Panasonic WU-144MF1U9E 3-Way Service Manual

Panasonic WU-144MF1U9E Manual

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  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 1
    SERVICE MANUAL U-72MF1U9 U-72MF1U9E* U-96MF1U9 U-96MF1U9E* 3WAY VRF SYSTEM Model No. Outdoor Units Class 72 96 Model Name U-72MF1U9 U-96MF1U9 U-72MF1U9E* U-96MF1U9E* Refrigerant R410A is used in
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 2
    are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your certified dealer for additional instructions. In Case of Improper Installation The manufacturer shall in no way be responsible for improper
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 3
    • Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced. • Do not clean inside the indoor and WARNING outdoor units by users. Engage authorized dealer or specialist for cleaning. • In case of malfunction of this
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 4
    Precautions for Installation Using New Refrigerant 1. Care regarding tubing 1-1. Process tubing Material: Use C1220 phosphorous deoxidized copper specified in JIS H3300 "Copper and Copper Alloy Seamless Pipes and Tubes." For tubes of ø7/8" (ø22.22 mm) or larger, use C1220 T-1/2H material or H
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 5
    3-2. Use R410A exclusive cylinder only. Single-outlet valve (with siphon tube) Liquid refrigerant should be recharged with the cylinder standing on end as shown. New refrigerant R410A cannot be used for earlier models 1. Compressor specifications are different. If recharging a R22 or R407C
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 6
    1-27 14. Current Protection 1-28 15. Low Oil Alarm 1-29 16. Pressure Sensor Failure 1-30 17. Backup Operation 1-31 18. Service Maintenance Functions 1-33 19. Other Functions 1-36 Section 2: OUTDOOR UNIT REPAIR PROCEDURES 2-1 1. Removing Panels 2-2 2. Removing Electrical Component Box and
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 7
    Section 4. REMOTE CONTROLLER FUNCTIONS 4-1 1. Simple Settings Function 4-2 2. Detailed Settings Function 4-4 3. Remote Controller Servicing Functions 4-15 Section 5. TROUBLE DIAGNOSIS 5-1 1. Contents of Remote Controller Switch Alarm Display 5-2 2. Outdoor Unit Control Panel LED Display
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 8
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 9
    Control 1-26 13. Discharge Temperature 1-27 14. Current Protection 1-28 15. Low Oil Alarm 1-29 16. Pressure Sensor Failure 1-30 17. Backup Operation 1-31 18. Service Maintenance Functions 1-33 19. Other Functions 1-36 1 - 1
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 10
    except the unit that is set as unit No. 1. Therefore no problems will result even if the system address, No. of indoor units, made at the other units. However, making these settings may be convenient for manual backup operation, as it eliminates the necessity of making the settings again if unit
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 11
    2. Selecting an Outdoor Unit for Operation 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 12
    3. Compressor Control 3-1. Compressors Mounted in the Outdoor Units [U-72MF1U9, U-72MF1U9E, U-96MF1U9, U-96MF1U9E] Capacity 72 96 Installed Compressor 1 compressor Compressor 2 Rotary Scroll DC Inverter DC Inverter - 5 hp 1 hp = horsepower Constant INV speed INV 3-WAY VRF SYSTEM
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 13
    3. Compressor Control 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 14
    , etc.) For this reason, vapor may be discharged if the test run continues for a long period of time, however this does not indicate a problem. In addition, the test run is canceled automatically after 1 hour. (2) Even within the same area, the compressor capacity varies depending on the refrigerant
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 15
    3. Compressor Control 3-WAY VRF SYSTEM Control Functions 3-6-2. Condensation Temperature (Tc) Control: Control when there are indoor units operating in Heating mode PX = 125.6 ˚F Thermostat OFF Area D PX -0.1 Horsepower decrease Area C 118.5 118.4 Horsepower increase prohibited Area B 118
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 16
    Low Evaporation Temp. [Te] High 3. Compressor Control Compressor Control Table Low Condensation Temp. [Tc] A B C A UP not_UP 1 B slow_UP Target C not_UP DOWN 3-WAY VRF SYSTEM Control Functions High D STOP Evaporation temperature (Te) and condensation temperature (Tc) areas A, B,
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 17
    3. Compressor Control 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 18
    4. Special Controls 3-WAY VRF SYSTEM 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,
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 19
    4. Special Controls 3-WAY VRF SYSTEM 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.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 20
    4. Special Controls 3-WAY VRF SYSTEM 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.) →
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 21
    4. Special Controls 3-WAY VRF SYSTEM Control Functions 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 22
    4. Special Controls 3-WAY VRF SYSTEM Control Functions 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. (1) Description of outdoor unit cycle defrost With this defrost method, when 1 outdoor unit
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 23
    4. Special Controls 3-WAY VRF SYSTEM 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 42.8°F or higher at all temperatures sensors installed on the outdoor unit heat exchangers
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 24
    2 Sufficient There is more than an adequate amount of oil in the compressor. This is the normal operating state of the system and not a problem. 1 Slightly The compressor may contain an adequate amount of oil, but Check that oil control recovers oil. 1 low it may also contain less than
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 25
    6. Operation of Solenoid Valves 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 26
    6. Operation of Solenoid Valves 3-WAY VRF SYSTEM 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-
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 27
    3-WAY VRF SYSTEM 7. Outdoor Unit Electronic Control Valves [MOV1, MOV2, MOV4] Control Functions 7-1. Types of Electronic Control Valves [U-72MF1U9, U-72MF1U9E, U-96MF1U9, U-96MF1U9E] Capacity 72 96 Electronic control valve 1 Heat exchanger 1 valve Heat exchanger 1 valve Electronic control
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 28
    3-WAY VRF SYSTEM 7. Outdoor Unit Electronic Control Valves [MOV1, MOV2, MOV4] Control Functions 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 29
    8. Outdoor Fan Control 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 30
    9. Demand Control 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 31
    10. Indoor Unit Control of the Electronic Control Valve 3-WAY VRF SYSTEM Control Functions 10-1. Normal Control (1) Cooling operation Position of electronic control valve Outdoor unit operating Outdoor unit stopped Stopped 20 20 Fan 20 20 Cooling Thermostat OFF Thermostat ON 20
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 32
    10. Indoor Unit Control of the Electronic Control Valve 3-WAY VRF SYSTEM Control Functions 10-2. Special Control Control Operating mode Subject indoor units Position of electronic control valve Tube refrigerant oil recovery control Cooling Heating All indoor units All indoor units Fixed
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 33
    11. Solenoid Valve Kit Control 3-WAY VRF SYSTEM Control Functions This device connects the solenoid valve kit which is used to switch between indoor unit cooling/heating for 3-WAY types. Operation of the except type E1 solenoid valve kit Stopped Discharge valve OFF Intake valve OFF Balance
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 34
    12. Indoor Special Control 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 35
    . Type Stop temp. Start-prohibit temp. Alarm display Compressor 1 Inverter 222 194 P03 Compressor 2 Constant-speed 222 194 P17 (2) Discharge sensor trouble detection control An alarm occurs if the discharge temperature remains abnormally high when the system has been stopped for 60 minutes. * In
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 36
    27.3 List of Alarms Compressor No. Detected current Alarm display Compressor 2 Overcurrent H11 Lock current H12 (4) CT circuit detection trouble Compressor 1 (inverter compressor) Compressor 2 (constantspeed compressor) Alarm H03 H13 Description Occurs when an open CT circuit is detected in
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 37
    15. Low Oil Alarm 3-WAY VRF SYSTEM 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.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 38
    occur before operation of the high-pressure switch. Therefore, before concluding that there is a failure in the 1 pressure sensor, first verify that the service valve was not accidentally left closed, that there are no blocked cir- cuits, and that there is no leakage of refrigerant into stopped
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 39
    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. Automatic backup mode is not engaged in cases
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 40
    an outdoor unit other than the unit where the alarm occurs. In this case, because the outdoor unit service valve must be closed, backup operation must be performed manually. (1) Backup operation procedure [1] Disconnecting the failed outdoor unit 1 (A) Reduce the number of outdoor units set at
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 41
    18. Service Maintenance Functions 3-WAY VRF SYSTEM Control Functions The outdoor unit EEPROM settings can be used for the following functions. 18-1. Outdoor Unit Noise Countermeasure: EEPROM
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 42
    18. Service Maintenance Functions 3-WAY VRF SYSTEM Control Functions 18-5. Automatic Backup Mode: Outdoor EEPROM 49 (set only on outdoor unit No. 1) Two types of automatic backup
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 43
    18. Service Maintenance Functions 3-WAY VRF SYSTEM Control Functions 18-9. Compressor operating sequence: Outdoor EEPROM 46 (set at outdoor units which include CCU functions) When this setting
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 44
    19. Other Functions 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 45
    19. Other Functions 3-WAY VRF SYSTEM Control Functions (3) Outdoor unit PCB LED indications in judgment mode LED1 LED2 Recommended response Judgment mode Blinking Blinking Normal ON ON Insufficient gas Blinking OFF Charge with refrigerant a little at a time. Overcharge OFF Blinking
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 46
    - MEMO - 1 - 38
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 47
    Contents 3-WAY VRF SYSTEM Outdoor Unit Repair Procedures 2. OUTDOOR UNIT REPAIR PROCEDURES 1. Removing Panels 2-2 2. Removing Electrical Component Box and Duct 2-3 3. Discharging Compressor Oil 2-5 4. Backup Operation 2-6 5. Recovering Refrigerant 2-9 6. Checking for Leakage After
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 48
    1. Removing Panels 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 49
    2. Removing Electrical Component Box and Duct 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 50
    2. Removing Electrical Component Box and Duct (7) Remove the lower duct. (2 screws, 1 tab) (Fig. 2-6) 3-WAY VRF SYSTEM Outdoor Unit Repair Procedures Lower duct 2 (8) Remove the upper duct. (3 screws) (Fig. 2-7) Fig. 2-6 Upper duct Fig. 2-7 2 - 4
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 51
    3. Discharging Compressor Oil 3-WAY VRF SYSTEM 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. Discharging
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 52
    during the period after trouble occurs until repairs are made. However, during repair and at other times, use manual backup operation. 4-1. Settings at the failed outdoor unit No particular changes However, close all service valves (suction tube, discharge tube, liquid tube, balance tube) at
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 53
    unit must be set as the No. 1 unit (main unit). • Settings at the failed No. 1 outdoor unit - No particular changes - However, close all service valves (suction tube, discharge tube, liquid tube, balance tube) at the failed outdoor unit, and disconnect the wiring between the outdoor units (main-sub
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 54
    4. Backup Operation 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 55
    of the outdoor unit beforehand (at power mains). (2) Fully close each service valve on the suction tube, discharge tube, liquid tube, and the balance the recovery cylinder and methods used for recovery, follow the specific instructions that came with the refrigerant recovery unit. (5) Locate the AP
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 56
    must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit. START 5-2-1. Cooling operation (for all valve Ready for normal operation END END ★ Service work performed on indoor units is done simultaneously using the service ports at the liquid (narrow tube)
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 57
    been provided in the indoor unit as shown in Fig. 2-10, follow the instructions given in (2) through (6) below. If the service port is instead located in the outdoor side, follow the instructions in "5-2-3. Refrigerant recovery procedures (2)." (2) After running the unit in Cooling mode for about
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 58
    tube Manifold gauge Service port Solenoid valve kit where pump down will be performed. ➂ Follow the instructions in "5-2-1. Cooling operation (for all units)" and operate SCT connector is pulled out, immediately alarm F12 (sensor trouble) occurs and all outdoor units stop operating. Be sure
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 59
    recovery unit. NOTE To determine the completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit. Discharge tube service port (For 5/16" (7.94mm)-dia. connector) 2 Liquid tube service port (For 5/16" (7.94mm)-dia. connector) Manifold gauge Lo Hi
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 60
    out the following leakage check. (1) Check that all service valves for suction tube, discharge tube, liquid tube, be used to shield the unit in case of rain. If no problem is found, purge all nitrogen from the system. Manifold gauge Lo Hi Instructions" that came with the outdoor unit. 2 - 14
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 61
    Repaired Outdoor Unit (1) Check that each service valve of the suction tube, discharge tube in the refrigerant circuit and causing operating problems. Therefore, never skip this step. (5) ensure proper evacuation, refer to the operating instructions that came with the vacuum pump. Vacuum pump
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 62
    circuit for refrigerant, connect it to the suction line service port carefully to avoid releasing refrigerant into 2 the atmosphere the vacuum pump. CAUTION To ensure proper evacuation, refer to the operating instructions that came with the vacuum pump. Vacuum pump Manifold gauge Lo Hi
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 63
    push-to-release valve) to the upper valve via the manifold gauge valves (at Hi-pressure gauge side). In addition, connect the suction line service port (with push-to-release valve) to the DPR (Discharge Pressure Regulator). Carry out the connection work quickly to avoid letting air enter. CAUTION
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 64
    Procedure 1: Open the Hi-side manifold gauge valve Lower valve Suction tube service port (For 5/16" (7.94mm)-dia. connector) Connect from here to the other end of the tube into the oil container. (2) Follow the instructions in "7. Evacuating System," and apply vacuum to the outdoor unit to be
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 65
    8. Charging Compressor Oil 3-WAY VRF SYSTEM Outdoor Unit Repair Procedures Oil tube service port (For 1/4" (6.35mm)-dia. connector) High-pressure outlet port (For 5/16" (7.94mm)-dia. connector) Oil Low-pressure outlet port (For 5/16" (7.94mm) -dia. connector) Manifold
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 66
    tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve. (7) When the low pressure at the outdoor unit to be repaired reaches 72.5 psi completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit. 2 - 20
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 67
    tube and balance tube on the outdoor unit to be repaired. Then slowly close the liquid tube service valve. (10) When the low pressure at the outdoor unit to be repaired reaches 72.5 psi completion of refrigerant recovery, follow the instructions that came with the refrigerant recovery unit. 2 - 21
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 68
    unit High-pressure outlet port Low-pressure outlet port (For 5/16" (7.94mm-dia. (For 5/16" (7.94mm-dia. connector) connector) Liquid tube service port (For 5/16" (7.94mm-dia. connector) 2 Connect from here to refrigerant recovery unit Fig. 2-20 Refrigerant recovery cylinder Measuring scale
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 69
    classified into the following categories. (1) Mechanical trouble → (A) Locking (intrusion of foreign . 300 MΩ (b) Compressor → Min. 100 MΩ (servicing part) (c) Unit → Min. 10 MΩ (This is failed compressor motor? NO YES Follow the instructions in "3. Discharging Compressor Oil" and drain
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 70
    fully open all valves on the suction tube, discharge tube, liquid tube, and balance tube. (7) If backup operation was engaged, follow the instructions in "4. Backup Operation" and perform backup operation recovery. (8) If charging with an amount of new refrigerant equal to the amount of recovered
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 71
    refrigerant a little at a time in order to prevent liquid back-flow. (9) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in "8. Charging Compressor Oil," and charge with the necessary amount of oil. Also add an amount of oil that is equivalent to the amount
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 72
    a little at a time in order to prevent liquid back-flow. (10) Fully close the low-pressure gauge valves on the manifold gauge, follow the instructions in "8. Charging Compressor Oil," and charge with the necessary amount of oil. Also add an amount of oil that is equivalent to the amount that
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 73
    connector is pulled out, alarm F12 (sensor trouble) immediately occurs and all outdoor units stop a refrigerant recovery device to the liquid tube service port (Schrader-type valve) of all outdoor units is compete, follow the instructions in the instruction manual of the refrigerant recovery device
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 74
    SYSTEM Outdoor Unit Repair Procedures (15) At all outdoor units where dry cores were removed, pressurize with 522.1 psi of nitrogen from the liquid tube service port and check for leaks. (16) After evacuating all nitrogen gas from the tubing, apply vacuum to all outdoor units where dry cores were
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 75
    be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement in the outdoor unit tubings. (2) Follow the instructions in "1. Removing Panels" and "2. Removing Electrical Component Box and Duct" and remove the corresponding parts from the outdoor unit where
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 76
    manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement. (10) Perform copper brazing at the 2 welding locations. (11) Follow the instructions in "6. Checking for Leakage After Repair" and check for leaks at the outdoor unit where the compressor was replaced. CAUTION At this
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 77
    unit where the compressor will be replaced. Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement. (2) Follow the instructions in "1. Removing Panels" and "2. Removing Electrical Component Box and Duct" and remove the corresponding parts from the outdoor unit where
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 78
    10. Compressor 3-WAY VRF SYSTEM Outdoor Unit Repair Procedures ■ Installation (1) Remove the 2 brazed tube caps (2 pieces) from the compressor. (2) 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 79
    3 locations) Protect the oil equalizer tube connectors Cushioning 2 rubber guide Fig. 2-28 Front view (6) Set the remaining cushioning rubber . It must be protected and do not lose it. (11) Follow the instructions in "6. Checking for Leakage After Repair" and check for leaks at the outdoor
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 80
    remove the compressors. * There is no predetermined sequence for removal; any compressor may be removed first. ■ Installation (1) Follow the instructions in "(A) Replacing the inverter compressor," "(B) Replacing the constant-speed compressor," and remove the compressors. * There is no predetermined
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 81
    pressure sensor connection port on the outdoor unit employs a Schrader-type valve. 2 11-2. Removing the Low Pressure Sensor (1) Follow the instructions in "1. Removing Panels" and "2. Removing Electrical Component Box and Duct " and remove the corresponding components from the outdoor unit where
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 82
    , then remove the right side panel of the unit. (2) Follow the instructions in "9. Pumping Out Refrigerant from Outdoor Unit", recover the refrigerant of the be checked for gas leakage and perform system evacuation. (6) Fully open service valves on the outdoor unit. However, if only one outdoor unit
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 83
    3-WAY VRF SYSTEM Outdoor Unit Repair Procedures 12-2. When the replacement is not available from the right side of the unit (1) 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 84
    - MEMO - 2 - 38
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 85
    Contents 3-WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3. OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 1. Overview 3-2 2. Functions 3-3 3. Ordinary Display Controls and Functions 3-4 4. Monitoring Operations 3-9 5. Outdoor Unit Alarm History Monitor 3-11 6. Mode Settings 3-12 3
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 86
    -unit control wiring Remote controller Ass'y Outdoor unit control PCB Indoor unit Indoor unit Operation manual included in package. Remote controller Remote controller ● The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller to the
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 87
    2. Functions 3-WAY VRF SYSTEM 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 •
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 88
    to the outdoor unit PCB. The connection is shown in the figure below. RC (3P, BLU) PCB connector (3P, BLU) Outdoor unit PCB Special service checker wiring Relay connector (2P, WHT) Remote controller Ass'y 3 ● If the communications line in the inter-unit control wiring is connected, it can be
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 89
    3-WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ● All units start/stop (Fig. 3-1) The (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. •
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 90
    3-WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller ■ Display (functions) • Use the temperature setting and buttons to change the item code. Item code Item ➀ Outdoor unit alarm ➁ No. of connected indoor units Unit Nos. of connected indoor
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 91
    3-WAY VRF SYSTEM 3. Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller (3) XX-YY R.C. Displays the outdoor unit sub-bus address which is currently selected. XX = Outdoor system address on main bus line (1 - 30) YY = Outdoor unit sub-bus address (1 - 8). "1" appears
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 92
    3-WAY VRF 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 ( the colon. ) display and ● Display
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 93
    4. Monitoring Operations 3-WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller Display the indoor unit and outdoor unit sensor temperatures. ➀ Press and hold the (CHECK) button and buttons simultaneously for 4 seconds or longer to switch to temperature monitor mode
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 94
    4. Monitoring Operations ■ Display of unit No. 1 (main unit) DN Description Intake temp. °F E1 °F E2 °F E3 °F Discharge temp. °F Discharge temp. setting °F Indoor unit electronic control valve position STEP Discharge temp. 1 °F Discharge temp. 2 °F High-pressure sensor temp. °F
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 95
    5. Outdoor Unit Alarm History Monitor • 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. ➀ Press and hold the (CHECK) button and
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 96
    6. Mode Settings ■ Setting mode 1 ➀ Press and hold the (CHECK) button and (VENTILATION) button simultaneously for 4 seconds or longer. ➁ Use the temperature setting and buttons to change the item code. The item codes and setting data are shown in the table below. ➂
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 97
    6. Mode Settings 3-WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller ■ Setting mode 2 ➀ Press and hold the (CHECK) button, simultaneously for 4 seconds or longer. button, and button ➁ Use the temperature setting and buttons to change the item code. The item
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 98
    - MEMO - 3 - 14
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 99
    Contents 3-WAY VRF SYSTEM Remote Controller Functions 4. REMOTE CONTROLLER FUNCTIONS 1. Simple Settings Function 4-2 2. Detailed Settings Function 4-4 3. Remote Controller Servicing Functions 4-15 4 4 - 1
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 100
    1. Simple Settings Function • This allows the filter lifetime, operating mode priority change, central control address, and other settings to be made for an individual or groupcontrol indoor unit to which the remote controller used for simple settings is connected. When simple settings mode is
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 101
    1. Simple Settings Function 3-WAY VRF SYSTEM Remote Controller Functions List of Simple Setting Items Item code Item Filter sign ON time (fitlter life time) Degree of filter fouling Central control address No. 0000 0001 0002 0003 0004 0005 0000 0001 0001 0002 0003 Not displayed Setting data
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 102
    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. When detailed settings mode is engaged, operation stops at the
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 103
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions List of Detailed Setting Items Item code Item No. Description 0000 1-Way Cassette (D1) Type 0006 High Static Pressure Ducted (E1) 0010 Floor Standing (P1) Setting data No. Description No. Description 0001 4-
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 104
    78°F 80°F (Upper limit at shipment) Normal Ignore heat exchanger temperature conditions. Filter input (differential pressure switch input) Alarm input (for trouble input about air cleaner or similar device) Humidifier input (Operates linked with drain pump when humidifier is ON.) Present (Setting at
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 105
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions Item code Item Automatic drain pump operation No. 0000 0001 Setting data Description No forced operation Forced operation for 1 minute Ventilation fan operation Wired remote controller sensor "Operation change control
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 106
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions Item code Item Fan tap setting (Fan tap change in order to prevent drop in air discharge caused by filter installation) Humidifier ON time (ON time per 60 seconds) Repeat timer switching Timer function change prohibit No.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 107
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions Simple setting items Item code Item 01 Filter sign ON time setting (filter lifetime) 02 Degree of filter fouling Description Changes the indoor unit filter lifetime when a high-performance filter or other optional
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 108
    Central control address Operating mode priority change Description Set when using a central control device. Used when setting the central control address manually from the remote controller. Note (1) NOTE (1) Explanation of operation mode priority change Enabled only in 2WAY VRF heat-pump models
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 109
    2. Detailed Settings Function 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 110
    unit) address Indoor unit address Group address 17 Cooling intake temperature shift Description Set when the indoor unit EEPROM memory is replaced during servicing. These are not set at the time of shipping from the factory. These must be set after installation if automatic address setting is
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 111
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions Item code Item Description 1F (Upper limit) 20 (Lower limit) Cooling 21 (Upper limit) 22 (Lower limit) 23 (Upper limit) 24 (Lower limit) Change to the remote control temperature setting range Heating Drying This
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 112
    2. Detailed Settings Function 3-WAY VRF SYSTEM Remote Controller Functions (Continued from previous page) Item code Item 3C Heat exchanger temperature for cold air discharge 3d Fan output switching 3E Drain pump delayed start time Description The heat exchanger temperature control point
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 113
    temperature display Temperature display from each sensor Press and hold the and buttons for 4 seconds or longer. Current operation is maintained. Servicing check Alarm history display display Filter lifetime, operating mode Press and hold the and buttons for 4 seconds or longer. Press
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 114
    3. Remote Controller Servicing Functions Test Run Function Operates the unit with the thermostat forced ON. ➀ Press and hold the longer. button for 4 seconds or ➁ "Test" appears on
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 115
    and buttons simultaneously for 4 seconds or longer. ➁ The unit No. "X-X" (main unit No.), item code "XX" (sensor address), and servicing monitor " " (sensor temperature) are displayed on the remote controller LCD display. (See Fig. 4-4 at right.) ➂ Press the temperature setting / buttons
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 116
    3. Remote Controller Servicing Functions 3-WAY VRF SYSTEM Remote Controller Functions Indoor unit sensors 02 Intake temp. 03 E1 04 E2 05 E3 06 Discharge temp. 07 Discharge temp.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 117
    Contents 3-WAY VRF SYSTEM Trouble Diagnosis 5. TROUBLE DIAGNOSIS 1. Contents of Remote Controller Switch Alarm Display 5-2 2. Outdoor Unit Control Panel LED Display 5-4 3. Remote Controller Servicing Functions 5-5 4. 3-WAY VRF Alarm Codes 5-7 5. Blinking Inspection Display on the Remote
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 118
    1. Contents of Remote Controller Switch Alarm Display Possible cause of malfunction 3-WAY VRF SYSTEM Trouble Diagnosis ON: Blinking: OFF: Wired remote control display Wireless remote controller receiver display Operation Timer Standby for heating Serial communication errors Mis-setting Remote
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 119
    Outdoor unit fan trouble DCCT, ACCT overcurrent (80 Hz or more) Start failure caused by compressor wire missing phase, DCCT failure, or similar problem (INV compressor start failure). Failure of nonvolatile memory IC (EEPROM) on indoor unit control PCB F04 F05 F08 F07 Operating and timer
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 120
    2. Outdoor Unit Control Panel LED Display 3-WAY VRF SYSTEM Trouble Diagnosis ( : ON : Blinking : OFF) LED (RED) 1 2 (Both ON) (OFF) (ON) (Both OFF) Display meaning After the power is turned ON (and automatic address setting is
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 121
    X - X (main unit No.), item code XX (sensor address), and service monitor 00XX (sensor temperature). (See figure at right. ➁) ➂ Press the The other parts remain unchanged during normal operation. 3-WAY VRF SYSTEM Trouble Diagnosis 2 3 5 1 4 CZ-RTC2 Example : Unit No. : Item code (
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 122
    3. Remote Controller Servicing Functions 3-WAY VRF SYSTEM Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor is installed address Sensor type Remote controller temperature Indoor unit Indoor unit intake temperature Indoor unit
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 123
    2 CT sensor disconnected or short-circuit H15 Compressor 2 discharge temperature sensor disconnected H27 Compressor 2 oil detection sensor (connection) trouble H31 HIC trouble alarm 5-17 5-17 5-18 5-19 5-20 5-21 5-18 5 5-18 5-21 5-21 L04 Outdoor system address duplication L10
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 124
    switch activated P05 Reverse phase (or missing phase) detected P16 Compressor 1 (INV) overcurrent P17 Compressor 2 discharge temperature trouble P22 Fan motor trouble P26 Inverter compressor high-frequency overcurrent alarm P29 Inverter compressor missing phase or lock alarm Blinking
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 125
    serial connector," "no terminal unit set," or other trouble that occurs before initial communications are completed. If initial control wiring between indoor units has been cut. (1) Refer to the test run servicing materials and check the indoor unit quantity setting SW (S004, 5 S005). (2)
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 126
    3-WAY VRF Alarm Codes 3-WAY VRF SYSTEM Trouble Diagnosis E16 Alarm Alarm code Alarm meaning Alarm number set. (2) The inter-unit control wiring is wired incorrectly. (1) Refer to the test run servicing materials and check the number of indoor units that is set. (2) Check the inter-unit control
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 127
    4. 3-WAY VRF Alarm Codes 3-WAY VRF SYSTEM Trouble Diagnosis E25 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes E25 Outdoor unit address setting failure (duplication) Communication by outdoor
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 128
    is used. Check: • Wiggle the sensor and check whether the trouble continues. • Check whether the connector is partially disconnected from the are normal. Step 2: If an abnormality was found at Step 1, connect the problem compressor sensor to the other compressor connector on the PCB, or to the PCB
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 129
    checking the above, then it is possible that electrical noise is the cause of the trouble. It is necessary to provide a line filter or carry out other noise countermeasures. purpose of this alarm is to facilitate identification of the problem in this case. F06, F23 Alarm Alarm code Alarm meaning
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 130
    Diagnosis F08 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes F08 Outdoor air temperature sensor trouble (1) A/D step is 10 steps or less (short circuit). (2) A/D step is 1014 steps or more (open circuit) (1) Sensor malfunction (including connector
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 131
    10kΩ indicates a short circuit or other trouble. Resistance of 10kΩ - 200kΩ is normal. Resistance liquid temperature. (2) Failure to open the service valve, clogged tubing, valve leakage, over . A normal PCB is needed to determine whether the problem is a PCB failure or a pressure sensor malfunction.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 132
    PCB. (3) Correct the locations of problems in the refrigeration cycle. • Correct (Adjust the amount of refrigerant). ∗ Guide for over-charging Be sure to connect . This alarm may result when the service valve is closed or when valve leakage -volatile memory (EEPROM) trouble (1) Non-volatile memory is
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 133
    (use caution), check that compressor noise will not occur or the compressor will not run with a groaning sound. (2) CT circuit failure, PCB failure Trouble: Check: • Check for poor connector contact. • Check the continuity of the CT circuit. • Install a normal CT in place of this CT and check
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 134
    checking the above, then it is possible that noise is the cause of the trouble. It is necessary to connect a PC or other instrument. (1) Replace the CT circuit. (2) Replace the outdoor unit PCB. (3) Correct the problem. (1) The connector was not inserted after the PCB was replaced. Use a normal CT
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 135
    WAY VRF SYSTEM Trouble Diagnosis H06 Alarm pressure is unlikely to increase. Check (1) Check that the service valve is open. (2) Check that none of the valves install a strainer or dry core (depending on the degree of the problem). (3) If refrigerant has leaked into stopped sub units, it is
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 136
    4. 3-WAY VRF Alarm Codes 3-WAY VRF SYSTEM Trouble Diagnosis H07 Alarm Alarm code Alarm meaning Alarm conditions H07 No-oil alarm This alarm occurs when oil does not flow for a specified amount
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 137
    5. - H31 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check H31 HIC trouble alarm 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 138
    4. 3-WAY VRF Alarm Codes 3-WAY VRF SYSTEM Trouble Diagnosis L04 Alarm Alarm code Alarm meaning Alarm conditions Probable cause Check Correction Example Notes L10 Alarm Alarm code Alarm meaning Alarm conditions Probable cause
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 139
    heat for a valve failure). • Ice is growing on the lower parts of some outdoor unit heat exchangers but not on others. Because this trouble may occur even in outdoor units with a high operating rate under conditions of insufficient gas, caution is needed. (6) Sensor failure Check: • This
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 140
    VRF SYSTEM Trouble Diagnosis Correction Example Notes (1) Replace the sensor. (2) Replace the outdoor unit PCB. (3) Correct the problem locations. Failure of the check valve in the compressor discharge tube. (2) The service valve is closed. (3) Clogging of the outdoor heat exchanger during cooling.
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 141
    when an instantaneous secondary current of 48 A or higher is detected. There is a strong possibility of a compressor failure. An alarm occurs for current detection trouble when it is judged that no current is flowing after start (DCCT is damaged). In this case, the cause is a DCCT failure. Check the
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 142
    or H31 has occurred, check the alarm history then refer to the corresponding items. Correction Follow the instructions in the corresponding items to correct the trouble. Recovery After repairing the malfunctioning locations, reset the power for the system (all outdoor units). Caution: Automatic
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 143
    . In an AC circuit the magnet SW should open instantaneously as long as the current is within the allowable range. However, this kind of trouble can occur if excessive current flows, and may prevent the SW from opening. (2) CT circuit failure or PCB failure (A/D failure) • CT circuit contact
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 144
    6. Inspection of Parts 3-WAY VRF SYSTEM Trouble Diagnosis (1) High-pressure switch (63PH1, 63PH2) • 63PH1: Disconnect the CN042 connector (3P, WHT) the current. The current is normal if the result is 0.15 A or higher. (As a guide, the current should be 0.14 A (180 V) - 0.17 A (220 V).) 5 5 - 28
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 145
    7. Test Pin 3-WAY VRF SYSTEM 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
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 146
    Heat Exchanger temperature sensor [E1, E3] 40 35 30 Resistance 25 20 15 5 10 5 0 -20 -15 -10 -5 0 5 10 15 20 Temperature (˚C) Resistance 3-WAY VRF SYSTEM Trouble Diagnosis 8 7 6 5 4 3 2 1 0 20 30 40 50 60 Temperature (˚C) 5 - 30
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 147
    8. Thermister Characteristics Curve 3-WAY VRF SYSTEM Trouble Diagnosis 8-3. Outdoor temp. sensor, Compressor suction gas temp. sensor Outdoor heat exch. coil sensor, Oil temp. sensor Resistance Resistance Outdoor temperature, Suction gas temperature sensor
  • Panasonic WU-144MF1U9E | 3-Way Service Manual - Page 148
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Outdoor Units
Refrigerant R410A is used in the outdoor units.
96
72
Class
Model Name
U-72MF1U9
U-96MF1U9
U-72MF1U9E
U-96MF1U9E
85464849301000
REFERENCE NO.
SM830201-00
Indoor Units
*
*
3WAY VRF SYSTEM
U-72MF1U9
U-96MF1U9
U-72MF1U9E
U-96MF1U9E
*
*
* Salt-Air Damage Resistant Specifications.
**
Necessary to install the External Electronic Expansion Valve Kit (Optional:CZ-P56SVK1U).
SERVICE MANUAL
Model No.
Class
9
12
15
18
24
19
36
54
48
7
S-07MD1U6
S-07MF1U6
S-07MM1U6
S-07MK1U6
S-07MP1U6
S-07MR1U6
S-09MD1U6
S-09MF1U6
S-09MM1U6
S-09MK1U6
S-09MP1U6
S-09MR1U6
S-12MU1U6
S-12MY1U6
S-12MD1U6
S-12MF1U6
S-12MM1U6
S-12MT1U6
S-12MK1U6
S-12MP1U6
S-12MR1U6
S-15MF1U6
S-15MM1U6
S-15MP1U6
S-15MR1U6
S-18MU1U6
S-18MY1U6
S-18MF1U6
S-18MM1U6
S-18MT1U6
S-18MK1U6
S-18MP1U6
S-18MR1U6
S-19MS1U6**
S-24MU1U6
S-24MF1U6
S-24MT1U6
S-24MK1U6
S-24MP1U6
S-24MR1U6
S-36MU1U6
S-36MF1U6
S-36ME1U6
S-48MF1U6
S-48ME1U6
S-54MF1U6
M1
Y1
F1
U1
D1
T1
E1
P1
R1
K1
4-Way Cassette
1-Way Cassette
Low Silhouette Ducted
Ceiling
Wall Mounted
Concealed Floor
Standing
Floor Standing
4-Way Cassette 60×60
Slim Low Static Ducted
High Static Pressure
Ducted