Panasonic 2WAY Multi - Page 110

IV–97
9
Water heat
exchanger
unit’s motor-
operated
valve check
9-1
Check the motor-operated valve on the water heat exchanger
unit. Does the valve open? (Check the temperature of the
water heat exchanger unit’s coil in the heating mode.)
Yes 10 -1
No 9-2
9-2
Check the water heat exchanger unit’s control board. (Is there
any voltage between No. 5 (+) and No. 1-4 (-) and between
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?)
Yes 9- 3
No
Replace the
water heat
exchanger unit’s
control board
9-3
Check the motor-operated valve. (Does a resistance of
approximately 46 Ω exist between No. 5 and 1-4 of the motor-
operated valve connector 6P-1 (white)?)
Yes
Replace the
valve
No
Replace the
valve coil
10
Water heat
exchanger
unit’s coil
sensor
10-1
Are coil sensors TH1 to 3 on the water heat exchanger unit
disconnected from the measurement points? Check this by
displaying the temperature of the water heat exchanger unit’s
coil on the outdoor unit.
Yes Repair
No 11-1
11
Outdoor
unit’s motor-
operated
valve check
11-1
Check the outdoor unit’s motor-operated valve.
Coil resistance: 46 Ω (between No. 5 (+) and No. 1 to 4 (-)),
32 Ω for 3WAY
OK 12-1
NG Replace
12
High
pressure
sensor
12-1 Check the high pressure sensor.
OK 13-1
NG Repair
13
Bypass
valve
13-1
Is the bypass valve operating normally? (Wiring and coil unit.)
Coil resistance: 46 Ω (between No. 5 (+) and No. 1 to 4 (-))
Yes 14 -1
No Replace
14
Engine
14-1 Is the engine throttle sticking?
Yes Repair
No
Inspection
needed
15
Outdoor
unit’s
solenoid
valve check
(in the case
of 3WAY)
15-1
Measure the tube temperature around the solenoid valve
in the trial run mode to check that the solenoid valves are
operating normally in each operation mode (cooling/heating).
(For details on solenoid valve operations in each operating
mode, see the section explaining the control functions through
to operation control in the “Outdoor Unit Manual.”) Are the
solenoid valves operating normally?
Yes
Replace the
outdoor unit’s
main board
No 15-2
15-2
Check the outdoor unit’s power board.
Is the outdoor unit’s power board CN013 outputting the
solenoid power supply voltage (AC 200 V)?
Yes 15 -3
No
Replace the
outdoor unit’s
power board
15-3
Are there any poor connections or severed wires in the wiring
between the outdoor unit’s power board and relay board?
Yes Repair wiring
No 15-4
15-4
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
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).
Yes 15 -5
No
Replace the
outdoor unit’s
main board
GHPtroubleshooting.indbIV‒97GHPtroubleshooting.indbIV‒97 2012/11/2611:20:152012/11/2611:20:15