Samsung ASHM070VE, Руководство по обслуживанию, Страница: 43 / 70

Samsung Electronics
5-11
Troubleshooting
5-3-7 When the bypass solenoid valve does not operate
1) Inspection items
(1) Is the solenoid valve under the operating condition? ( When one of the B room
or C room is under the cooling operating mode)
(2) Is the power voltage normal ? (AC 198V - AC 264V)
(3) Is the connection of SV -B Y valve connector good? (CN 74)
(4) Is the coil resistance of solenoid valve both ends approx. 1.3 K
Ω
?
2) Inspection sequence
When one of indoor unit B room and C room is on
*SV by valve operating
(1) When one room of the B/C rooms is at C O M P on
→
SV - B Y : O N
(2) When two rooms of the B/C rooms are at comp on
→
SV - B Y : OFF
(3) When the C O M P B is under the defrost operating, it shall be in according to (1) and (2).(When
the Heating operation)
(4) When B comp is under the heating operating, SV - B Y is always off .
Put off the outdoor unit power and put it on again after 5 seconds.
Normal
Normal
SV bypass valve defect
→
replace
Defect of relay contact and coil.
→
Replace
Defect of Ic output
→
Replace
Defect of IC 04 (micom)
Replace the IC 04 or PCB ass'y
Only when B room is on among three rooms of indoor unit,
is the solenoid valve operating?
Is the voltage shown across the solenoid valve connector
ends(CN 74) ? (AC198V - AC 242 V)
Is the pin no. 45 of IC 04 (MICOM) at high?
Is solenoid bypass valve under the operating condition?
Is the pin no. 15 of IC 07 at low ( = DC 0.7V) ?
Y
Y
Y
Y
Y
N
N
N
.
.
N
N