GENERAL OPERATION (CONT)
The fan draws outside air through the
condenser coil to dissipate the heat generated by
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
A light green center indicates an acceptable
moisture content in the refrigerant.
A yellow center indicates too much moisture in the
Milky white or bubbly liquid indicates a low
Clear bubble-free refrigerant indicates a fully
The expansion valve controls
expansion of liquid refrigerant to gas.
The heat exchanger transfers the heat
from the water to the refrigerant.
Automatic Pressure Control Switches.
control switches are provided as high and low
pressure control devices for the refrigerant system.
Low Pressure Switch.
The low pressure switch
stops the water chiller when the suction line
pressure drops to the minimum pressure allowed.
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
Pressure Relief Valve.
The pressure relief valve
vents the refrigerant system to the atmosphere when
the maximum allowable pressure is exceeded.