06-14
16. Precautions for exchange of refrigerant-cycle-parts
EXPANSION VALVE
4WAY VALVE
3WAY VALVE (GAS)
PRESSURE SENSOR
3WAY VALVE (LIQUID)
(1) During exchange 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 tra
nsmitted 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.
(7) Open the 3WAY VALVE because there is a possibility of
squirting the refrigerant from the heated pipes at brazing.
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.
120°C
SOLENOID VALVE
Remove the coil before brazing.
And install the coil after brazing.
120°C
120°C
100°C
UNION JOINT
Remove the pressure sensor before brazing.
And install t
he pressure sensor after brazing.
Remove the wiring before brazing.
And connect the wire after brazing.
100°C
100°C
PRESSURE SWITCH
100°C
+
-
.
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