070.610-IOM (JUL 21)
Page 8
RWF II Rotary Screw Compressor Units
Installation
WARNING
Holding-charge shipping gauges on separator and
external oil cooler are rated for 30 PSIG and are for
checking the shipping charge only. They must be re-
moved before pressure testing the system and before
charging the system with refrigerant. Failure to re-
move these gauges may result in catastrophic failure
of the gauge and uncontrolled release of refrigerant
resulting in serious injury or death.
All units must be kept in a clean, dry location to prevent
corrosion damage. Reasonable consideration must be
given to proper care for the solid-state components of the
microprocessor. Contact Frick service for long term stor-
age requirements.
Piping connections
See the Foundation section for additional information.
WARNING
Use caution and appropriate safety methods when
welding to a package that contains oil.
NOTICE
Check and remove temporary end plates, sealing
discs, threaded plugs, and blind anges on customer
connections before connecting piping.
Compressor unit 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.
NOTICE
The Frick oil charge shipped with the unit is the best
suited lubricant for the conditions specied at the
time of purchase. If there is any doubt due to the re-
frigerant, operating pressures, or temperatures, refer
to Frick Oil publication 160.802-SPC.
Oil charge
NOTICE
Oil may migrate from the wet sump area to the dry
coalescer area during transportation and handling.
Prior to commissioning the compressor, check for any
oil migration. Oil transfer may be needed.
Table 5: Model charge
RWF II models Basic charge* (gal)
100, 119 SS, 134, 159 SS 45 or 50†
177, 209 SS, 222, 264 SS 90
270, 316, 375 SS, 399, 472 SS 120
480, 546 130
496 190
676, 856, 1080 220
*Includes total in horizontal oil separator and piping. Add 5 gal. for oil cooler
up to Model 270, 10 gal. for 316 - 1080.
†
For overall vessel length of 128
5
⁄
16
= 45 gal
For overall vessel length of 136
5
⁄
16
= 50 gal
The normal charging level is midway in the top sight
glass located midway along the oil separator shell. Nor-
mal operating level is midway between the top sight glass
and bottom sight glass. The table gives the approximate
oil charge quantity.
Add oil by attaching the end of a suitable pressure type
hose to the oil drain valve located under the oil separator.
See Figure 7. Using a pressure-type pump and the recom-
mended Frick oil, open the drain valve and pump oil into
the separator.
NOTICE
Evacuation of the oil separator will assist the ow of
oil into the unit. Also, ll slowly because oil will ll
up in the separator faster than it shows in the sight
glass.
Figure 7: Oil drain valve
Oil distillers and similar equipment which act to trap oil
must be lled prior to unit operation to normal design
outlet levels. The same pump used to charge the unit can
be used for lling these auxiliary oil reservoirs.
NOTICE
The sight glass located in the coalescing end of the
separator near the discharge connection should remain
empty.
Oil heaters
Standard units are equipped with one to three 1000 W
oil heaters, providing sufcient heat to maintain the oil
temperature for most indoor applications during shutdown
cycles to permit safe start-up. Should additional heating
capacity be required because of low ambient temperature,
contact Johnson Controls-Frick. The heaters are energized
only when the unit is not in operation.
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