RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-210 IOM
Page 25
STRAINER - FULL LUBE OIL PUMP
To clean the full-lube oil pump strainer, the unit must be shut
down. The procedure is as follows:
1. Push STOP key on microprocessor panel to shutdown
unit, then open disconnect switches for compressor and oil
pump motor starters.
2. Close strainer inlet service valve.
3. Open drain valve located in the strainer cover and drain
oil into a container.
4. Remove capscrews securing strainer cover, strainer cover,
gasket and element. Retain gasket.
5. Wash element in solvent and blow clean with air.
6. Wipe strainer body cavity clean with a lint free clean
cloth.
7. Replace cleaned element, gasket and reattach cover using
retained capscrews.
8. Close drain valve and open strainer inlet service valve.
9. Check for leakage.
10. Close disconnect switches for compressor and oil pump
motor starters.
11. Start unit.
STRAINER - LIQUID INJECTION
To clean the liquid injection strainer the unit must be shut
down. The procedure is as follows:
1. Push [STOP] key on microprocessor panel to shutdown
unit, then open disconnect switches for compressor and oil
pump motor starters.
2. Close liquid supply service valve located before liquid
solenoid.
3. IMMEDIATELY SCREW IN THE MANUAL SOLENOID
VALVE STEM TO RELIEVE LIQUID REFRIGERANT PRES-
SURE TRAPPED BETWEEN THE SOLENOID AND THE
SERVICE VALVE.
4. Close service valve located between the compressor and
the liquid injection thermovalve.
5. Carefully loosen capscrews securing the strainer cover to
the strainer. Allow pressure to relieve slowly.
6. When all entrapped refrigerant has been relieved, care-
fully remove loosened capscrews (as liquid refrigerant is
sometimes caught in the strainer), strainer cover and strainer
basket.
7. Wash the strainer basket and cover in solvent and blow
clean with air.
8. Reassemble strainer.
9. Open service valve between compressor and liquid injec-
tion thermovalve and check for leakage.
10. Screw out manual solenoid valve stem.
11. Carefully open liquid supply service valve.
12. Leak test.
13. Close disconnect switches for compressor and oil pump
motor starters.
14. Start unit.
COALESCER FILTER ELEMENT(S)
Use of filter elements other than
Frick may cause warranty claim
may to be denied.
When changing the coalescer filter element(s) it is recom-
mended that the oil be changed, cartridge(s) in oil filters
OF-1, OF-2, and OF-3 if applicable be changed and the
following applicable strainer elements be removed and
cleaned.
1. Refer to oil changing Steps 1 through 8.
2. Loosen manway cover retainer bolts, remove retainers,
manway cover and cover gasket. Discard cover gasket.
3. Remove and retain nut securing coalescer filter retainer.
4. Remove retainer, coalescer filter element and 2 O-rings.
Discard filter elements.
5. Install new coalescer filter element(s).
Seat element in center of locating
tabs on separator bulkhead.
6. Replace coalescer filter retainer and nut. Torque nut to 21
ft-lb. DO NOT OVERTIGHTEN NUT.
7. Install a new manway gasket and replace manway
cover.
8. Tighten manway bolts. NOTE: RETIGHTEN AFTER THE
COMPRESSOR UNIT IS REPRESSURIZED, SINCE MAN-
WAY BOLTS WILL LOOSEN.
9. Refer to oil changing Steps 9 through 14.
CHANGING OIL
DO NOT MIX OILS of different
brands, manufacturers, or types.
Mixing of oils may cause exces-
sive oil foaming, nuisance oil level
cutouts, oil pressure loss, gas or oil leakage and cata-
strophic compressor failure.
Use of filter elements other than
Frick may cause warranty claim
may to be denied.
Shut down the unit when changing oil. At the same time all oil
filter cartridges must be changed and all oil strainer elements
removed and cleaned. The procedure is as follows:
1. Press the [STOP] key on the microprocessor panel to stop
the compressor unit.
2. Open the disconnect switch for the compressor motor
starter.
3. Close the suction and discharge service valves; also
close the liquid-injection and economizer service valves, if
applicable.
4. SLOWLY vent separator to low-side system pressure us-
ing the bypass line on the suction trap. NOTE: Recover or
transfer all refrigerant vapor, in accordance with local
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