Control Of The Cooling Cycle; Compressor Control - Hitachi SAMURAI Series Service Manual

Water cooled water chillers -modular-r134a-screw type
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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
36
SMGB0120 rev.0 - 11/2017
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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