AIRTAK C-25 설치, 작동 및 유지보수 지침 - 페이지 8

{카테고리_이름} AIRTAK C-25에 대한 설치, 작동 및 유지보수 지침을 온라인으로 검색하거나 PDF를 다운로드하세요. AIRTAK C-25 12 페이지. Refrigerated water chillers

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.)

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.

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