RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.200-IOM (DEC 11)
Page 27
GENERAL INSTRUCTIONS FOR REPLACING
COMPRESSOR UNIT COMPONENTS.
When replacing or repairing components which are exposed
to refrigerant pressure proceed as follows:
1. Push [STOP] key on control panel to shutdown unit.
2. Open disconnect switches for compressor and pump
motor starters.
3. Close suction and discharge service valves, also 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
ordinances, before opening to atmosphere. The separator
MUST be equalized to atmospheric pressure.
Oil entrained refrigerant may vapor-
ize, causing a separator pressure
increase. Repeat venting and re-
covery procedure, if necessary.
5. Make replacement or repair.
6. Isolate the low pressure transducer, PE‑4, to prevent dam‑
age during pressurization and leak test.
7. Pressurize unit and leak test.
8. Evacuate unit.
9. Open suction and discharge service valves, low pressure
transducer, and also liquid injection and economizer service
valves, if applicable.
10. Close disconnect switches for compressor and oil pump
motor starters.
11. Unit is ready to put into operation.
12.
Perform checkpoints on prestart check list, then start unit.
OIL FILTER (OF-1) MAIN SINGLE/DUAL
RWB II compressor units are furnished with one (1) main oil
filter (OF‑1). A second oil filter (OF‑2) is installed as optional
equipment to facilitate the changing of the filter cartridge(s)
without unit shutdown.
RWB II compressor units with a prelube oil pump are
furnished with one (1) main oil injection filter (OF-1) and
one (1) bearing oil filter (OF-3). Secondary oil filters are
installed as optional equipment to facilitate the changing
of the filter cartridges without unit shutdown.
Use of filter elements other than
Frick may cause warranty claim
may to be denied.
The procedure to change filter cartridge(s) is as follows:
1. If a single oil filter is installed, push [STOP] key on
QUANTUM panel to shutdown unit, then open discon nect
switches for compressor and oil pump motor starters.
If dual oil filters are installed, open the outlet, then inlet ser‑
vice valves of the standby filter.
Open inlet service valve slowly to
prevent a sudden pressure drop
which could cause an oil filter dif-
ferential alarm.
2.
Close outlet then inlet service valves of filter being
serviced.
3. Open bleed valve and purge pressure from the oil filter
cartridge. NOTE: Recover or transfer all refrigerant vapor,
in accordance with local ordinances, before opening to
atmosphere.
4. Remove the plug from the bottom of the filter canister
and drain the oil. Remove the canister cover and discard the
gasket. Remove the screws securing the filter assembly. Pull
the filter assembly from the canister and discard the gasket
and the element.
5. Flush the canister with clean Frick refrigeration oil; wipe
dry with a clean, lint‑free cloth; and replace the plug.
6. Install a new element and tighten the nut on the end plate
to 10 ft‑lb torque. Then, while holding the nut with a wrench,
apply a second nut to act as a locknut. Replace the gasket
and reinstall the filter assembly into canister, securing with
screws tightened to 7 ft‑lb torque. Fill the canister with new
Frick refrigeration oil. Replace the gasket and reinstall the
canister cover. Torque cover bolts first to finger tight, then
65 ft‑lb, then 130 ft‑lb.
DO NOT MIX OILS of different
brands, manufacturers, or types.
Mixing of oils may cause excessive
oil foaming, nuisance oil level cutouts, oil pressure loss,
gas or oil leakage and catastrophic compressor failure.
7. Close purge valve.
8. Open outlet service valve and leak test.
9. Filter is ready to place in service.
STRAINER - DEMAND 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 QUANTUM panel to shut down 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.
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