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TM-10-4130-239-14 Small Mobile Water Chiller (
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CHAPTER 2 OPERATING  INSTRUCTIONS - TM-10-4130-239-14_24
TM  10-4130-239-14 1-10. GENERAL  OPERATION  (CONT) (3) (4) (5) (6) (7) (8) (9) Fan. The fan draws outside air through the condenser coil to dissipate the heat generated by compressed  refrigerant. Sight Glass. The sight glass is an inline liquid indicator that provides a visual means of determining the condition of refrigerant flowing through the system as follows: A dark green center indictes no moisture in the refrigerant. A light green center indicates an acceptable moisture  content  in  the  refrigerant. A yellow center indicates too much moisture in the refrigerant. Milky white or bubbly liquid indicates a low refrigerant  charge. Clear bubble-free refrigerant indicates a fully charged system. Expansion  Valve. The expansion valve controls expansion of liquid refrigerant to gas. Evaporator. The heat exchanger transfers the heat from the water to the refrigerant. Automatic  Pressure  Control  Switches. The  automatic control switches are provided as high and low pressure  control  devices  for  the  refrigerant  system. a. Low Pressure Switch. The low pressure switch stops the water chiller when the suction line pressure drops to the minimum pressure allowed. b. High Pressure Switch. The high pressure switch stops the water chiller when the allowable maximum working pressure is exceeded. Refrigerant  Service  Ports. The service ports are provided to service the high and low side of the refrigerant system. Pressure Relief Valve. The pressure relief valve vents the refrigerant system to the atmosphere when the maximum allowable pressure is exceeded. 1-9/(1-10 blank)

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