Daikin EWWD380DJYNN [42/58] Fig 17 capacity control mechanism

Daikin EWWD600DJYNN [42/58] Fig 17 capacity control mechanism
D - KIMWC00211-09EN - 42/58
Spring Force + Oil Pressure > Suction/Discharge Differential Pressure = Slide valve moves toward unload
Suction/Discharge Differential Pressure > Spring Force = Slide valve moves toward load
C
APACITY
C
ONTROL
A
CTION
S
OLENOID VALVE
A
1
S
OLENOID VALVE
B
Load compressor
Oil is vented from the capacity control cylinder. The suction/discharge differential
pressure overcomes the force of the spring and moves the slide valve towards the
maximum load position.
Energised (open)
Deenergised
(closed)
Unload compressor
Highpressure oil is admitted to the capacity control cylinder. The force of the
spring supplemented by oil pressure overcomes the suction/discharge differential
pressure and moves the slide valve towards the minimum load position.
Deenergised
(closed)
Energised (open)
Hold slide valve position
The slide valve is hydraulically locked at the desired load position.
Deenergised
(closed)
Deenergised
(closed)
Fig. 17 Capacity control mechanism
Compressor unloading
De-
Energised
(closed)
Energised
(open)
Oil vent
Oil supply
Permanent vent to suction
Unload
Load
Oil vent
Oil supply
Energised
(open)
De-Energ
ised
(closed)
Permanent vent to suction
Compressor loading

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