
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 separator to lowside system
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, PE4, 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 filters.
A third oil filter is installed as optional equipment to facilitate
the changing of the filter element(s) without unit shutdown.
NOTICE
Use of filter elements other than Frick
®
may cause war-
ranty claim to be denied.
The procedure to change filter cartridge(s) is as follows:
1.
If two oil filters 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 filters are installed, open the outlet, then inlet
service valves of the standby filter.
WARNING
Open inlet service valve slowly to prevent a sudden
pressure drop which could cause an oil filter differential
alarm.
2.
Close outlet then inlet service valves of filter being serviced.
3.
Open bleed valve and purge pressure from the oil filter
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 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 compressor oil; wipe dry
with a clean, lintfree cloth; and replace the plug.
6.
Install a new element* and tighten the nut on the end
plate to 10 ftlb 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 ftlb 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 first to finger tight, then 65 ftlb, then 130 ftlb.
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 lintfree clean
cloth.
Содержание Frick 1179
Страница 36: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 36 Figure 37 OIL LEVEL TRANSMITTER ...
Страница 41: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 41 COMPRESSOR PORT LOCATIONS 408 MM ...
Страница 51: ...RWH ROTARY SCREW COMPRESSOR UNITS MAINTENANCE 070 620 IOM DEC 12 Page 51 OPERATING LOG SHEET ...
Страница 62: ...RWH ROTARY SCREW COMPRESSOR UNITS NOTES 070 620 IOM DEC 12 Page 62 ...
Страница 63: ...RWH ROTARY SCREW COMPRESSOR UNITS NOTES 070 620 IOM DEC 12 Page 63 ...