AIRTAK C-25 Інструкції з монтажу, експлуатації та технічного обслуговування - Сторінка 7
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Друкувати сторінку9. Automatic Water Regulating Valve:
This control is found only in chillers equipped with water cooled condensers. The purpose of the valve is
to control the flow of water through the condenser at a rate that is factory set to maintain a constant
condensing pressure.
10. Oil Sightglass:
The oil sightglass is found on the side of the crankcase on accessible semi-hermetic compressors to
provide a visual means of checking the oil level. The oil must be checked only while the compressor is in
operation. During compressor operation the oil sight glass should be approximately 1/2 full.
11. Low Oil Pressure Switch:
This switch is found on semi-hermetic compressors. The oil pressure switch is a pressure differential
switch which senses the pressure difference between the compressor crankcase pressure and the outlet
pressure of the oil pump. The oil pressure must be maintained above the crankcase pressure to insure
proper lubrication (minimum pressure of 9 psi).
If an adequate oil pressure over compressor crankcase pressure is not maintained, the low oil pressure
switch will open and shutdown the refrigerant compressor. This switch is a manual reset switch. Before
resetting, the unit must be thoroughly checked to determine the cause of the failure. A built in time delay
of 120 seconds is provided to permit the refrigeration compressor to start and establish a satisfactory oil
pressure.
12. Refrigerant Liquid Line Filter-Dryer:
A liquid line filter-dryer is used on all AIR/TAK refrigerated chillers. The purpose of the filter-dryer is to
eliminate the possibility of moisture, or other foreign particles, from moving throughout the system.
These particles, such as carbon, can cause early compressor failure. The filter-dryer also has a high
quality desiccant which is capable of removing moisture to a very low point and can also remove a
reasonable quantity of acid.
13. Water Pressure Switch:
This control is used only on chillers equipped with water cooled condensers. The purpose of this
switch is to assure that adequate water pressure is available to the refrigerant condenser.
14. Desuperheating Valve:
This valve is used on larger capacity chillers. Due to the larger refrigerant charges associated with
these models, the addition of the desuperheating valve is necessary. The valve's purpose is to
provide liquid refrigerant to desuperheat hot discharge gas used to establish suction gas pressure.
15. High Temperature Control:
This control is used to protect the compressor from excessive return gas temperature. During the
start-up phase, the high temperature light may be lit until the refrigeration system reaches its normal
running temperatures and pressures. (See Start-up; Section I).
During normal operation on Models C-25 through C-1000 this control will activate the high temperature
light when return gas temperatures become excessive. Immediate action is required by the customer to
turn off the chiller. On models C-1200 and above, this control will activate the high temperature light and
will also open the electrical circuit on the compressor and shutdown the chiller. The chiller will not restart
without the customer turning the selector switch to "OFF" and then back to "ON". Customer evaluation
should be undertaken to determine the cause of the high temperature condition.
After start-up, the high temperature light condition may result from: plugged or dirty condensers, high
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