K90-KPCS-IM-2 18/04/22
- 8 -
SYSTEM ACCESSORIES
Some of the important components of a parallel compressor
system are as follows:
1. The Coalescent Type Oil Separator has an extremely ne and
efcient lter. This lters particles down to 0.3 microns in size,
which can easily pass through other lters and dryers in the sys-
tem. Because of this nature, the initial lter has a tendency to get
clogged quickly.
After an initial run of 24 to 48 hrs, the lter should be replaced
with a new one.
2. An Inlet Pressure Regulator and Outlet Pressure Regulator are
used for head pressure control under low ambient temperature
conditions.
3. (Optional) Oil Level Control is used to regulate oil ow back to
the compressor crankcase and maintain a minimum oil level. The
oil level control is adjustable between ½ sight glass and ¼ sight
glass. Do not adjust beyond 10 turns down from the top stop or the
control may be damaged.
In addition, the Oil Pressure Differential Valve is installed on the
oil feed line. The valve maintains the pressure of the oil to the
compressor crankcase at 10-25 psi higher than crankcase pres-
sure. Without the valve, the oil level control would overfeed the
compressor. The valve setting is adjusted at the factory (20 psi).
4. (Optional) OMB Electronic Oil Level Control is used to regu-
late oil ow back to the compressor crankcase and maintain a
minimum oil level. Offers alarm and status lights as well as safety
lockout features.
5. (Optional) Each compressor may have a Phase/Voltage Monitor
for protection against phase loss (single phasing), phase reversal
(improper sequence), high voltage and low voltage (brownouts).
6. (Optional) A microprocessor Refrigeration Controller controls
the refrigeration system including compressors and system
evaporators. Separate output relay boards are mounted on each
condenser (or at compressors) to control fan cycling and split
circuiting. Refrigeration controller may require eld program-
ming to perform major functions as per available data. All the set
points should be reviewed by customer and need to be reset as
per actual requirements. An optional modem could be provided.
7. (Optional) A Refrigerant Leak Detector (sniffer type) is recom-
mended. It may be mounted (or shipped separately) on the unit.
This leak detector can detect leaks in the machine room area
close to its sensor location. An IRLD (Infra Red Leak Detection
System) is recommended for higher sensitivity of leak detection.
When conventional leak detection methods are employed using HCFC or CFC tracer gas, all of the tracer gas must be reclaimed and
disposed of in a proper manner.
IMPORTANT ENVIRONMENTAL NOTE
A proper refrigerant leak detector must be employed and monitored at all times in the machine room where the parallel compressor
system is installed. An effective monitoring and quick response is necessary to avoid any prolonged leakage of refrigerant.
Manufacturer will not be responsible for any refrigerant loss and its environmental impact from the system.
IMPORTANT ENVIRONMENTAL NOTE / WARNING
LEAK TESTING
IMPORTANT: All system piping, including the parallel compressor
unit and accessories should be thoroughly tested for leaks
prior to start up and charging. The system should be initially
pressurized to a maximum of 150 psig (1136 kPa) with dry
nitrogen to ensure that the system is free of major leaks. With the
system free of major leaks, a more detailed leak check should be
performed. It is recommended that an electronic leak detector be
used when checking for leaks because of its greater sensitivity
to small leaks. As a further check it is recommended that this
pressure be held for a minimum of 12 hours and then rechecked.
Follow the recommendations of the leak detector manufacturer
for the procedure. The system must be leak free for satisfactory
operation.
