Hitachi FS3 Series, Service Manual, Page: 124 / 240

2
10
SERVICING
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WARNING: TURN OFF all power source switches
3. Pull out the fixing plate for the thermistor from the pipe after
detaching the CORK TAPE, and remove the thermistor for
the liquid pipe.
2.1.11 REMOVING REVERSING VALVE
Before starting this work, collect refrigerant into a cylinder from
the cycle and turn off all power source switches.
1. Remove the front service panel according to item, 2.1.2.
2. Remove the electrical box cover according to item, 2.1.12.
3. Remove all the field wiring at the terminal board for control
between the indoor and outdoor units, and electrical wiring
terminal board.
4. Disconnect the wiring connections and check to ensure that
two stop valves are open.
5. Disconnect the following to remove the reversing valve.
a. Brazing Portion between Reversing Valve and
Discharge Pipe
b. Brazing Portion of the Right and the Left Pipes of Three
Pipes from the Reversing Valve.
c. Brazing Portion of the Center Pipe of Three Pipes from
the Reversing Valve.
NOTE:
Cover the reversing valve with wet cloth to protect it from
excessively high temperature by a burner.
Thermistor
Thermistor
Holder
Seal
completely
by cork tape
Power Source
Terminal Board
Terminal Board
for Control Circuit
Stop
Valve
Brazing
Brazing
Brazing