Refrigerant Capacity Controller Operation And Adjustment; Final Process - Trane RRU120 D B Series Installation, Operation And Maintenance Manual

Maintenance
WARNING
No Step Surface!
Failure to follow instruction below could result in death
or serious injury.
Do not walk on the sheet metal base.Walking on the
base could cause the supporting metal to collapse and
result in the operator/technician falling.
Important: Bridging between the main supports
required before attempting to enter the unit.
Bridging may consist of multiple 2 by 12
boards or sheet metal grating.
a. Sprayer nozzle pressure should not exceed 600 psi.
b. The maximum source angle should not exceed 25°
to the face of the coil (see
spray the microchannel perpendicular to face of the
coil.
c. Spray nozzle should be approximately 1–3 in. from
the coil surface.
d. Use at least a 15º fan type of spray nozzle.
Figure 26. Source Angle
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
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.
48
Figure 26). For best results
Source Angle
Figure 27 at the base of the RCC
Figure 27. Refrigerant capacity controller
Refrigerant Capacity
Control - APR valve

Final Process

For future reference, you may find it helpful to record the
unit data requested below in the blanks provided.
1. Complete Unit Model Number:
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2. Unit Serial Number:
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3. Wiring Diagram Numbers (from unit control panel)
- schematic(s)
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- connection(s)
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RCC
RRU-SVX01E-EN