Precautions For Exchange Of Refrigerant-Cycle-Parts - Fujitsu Waterstage WS G140DC6 Series Maintenance Document

Split system (Single phase and 3-phase type)
Procedure for compressor installation
Reverse procedure to removing the compressor.
Precautions for installation of compressor.
1 When brazing, do not apply the flame on the terminal.
2 When brazing, be sure to replace the air in the pipe with nitrogen gas to prevent forming oxidization
scale.
6.3

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 whan its
detaching is difficult.
(3) Cool the parts when there are parts where heat might be transmilled 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 no 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
EXPANSION VALVE (MAIN)
EXPANSION VALVE
(INJECTION)
4 WAY VALVE
3 WAY VALVE (GAS)
3 WAY VALVE (LIQUID)
UNION JOINT
PRESSURE SENSOR
SOLENOID VALVE
112
Allowable
temperature
Remove the coil before brazing.
120°C And install the coil after brazing.
Detaching necessity sensor.
Remove the coil before brazing.
120°C
And install the coil after brazing
Remove the suction temp. sensor before brazing.
120°C
And install the suction temp. sensor after brazing.
100°C
Remove the pressure sensor before brazing.
100°C
And install the pressure sensor after brazing.
Tighten the flare part gripping it. (Tightening torque : 12+-1.5N.m)
100°C
Do the static electricity measures.
Remove the coil before brazing.
200°C
And install the coil after brazing.
Fujitsu General (Euro) GmbH
Werftstrasse 20
40549 Düsseldorf - Germany
Precautions in work
Maintenance Document 1544-1