Dunham-Bush ACXi 165-5SP-LN, Инструкция по установке, эксплуатации и обслуживанию

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NORMALLY
OPEN
UNLOADING
SOLENOID
SUCTION
SOLENOID
LOADING
NORMALLY
CLOSED
SCHRADER VALVE
CHECK
SERVICE
SUCTION
VALVE
'B'
'A'
VALVE
BOX
TERMINAL
3.0 OPERATION
When the compressor is given a "hold"
command, valve A is de-energized (closed) and
slide valve movement is halted. The internal
pressure regulating valve allows oil to bleed from
the slide valve chamber during the hold
condition. If valve B is then de-energized (open),
the high pressure oil acting on the slide valve will be vented to suction, and the pressure in the
slide valve chamber will be reduced. The slide
valve spring will now move the slide valve back
toward the minimum capacity position.
Under standard conditions, the compressor will
load in 60 seconds and unload in 55 seconds.
SLIDE VALVE POSITION
UNLOADING LOADING HOLD
SOLENOID VALVE A
(NORMALLY CLOSED)
CLOSED
(DE-ENERGIZED)
OPEN
(ENERGIZED)
CLOSED
(DE-ENERGIZED)
SOLENOID VALVE B
(NORMALLY OPENED)
OPEN
(DE-ENERGIZED)
CLOSED
(ENERGIZED)
CLOSED
(ENERGIZED)
FIGURE 3.13 COMPRESSOR CAPACITY CONTROL DETAIL
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