Precautions For Exchange Of Refrigerant-Cycle-Parts - Fujitsu WATERSTAGE WOYG160LJL Maintenance Document

▼ Precautions for exchange of refrigerant-cycle-parts

(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 diffi cult.
(3) Cool the parts when there are parts where heat might be transmitted besides the replacement part.
(4) Interrupt the fl ame with the fi re-retardant board when the fl ame 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
SOLENOID VALVE
EXPANSION VALVE
4-WAY VALVE
3-WAY VALVE (GAS)
3-WAY VALVE (LIQUID)
UNION JOINT
PRESSURE SENSOR
PRESSURE SWITCH
- 136 -
Allowable
Precautions in work
temperature
Remove the coil before brazing.
120°C
And install the coil after brazing.
Remove the coil before brazing.
120°C
And install the coil after brazing.
Remove the coil before brazing.
120°C
And install the coil after brazing.
100°C
100°C
Remove the pressure sensor before brazing.
100°C
And install the pressure sensor after brazing.
Tighten the fl are part gripping it. (Tightening torque :15 1.5N m)
100°C
Do the static electricity measures.
Remove the wiring before brazing.
100°C
And connect the wire after brazing.
Waterstage / Maintenance Manual / 2105 - EN