OPERATION
During full load operation, check the compressor oil
level. It should be near the center of the oil sight
glass during operation.
A.
B.
C.
D.
E.
Check the refrigerant charge frequently at the
moisture/liquid indicator. A steady clear glass of
liquid refrigerant indicates sufficient charge. A
green colored button in the center of the moisture
indicator indicates a dry system (should moisture
enter the system, the color will turn yellow). The
button was green before it left the factory and
should be green after a period of operation on
start-up. A filter-drier core change is recommended
for a persistent yellow indicator. (Page 26).
Check the temperature control thecmostat by ob-
serving operation at reduced loads. The thermostat
is factory set for 44F leaving chilled water tem-
perature when the entering temperature is 54F.
Refer to CHECKING CONTROLS section, Pages
20 and 21.
Checkvoltage and amperage of the compressor mo-
tor(s) and fan motors (see Field Wiring, Page 11).
When gauges ace furnished, close gauge ports by
back seating valves after readings ace checked.
This will prolong the gauge life and prevent refrig-
erant loss. Replace seal caps.
See SERVICE INFORMATION section, Pages 28
and 29 for Trouble Shooting Chart.
PERIODIC SERVICE
(At end of first week of operation and once a month
thereafter.)
A.
B.
C.
D.
A. Turn on water circulating pump.
Check
compressor oil level. Oil should cover ap-
proximately l/2 of the oil level glass. Copeland
Compressors ace furnished with oil fill plug on
the side of crankcase, should it be necessary to
add oil. (See Page 25, Paragraph E).
B. Turn pumpdown switches S3 and S4 to "auto” posi-
tion.
Check liquid sight glass ahead of expansion valve
for proper refrigerant charge.
C. Observe operation for several minutes, noting un-
usual sounds, or possible unusual cycling of
compressors.
EXTENDED SHUTDOWN
On belt driven units, check belt tension and ob-
serve condition of belts.
A. Close the liquid line shut-off valve.
Check the surface of the condenser coil for ob- B. Wait for the compressor to pump down until it
struction. If
necessary, flush with cold water,
shuts off.
brush off, or use vacuum cleaner.
E. Make general inspection of entice system for any
unusual sound or condition.
NORMAL REFRIGERANT CHARGE
The condenser coil has a built-in subcooler. For opti-
mum operation. the liquid sight glass in the liquid line
between the receiver and subcooler should be substan-
tially free of bubbles. A completely clear sight glass
indicates a possible overcharged system. No adverse
affect need be expected unless overcharge is suffici-
ent to affect an excessive head pressure caused by
appreciable liquid flooding of condenser portion of
coil. The minimum charge at which the unit will oper-
ate properly is with clear sight glass between the
filterdrier and thermostatic expansion valve.
WEEK END OR SHORT PERIOD SHUTDOWN
A.
B.
Turn pumpdown s w i t c h e s 5% a n d S 4 t o “ m a n ”
position. The compressor or compressors will con-
tinue to run for a short period, until the system
pumps down, and stops on opening of low pccssuce
control.
Turn off water circulating pump (Water circulating
pump is often left on the line as an assist against
damage by freezing of water).
WARNING:
Do not open main electrical discon-
n e c t switch as heater cable and crankcase heater
will be de-energized.
START UP FOLLOWING WEEK END SHUTDOWN
Page
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