Panasonic 2WAY Multi Technical & Service Manual page 110

9 Check the motor-operated valve on the water heat exchanger
Water heat 9-1 unit. Does the valve open? (Check the temperature of the
exchanger water heat exchanger unit's coil in the heating mode.)
unit's motor-
Check the water heat exchanger unit's control board. (Is there
operated
any voltage between No. 5 (+) and No. 1-4 (-) and between
valve check
9-2 No. 10 (+) and No. 6-9 (-) of the water heat exchanger unit's
control board 10P-1 (white) and 10P-2 (black) when the power
is switched on?)
Check the motor-operated valve. (Does a resistance of
9-3 approximately 46 Ω exist between No. 5 and 1-4 of the motor-
operated valve connector 6P-1 (white)?)
10
Are coil sensors TH1 to 3 on the water heat exchanger unit
Water heat
disconnected from the measurement points? Check this by
exchanger 10-1
displaying the temperature of the water heat exchanger unit's
unit's coil
coil on the outdoor unit.
sensor
11
Outdoor Check the outdoor unit's motor-operated valve.
unit's motor- 11-1 Coil resistance: 46 Ω (between No. 5 (+) and No. 1 to 4 (-)),
operated 32 Ω for 3WAY
valve check
12
High
12-1 Check the high pressure sensor.
pressure
sensor
13
Is the bypass valve operating normally? (Wiring and coil unit.)
Bypass 13-1
Coil resistance: 46 Ω (between No. 5 (+) and No. 1 to 4 (-))
valve
14
Engine
14-1 Is the engine throttle sticking?
15 Measure the tube temperature around the solenoid valve
Outdoor in the trial run mode to check that the solenoid valves are
unit's operating normally in each operation mode (cooling/heating).
solenoid 15-1 (For details on solenoid valve operations in each operating
valve check mode, see the section explaining the control functions through
(in the case to operation control in the "Outdoor Unit Manual.") Are the
solenoid valves operating normally?
of 3WAY)
Check the outdoor unit's power board.
15-2 Is the outdoor unit's power board CN013 outputting the
solenoid power supply voltage (AC 200 V)?
Are there any poor connections or severed wires in the wiring
15-3
between the outdoor unit's power board and relay board?
Check the outdoor unit's main board.
Does a drive output voltage (DC 12 V) from discharge valves
1-1, 1-2, discharge valve 2, suction valve 2-1 and 2-2 exist
with "v_open" (valve open) in the No. 4 test mode?
[9P (white) CN018]
Discharge valves 1-1, 1-2: between No. 3–9
15-4 Discharge valve 2: between No. 4-9
Suction valves 2-1, 2-2: between No. 6-9
Does suction valve 1 output a drive voltage (DC 12 V) during
cooling operations?
Suction valve 1: between No. 3-9
* Note that suction valve 1 closes when electricity is supplied
(the other solenoid valves operate in reverse).
IV–97
Yes 10-1
No 9-2
Yes 9-3
Replace the
water heat
No
exchanger unit's
control board
Replace the
Yes
valve
Replace the
No
valve coil
Yes Repair
No 11-1
OK 12-1
NG Replace
OK 13-1
NG Repair
Yes 14-1
No Replace
Yes Repair
Inspection
No
needed
Replace the
Yes outdoor unit's
main board
No 15-2
Yes 15-3
Replace the
No outdoor unit's
power board
Yes Repair wiring
No 15-4
Yes 15-5
Replace the
No outdoor unit's
main board