INSTALLATION
erant cooled oil coolers are provided and are com-
pletely piped up in the factory. Refrigerant cooling is
usually limited to the TP050 models.
Water Cooled Oil Coolers
When water is to be the coolant, the oil cooler is
factory mounted with the oil piping installed. Water
piping for the oil coolers must be installed in the field
according to good piping practice and should include:
stop valves to isolate the cooler for servicing, cleanable
strainer (40 mesh maximum), balancing valve to adjust
water flow, solenoid operated water shut-off valve
wired in accordance with Field Connection Control
Diagram, and a drain valve or plug. Water supply for
the oil cooler may be obtained from:
A. Source Water Circuit. See Figure 4.
B. Independent source, such as city water.
C. Cooling tower makeup if the flow is adequate and
continuous and the temperature never exceeds
90°F. See Figure 5.
TABLE 1
Maximum Oil Cooler Water Requirements
And Pressure Drops
M a x i m u m W a t e r
Water Requirement Pressure Drop Thru
M o d e l
85 F Entering Oil Coolers Only
G P M PSI
T E H 0 6 3 8.0 1.8
T E H 0 7 9 8.0 1.8
TEH100
12.25 5.2
T E H 1 2 6 16.0 10.4’
*Pressure drop through two oil coolers with water sides piped in
series - TEH 126 only.
When the oil cooler is piped into the source water
supply, its water piping should be connected across
the source water pump so that the full pressure
differential of the pump is maintained across the cooler
system at all times the pump is running. This is the
recommended arrangement, and most systems will
accommodate it. For those installations where it could
be desirable to pipe the oil cooler system across the
evaporator, this may be done providing the water
pressure drop through the evaporator is greater or
equal to the oil cooler pressure drop.
Under no circumstances should the oil cooler be piped
in parallel with a single pass evaporator. This will result
in inadequate cooling water to the oil cooler due to the
low evaporator pressure drop.
When supplied with city water, the oil cooler water
piping should discharge into an open drain to prevent
draining the cooler by siphoning. This water may also
be used for cooling tower makeup by discharging it
into the tower sump from a point above the highest
possible water level.
On R12 units, the water flow through the oil cooler
must be adjusted with the balancing valve so that the
temperature of oil supplied to the compressor bearings
(entering the compressor) is not less than 90°F nor
more than 120°F. On systems using source water for a
cooling medium, the leaving oil temperature should be
on the low side of the acceptable temperature range
when operating with the coldest water.
For R114 units oil temperatures are normally higher.
For settings consult special instructions furnished with
the unit.
FIGURE 5
OIL COOLER PIPING
On some units, oil cooler water solenoid valves are
factory furnished. On those units where the solenoid
valve is required and not furnished, the installing
contractor must supply the solenoid.
Refrigerant Cooled Oil Coolers
On those Templifier units furnished with refrigerant oil
cooling, the shut-off and flow control are built into the
refrigerant piping.
Subcooled liquid from the condenser is fed to the oil
cooler through an oil temperature control valve whose
control bulb is located on the oil line leaving the oil
cooler. The gas - liquid mixture returns to the inlet of
the evaporator. Refrigerant flow is controlled to main-
tain an oil temperature of approximately
in
R12 Templifiers. Oil Coolers in R114 Templiers operate
at higher temperatures.
6
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