Hitachi SAMURAI Series Service Manual page 52
Air cooled water chillers and air to water heat pump
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Also See for SAMURAI Series:
- Service manual (137 pages) ,
- Service manual (140 pages) ,
- Manual (118 pages)
Table of Contents
2. Control Functions
Control of the cooling cycle
2.2 Control of the cooling cycle
2.2.1 Compressor Control
The compressor mounted on this product is equipped with a system to adjust the amount of discharge (slide valve). The
slide valve is installed on the screw rotor, and performs the adjustment of the amount of discharge with the change of
bypass amount by hydraulic activation.
In the case of load up
To suction side
Suction
gas
In case of load down
To suction side
Suction
gas
44
SMGB0082 rev.1 - 07/2015
Discharge
gas
Slide valve
Rotor
Solenoid valve (202)
Oil supply
Solenoid valve (201)
Oil supply
Bypass
Discharge
gas
Slide valve
Rotor
Solenoid valve (202)
Oil supply
Solenoid valve (201)
Oil supply
Cylinder part
Rod
Piston
Spring
Solenoid valve (203)
Cylinder part
Rod
Piston
Spring
Solenoid valve (203)
The solenoid valves for each operation are shown below:
Solenoid valve
201
Start up
ON
Load up
OFF
Load down
OFF
Intermediate hold
OFF
To suction side
To suction side
202
203
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
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