RXB PLUS ROTARY SCREW COMPRESSOR UNITSS70-101 IOM
Page 34
OPERATION
PRESTART CHECKLIST
All check points in the following list must be completed before placing the compressor unit in operation. Only when the checklist
is completed will the unit be ready for initial start-up.
CHECKPOINT
Ammonia Units: Only refrigerant grade Ammonia as specified by International Institute of Ammonia Refrigeration
(IIAR) Bulletin # 110, Section 3.3 should be used with FRICK equipment.
Unit pressure test. Close suction and discharge service valves, and isolation valve to low pressure transducer.
Introduce pressure to unit and check for leaks. CAUTION: Do NOT exceed 80% of relief valve and/or 100% of
the vessel’s design working pressure.
Charge unit with proper amount and grade of oil. Oil level should be between the two
sight glasses on the oil separator.
Evacuate unit and system to 29.88" Hg. vacuum (1000 microns) to ensure that the system
is free of moisture and noncondensable gases. Additional information regarding
evacuation is detailed in the following publications:
AMMONIA - International Institute Of Ammonia Refrigeration (IIAR) Bulletin # 110, Section 5.4.
HALOCARBONS - Refrigeration Service Engineering Society (RSES) Service Application Manual,
Section 83, Forms 610-57 and 630-46.
Confirm that all field wiring is complete.
With coupling center removed, check for proper compressor motor rotation. COMPRESSOR
ROTATION IS CLOCKWISE WHEN FACING COMPRESSOR SHAFT. Check for proper alignment. OPEN
compressor motor disconnect. Replace coupling center.
If applicable, check Full-Time Oil Pump for correct rotation. OPEN oil pump motor disconnect.
Confirm that motor overload and CT is properly sized.
With ALL motor disconnects OPEN, turn control power ON and check ALL voltages.
Check that oil heater circuit is on. CAUTION: The oil heater should be on 24 hours
before initial start-up is attempted.
Confirm that the Emergency Stop Button is not depressed. Disengage by gently twisting to the left.
Confirm Microprocessor function. Rotate through displays.
Rotate to the ADJUSTABLE setpoints display (2 pages) and enter setpoints including DAY, DATE, and TIME.
Return to the Operating display, then rotate back to the ADJUSTABLE setpoints display to confirm that the
proper setpoints have registered. Press [F1] to return to the Operating display.
Rotate to the ANNUNCIATOR display. Confirm that all setpoints are normal and that no
alarm or cutout indications are present. Press [F1] to return to the Operating display.
Open all oil circuit service valves to allow normal oil flow.
If applicable, start the oil pump by turning the oil pump switch to HAND. Confirm oil
pressure buildup pump rotation. Separator oil level may drop as oil filter(s) and oil
cooler fills up. Add oil as required. Allow oil pump to operate 10 minutes to flush the
lubricating circuit. Shut down oil pump. Place the oil pump switch in the AUTO mode.
Open discharge and suction service valves.
Open the oil return needle valve located at the bottom of the coalescer section of the oil separator.
Open all hydraulic control valves for the slide valve (compressor loading and unloading)
and the slide stop (volumizer).
Open all required oil cooling valves. LIQUID INJECTION: service valves should be fully
open with the exception of the bleed valve which should be opened 1/4 turn. WATER-COOLED
OIL COOLER: confirm adequate water supply is present and adjust water-regulating valve to midrange.
Close economizer service valves, if applicable. The economizer can be put into service
once normal operation is established.
Confirm that the entire refrigeration system is ready for compressor operation and that
sufficient load is available for compressor start-up.
Close compressor motor main disconnect.
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