3.10 Oil Sump Heaters
A 500 watt, 120/240 volt silicon rubber flexible
heater is recommended for use on the oil sump
of the 12" (30.5cm) oil separator. Two of the
above 500 watt heaters (connected together) are
recommended for use with the 14" (35.6cm) sep-
arator. The heater must be energized during the
system off cycle if used. This is required in all air
conditioning systems and is recommended in
refrigeration systems to keep refrigerant out of the
oil sump during compressor off cycles.
3.11 Oil Sight Glass
A sight glass is required in the main oil line.
The sight glass must be located after the oil
filters and just prior to the first compressor
on a multiple compressor rack. (See Oil
System Schematics, Section 3.12.) Carlyle
recommends a sight glass be placed in each
branch oil line between the compressor and
its oil solenoids. The sight glass offers a useful
feature to help field personnel verify oil is flow-
ing when required and not leaking through
when the compressor is off.
Carlyle offers a combination oil solenoid/sight
glass that can be used for the application (P/N
EF23ZZ025). It mounts directly to the oil inlet of
the compressor. Refer to Figure 2, Appendix A
for details.
20
15.75”
(400mm)
6.0”
(152mm)
+/-.005
0.050”
(1.27mm)
REF.
0.175”
(4.4mm)
FLEX
HEATER
NATURAL
BLACK
RED
NATURAL
BLACK
RED
240 V
120 V
FLEX HEATER WIRING DIAGRAM
(TO BE LABELED ON PART)
3.9 Oil Filter
Carlyle screw compressors are designed with
rolling element bearings to provide exceptional
life. Oil to the bearings must pass through a
3 micron filter which is required on all Carlyle
screw compressor systems. The use of filters
in parallel as shown in Section 3.12 (Oil System
Schematics) is recommended (one filter per
compressor may also be used). One filter (both
filters may be used simultaneously) is used at a
time and the pressure drop across the filter is
monitored. This design allows easy mainte-
nance of the filter element without shutting the
system down. The second filter is simply
valved on while the first filter is changed.
In general, two oil filter housings are piped in
parallel with isolation valves located on either
side of the housings as shown in the schemat-
ic in section 3.12. If more than 5 compressors
are fed by the oil system, 3 oil filter elements
should be piped in parallel to avoid excessive
pressure drop through the filter elements.
The LonCEM Module is currently used for
compressor protection for 05T/06T compres-
sors. It monitors the difference in pressure in
the oil system from compressor discharge to
the compressor oil inlet with transducers. This
includes the pressure drop across the oil filters.
See appendix A for settings.
In older systems incorporating the Carlyle
Electronic Module (CEM) for compressor pro-
tection pressure transducers or a mechanical
differential switch can be used to monitor the
pressure drop across the oil filters. The setting
for filter alarm or replacement can be at the
customer's discretion with a maximum value of
25 psi (1.7 bar).
Note: Use of the Carlyle 3 micron filter
element is required. Use of a non-Carlyle-
approved filter element will void compres-
sor warranty.
The oil filter(s) must be located after the
oil cooler and as close to the compressor(s) as
possible. The oil filter housing is designed for
450 psig (31 bar) maximum working pressure
and has UL and CSA code approval for use in
HVACR systems. Each new oil filter housing
contains one filter element.
Additional filter
elements should be ordered and supplied
with each compressor system. Six additional
elements per rack are recommended.
FOR REFERENCE ONLY
INCHES
[MILLIMETERS (mm)]