Johnson Controls Frick 852 User Manual

RWH ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.620-IOM (DEC 12)
Page 24
1. Push [STOP] key on control panel to shut down 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 sepa rator t o lowsi de s yste m
pressure using the bypass line on the suction trap.
NOTICE
Recover or transfer all refrigerant vapor, in accordance
with local ordinances, before opening to atmosphere.
The separator MUST be equalized to atmospheric
pressure.
WARNING
Oil-entrained refrigerant may vaporize, causing a sepa-
rator pressure increase. Repeat venting and recovery
procedure, if necessary.
5. Make replacement or repair.
NOTICE
Replace all gaskets and O-rings with new ones. Suction
Strainer: remove, inspect and clean as necessary and
replace using a new gasket.
6. Isolate the low pressure transducer, PE4, to prevent
damage 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 checklist, then start unit.
OIL FILTER
RWH compressor units are furnished with two main oil lters.
A third oil lter is installed as optional equipment to facilitate
the changing of the lter element(s) without unit shutdown.
NOTICE
Use of lter elements other than Frick
®
may cause war-
ranty claim to be denied.
The procedure to change lter cartridge(s) is as follows:
1. If two oil lters are installed, push [STOP] key on micro
processor panel to shut down unit, then open discon nect
switches for compressor and oil pump motor starters.
If three oil lters are installed, open the outlet, then inlet
service valves of the standby lter.
WARNING
Open inlet service valve slowly to prevent a sudden
pressure drop which could cause an oil lter differential
alarm.
2. Close outlet then inlet service valves of lter being serviced.
3. Open bleed valve and purge pressure from the oil lter
cartridge.
NOTICE
Recover or transfer all refrigerant vapor, in accordance
with local ordinances, before opening to atmosphere.
4. Remove the plug from the bottom of the lter canister
and drain the oil. Remove the canister cover and discard the
gasket. Remove the screws securing the lter assembly. Pull
the lter assembly from the canister and discard the gasket
and the element.
5. Flush the canister with clean compressor 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 lter assembly into canister, securing
with screws tightened to 7 ftlb torque. Fill the canister with
new Frick refrigeration oil.
WARNING
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.
Replace the gasket and reinstall the canister cover. Torque
cover bolts rst to nger tight, then 65 ftlb, then 130 ftlb.
7. Close purge valve.
8. Open outlet service valve and leak test.
9. Filter is ready to place in service.
STRAINER - OIL PUMP
To clean the 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.

Johnson Controls Frick 852 Specifications

General

Brand	Johnson Controls
Model	Frick 852
Category	Compressor
Language	English