation This system includes a function for automatic backup operation. An alarm is also displayed to inform the operator that a failure has occurred. (1) Alarms that result in automatic backup operation When compressor trouble or fan motor trouble makes emergency continued operation impossible, automatic backup operation mode is engaged.
  • Page 38 3-WAY SYSTEM 17. Backup Operation Control Functions [2] Disabling operation of 1 compressor At the S010 switch on the PCB of the failed outdoor unit, turn ON the switch for the compressor to disable, and turn ON the “backup” switch. <S010 switch>...

  • Page 39: Service Maintenance Functions

    3-WAY SYSTEM 18. Service Maintenance Functions Control Functions The outdoor unit EEPROM settings can be used for the following functions. 18-1. Outdoor Unit Noise Countermeasure: EEPROM 05 (set at each outdoor unit) This unit includes 3 types of Quiet modes. (However, when they are engaged, operation is in Quiet mode 24 hours a day.) Selecting a Quiet mode results in operation that gives priority to reducing noise.
  • Page 40 3-WAY SYSTEM 18. Service Maintenance Functions Control Functions 18-5. Automatic Backup Mode: Outdoor EEPROM 49 (set only on outdoor unit No. 1) Two types of automatic backup modes (when multiple outdoor units are installed) can be selected. Setting Operation Condition Backup outdoor units operate only during special control.
  • Page 41 3-WAY SYSTEM 18. Service Maintenance Functions Control Functions 18-9. Compressor operating sequence: Outdoor EEPROM 49 (set at outdoor units which include CCU functions) When this setting is set to “1,” the compressors start in sequence beginning from the No. 1 outdoor unit. (The setting is “0”...

  • Page 42: Other Functions

    3-WAY SYSTEM 19. Other Functions Control Functions 19-1. Snowfall Sensor Functions: Outdoor EEPROM 04 A unit identified as having a snowfall sensor attached will periodically send a signal indicating the snowfall sensor input status to all outdoor units in the same system (or all wired outdoor units in the case of linked systems). It is therefore unnecessary to install and wire multiple snowfall sensors.
  • Page 43 3-WAY SYSTEM 19. Other Functions Control Functions (3) Outdoor unit PCB LED indications in judgment mode LED1 LED2 Recommended response Judgment mode Blinking Blinking Normal Insuffi cient gas Blinking Charge with refrigerant a little at a time. Overcharge Blinking Recover refrigerant a little at a time. Judgment not Blinking possible...
  • Page 44 – MEMO – 1 - 38...

  • Page 45: Outdoor Unit Repair Procedures

    3-WAY SYSTEM Outdoor Unit Repair Procedures 2. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............2-2 2.

  • Page 46: Removing Panels

    3-WAY SYSTEM 1. Removing Panels Outdoor Unit Repair Procedures Procedures: 1. Removing Panels 2. Removing Electrical Component Box and Duct 3. Discharging Compressor Oil 4. Backup Operation 5. Recovering Refrigerant 6. Checking for Leakage After Repair 7. Evacuating System 8. Charging Compressor Oil 9.

  • Page 47: Removing Electrical Component Box And Duct

    3-WAY SYSTEM 2. Removing Electrical Component Box and Duct Outdoor Unit Repair Procedures Be sure to turn off the power before removing the electrical component box. Then check that the power LED (D53) on the control PCB of the outdoor unit is not lit. (1) Remove the electrical component box cover (remove 6 screws).
  • Page 48 3-WAY SYSTEM 2. Removing Electrical Component Box and Duct Outdoor Unit Repair Procedures (7) Remove the lower duct. (2 screws, 1 tab) (Fig. 5-1) Lower duct Fig. 5-1 (8) Remove the upper duct. (3 screws) (Fig. 5-2) Upper duct Fig. 5-2 2 - 4...

  • Page 49: Discharging Compressor Oil

    3-WAY SYSTEM 3. Discharging Compressor Oil Outdoor Unit Repair Procedures Discharged oil can be used for checking the condition of the system. Based on the appearance and color of the discharged oil, a judgment can be made on whether the system is operating normally or not. 3-1.

  • Page 50: Backup Operation

    3-WAY SYSTEM 4. Backup Operation Outdoor Unit Repair Procedures This system includes an emergency automatic backup function that allows the A/C to operate during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation.
  • Page 51 3-WAY SYSTEM 4. Backup Operation Outdoor Unit Repair Procedures <If the failed unit is the No. 1 outdoor unit (main unit)> If the No. 1 unit (main unit) has failed, a different outdoor unit must be set as the No. 1 unit (main unit). •...
  • Page 52 3-WAY SYSTEM 4. Backup Operation Outdoor Unit Repair Procedures • After adjusting the amount of refrigerant, turn OFF the power at the failed outdoor unit, release the short-circuit at the vacuum application pin, and close the liquid tube valve at the failed outdoor unit. * Refrigerant recovery is not affected by the power status of the failed outdoor unit.

  • Page 53: Recovering Refrigerant

    3-WAY SYSTEM 5. 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 54 3-WAY SYSTEM 5. Recovering Refrigerant Outdoor Unit Repair Procedures 5-2. Refrigerant Recovery Procedures (Indoor Unit) The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit. START 5-2-1.
  • Page 55 3-WAY SYSTEM 5. Recovering Refrigerant Outdoor Unit Repair Procedures (2) If the remote controller (CZ-RTC2) is not available for maintenance of the outdoor unit ➀ Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (BLU) on the outdoor unit control PCB is set to No.
  • Page 56 3-WAY SYSTEM 5. Recovering Refrigerant Outdoor Unit Repair Procedures 5-2-3. Refrigerant recovery procedures (2): for indoor unit with no ball valve 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 57 3-WAY SYSTEM 5. Recovering Refrigerant Outdoor Unit Repair Procedures Discharge tube service port (For 7.94mm-dia. connector) Liquid tube service port (For 7.94mm-dia. connector) Manifold gauge Refrigerant recover unit Refrigerant Suction tube service port recovery cylinder (For 7.94mm-dia. connector) Fig. 9 5-3.

  • Page 58: Checking For Leakage After Repair

    3-WAY SYSTEM 6. Checking for Leakage After Repair Outdoor Unit Repair Procedures 6-1. 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 suction tube, discharge tube, liquid tube, and balance tube in the repaired outdoor unit are fully closed.

  • Page 59: Evacuating System

    3-WAY SYSTEM 7. 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. 7-1. Evacuating Repaired Outdoor Unit (1) Check that each service valve of the suction tube, discharge tube, liquid tube, and balance tube in the outdoor unit are fully closed.

  • Page 60: Charging Compressor Oil

    3-WAY SYSTEM 8. Charging Compressor Oil Outdoor Unit Repair Procedures 8-1. 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. The oil charging procedures are given below.
  • Page 61 3-WAY SYSTEM 8. 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 container. Make sure you avoid letting any air be sucked into the tube. Next, run the vacuum pump and open the manifold gauge valves, then open the upper and lower valves to begin charging oil into the charging tank.
  • Page 62 3-WAY SYSTEM 8. Charging Compressor Oil Outdoor Unit Repair Procedures Next follow the instructions in “5-2-1. Cooling operation (for all units)” at the outdoor unit where oil will be charged, and start cooling operation at all units. When the operating conditions have stabilized, perform steps 1, 2, and 3 in sequence and open the valves.
  • Page 63 The rated amount of oil is pre-charged in the compressors as given below: Model name Compressor model Q’ty Pre-charged amount of oil (liters) C-9RVN273H0U U-8MF1E8 (Inverter-controlled rotary compressor) JT160G-KTYE@SB (Constant-speed scroll compressor) C-9RVN273H0U U-10MF1E8 (Inverter-controlled rotary compressor) JT170G-KTYE@SB (Constant-speed scroll compressor) C-9RVN273H0U U-12MF1E8 (Inverter-controlled rotary compressor) JT170G-KTYE@SB (Constant-speed scroll compressor) C-9RVN273H0U U-14MF1E8...

  • Page 64: Pumping Out Refrigerant From Outdoor Unit

    3-WAY SYSTEM 9. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flat-head screwdriver, and outdoor unit maintenance remote controller. This work is performed in order to collect the refrigerant from an outdoor unit where repairs (other than compressor replacement) will be performed into other outdoor units and indoor units, and the refrigerant tubing.
  • Page 65 3-WAY SYSTEM 9. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (9) Short-circuit the vacuum application pin on the outdoor unit control PCB of the unit to be repaired. Then turn ON the outdoor unit power. When the vacuum application pin is short-circuited and the power is turned ON, all CAUTION solenoid valves in the outdoor unit are forced open, allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves.
  • Page 66 3-WAY SYSTEM 9. Pumping Out Refrigerant from Outdoor Unit Outdoor Unit Repair Procedures (10) When the low pressure at the outdoor unit to be repaired reaches 0.5 MPa or below, pull out the SCT connector (2P) (YEL) (CN231) from the outdoor unit control PCB of that outdoor unit. Then immediately fully close the discharge tube valve on that outdoor unit.

  • Page 67: Compressor

    3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-1. 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) →...
  • Page 68 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-2. Replacing the Compressor(s) 10-2-1. Replacing only the failed compressor If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation. Follow the instructions in “10-3. Removing and Installing Compressors” and replace the failed compressor. Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
  • Page 69 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-2-2. Replacing all compressors in a failed unit Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separator in the failed unit. Measure the amount of drained oil. If backup operation is required, follow the instructions in “4.
  • Page 70 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-2-3. Replacing all compressors in a system Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separators in all outdoor units. Measure the amount of drained oil. Follow the instructions in “10-3.
  • Page 71 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-2-4. 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. If, when the oil is inspected, there is an outdoor unit where the oil color phase is 4.0 or higher, or where a sharp odor is present, carry out all steps below to perform dry core cleaning.
  • Page 72 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures (16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were removed until the pressure is –101kPa (5 Torr) or less. (17) INSTALLATION: Refer to the “Information for the Person in Charge of Installation” items. Charge with an amount of refrigerant equal to the amount that was recovered.
  • Page 73 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures 10-3. Removing and Installing Compressors When removing and installing compressors, use sufficient caution to ensure that moisture or other substances do not enter the refrigerant tubing system. 10-3-1. Replacing compressors * For all models U-8MF1E8 – U-16MF1E8, follow the replacement procedure below. (A) Replacing the inverter compressor (Compressor 1 on remote controller alarm display) Removal (1) Connect a manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compresso...
  • Page 74 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures Installation Remove the rubber stopper and tube cap (brazed) from the new compressor. Install the crankcase heater onto the new compressor. Place the 2 pieces of cushioning rubber in the designated positions on the compressor. Place the 2 pieces of cushioning rubber onto the legs of the new compressor.
  • Page 75 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures (B) Replacing the constant-speed compressor 1 (Compressor 2 on remote controller alarm display) Removal Connect the manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compres- sor will be replaced.
  • Page 76 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures Installation Remove the 2 brazed tube caps (2 pieces) from the compressor. Remove hexagonal caps from the compressor. When removing the hexagonal caps, hold the fixing nut at the main unit side so as not to loose it with a wrench or spanner.
  • Page 77 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures Brazing locations (3) Bolt Washer: Rubber washer: 1 (1 each at the 3 locations) Protect the oil equalizer tube connectors Cushioning rubber guide Front view Fig. 26 Set the remaining cushioning rubber beneath the new compressor leg at the locations shown in the figure 26. Remove the bolts which are temporarily fastening the 2 pieces of cushioning rubber, and anchor the 3 com- pressor legs using the bolts, washers, and rubber washers.
  • Page 78 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures (C) Replacing constant-speed compressor 2 (Compressor 3 on the remote controller alarm display) Removal Connect the manifold gauge to the high- and low-pressure outlet ports at the outdoor unit where the compressor will be replaced.
  • Page 79 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures Installation (1) Remove the capillary tube assembly from the removed compressor at the brazed location shown in the figure 28. At this time, remove the thermal insulation and sensor before disconnecting the tube. Protect the oil equalizer tubing, rubber, clamps, and other items.
  • Page 80 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures Cushioning rubber Bolt (Temporary mounting, back side 2 locations, 1 piece each) Front view Crankcase heater Fig. 30 Place the remaining cushioning rubber onto the new compressor at the location shown in the figure 31. (9) Remove the bolts which are temporarily fas- tening the 2 pieces of cushioning rubber, and anchor the 3 compressor legs using the...
  • Page 81 3-WAY SYSTEM 10. Compressor Outdoor Unit Repair Procedures (14) Re-install all components that were removed. Re-install the electrical component box in the same position as it was before. • Be sure to securely re-install the thermal insulation and clamps for the capillary CAUTION tube assembly in their original conditions, as shown in Fig 28.

  • Page 82: High And Low Pressure Sensors

    3-WAY SYSTEM 11. High and Low Pressure Sensors Outdoor Unit Repair Procedures The outdoor unit connection ports for the high and low pressure sensors employ Schrader-type push-to-release valves. Therefore it is not necessary to recover refrigerant when removing and installing them. 11-1.

  • Page 83: Replacing 4-Way Valve

    3-WAY SYSTEM 12. Replacing 4-way valve Outdoor Unit Repair Procedures When replacing 4-way valve of models U-14MF1E8 and 16MF1E8 (for models with 3 compressors), be sure to protect check valves, which are located adjacent to the 4-way valve, while performing replacement work. Models U-8MF1E8 - 12MF1E8 (for models with1 or 2 compressor) is not located near to the check valves, therefore no protection is necessary.
  • Page 84 3-WAY SYSTEM 12. Replacing 4-way valve Outdoor Unit Repair Procedures 12-2. When the replacement is not available from the right side of the unit Follow the instructions of "10. Compressor" and remove the constant-speed compressor 2. Connect the manifold gauge to the high and low-pressure outlet ports at the outdoor unit where the 4-way valve will be replaced.

  • Page 85: Outdoor Unit Maintenance Remote Controller

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

  • Page 86: Overview

    3-WAY SYSTEM 1. Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE [Service Checker Section] CONTROLLER (CZ-RTC2) for 3-WAY SYSTEM ■ 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 87: Functions

    3-WAY SYSTEM 2. Functions Outdoor Unit Maintenance Remote Controller ■ 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 • Test run of all indoor units •...

  • Page 88: Ordinary Display Controls And Functions

    3-WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ 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 RC (3P, BLU) PCB connector (3P, BLU) Special service checker wiring...
  • Page 89 3-WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ● All units start/stop (Fig. 1) <Operation> (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED turns ON when 1 or more indoor units is operating.
  • Page 90 3-WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Display (functions) • Use the temperature setting buttons to change the item code. Item code Item Remarks ➀ Outdoor unit alarm ➁ Alarm code display No. of connected indoor units Quantity Unit Nos.
  • Page 91 3-WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller (3) XX-YY R.C. ➀ ➁ ➂ Locations where , and are displayed Displays the outdoor unit sub-bus address which is as shown in Fig. 3. currently selected. XX = Outdoor system address on main bus line (1 –...
  • Page 92 3-WAY SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Concerning the 7-segment, 4-digit display remote controller timer display The connected unit Nos. are displayed as shown below, using the 7-segment 4-digit ( ) display and the colon.

  • Page 93: Monitoring Operations

    3-WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> ➀ Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to switch to temperature monitor mode. During temperature monitoring, is lit.
  • Page 94 3-WAY SYSTEM 4. Monitoring Operations Outdoor Unit Maintenance Remote Controller ■ Display of unit No. 1 (main unit) Description Remarks Intake temp. °C °C °C °C Indoor unit Discharge temp. °C Discharge temp. setting °C Indoor unit electronic control valve position STEP Discharge temp.

  • Page 95: Outdoor Unit Alarm History Monitor

    3-WAY SYSTEM 5. Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller • Displays outdoor unit alarms only. Does not display indoor unit alarms. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure>...

  • Page 96: Mode Settings

    3-WAY SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller ■ Setting mode 1 Display of fi rst 4 digits <Operating procedure> ➀ Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. ➁ Use the temperature setting buttons to change the item code.
  • Page 97 3-WAY SYSTEM 6. Mode Settings Outdoor Unit Maintenance Remote Controller ■ Setting mode 2 <Operating procedure> ➀ Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. ➁ Use the temperature setting buttons to change the item code.
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  • Page 99: Remote Controller Functions

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

  • Page 100: Simple Settings Function

    3-WAY SYSTEM 1. Simple Settings Function Remote Controller Functions • This allows the filter lifetime, operating mode [Remote Controller Functions Section] 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 101 3-WAY 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 (fi tlter life time) 0003 5,000 hours 0004 10,000 hours 0005...

  • Page 102: Detailed Settings Function

    3-WAY 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 103 3-WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions List of Detailed Setting Items Setting data Item code Item Description Description Description 4-Way Casstte (60×60) 0001 0002 2-WAY Cassette (L1) 0003 1-Way Cassette (D1) (U1, Y1) Low Silhouette Ducted (F1) High Static Pressure Type 0005...
  • Page 104 3-WAY 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 –10°C –009 –9°C Cooling discharge –008 –8°C temperature shift 0010 10°C –010 –10°C –009 –9°C Heating discharge...
  • Page 105 3-WAY 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. 0000 Not used.
  • Page 106 3-WAY 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 fi...
  • Page 107 3-WAY SYSTEM 2. Detailed Settings Function Remote Controller Functions Simple setting items Item code Item Description Filter sign ON time setting Changes the indoor unit fi lter lifetime when a high-performance fi lter or other (fi lter lifetime) optional product is installed. Reduces the fi...
  • Page 108 3-WAY SYSTEM 2. Detailed 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 Enabled only in 2WAY System heat-pump models.
  • Page 109 3-WAY SYSTEM 2. Detailed 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 110 3-WAY 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. These must be set after installation if automatic address setting is not Indoor unit address performed.
  • Page 111 3-WAY 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 112 3-WAY ECO-i 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 113: Remote Controller Servicing Functions

    3-WAY 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. List of Servicing Functions Functions Description Button operation Reset operation Unit status Operation with Press and hold the button...
  • Page 114 3-WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure> ➀ Press and hold the button for 4 seconds or longer. ➁ “Test” appears on the remote controller LCD display (Fig.
  • Page 115 3-WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions ■ Sensor Temperature Display Function (displayed regardless of whether unit is operating or stopped) The procedure below displays the sensor temperatures from the remote controller, indoor unit, and outdoor unit on the remote controller. <Procedure>...
  • Page 116 3-WAY SYSTEM 3. Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 Unit No.3 Intake temp. Discharge temp. 1 Discharge temp. 2 High-pressure sensor temp. Heat exchanger gas 1 Heat exchanger liquid 1 Heat exchanger gas 2 Discharge temp.
  • Page 117 3-WAY SYSTEM Trouble Diagnosis 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.

  • Page 118: Trouble Diagnosis

    3-WAY 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 Remote controller is detecting Error in receiving serial communication signal. (Signal from communication error signal from indoor unit.
  • Page 119 3-WAY 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 unit Compressor 1 (INV) discharge temp. sensor Compressor 2 (constant speed) discharge temp. sensor Compressor 3 (constant speed) discharge temp.

  • Page 120: Outdoor Unit Control Panel Led Display

    3-WAY SYSTEM 2. Outdoor Unit Control Panel LED Display Trouble Diagnosis : ON : Blinking : OFF) LED (RED) Display meaning After the power is turned ON (and automatic 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 automatic address setting is not in progress), 1 or more indoor units are confi...

  • Page 121: Remote Controller Servicing Functions

    3-WAY SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor temperature display function (displayed both when unit is running and stopped) • Use the following check procedure to display the sensor temperatures from the remote controller, indoor unit, and outdoor unit sensors on the remote controller display.
  • Page 122 3-WAY SYSTEM 3. Remote Controller Servicing Functions Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor address Sensor type Sensor address Sensor type is installed Remote controller temperature Discharge temperature sensor Indoor unit intake temperature Indoor unit heat exchanger Indoor unit electronic expansion Indoor unit temperature (E1)

  • Page 123: Way Alarm Codes

    3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis With types 8HP, 10HP and 12HP the INV compressor is compressor 1, and the constant-speed compressor is compressor 2. With types 14HP and 16HP, the INV compressor is compressor 1, and the constant-speed compressors (AC1, AC2) are compressors 2 and 3.
  • Page 124 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis Compressor 1 discharge temperature trouble 5-24 High-pressure switch activated 5-25 Reverse phase (or missing phase) detected 5-25 Compressor 1 (INV) overcurrent 5-26 Compressor 2 discharge temperature trouble 5-24 Compressor 3 discharge temperature trouble 5-24 Fan motor trouble 5-26...
  • Page 125 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis E06 Alarm Alarm code Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit. Alarm conditions Outdoor unit failed to receive serial communication signals from indoor unit. Probable cause (1) The indoor unit power was cut OFF after initial communications were completed.
  • Page 126 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis E16 Alarm Alarm code Alarm meaning Automatic address setting alarm (too many units) Alarm conditions The number of indoor units was too many when automatic address setting was performed. After initial communications were completed, an unrecognized unit was detected. Probable cause (1) The number of indoor units set at the indoor unit quantity setting SW (S004, S005) on the outdoor unit PCB is less than the number set.
  • Page 127 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis E25 Alarm Alarm code Alarm meaning Outdoor unit address setting failure (duplication) 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 128 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis F04, F05, F22 Alarm Alarm code F04, F05, F22 Alarm meaning Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble, Compressor 3 discharge temperature sensor trouble. Alarm conditions (1) Discharge temp. of 100°C or higher was detected 20 minutes or more after that compressor stopped operating.
  • Page 129 3-WAY SYSTEM 4. 3-WAY 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 130 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis F08 Alarm Alarm code Alarm meaning Outdoor air temperature sensor trouble Alarm conditions (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit) Probable cause (1) Sensor malfunction (including connector) (2) PCB malfunction...
  • Page 131 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis F16 Alarm Alarm code Alarm meaning High-pressure sensor trouble (abnormal rise in high pressure) (In some cases this may not be the result of a high-pressure sensor malfunction.) Alarm conditions • High-pressure SW activated although the detected pressure was lower (3.03 MPa or below) than the high-pressure SW activation pressure: Undershift •...
  • Page 132 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis Correction (1) Replace the high-pressure sensor. Caution: Because the high-pressure sensor connection employs a Schrader-type valve, it can be removed and replaced. However, the high-pressure sensor can be easily damaged by high voltage; therefore use suffi cient caution with regard to static electricity.
  • Page 133 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis H11, H12, H21, H22 Alarm Alarm code H11, H12, H21, H22 Alarm meaning H11: Constant speed compressor 2 overcurrent alarm H12: Constant speed compressor 2 lock current alarm H21: Constant speed compressor 3 overcurrent alarm H22: Constant speed compressor 3 lock current alarm Alarm conditions Hx1: During operation, the compressor current value exceeded 20 A for 30 seconds or longer.
  • Page 134 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis H03, H13, H23 Alarm Alarm code H03, H13, H23 Alarm meaning Compressor 1 CT sensor disconnected or short-circuit; Compressor 2 CT sensor disconnected or short-circuit; Compressor 3 CT sensor disconnected or short-circuit Alarm conditions Compressor 1: Current value of more than 18.0 A is detected while the compressor 1 is stopped.
  • Page 135 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis H06 Alarm Alarm code Alarm meaning Low pressure switch activated Alarm conditions A report occurs during A/C operation when the low-pressure sensor installed at constant low-pressure parts detects a pressure of 0.05 MPa or less continuously for 2 minutes, or an instantaneous pressure of 0.02 MPa or less.
  • Page 136 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis H07 Alarm Alarm code Alarm meaning No-oil alarm Alarm conditions This alarm occurs when oil does not fl ow for a specifi ed amount of time in tubing where oil fl ow constantly. (The presence of oil is detected by a temperature sensor.) Judgment method: Tcal (calculated by the formula below from the oil temperature) is compared with the discharge temperature.
  • Page 137 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis H31 Alarm Alarm code Alarm meaning HIC trouble alarm Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal (indicating abnormal HIC temperature or other trouble) from the HIC. The HIC judges the current and temperature, and outputs the trouble signal. In general this indicates trouble with the HIC itself.
  • Page 138 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis L10 Alarm Alarm code Alarm meaning Outdoor unit capacity not set 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 139 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis L17 Alarm Alarm code Alarm meaning Outdoor unit model mismatch Alarm conditions This alarm occurs when a unit other than R410A refrigerant model is connected. Probable cause (1) A unit that uses R407C refrigerant, or a R22 model unit, was connected by mistake. (2) The connected unit is correct, however the refrigerant type setting in the outdoor unit EEPROM (item code 80) is incorrect.
  • Page 140 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis P03, P17, P18 Alarm Alarm code P03, P17, P18 Alarm meaning Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble; Compressor 3 discharge temperature trouble Alarm conditions Inverter compressor 1: Temperature is 105°C or higher and pre-trip stop has occurred. Compressors 2, 3 (constant speed): Pre-trip stop occurs at 105°C or above.
  • Page 141 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis P04 Alarm Alarm code Alarm meaning High-pressure switch activated. Alarm conditions The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the pressure. A pressure of 3.3 MPa or above will short-circuit the terminal. Once the terminal is short-circuited, it will remain in that state until the pressure goes below 2.6 MPa.
  • Page 142 3-WAY SYSTEM 4. 3-WAY Alarm Codes Trouble Diagnosis P16 Alarm Alarm code Alarm meaning Compressor 1 (INV) overcurrent alarm Alarm conditions This alarm occurs when current trouble or current detection trouble occur at an inverter frequency of less than 80 Hz after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 48 A or higher is detected.

  • Page 143: Blinking Inspection Display

    3-WAY SYSTEM 4. 3-WAY ECO-i Alarm Codes Trouble Diagnosis 5. Blinking Inspection Display P29 Alarm Alarm code Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start, and occurs when missing phase or lock is detected, and when a DCCT failure occurs.
  • Page 144 3-WAY SYSTEM 5. Blinking Inspection Display Trouble Diagnosis Blinking inspection display (2) (compressor magnet SW seizing detection) Alarm code (Blinking inspection display) Alarm meaning Compressor magnet SW seizing detected Status: Although an outdoor unit exists where the outdoor unit fan is running, no compressors in the system are operating.

  • Page 145: Inspection Of Parts

    3-WAY SYSTEM 6. Inspection of Parts Trouble Diagnosis (1) High-pressure switch (63PH1, 63PH2, 63PH3) • 63PH1: Disconnect the CN042 connector (3P, WHT) from the outdoor unit control panel. Measure the resis- tance between socket pins 1 and 3. The resistance is OK if the result is 0 Ω. •...

  • Page 146: Test Pin

    3-WAY SYSTEM 7. 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 (CN022, WHT), then turn the power back ON. Output is performed in the sequence shown in the table below, for 0.5 seconds each.

  • Page 147: Symptom: Thermostat In Off Continues Or Cycles Off & On Too Frequently

    3-WAY SYSTEM 8. Symptom: Thermostat in OFF continues or Trouble Diagnosis cycles OFF & ON too frequently How to detect abnormality • Abnormality does not occur. Protective function can be checked when the outdoor maintenance remote controller is connected. Error Diagnosis Adjust setting Indoor control Setting temperature reaches the level set ON thermostat.
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