Hitachi FS3 Series, Service Manual, Page: 122 / 240

2
8
SERVICING
$
WARNING: TURN OFF all power source switches
A-1. Removing High Pressure Switch
(RAS-5FSG, RAS-8FSG, RAS-10FSG,
RAS-5FS3, RAS-8FS3 and RAS-10FS3)
®
Disconnect the faston terminals
¯
Remove the high pressure switch from the brazing part of
the discharge pipe by a burner
Note:
Do not expose the refrigeration cycle to the atmosphere for
a long period to avoid mixing of water and foreign particles
into the refrigeration cycle. If exposed for a long period,
seal the hole.
A-2. Removing High Pressure Switch
(RAS-16FSG, RAS-20FSG, RAS-16FS3 and RAS-20FS3)
®
Disconnect the high pressure switch from the union
Note:
Do not expose the refrigeration cycle to the atmosphere for
a long period to avoid mixing of water and foreign particles
into the refrigeration cycle. If exposed for a long period,
seal the hole.
B. Removing High Pressure Sensor and Low Pressure
Sensor
®
Remove the water-proof caps
Note:
The water-proof caps are used after replacing pressure
sensors.
¯
Remove the pipe of the high pressure sensor or low
pressure sensor using two spanners. Firstly remove the
check joint at the manin pipe side.
°
Remove the connector for the pressure sensors.
±
Remove the high pressure sensor or low pressure sensor
after removing each two (2) fixing screws for the pressure
sensors.
Note:
Put the water-proof caps on the pressure sensors again
after replacing pressure sensors.
Firstly remove the main pipe at the check joint.
If the sensor side is removed refrigerant will be discharged.
Faston
Terminal
High Pressure Switch
Brazing Part
High Pressure Switch
Union
Low Pressure
Sensor
Two Spanners
Mounting Plate for
Pressure Sensors
Screw
Screw
Electrical Box
Water-proof
Cap
High Pressure sensor
In Case of
20HP
In Case of
8 and
10HP
RAS-5FSG, 5FS3,
RAS-8FSG, 8FS3,
RAS-10FSG, 10FS3 RAS-16FSG, 16FS3
RAS-20FSG, 20FS3