(*1)
(*2) Checking the oil return circuit from oil separator and clogging in
SV3D valve
D
Oil return circuit
•
While outdoor unit is operating, check temperature (secondary side of capillary) on oil return
circuit.((
1
) 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.
E
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 = [
10
], 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. ((
2
) in the figure.) Replace the clogged part.
(*
3
)
D
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 sensors and
temperature of oil-equalization circuit capillary ((
3
) in the figure) has increased.
(Criterion)
TK1, TK2=T
D
1, T
D
2 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
or
strainer is
considered. Repair the defective parts.
(TD2)
(TK1)
(TD1)
SV
SV
SV
SV
(SV2)
(SV3D)
(SV42)
(SV41)
Oil separator
Accumulator
High-
pressure
switch
High-
pressure
switch
Compressor
1
Compressor
2
(TK2)
(1)
(2)
(3)
(3)
- 167 -
