FIGURE 7. VANE CONTROL SOLENOID
OPERATION.
CONTINUED
-LEGEND-
- Oil Under Pressure
Oil Sump Pressure
DRAIN FROM
PISTON
TO OIL
-
PUMP
SUMP
SECTION “SB”
ENERGIZED
SECTION “SA”
DE-ENERGIZED
FROM OIL
c
PUMP
DISCHARGE
TO OIL
*PUMP
SUMP
SECTION
“SB”
DE-ENERGIZED
SECTION
“SA”
ENERGIZED
DRAIN FROM
PISTON
FROM OIL
PUMP
DISCHARGE
OIL SYSTEM
The oil system for the PEH/PHH units provides lubrication
and heat removal for the compressor bearings and internal
parts. In addition, the system provides oil under pressure to
hydraulically operate the piston for positioning the inlet guide
vanes for capacity control.
the oil cooler for optimum operation of the oil system.
Bearings are supplied with oil through internally drilled
passages within the compressor assembly. The oil drains
from the bearings into the gear housing and is gravity returned
to the oil sump.
Proper operation of the hydraulic system and bearing
lubrication system can be assured only if McQuay recom-
mended oil is used. For proper oil selection, consult Figure
8. Each unit is factory charged with the proper oil. Under nor-
mal operatioh, no additional oil should be needed.
FIGURE 8. OIL FOR CENTRIFUGAL COMPRESSORS
The oil pump for the CEO50 compressor is completely
self-
contained within the compressor housing. The assembly in-
cludes the pump, pump motor, oil heater and oil separator.
The oil is pumped through the oil discharge line to the oil filter
in the compressor casting and then to the refrigerant-cooled
oil cooler.
The other compressor sizes-CE063, 079, 087, 100 and
126-utilize
a separate oil pump contained in its own oil reser-
voir. This assembly includes pump, motor, heater and oil
separator. Oil is pumped through the discharge line, through
the external oil cooler and then to the oil filter inside the com-
pressor housing. Standard
PEH/PHH 063-126 units utilize
a water-cooled oil cooler although an optional refrigerant-
cooled oil cooler is available.
The oil heaters in the gear case and in the oil pump reser-
voir must remain energized whenever the compressor is off.
IN THE EVENT OF POWER LOSS TO THE HEATERS
ALLOWING THE OIL TO COOL, THE HEATERS SHOULD
BE ENERGIZED FOR 24 HOURS PRIOR TO STARTING
THE COMPRESSOR.
The oil coolers serve to maintain the proper oil temperature
A low oil temperature thermostat (LOT) in the control center
under normal operating conditions. The coolant flow control
prevents the oil pump from starting with cold oil. This ther-
valve should maintain
90” F-l 00” F oil temperature leaving
mostat should be set as high as ambient conditions will allow.
IM 307
/
Page 11
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