– 206 –
(*2) Checking the oil return circuit from oil separator and clogging in
SV3D valve
a) Oil return circuit
• While outdoor unit is operating, check temperature (secondary side of capillary) on oil return circuit.
((6) in the figure.)
If temperature is low equivalent to suction temperature), a clogging of strainer of oil return circuit or
capillary is considered. Replace the clogged part.
b) Clogging check for SV3D valve
• While outdoor unit is operated, set up SW01/02/03 = [2] [1] [3] (7-segment display [Hr] [... ... ...]), and
push SW04 for 2 seconds or more.
• Set up SW02 = [9], and turn on SV3D valve. (7-segment display [Hr] [... 3 d])
• If temperature is low at secondary side of the valve or it does not change, clogging of valve, capillary,
or strainer is considered. ((7) in the figure.) Replace the clogged part.
(6)
(7)
(2)
(5)
(8)
(1)
(8)
(4)
Check valve
High-pressure sensor
(TD2)
(SV2)
(SV3D)
(TK2)
(SV3B)
(TK1)
(TD1)
(TK4)
(SV3E)
(TK5)
(SV42)
3
Oil header
Distributor
SV3C
SV
SV
SV
SV
SV
SV
SV
SV
(*3) Check for solenoid valve of all outdoor units in a line (For multiple
outdoor unit system)
a) Clogging check for SV3A valve
• While outdoor unit is operating, set up SW01/02/03 = [2] [1] [3] (7-segment display [Hr] [... ... ...]), and
push SW04 for 2 seconds or more.
• Set up SW02 = [6], and turn on SV3A valve. (7-segment display [Hr] [... 3 A])
• If temperature is low at secondary side of the valve or it does not change, clogging of valve or check
valve is considered. ((1) in the figure.)
b) Leakage check for SV3C valve
• While outdoor unit is operating, set up SW01/02/03 = [2] [1] [3] (7-segment display [Hr] [... ... ...]), and
push SW04 for 2 seconds or more.
• Set up SW02 = [8], and turn on SV3C valve. (7-segment display [Hr] [... 3 C])
• If temperature does not change (up), clogging of valve or strainer is considered. ((2) in the figure.)
(*4)
a) Clogging check for oil-equalization circuit
• Drive the outdoor unit. (Drive all compressors in the unit.)
• After driving for 10 minutes or more, check whether temperature of TK1, TK2 and TK3 sensors and
temperature of oil-equalization circuit capillary ((8) in the figure) has increased.
(Criterion)
TK1, TK2, TK3=Td1, Td2, Td3 temperature - Approx. 10 to 30°C
Oil-equalization capillary tubes should be higher sufficiently than outside air temperature and suction
temperature.
• If temperature is low, a malfunction on check valves or clogging of capillary, strainer or distributor is
considered. Repair the defective parts.
Oil separator
High-pressure
SW
High-
pressure
SW
Check
valve
Check
valve
Check valve
Check valve
Check valve
Check
valve
Compressor
1
(Inverter)
Compressor
2
(Inverter)
MMY-MAP0804∗
MMY-MAP1004∗
MMY-MAP1204∗
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