38 RRU-SVX02F-EN
Refrigerant Capacity Controller Operation and
Adjustment
The Refrigerant Capacity Control (RCC) is factory set at
114 psig and should not require adjustment. To check or
adjust the RCC, attach refrigeration gauges to Circuit 1.
As the damper closes, the suction pressure will fall. When
the suction pressure reaches approximately 114 psig the
refrigeration gauge will fluctuate rapidly, indicating the
RCC opening point. The gauge will stabilize quickly. If this
rapid fluctuation occurs at approximately 114 psig the RCC
is properly set. To adjust the RCC pressure setting,
unscrew the cap shown in Figure 17 at the base of the RCC
hot gas pressure regulator to access the adjustment screw.
A 5/16-in. standard or hex wrench is used to adjust the
pressure setting. Turning the wrench counter-clockwise
(out) increases the pressure setting. The RCC will continue
by passing enough hot-gas discharged from the
compressor to keep the system capacity in balance with
the system load; and the system energy draw consistent
with the system capacity.
Figure 17. Refrigerant capacity controller
Refrigerant Capacity
Control - APR valve
RCC
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