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Pioneer WYT Series Service Manual

Ductless mini split system air conditioner / heat pump
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DUCTLESS MINI SPLIT SYSTEM AIR CONDITIONER / HEAT PUMP
WYT Inverter Series
For 9,000-36,000 BTU/hr Systems
Service Manual
CS78421-548-754
IMPORTANT NOTICE:
Please read this manual carefully before installing
or operating your new air conditioning system.
Be sure to save this manual for future reference.

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  Summary of Contents for Pioneer WYT Series

  • Page 1 DUCTLESS MINI SPLIT SYSTEM AIR CONDITIONER / HEAT PUMP WYT Inverter Series For 9,000-36,000 BTU/hr Systems Service Manual CS78421-548-754 IMPORTANT NOTICE: Please read this manual carefully before installing or operating your new air conditioning system. Be sure to save this manual for future reference.
  • Page 2: Table Of Contents

    Air Conditioner Service Manual Table of Contents 1. Important Notice 2. Product Dimensions 3. Refrigeration cycle diagram 4. Operation details 5. Wiring diagram 6. Explosion view and parts 7. Precaution 8. Names of parts 9. Installation Trouble shooting Models WYT009ALFI19RL WYT018GLFI19RL WYT009GLFI19RL WYT024GLFI19RL...
  • Page 3: Important Notice

    Air Conditioner Service Manual 1. Important Notice This service manual is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. attempt to repair the appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.
  • Page 4: Product Dimensions

    Air Conditioner Service Manual 2. Product Dimensions Indoor Unit: Indoor unit(mm/inch) Model WT009GLFI19HLD 811(31.9) 292(11.5) 203(7.99) WT012GLFI19HLD 811(31.9) 292(11.5) 203(7.99) WT009ALFI19HLD 811(31.9) 203(7.99) 292 (11.5) 203 (7.99) WT012ALFI19HLD 811(31.9) 292(11.5) WT018GLFI19HLD 1010 (39.8) 220(8.7) 315(12.4) (10.2) WT024GLFI19HLD 1186 (46.7) 340(13.4) 2 58 WT036GLFI19HLD 1186(46.7)
  • Page 5 Air Conditioner Service Manual Outdoor Unit: Outdoor unit(mm/inch) Model 787(31.0) 498(19.6) 290(11.4) 415(16.3) 225(8.9) 48.5(1.9) 52(2) YN009GLFI19RPD YN012GLFI19RPD 787(31.0) 498(19.6) 290(11.4) 415(16.3) 225(8.9) 48.5(1.9) 52(2) 810(31.9) 549(21.6) 305(12.0) 433.8(17.1) 278(10.9) 48(1.9) 62(2.4) YN009ALFI19RPD 810(31.9) 549(21.6) 305(12.0) 433.8(17.1) 278(10.9) 48(1.9) 62(2.4) YN012ALFI19RPD YN018GLFI19RPD 863(34) 602(23.7) 349(13.7) 516(20.3)
  • Page 6: Refrigeration Cycle Diagram

    Air Conditioner Service Manual 3. Refrigeration cycle diagram Cooling only Liquid side 2-way valve Capillary Heat exchange Heat exchange (Evaporator) (condenser) Gas side 3-way valve Accumulator Compressor Heat pump Check valve Liquid side 2-way valve Capillary Assembly Heat exchange Heat exchange (Evaporator) (condenser) Gas side...
  • Page 7: Operation Details

    Air Conditioner Service Manual 4. Operation Details Remote controller ON/OFF button To switch the conditioner on and off. ECO button In cooling mode,press this button ,the temperature will increase 2 on the base of setting temperature: In heating mode, press this button, the temperature will decrease 2 on the base of setting temperature.
  • Page 8 Air Conditioner Service Manual 4.2 Electronic Controller 4.2.1 Safety Protection (1) Time Delay for Safety protection 3 minutes delay for compressor ---The compressor is ceased for 3minutes before restarting to balance the pressure in the refrigeration cycle in order to protect the compressor.
  • Page 9 Air Conditioner Service Manual down, the compressor running frequency will go down. When room temperature is lower than set temperature, the compressor will run at very low frequency. In general, unit will change its running frequency according to δt to make room temperature closing to set temperature . (2) Outdoor temperature affects running frequency of the compressor Outdoor temperature affect compressor’s running frequency.
  • Page 10 Air Conditioner Service Manual In heating operation, if air conditioner turn off, the indoor fan motor will run most for 30 seconds since the stop of compressor. 2) Auto fan control (heating) In heating mode (include in “FEEL” mode), fan speed is determined by δt as the following: RT-ST δt come up δt come down...
  • Page 11 Air Conditioner Service Manual (5) Indoor exchanger overheat protection When Indoor exchanger Temperature (IPT) is higher than 55℃(131℉) , unit comes into indoor exchanger overheat protection. The compressor drops its frequency toward to F1 level until IPT≤ 52℃(125.6℉) If IPT≤ 52℃(125.6℉) and keep for 5 minutes, control system do esn’t limit running frequency. If IPT>62℃(143.6℉), control system shut down compressor, and recover while IPT drop less than 50℃(122℉).
  • Page 12 Air Conditioner Service Manual Error list Digital LED Code Failure Type LED Code RUN、TIMER –both winking Indoor and outdoor communication fault RUN、TIMER –both winking Outdoor communication failure Indoor room temperature sensor (IRT) fault RUN-1 time/8s Indoor coil temperature sensor (IPT) fault RUN-2 times /8s Outdoor coil temperature sensor (OPT) RUN-3 times /8s...
  • Page 13 Air Conditioner Service Manual Display on outdoor power source board: blink time (n) Failure IPM protection Over voltage /lower voltage Overcurrent Exhaust over temperature protection Outdoor coil over temperature protection Drive fault and protection (V1,VP1) Communication fault with indoor unit Compressor overheat fault (compressor top switch) Short-circuit / open-circuit fault of outdoor temperature sensor Short circuit / open-circuit fault of outdoor heat exchanger temperature...
  • Page 14: Wiring Diagram

    Air Conditioner Service Manual 5. Wiring diagram MODEL: WYT009ALFI19RL , WYT012ALFI19RL INDOOR UNIT: θ θ θ OUTDOOR UNIT θ θ θ...
  • Page 15 Air Conditioner Service Manual MODEL: WYT012GLFI19RL θ θ θ OUTDOOR UNIT θ θ θ...
  • Page 16 Air Conditioner Service Manual WYT009GLFI19RL, WYT018GLFI19RL,WYT024GLFI19RL , WYT036GLFI19RL INDOOR UNIT OUTDOOR UNIT θ θ θ...
  • Page 17: Precaution

    Air Conditioner Service Manual Precaution 7.1 SAFETY RULES AND RECOMMENDATIONS FOR THE INSTALLATION Read this guide before installing and using the appliance. During the installation of the indoor and outdoor units the access to the working area should be forbidden to children. Unforeseeable accidents could happen.
  • Page 18 Air Conditioner Service Manual Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision. 7.2 SAFETY RULES AND RECOMMENDATIONS FOR THE USER Do not try to install the conditioner alone; always contact specialized technical personnel. Cleaning and maintenance must be carried out by specialized technical personnel.
  • Page 19 Air Conditioner Service Manual 7.3 SAFETY RULES AND PROHIBITIONS Do not bend, tug or compress the power cord since this could damage it. Electrical shocks or fire are probably due to a damaged power cord. Specialized technical personnel only must replace a damaged power cord.
  • Page 20: Names Of Parts

    Air Conditioner Service Manual 8.Names of parts INDOOR UNIT Indoor unit 2-3 4 Name Front panel Air filter Special filter(option) Display PCB Vertical vane Horizontal vane Remote controller Outdoor unit Name Air outlet grille Electronic box cover 2-way valve 3-way valve OUTD OOR UNIT...
  • Page 21: Installation

    Air Conditioner Service Manual 9. Installation manual 9.1 Installation Details Connecting pipe length Pipe size(Inch) Model Liquid WYT009GLFI19RL WYT009ALFI19RL WYT012GLFI19RL WYT012ALFI19RL WYT018GLFI19RL WYT024GLFI19RL WYT036GLFI19RL Outdoor unit Indoor unit Pipe length is 15 Pipe length is 15 m(59Inch) Max. m(59Inch) Max. Indoor unit Outdoor unit Refrigerant piping...
  • Page 22 Air Conditioner Service Manual 9.2 Installation for the first time Indoor unit Install the indoor unit level on a strong wall that is not subject to vibrations Mounting plate The inlet and outlet ports should not be 150mm(5.9") 150mm(5.9") obstructed: the air should be able to blow all over 150mm(5.9") the room.
  • Page 23 Air Conditioner Service Manual Install the indoor unit at a height of at least 2.5m(0.1") appliance has been installed so that it can be from the ground. pulled out if necessary. To install, proceed as follows: 9.2.1 Installation of the mounting plate. 9.2.2.1 By using a level, put the mounting plate in a perfect square position vertically and horizontally.
  • Page 24 Air Conditioner Service Manual 7).An efficient earth connection must be ensured. 8).If the power cable is damaged, it must be replaced by an authorized Service Centre. 9.2.4 Refrigerant piping connection The piping can be run in the 3 directions indicated by numbers in the picture.
  • Page 25 Air Conditioner Service Manual 4).If the piping is installed to the right, the pipes, power cable and drain hose must be lagged and secured onto the rear of the unit with a pipe connection. Insert the pipe connection into the relative slot. Press to join the pipe connection to the base.
  • Page 26: Trouble Shooting

    Air Conditioner Service Manual 10. Trouble shooting 10.1 Outdoor control diagram Indoor control system Outdoor control system Indoor control board Outdoor PCB Communication with outdoor unit Communication with indoor unit Indoor fan control Storage of working parameters Louver motor control Frequency generation Health assembly control Outdoor temperature detection...
  • Page 27 Air Conditioner Service Manual WYT018GLFI19RL, WYT024GLFI19RL, WYT036GLFI19RL 10.3 Connection of ODU PCB WYT009GLFI19RL, WYT009ALFI19RL, WYT012GLFI19RL, WYT012ALFI19RL COMP. (S-Black) CN12 CN13 CN401 ( LEV) (OVT) (OPTOAT) ( ORQ) (485-COM) (OHT) (CAN-Blue) P5-1、P8 w u v (VAL) CN409 (ACL-Brown) CN12-2 programmed CN11 CN410 (OUTFAN) P10-3(W)
  • Page 28 Air Conditioner Service Manual WYT018GLFI19RL, WYT024GLFI19RL, WYT036GLFI19RL COMP. CN13 CN12 ( LEV ) (OHT ) (OPTOAT) ( ORQ ) (ACN) (OVT ) CN409 CN11 (AC L) (HEAT) CN410 programmed (OUTFAN) P10-1(U) U603 P5-1、 P8 CN401 (VAL) P10-2(V) (DCFAN) (485- C OM ) CN407 P10-3(W) For EEPROM...
  • Page 29 Air Conditioner Service Manual 10.5 Examples of repairing 10.5.1 Display E1 or E2 Reasons : 1) The sensor connection terminal loose or not plugged in. Solution: Check the connecter of sensor and slot (CN6), if loose or not plugged in, please connect again.
  • Page 30 Air Conditioner Service Manual 3) The indoor main PCB damage. Solution: Replace the indoor main PCB. 10.5.3 Display E3, E7 Reasons: connection terminal loose or not plugged in. 1) Outdoor pipe temp sensor, outdoor temp sensor Solution: Check the connecter of sensor and slot, if loose or not plugged in, please connect again. 2) Outdoor pipe temp sensor and outdoor temp sensor damage (short or broken).
  • Page 31 Air Conditioner Service Manual Outdoor pipe temp sensor damage. Fail Solution: Check and replace the sensor. 3) Outdoor PCB damage. Solution: Check and replace the outdoor PCB. 10.5.5 Display E0,E5 Reason Indoor / outdoor communication damage. Solution: 1) Check if the indoor and outdoor connections are correct. The terminal L and N which connect to indoor unit shall correspond to each other on indoor and outdoor units.
  • Page 32 Air Conditioner Service Manual 1 N L 5) Communication fault if resistance or optical coupler broken, replace outdoor PCB. Communication circuit 6) Is there any burnt on PCB? If no, test the rectifier, FRD, IGBT etc. any component broken, replace PCB.
  • Page 33 Air Conditioner Service Manual 10.5.7 Display E9 ( first display P0 or P9) Reason: Outdoor PCB drive circuit damage. Solution: Re-energize and check the protection code on display. Firstly display P0. 1) If this code is displayed when the compressor is started for several seconds or even not started, check the compressor connection for correctness, if no insert wrong, replace outdoor PCB.
  • Page 34 Air Conditioner Service Manual 10.5.9 Display EE Reason: EEPROM fault. Solution: Shut down power supply and reenergize it, if the fault remains there, check the EEPROM installation, if no problem, please replace outdoor PCB. EEPROM 10.5.10 Display CL Cause: Air filter duty, the unit operation Cumulative time 500 hours, the controller will confirmation the filter dirty and display CL.
  • Page 35 Air Conditioner Service Manual 10.6.2 DC Over Current Error Error memory is recorded Start Are valves (2-way or 3-war) close? Full open stop valves Does compressor rotates? Does compressor rotates more than 30 seconds? IPM PWB floating from the heat sink IPM PWB with screws securely.
  • Page 36 Air Conditioner Service Manual 10.6.3 E0,E5 Error Replace inverter board and power Display E5 Start supply board or outdoor PCB assembly Display E0 Display E5 Display E5 Shut off power and supply Shut off power Replace inverter board observe 10 Mins and supply again again and Display E0...
  • Page 37 Air Conditioner Service Manual 10.7 THERMISTOR TEMPERATURE CHARACTERISTICS 1. Indoor unit and outdoor exchange temperature and outside air temperature sensor temperature characteristics TEMP. Resistance Voltage of TEMP. Resistance Voltage of TEMP. Resistance Voltage of ℃(℉) ℃(℉) ℃(℉) (k Ohm) resistance (k Ohm) resistance (k Ohm)
  • Page 38 Air Conditioner Service Manual TH1: indoor room temperature sensor and outside air temperature sensor TH2: indoor exchange temperature sensor and outside exchange temperature sensor Before measuring resistance, disconnect connectors as shown above. 2. Outdoor unit sensor temperature characteristics TEMP. R min R(t) R max TEMP.
  • Page 39 Air Conditioner Service Manual -2(-35.6) 63.74 70.48 77.87 6.309 6.655 7.013 106(222.8) 1.073 1.12 1.168 52(125.6) -1(-33.8) 60.69 67.05 6.08 6.409 6.748 107(224.6) 1.042 1.089 1.136 53(127.4) 0(32) 57.81 63.8 70.34 5.861 6.173 6.495 108(226.4) 1.013 1.058 1.104 54(129.2) 1(33.8) 55.08 60.72 66.88...