RXB PLUS ROTARY SCREW COMPRESSOR UNITS S70-101 IOM
Page 37
1. If a single oil filter is installed, push [STOP] key to shut-
down the unit. Open disconnect switches for the compres-
sor and (if applicable) oil pump motor starters.
2. Close discharge service valve. SLOWLY vent the separa-
tor to low-side system pressure using the suction check valve
bypass. Close suction valve and suction check valve by-
pass. NOTE: Recover or transfer all refrigerant vapor, in
accordance with local ordinances, before opening to at-
mosphere. The oil filter cartridge MUST be equalized to
atmospheric pressure before opening.
Oil-entrained refrigerant may va-
porize, causing a pressure in-
crease. Repeat venting and recov-
ery procedure, if necessary.
3. 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.
4. Flush the canister with clean Frick refrigeration oil; wipe
dry with a clean, lint-free cloth; and replace the plug.
5. 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 lock nut. 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.
6. Isolate the low pressure transducer, PE-4, to prevent dam-
age during pressurization and leak test.
7. Pressurize and leak test. Evacuate the unit to 29.88" hg
(1000 microns).
8. Open suction and discharge the service valves, and the
low pressure transducer. Readjust suction check valve by-
pass. Close disconnect switches for the compressor and (if
applicable) the oil pump motor starters. Start the unit.
OIL FILTER(s) - DUAL
RXB compressor units are furnished with one main oil filter.
A second filter is installed as optional
equipment to minimize down time and
reduce refrigerant loss.
1. If dual oil filters are furnished, open the inlet and then the
outlet service valves of the standby filter.
Open outlet and inlet service valves SLOWLY to prevent
a sudden pressure drop which could cause an oil filter
differential cutout.
2. Close the outlet and then the inlet service valves of the
filter being serviced. Open the bleed valve on the filter can-
ister and SLOWLY purge to atmospheric pressure.
3. Follow instructions 3, 4, and 5 under “OIL FILTER -
SINGLE”
4. Place the unit back into service.
OIL RETURN STRAINER
The unit must be shut down and equalized to atmospheric
pressure. NOTE: Recover or transfer all refrigerant va-
por in accordance with local ordinances before open-
ing to atmosphere.
1. Remove the large plug from the bottom of the strainer,
remove the element from the strainer.
2. Wash the element in solvent and blow it clean with air.
3. Replace the element and the large plug.
4. Open the valves closed in Step 1 and check for leakage.
OIL PUMP STRAINER (Optional)
To clean the full-lube oil pump strainer, the unit must be
shut down. The procedure is as follows:
1. Shut down the unit and open the disconnect switches for
the compressor and (if applicable) the oil pump motor start-
ers. Isolate and equalize unit to atmospheric pressure (See
General Instructions for Replacing Compressor Unit Com-
ponents).
2. Close the inlet service valve.
3. Open the drain valve located in the strainer cover and
drain the oil into a container.
4. Remove the capscrews securing the strainer cover,
strainer cover gasket, and element. Retain the gasket.
5. Wash the element in solvent and blow it clean with air.
6. Wipe the strainer body cavity clean with a lint-free clean
cloth.
7. Replace the cleaned element and gasket, then reattach
the cover using the retained capscrews.
8. Close the drain valve and open the strainer inlet service
valve.
9. Check for leakage.
10. Open suction and discharge valves and readjust suc-
tion check valve bypass (if required). Close the disconnect
switches for the compressor and (if applicable) the oil pump
motor starters.
11. Start the unit.
LIQUID INJECTION STRAINER
To clean the liquid injection strainer, the unit must be shut
down. The procedure is as follows:
1. Shut down unit and open the disconnect switches for the
compressor and (if applicable) oil pump motor starters. Iso-
late and equalize unit to atmospheric pressure (See Gen-
eral Instructions for Replacing Compressor Unit Compo-
nents).
2. Close the liquid supply service valve located before the
liquid solenoid.
3. Immediately screw in the manual solenoid valve stem
to relieve liquid refrigerant pressure trapped between
the solenoid and the service valve.
MAINTENANCE
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