Service manual

19
Ok
Do you hear "click" from the
solenoid valve coil
?
No
Yes
After 1minute or more has passed since the
compressor started, operate the solenoid valve coil
by heating or cooling the ambient temperature
thermistor.
(Refer to Solenoid valve control.)
Turn ON the power supply.
Operate the unit in COOL mode by pressing
the EMERGENCY OPERATION switch.
Yes
Check of the
solenoid valve coil.
(Refer to 8-3.)
Is there 220-230V AC
CN722 on the deicer
P.C. board?
Replace the
deicer P.C. board.
No
Turn ON the
solenoid valve coil.
(Refer to Solenoid
valve control.)
Check of solenoid valve coil
F
Outdoor unit repeats start and stop.
Solenoid valve control
The solenoid valve opens when the ambient temperature thermistor RT63 temperature reaches 49.2: or more after 1
minute has passed since the compressor turned on. Then, the solenoid valve maintains to open until the ambient tem-
perature thermistor RT63 temperature falls 46.2: or less.
NOTE: The solenoid valve remains to close when the ambient temperature thermistor RT63 temperature is 49.2: or
less after 1 minute has passed since the compressor turned on.
ON
OFF
46.2:49.2:
Ambient temperature thermistor
RT63 temperature
Solenoid valve
MU-A30ND
OB405E.qxp 09.10.14 9:16 AM Page 19