Clogging Check For Sv3A Valve; Clogging Check For Oil-Equalization Circuit - Toshiba Super MMU-AP0091H Service Manual

(*3) Check for solenoid valve of outdoor unit (For multiple outdoor unit system)
a) Clogging check for SV3A valve
• While outdoor unit is operating, set up SW01/02/03 = [2] [1] [3] to 7-segment display [Hr] [ 2], and push SW04
for 2 seconds or more.
• Set up SW02 = [4], and turn on SV3A valve. (7-segment display [Hr] [ 3A])
• If temperature is low at secondary side of the valve or it does not change, clogging of valve or check valve is

considered. ( in the figure.)
b) Leakage check for SV3C valve
• While outdoor unit is operating, set up SW01/02/03 = [2] [1] [3] to 7-segment display [Hr] [ 2], and push SW04
for 2 seconds or more.
• Set up SW02 = [6], and turn on SV3C valve. (7-segment display [Hr] [ 3C])
• If temperature does not change (up), clogging of valve or strainer is considered. (
(*4)
a) Clogging check for oil-equalization circuit
• Drive the outdoor unit. (Drive both compressors in the unit.)
• After driving for 10 minutes, check temperature of TK1 and TK2 sensors and temperature of oil-equalization
‡
circuit capillary (
(Criterion)
TK1, TK2=Td1, Td2 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 of capillary, strainer, or check valve is considered.
Repair the defective parts.
6
7
Balance pipe
Packed valve
in the figure) were raised.
High-pressure
sensor
5
Check joint
(SV3D)
Solenoid valve
(SV41)
High-pressure
SW
(TD1)
(TK1)
(SV3E)
4
1
Strainer
(SV2)
Oil
separator
Solenoid valve
(SV42)
High-pressure
Sensor
(TD2)
Sensor
(TK3)
Strainer Strainer
(TK2)
Oil tank
(TK4)
(SV3A)
Solenoid
valve
(SV3B)
Check
3
177
‚
in the figure.)
SW
2
7
valve