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In some cases, it may be difficult to check the leakage of clogging in the following condition of refrigerant
stagnation in low ambient temperature condition.
In this case, take a longer operating time prior to check.
(Criterion: Discharge temperature of TD1, TD2 and TD3 are 140˚F (60˚C) or higher)
(*1) Checking leakage and clogging on solenoid valves
a) Leakage check for SV3A valve (For multiple outdoor unit system)
•Turn off the power supply, take off connector of SV3A valve, and then start a test operation after
power-ON.
• Check the temperature change at secondary side of SV3A valve during operation . ((1) in the figure.)
→ If temperature is raised, leakage occurs in the SV3A valve. Replace SV3A valve.
b) Leakage check for SV3C valve
• Turn off the power supply, take off connector of SV3C valve, and then start a test operation after
power-ON.
• After operation for several minutes, check temperature at secondary side of SV3C valve. ((2) in the
figure.)
→ If temperature is high (equivalent to discharge temperature TD), leakage occurs in the SV3C valve.
Replace SV3C valve.
(Even if leakage does not occur in the SV3C valve, temperature of SV3C valve at secondary side
rises during operation. But the temperature is lower than TD when there is no leakage.)
c) Leakage check for SV3F valve (For multiple outdoor unit system)
• Turn off the power supply, take off connector of SV3F valve, and then start a test operation after
power-ON.
• Check the temperature change at secondary side of SV3F valve during operation . ((3) in the figure.)
• If temperature is raised, leakage occurs in the SV3A valve. Replace SV3A valve.
→ If temperature is raised, leakage occurs in the SV3A valve. Replace SV3A valve.
d) Clogging check for SV3B valve (For multiple outdoor unit system)
• 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 = [10], and turn on SV3A, SV3B, SV3C valves. (7-segment display [Hr] [... 3 -])
• While outdoor units are operating, check temperature change at secondary side of SV3B valve. ((4) in
the figure.)
• If temperature does not rise (equivalent to suction temperature), it is a clogging of SV3B valve.
→ Replace SV3B valve.
e) Clogging for SV3E valve
Reset the power supply.
↓
Using "Valve forced open/close function" of the outdoor unit, check ON/OFF operation (Sound, coil
surface temp up) of SV3E valve is performed.
↓
Start test operation in COOL or HEAT mode.
↓
After operation for several minutes, check the pipe temperature at the secondary side of SV3E valve
whether temperature changes or not. If it is equivalent to outside temperature, clogging of SV3E is
considered. ((5) in the figure.)
(Reference)
If SV3E valve is clogged, temperature does not change at all sensors (TK1, TK2, TK3, TK4 and TK5).
f) Clogging check for SV3F 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 = [8], and turn on SV3C, SV3E, SV3F valves. (7-segment display [Hr] [... 3 C])
• While outdoor units are operating, check temperature change at secondary side of SV3F valve. ((3) in
the figure.)
• If temperature does not rise (equivalent to suction temperature), it is a clogging of SV3F valve.
Replace SV3F valve.
(*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.
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