AIRTAK C-25 through C-8000 Installation, Operation And Maintenance Instructions - Page 8

Browse online or download pdf Installation, Operation And Maintenance Instructions for Chiller AIRTAK C-25 through C-8000. AIRTAK C-25 through C-8000 12 pages. Refrigerated water chillers

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ambients, high inlet fluid temperatures or high fluid flow rates.

16. Start Timer:

Standard on C-1200 and larger chillers. This timing device is used in conjunction with the High
Temperature Control in item 16. During start-up, this device will temporarily energize the compressors
electrical circuit. The start timer is factory set to allow adequate time for the refrigeration system to reach
normal suction gas temperatures. If normal suction gas temperatures do not occur within the factory set
time, the compressor will shut down. (See item 16 above.)

17. Pump Down System:

Standard on all chillers above C-150, liquid line and hot gas line solenoid valves are wired to open
when the power on switch is turned on, and to close when the switch is off. When in the off position, the
chiller will pump most of the refrigerant charge into the receiver until the low pressure switch de-
energizes the compressor.

18. Freeze Control:

Standard on all chillers. When the water temperature leaving the evaporator nears freezing, this
switch de-energizes the compressor while allowing the water pump ( if provided ) to continue to run.
After the installation of your chiller at a suitable location, the following checks should be made:
a) The R-22 refrigerant analyzer gauge should be indicating the chiller shut down pressure of 125-
175 PSIG (70-110 PSIG for 134A). If analyzer pressure is above or below normal shut down
pressure, do not start the chiller. Pressures may vary with ambient temperature.
b) The operational switch must be in the "OFF" position.
c) The main electrical disconnect is energized.
d) The amber power on light is "ON".
e) (Water cooled units only). Open water supply valve.
Units that DO NOT require a crankcase heater (Models C-25 through C-75 can be started immediately
after step E (above) by turning the on off switch on. The red High Temperature Light may remain on for a
short time after the unit is started and the R-22 Refrigerant Analyzer Pressure will drop to its normal
range to indicate 58-76 PSIG (28 –35 PSIG for 134A). When the red High Temperature Light goes out,
the chiller is ready to assume full load operation.
MODELS C-100 AND LARGER ARE EQUIPPED WITH CRANKCASE HEATERS AS STANDARD. THE
CRANKCASE HEATERS MUST BE ENERGIZED TWENTY-FOUR HOURS BEFORE INITIAL START-
UP OR AFTER ANY PROLONGED SHUT DOWN. After the 24hour period, the chiller may be started.
The Refrigerant Analyzer pressure will drop and bring itself to the normal running pressure, 58-76 PSIG
(28 –35 PSIG for 134A). When the red High Temperature light goes out, the chiller is ready to assume
full load operation.
Chillers having dual condenser fans will have one (1) fan which may start when the operational switch is
turned on. The cycling of the fan(s) is controlled by the low ambient control which is factory preset to
maintain the proper head pressure within the refrigerant system.
I. START-UP
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