Page 1 SERVICE MANUAL 2-WAY ECO-i MULTI SYSTEM CHDX07263 CHDXR07263 CHDX09663 CHDXR09663 Outdoor Units Class CHDX07263 CHDX09663 ECO-i W-2WAY CHDXR07263 CHDXR09663 Refrigerant R410A is used in the outdoor units. * Salt-Air Damage Resistant Specifications. Indoor Units Class 4-Way Air Discharge XHX1252 XHX1852 XHX2452 XHX3652 Semi-Concealed...
Page 2 IMPORTANT! Please Read Before Starting When Installing… This air conditioning system meets strict safety and operat- ing standards. As the installer or service person, it is an …In a Room important part of your job to install or service the system so it operates safely and efficiently.
Page 3 Check of Density Limit The room in which the air conditioner is to be installed requires a design that in the event of refrig- erant gas leaking out, its density will not exceed a set limit. The refrigerant (R410A), which is used in the aircondition- er, is safe, without the toxicity or combustibility of ammonia, and is not restricted by laws imposed to protect the ozone layer.
Page 4: Table Of Contents
— CONTENTS — Section 1: CONTROL FUNCTIONS ......... . 1-1 Introduction .
Page 5 Section 5: TROUBLE DIAGNOSIS ......... . 5-1 Contents of Remote Controller Switch Alarm Display .
Page 6: Control Functions
W-2WAY ECO-i SYSTEM Control Functions Contents 1. CONTROL FUNCTIONS 1. Introduction ............1-2 2.
Page 7: Introduction
W-2WAY ECO-i SYSTEM Control Functions 1. Introduction The W-2WAY ECO-i 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 8: Selecting Outdoor Unit For Operation
W-2WAY ECO-i SYSTEM Control Functions 2. Selecting an Outdoor Unit for Operation 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 9: Compressor Control
W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-1. Compressors Mounted in the Outdoor Units [CHDX07263, CHDX09663] Capacity DC Inverter DC Inverter Compressor 1 Rotary Installed compressor Compressor 2 Scroll 5 hp ––– hp = horsepower Constant speed Compressor 2 Compressor 1 Compressor 1 Type 72 Type 96...
Page 10 W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-3. Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity accord- ing to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules.
Page 11 W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-1. Evaporation Temperature (Te) Control: Control of Indoor Units Operating in Cooling Mode 60.8 °F Horsepower increase 53.6 permitted Area A 51.9 51.8 51.8 Horsepower increase Area AB 45.5 permitted 41.1 41.0 41.0 Horsepower increase Area B...
Page 12 W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control 3-6-2. Condensation Temperature (Tc) Control: Control of Indoor Units Operating either in Cooling Mode or Heating Mode PX=125.6 °F Thermostat OFF Area D PX –0.1 Area C Horsepower decrease 118.5 118.4 118.4 Horsepower increase Area B prohibited...
Page 13 W-2WAY ECO-i SYSTEM Control Functions 3. Compressor Control (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 14: Special Controls
W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls In addition to ordinary heating and cooling operation, this system also includes the following 3 types of special con- trols for control of the system as a whole. 4-way Valve Adjustment Control System refrigerant oil recovery control Defrost control 4-1.
Page 15 W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-2-3. Refrigerant Oil Recovery Control between Systems Simplified flow of system refrigerant oil recovery control Refrigerant oil recovery control between systems shall be performed as the flow mentioned below. Normal operation 3-minute stop Refrigerant oil recovery control between systems (Max.
Page 16 W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-3. Frost detection (A) Frost detection does not occur for 5 minutes after operation starts. (B) Frost is detected when either condition 1 or 2 below is met. Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor is operating.
Page 17 W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 4-3-6. Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system. Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit operates in defrost mode (heat exchanger operating as a con- denser), another outdoor unit operates as an evaporator in the same way as in ordinary heating mode.
Page 18 W-2WAY ECO-i SYSTEM Control Functions 4. Special Controls 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 50°F or higher at all temperatures sensors installed on the outdoor unit heat exchanger coils.
Page 19: Other Controls
W-2WAY ECO-i SYSTEM Control Functions 5. Other Controls 5-1. Oil Control 5-1-1. Oil level Oil level Meaning Conditions of oil Judgement The compressor contains oil more than There is no problem. the oil level which is necessary and Sufficient sufficient for normal operation. The compressor contains sufficient oil Confirm that oil is returned after but there is a possibility of shortage...
Page 20: Operation Of Solenoid Valves
W-2WAY ECO-i SYSTEM Control Functions 6. Operation of Solenoid Valves 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 21 W-2WAY ECO-i SYSTEM Control Functions 6. Operation of Solenoid Valves 6-3. Recovery Valve (ORVR) This valve recovers refrigerant oil from the balance tube to the compressor. (1) When unit is stopped This valve is always OFF. (2) When unit is operating This valve turns ON when separator oil self-recovery control is in progress.
Page 22: Outdoor Unit Electronic Thermostatic Expansion Valves [Mov1, Mov2 & Mov4]
W-2WAY ECO-i SYSTEM 7. Outdoor Unit Electronic Thermostatic Expansion Valves Control Functions [MOV1, MOV2 & MOV4] 7-1. Types of Electronic Thermostatic Expansion Valves [CHDX07263, CHDX09663] Capacity Heat exchanger Heat exchanger Electronic 1 valve 1 valve control valve 1 Electronic Electronic Heat exchanger Heat exchanger control valve...
Page 23 W-2WAY ECO-i SYSTEM 7. Outdoor Unit Electronic Thermostatic Expansion Valves Control Functions [MOV1, MOV2 & MOV4] 7-4. SC Circuit Electronic Control Valve [MOV4] (1) SC Control (Cooling Mode only During cooling operation, the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank, and SC (sub-cool = supercooling) approaches 0°F.
Page 24: Outdoor Fan Control
W-2WAY ECO-i SYSTEM Control Functions 8. Outdoor Fan Control 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 25: Demand Control
W-2WAY ECO-i SYSTEM Control Functions 9. Demand Control 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 func- tions.
Page 26: Indoor Unit Control Of The Electronic Control Valve
W-2WAY ECO-i SYSTEM Control Functions 10. Indoor Unit Control of the Electronic Control Valve 10-1. Normal Control (1) Cooling operation Position of electronic control valve Outdoor unit Outdoor unit operating stopped Stopped Thermostat Cooling Thermostat Performs SH control in the range of 55 – 480 –...
Page 27 W-2WAY ECO-i SYSTEM Control Functions 10. Indoor Unit Control of the Electronic Control Valve 10-2. Special Control Operating Control Subject indoor units Position of electronic control valve mode Fixed pulse for cooling, according to indoor unit 4-way valve Cooling All indoor units capacity adjustment control Heating...
Page 28: Rap Valve Kit Control
W-2WAY ECO-i SYSTEM Control Functions 11. Rap Valve Kit Control A gas tube valve kit may be connected to the Type D indoor unit. When the gas tube valve kit is connected, operations of gas tube valve kit and indoor unit electronic thermostatic expansion valve are as shown in the table.
Page 29: Indoor Unit Refrigerant Oil Self Recovery Control
W-2WAY ECO-i SYSTEM Control Functions 12. Indoor Unit Refrigerant Oil Self Recovery Control This control is carried out regularly in cooling mode only. During stopped, fan or thermostat OFF condition, indoor unit expansion valve is opened regularly for 1 to 2 min- utes regularly (at an interval of once every 2 hours.) During the thermostat ON, the indoor unit electronic thermostatic expansion valve is opened about 10 pulses from the current status.
Page 30: Discharge Temperature
W-2WAY ECO-i SYSTEM Control Functions 13. Discharge Temperature <Alarm Information> (1) Discharge temperature protection alarm This device sets an upper limit discharge temperature of 222°F for all compressors. When the discharge tem- perature reaches 222°F, that compressor is stopped and restarted. If the same high discharge condition occurs 4 times, then an alarm occurs.
Page 31: Current Protection
W-2WAY ECO-i SYSTEM Control Functions 14. Current Protection (1) Fan motor Alarm Description Occurs when the fan motor detects over current, or when the motor is locked and does not turn. (2) Inverter compressor Alarm Description Occurs during ordinary operation when overcurrent (27 A) is detected. Occurs under the same conditions as P16 when the inverter compressor is operating at or above 80 Hz.
Page 32: Pressure Sensor Failure
W-2WAY ECO-i SYSTEM Control Functions 15. Pressure Sensor Failure This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor. High-pressure sensor failure Alarms are emitted when the high-pressure sensor becomes an electrical open-circuit or a short-circuit condi- tions, and a broken wiring, short-circuit or poor connection to the PCB in the high-pressure sensor circuit.
Page 33: Backup Operation
W-2WAY ECO-i SYSTEM Control Functions 16. Backup Operation <Field Application Functions> Backup Operation 16-1. 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 34 W-2WAY ECO-i SYSTEM Control Functions 16. Backup Operation Outdoor unit tonnage 8 Ton Switches to turn ON INV+AC1+BU (C) Close all service valves at the failed outdoor units. (D) Reset the power at outdoor unit No.1. * When the PCB of the main unit is normal, by implementing the above settings while leaving the communica- tion lines between indoor and outdoor units as they are, backup operation of units are possible.
Page 35: Service Maintenance Functions
W-2WAY ECO-i SYSTEM Control Functions 17. Service Maintenance Functions The outdoor unit EEPROM settings can be used for the following functions. 17-1. 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 36 W-2WAY ECO-i SYSTEM Control Functions 17. Service Maintenance Functions 17-5. Optional Solenoid Valve Control Operation Setting: Outdoor EEPROM C0 (set at each outdoor unit) Operation Setting No output (setting at time of factory shipment) Refrigerant shut-off valve control (for cooling when the outdoor air temperature is below standard conditions) External liquid valve control (used in special cases when the discharge gas temperature is especially likely to rise) 17-6.
Page 37: Other Functions
W-2WAY ECO-i SYSTEM Control Functions 18. Other Functions 18-1. 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 38 W-2WAY ECO-i SYSTEM Control Functions 18. Other Functions (3) Outdoor unit PCB LED indications in judgment mode Judgment items LED1 Recommended response LED2 Judgment mode Blinking Blinking Normal Insufficient gas Blinking Charge with refrigerant a little at a time. Overcharge Blinking Recover refrigerant a little at a time.
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Page 40: Outdoor Unit Repair Procedures
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures Contents 2. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels ............2-2 2.
Page 41: Removing Panels
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 1. Removing Panels 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.
Page 42: Removing Electrical Component Box And Duct
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 2. Removing Electrical Component Box and Duct 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 43 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 2. Removing Electrical Component Box and Duct (7) Remove the lower duct: (remove 2 screws, and a hook) Lower duct Fig. 6 (8) Remove the upper duct: (remove 3 screws) (Fig. 7) Upper duct Fig.
Page 44: Discharging Compressor Oil
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 3. Discharging Compressor Oil 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 45: Backup Operation
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation 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 opera- tion.
Page 46 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation <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 47: Backup Operation
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 4. Backup Operation 4-2-2. Backup operation by setting the failed compressor not to operate Backup operation settings for each compressor INV compressor AC1 compressor Setting for backup operation DIP switch S010: Failed Turn BACK UP and AC1 ON. DIP switch S010: Failed Turn BACK UP and INV ON.
Page 48: Recovering Refrigerant
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant 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 49 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant 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 50 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant (2) If the remote controller (RCS-TM80BG) is not available for maintenance of the outdoor unit Determine the outdoor unit where the unit No. setting (S007) (3P DIP switch) (Blue) on the outdoor unit control PCB is set to No.
Page 51 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant 5-2-3. 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 52 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 5. Recovering Refrigerant Manifold Liquid tube service port gauge (For 5/16" (7.94mm)-dia. connector) Refrigerant recover unit Refrigerant recovery cylinder Gas tube service port (For 5/16" (7.94mm)-dia. connector) Fig. 11 5-3. Recovery of Refrigerant from Entire System (1) Turn off power to the entire outdoor system.
Page 53: Checking For Leakage After Repair
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 6. Checking for Leakage After Repair 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 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 54: Evacuating System
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 7. Evacuating System 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 gas tubes, liquid tube, and balance tube in the outdoor unit are fully closed. (2) Connect the manifold gauge valves to the high-pressure and low-pressure sensor outlets of the outdoor unit.
Page 55: Charging Compressor Oil
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil 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.
Page 56 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil (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 57 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil 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 58 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 8. Charging Compressor Oil Oil tube outlet port (For 1/4" (6.35mm)-dia. connector) High-pressure outlet port (For 5/16" (7.94mm)-dia. connector) Manifold gauge Vacuum pump Low-pressure outlet port (For 5/16" (7.94mm)-dia. connector) Fig. 19 8-3. Charging Additional Compressor Oil (after replacing compressor) The rated amount of oil is pre-charged in the compressors as given below: Model name Compressor model...
Page 59: Pumping Out Refrigerant From Outdoor Unit
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 9. Pumping Out Refrigerant from Outdoor Unit Required equipment and tools: Jumper wire with clips, adjustable wrench, set of manifold gauge valves for the refrigerant R410A, refrigerant recovery unit, pre-purged refrigerant cylinder for recovery, flat-head screwdriver, and outdoor unit maintenance remote controller.
Page 60 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 9. Pumping Out Refrigerant from Outdoor Unit (8) 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 61: Pumping Out Refrigerant From Outdoor Unit
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 9. Pumping Out Refrigerant from Outdoor Unit (9) Close the gas tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube ser- vice valve. * When the low pressure at the outdoor unit to be repaired reaches 72.5 psi or below, pull out the SCT connec- tor (2P) (YEL) (CN231) from the outdoor unit control PCB of that outdoor unit.
Page 62: Compressor
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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) (2) Electrical trouble (A) Coil burning...
Page 63 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2. Replacing the Compressor(s) 10-2-1. Replacing only the failed compressor (1) If backup operation is required, follow the instructions in “4. Backup Operation” and engage backup operation. (2) Follow the instructions in “10-3. Removing and Installing Compressors” and replace the failed compressor. (3) Fully close the high- and low-pressure gauge valves on the manifold gauge, then stop the vacuum pump.
Page 64 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2-2. Replacing all compressors in a failed unit (1) 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. (2) If backup operation is required, follow the instructions in “4.
Page 65 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 10-2-3. Replacing all compressors in a system (1) Follow the instructions in “3. Discharging Compressor Oil” and drain the oil from the oil separators in all out- door units. Measure the amount of drained oil. (2) Follow the instructions in “10-3.
Page 66 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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 67 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (14) Perform steps (1) – (4), and remove all dry cores. Then connect the tubing between the liquid (narrow) tube valves and the ball valves. (15) At all outdoor units where dry cores were removed, pressurize with 478.6 psi of nitrogen from the liquid tube service port and check for leaks.
Page 68 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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 types 90 and 140, 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 compressor...
Page 69 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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 70 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (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 71 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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 72 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor 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. 28 Set the remaining cushioning rubber beneath the new compressor leg at the locations shown in the figure 28. 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 73 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 10. Compressor (C) Replacing multiple compressors Removal Follow the instructions in “(A) Replacing the inverter compressor,” “(B) Replacing constant-speed compressor,” and remove the compressors. * There is no predetermined sequence for removal; any compressor may be removed first. Installation Follow the instructions in “(A) Replacing the inverter compressor,”...
Page 74: High And Low Pressure Sensors
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 11. High and Low Pressure Sensors 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 75: Replacing 4-Way Valve
W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 12. Replacing 4-way Valve When replacing 4-way valve of type 96 (for type with 1 or 2 compressor), be sure to protect check valves, which are located adjacent to the 4-way valve, while performing replacement work. Type 72 (for type with 1 compressor) is not located near to the check valves, therefore no protection is necessary.
Page 76 W-2WAY ECO-i SYSTEM Outdoor Unit Repair Procedures 12. Replacing 4-way Valve 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.
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Page 78: Outdoor Unit Maintenance Remote Controller
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller Contents 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview ............. . 3-2 2.
Page 79: Overview
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 1. Overview [Service Checker Section] OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER (RCS-TM80BG) for W-2WAY ECO-i 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 80: Functions
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 2. Functions 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 81: Ordinary Display Controls And Functions
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions 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 82 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions All units start/stop (Fig. 1) <Operation> (ON/OFF operation) button can be used to start and stop all the indoor units. • The LED illuminates if any indoor units is operating. •...
Page 83 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions Display (functions) • Use the temperature setting buttons to change the item code. Item code Item Remarks Outdoor unit alarm Alarm code display No. of connected indoor units Quantity Unit Nos.
Page 84 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions (3) XX-YY R.C. 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 – 30) YY = Outdoor unit sub-bus address (1 –...
Page 85 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 3. Ordinary Display Controls and Functions 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 86: Monitoring Operations
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations Display the indoor unit and outdoor unit sensor temperatures. <Operating procedure> 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 87 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 4. Monitoring Operations Display of unit No. 1 (main unit) Description Remarks Intake temp. °F °F °F °F Indoor unit Discharge temp. °F Discharge temp. setting °F Indoor unit electronic control valve position STEP Discharge temp.
Page 88: Outdoor Unit Alarm History Monitor
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 5. Outdoor Unit Alarm History Monitor • Displays outdoor unit alarms only. • Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device. <Operating procedure> Press and hold the (CHECK) button and button simultaneously for 4 seconds or longer to engage...
Page 89: Mode Settings
W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 6. Mode Settings Setting mode 1 Display of ﬁrst 4 digits <Operating procedure> Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. Press the temperature setting buttons to change the item code.
Page 90 W-2WAY ECO-i SYSTEM Outdoor Unit Maintenance Remote Controller 6. Mode Settings Setting mode 2 <Operating procedure> Press and hold the (CHECK) button, button, and button simultaneously for 4 seconds or longer. Press the temperature setting buttons to change the item code.
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Page 92: Remote Controller Functions
W-2WAY ECO-i SYSTEM Remote Controller Functions Contents 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function ..........4-2 2.
Page 93: Simple Settings Function
W-2WAY ECO-i SYSTEM Remote Controller Functions 1. Simple Settings Function • 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 94: Simple Settings Function
W-2WAY ECO-i SYSTEM Remote Controller Functions 1. Simple Settings Function List of Simple Setting Items Setting data Item code Item Description 0000 Not displayed 0001 150 hours Filter sign ON time 0002 2,500 hours (ﬁtlter life time) 0003 5,000 hours 0004 10,000 hours 0005...
Page 95: Detailed Settings Function
W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function • 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 96 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function List of Detailed Setting Items Setting data Item code Item Description Description Description 4-Way Air Discharge (Mini) Slim Concealed-Duct 1-Way Air Discharge 0000 0001 0005 Semi-Concealed (X, XM) (U, UM) Semi-Concealed (A) Concealed-Duct High 0006...
Page 97 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function Setting data Item code Item Description 0000 5 minutes (1B) Forced thermostat ON time 0001 4 minutes –010 –20°F –009 –18°F Cooling discharge –008 –16°F temperature shift 0010 20°F –010 –20°F –009 –18°F...
Page 98 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 99 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 100 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 101 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 102 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 103 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 104 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function 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 105 W-2WAY ECO-i SYSTEM Remote Controller Functions 2. Detailed Settings Function (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 106: Remote Controller Servicing Functions
W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing 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...
Page 107 W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions Test Run Function Operates the unit with the thermostat forced ON. <Procedure> Press and hold the button for 4 seconds or longer. “Test” appears on the remote controller LCD display (Fig.
Page 108 W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing 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 109 W-2WAY ECO-i SYSTEM Remote Controller Functions 3. Remote Controller Servicing Functions Outdoor unit sensors Indoor unit sensors Unit No.1 Unit No.2 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 110: Section 5: Trouble Diagnosis
W-2WAY ECO-i SYSTEM Trouble Diagnosis Contents 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display ......5-2 2.
Page 111: Trouble Diagnosis
W-2WAY ECO-i SYSTEM Trouble Diagnosis 1. Contents of Remote Controller 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 112 W-2WAY ECO-i SYSTEM Trouble Diagnosis 1. Contents of Remote Controller Switch Alarm Display Blinking: OFF: Wired Wireless remote remote controller control receiver display display Possible cause of malfunction Thermistor fault Outdoor unit Compressor intake temp. sensor (suction temp) Operating and timer High-pressure sensor lamps blinking Low-pressure sensor...
Page 113: Outdoor Unit Control Panel Led Display
W-2WAY ECO-i SYSTEM Trouble Diagnosis 2. Outdoor Unit Control Panel LED Display : 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), one or more indoor units are conﬁrmed in that system;...
Page 114: Remote Controller Servicing Functions
W-2WAY ECO-i SYSTEM Trouble Diagnosis 3. Remote Controller Servicing Functions 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 115 W-2WAY ECO-i SYSTEM Trouble Diagnosis 3. Remote Controller Servicing Functions 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 116: W-2Way Eco-I Alarm Codes
W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes With type 96, the INV compressor is compressor 1, and the constant-speed compressor is compressor 2. With type 72, the INV compressor is compressor 1. Alarm code Alarm meaning Page Outdoor unit failed to receive serial communication signals from indoor unit.
Page 117 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes Compressor 1 discharge temperature trouble 5-23 High-pressure switch activated 5-24 Reverse phase (or missing phase) detected 5-24 Compressor 1 (INV) overcurrent alarm 5-25 Compressor 2 discharge temperature trouble 5-23 Fan motor trouble 5-25 Inverter compressor high-frequency overcurrent alarm 5-26...
Page 118 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 119 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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. •...
Page 120 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 121 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes F04, F05 Alarm Alarm code F04, F05 Alarm meaning Compressor 1 discharge temperature sensor trouble, compressor 2 discharge temperature sensor trouble. Alarm conditions (1) Discharge temp. of 212°F or higher was detected 20 minutes or more after that compressor stopped operating.
Page 122 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 123 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 124 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 •...
Page 125 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 sufﬁcient caution with regard to static electricity.
Page 126 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H11, H12 Alarm Alarm code H11, H12 Alarm meaning H11: Constant speed compressor 2 overcurrent alarm H12: Constant speed compressor 2 lock current alarm Alarm conditions H11: During operation, the compressor current value exceeded 20 A for 30 seconds or longer. However this alarm is not detected for 4 seconds after the compressor starts.
Page 127 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H03, H13 Alarm Alarm code H03, H13 Alarm meaning H03: Compressor 1 CT sensor disconnected or short-circuit H13: Compressor 2 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. Compressor 2: Current value at compressor 2 is less than 2.0 A when 2 seconds or more had passed after the compressors began operation and output.
Page 128 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 7.3 psi or less continuously for 2 minutes, or an instantaneous pressure of 2.9 psi or less.
Page 129 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H07 Alarm Alarm code Alarm meaning No-oil alarm Alarm conditions This alarm occurs when oil does not ﬂow for a speciﬁed amount of time in tubing where oil ﬂow 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 130 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes H08, H27 Alarm Alarm code H08, H27 Alarm meaning Trouble (open circuit) with the oil sensor (connection) at compressor 1, compressor 2 Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, pins 4 and 5 for compressor 2) is open.
Page 131 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes L04 Alarm Alarm code Alarm meaning Outdoor system address duplication Alarm conditions Communication by inter-unit control wiring was received that contained the same address as that unit 5 times or more within 3 minutes. Probable cause Incorrect outdoor system address settings Check...
Page 132 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P03, P17 Alarm Alarm code P03, P17 Alarm meaning Compressor 1 discharge temperature trouble; Compressor 2 discharge temperature trouble Alarm conditions Temperature is 222°F or higher and pre-trip stop has occurred. The alarm occurs when pre-trip stop occurs more than once.
Page 133 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 478.6 psi or above will short-circuit the terminal. Once the terminal is short-circuited, it will remain in that state until the pressure goes below 377.1 psi.
Page 134 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes 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 13.5 A or higher is detected.
Page 135 W-2WAY ECO-i SYSTEM Trouble Diagnosis 4. W-2WAY ECO-i Alarm Codes P26 Alarm Alarm code Alarm meaning Inverter compressor high-frequency overcurrent alarm Alarm conditions This alarm occurs when current trouble or current detection trouble occurs at an inverter frequency of 80 Hz or higher after start (when trouble judgment current is detected in the primary or secondary current, or when an instantaneous secondary current of 13.5 A or higher is detected).
Page 136: Blinking Inspection Display On The Remote Controller
W-2WAY ECO-i SYSTEM Trouble Diagnosis 5. Blinking Inspection Display on the Remote Controller 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 137: Inspection Of Parts
W-2WAY ECO-i SYSTEM Trouble Diagnosis 6. Inspection of Parts (1) High-pressure switch (63PH1, 63PH2) • 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 138: Test Pin
W-2WAY ECO-i SYSTEM Trouble Diagnosis 7. Test Pin 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 139: Thermister Characteristics Curve
W-2WAY ECO-i SYSTEM Trouble Diagnosis 8. Thermister Characteristics Curve 8-1. Room temp.sensor Temperature sensor Temperature (˚C) 8-2. Indoor heat exch. coil sensor (E1, E3) Indoor Heat Exchanger temperature sensor [E1, E3] Temperature (˚C) Temperature (˚C) 5 - 30...
Page 140: Thermister Characteristic Curve
W-2WAY ECO-i SYSTEM Trouble Diagnosis 8. Thermister Characteristics Curve 8-3. Outdoor temp. sensor, Compressor suction gas temp. sensor Outdoor heat exch. coil sensor (C1, C2) Outdoor temperature, Suction gas temperature (TS) sensor Heat exchanger temperature, Heat exchanger temperature sensor -20 -15 -10 -5 Temperature (°C) Temperature (°C) 8-4.
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Page 142 For Parts or Service Assistance please contact your local Sanyo HVAC Contractor or Distributor United States: SCS, HVAC Solutions Canada: Sanyo Canada Inc. Web: www.SanyoHVAC.com Web: www.SanyoHVAC.com Parts: hvac.parts@sna.sanyo.com Parts/Service: hvac@sci.sanyo.com Service: hvac.service@sna.sanyo.com 201002...

Sanyo CHDXR09663* Service Manual

Control Functions

Introduction

2 Selecting Outdoor Unit for Operation

Compressor Control

Special Controls

Other Controls

Operation of Solenoid Valves

Outdoor Unit Electronic Thermostatic Expansion Valves [MOV1, MOV2 & MOV4]

Outdoor Fan Control

Demand Control

Indoor Unit Control of the Electronic Control Valve

Rap Valve Kit Control

Indoor Unit Refrigerant Oil Self Recovery Control

Discharge Temperature

Current Protection

Pressure Sensor Failure

Backup Operation

Service Maintenance Functions

Other Functions

Outdoor Unit Repair Procedures

Outdoor Unit Maintenance Remote Controller

Overview

Remote Controller Functions

Trouble Diagnosis

Quick Links

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Summary of Contents for Sanyo CHDXR09663*

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