RXB PLUS ROTARY SCREW COMPRESSOR UNITSS70-101 IOM
Page 38
4. Close the service valve located between the compressor
and the liquid injection, thermal expansion valve.
5. Carefully loosen the capscrews securing the strainer cover
to the strainer. Allow pressure to relieve slowly.
6. When all entrapped refrigerant has been relieved, care-
fully remove the 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
them clean with air.
8. Reassemble the strainer.
9. Open the service valve between the compressor and the
liquid injection thermal expansion valve and check for leakage.
10. Screw out the manual solenoid valve stem.
11. Carefully open the liquid supply service valve.
12. Leak test.
13. Open suction and discharge valves and readjust suction
check valve bypass (if required). Close the disconnect
switches for the compressor and (if applicable) oil pump
motor starters.
14. Start the unit.
COALESCER FILTER ELEMENT
When changing the coalescer filter element, it is recom-
mended that the oil and oil filter(s) be changed. Applicable
strainer elements should be removed and cleaned.
1. Refer to CHANGING OIL, Steps 1 thru 8.
2. Remove the coalescer head and gasket. Discard the gasket.
3. Remove and retain the nut securing the coalescer filter
retainer.
4. Remove the retainer, coalescer filter element, and 2
O-rings. Discard the filter element.
5. Install the new coalescer filter element.
Seat the element in center of lo-
cating tabs on separator bulkhead.
6. Replace the coalescer filter retainer and nut. DO NOT
OVERTIGHTEN THE NUT. Torque values for nut are: 15 ft-
lb for models 12 and 15; 17 ft-lb for 19 and 24; and 21 ft-lb
for 30–50. Install jam nut.
7. Install a new head gasket and replace the coalescer head.
8. Tighten the head bolts. NOTE: WHEN THE COMPRES-
SOR UNIT IS REPRESSURIZED, RETIGHTEN THE HEAD
BOLTS TO PREVENT THEM FROM LOOSENING.
9. Refer to CHANGING OIL, Steps 9 thru 14.
CHANGING OIL
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.
Use of oils other than Frick Oil in
Frick compressors must be ap-
proved in writing by Frick engineering or warranty claim
may be denied.
Shut down the unit when changing oil. At the same time, all
oil filter cartridges must be changed and all oil strainer ele-
ments removed and cleaned. The procedure is as follows:
1. Push [STOP] key to shut down the unit.
2. Open the disconnect switch for the compressor motor
starter and (if applicable) oil pump motor starter.
3. Close the discharge, and liquid injection (if applicable)
service valves.
4. SLOWLY vent the separator to low-side system pressure
using the suction check valve bypass. Close suction valve
and suction check valve bypass. NOTE: Recover or trans-
fer all refrigerant vapor in accordance with local ordi-
nances before opening to atmosphere. The separator
MUST be equalized to atmospheric pressure.
Oil-entrained refrigerant may va-
porize, causing a separator pres-
sure increase. Repeat venting and
recovery procedure if necessary.
5. Open the drain valve(s) located on the underside of the
separator and drain the oil.
6. Drain the oil filter, strainers, and oil cooler, if applicable.
7. Remove and install new oil filter cartridge(s). Inspect check
valve in the bottom of the filter housing to ensure that the
parts are in good condition.
8. Remove, clean, and reinstall strainer elements in strain-
ers.
9. Evacuate the unit to 29.88" Hg (1000 microns).
10. Open the suction service valve and pressurize the unit
to system suction pressure. Close the suction valve and leak
test.
11. Add oil by attaching suitable pressure-type hose to the
oil-charging valve located on top of the separator. Using a
pressure-type oil pump and recommended Frick oil, open
the charging valve and fill separator until oil level is midway
in the top sight glass. The following table gives approximate
oil charge quantities.
TABLE BASIC OIL CHARGE
RXB MODEL BASIC CHARGE*(Gal.)
12 & 15 10
19 & 24 14
30 & 39 17
50 21
* Add oil volume for external oil cooler, according to cooler
size selected: 6 x 5 TSOC - 4 gal.; 6 x 5 WCOC - 5 gal.; 8 x
5 TSOC - 6-1/2 gal.; and 8 x 5 WCOC - 8 gal.
12. Open the suction, discharge, and liquid injection service
valves. Readjust suction check valve bypass.
13. Close the disconnect switch for the compressor motor
starter and (if applicable) oil pump motor starter.
14. Start the unit.
MAINTENANCE
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