06-14
19. Precautions for when replacing refrigerant-cycle-parts
Solenoid Valve 1 /2 /3 /4
Expansion Valve 1 /2 /3
4-way Valve A /B
3-way Valve (Discharge gas)
3-way Valve (Suction gas)
3-way Valve (Liquid)
Union Joint
High pressure sensor
Low pressure sensor
Pressure switch
Check Valve
(1) During replacement of the following parts shall be protected by wet rag and not make the allowable temperature or more.
(2) Remove the heat insulation when there is the heat insulation near the welding place.
Move and cool it when its detaching is difficult.
(3) Cool the parts when there are parts where heat might be transmitted besides the replacement part.
(4) Interrupt the flame with the fire-retardant board when the flame seems to hit the following parts directly.
(5) Do not allow moisture or debris to get inside refrigerant pipes during work.
(6) When brazing, be sure to replace the air in the pipe with nitrogen gas to prevent forming oxidization scale.
Part name
Allowable
temperature
Precautions in work
Remove the coil before brazing.
And install the coil after brazing.
Remove the coil before brazing.
And install the coil after brazing.
Tighten the flare part gripping it.
(Tightening torque :15 1.5N m)
Do the static electricity measures.
Remove the pressure sensor before brazing.
And install the pressure sensor after brazing.
Remove the suction temp. sensor before brazing.
And install the suction temp. sensor after brazing.
392°F
(200°C)
248°F
(120°C)
212°F
(100°C)
+
-
.
Fusible plug
167°F
(75°C)
Make sure to drape a wet rag on it.
for keeping fusible plug cool.
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