All installations and services must be performed by qualified service personnel.
42
pressure-temperature chart on the unit for approximate system line pressures at
various temperatures.
The suction pressure is the most significant pressure reading. If a unit is
suspected of having a low refrigerant charge, the unit should be recharged using
the suction pressure as a guide. The unit is fully charged when proper suction
pressure is obtained. Any additional refrigerant may cause damage or
unintended problems.
The pressure/temperature chart on the wiring diagram is to serve only as a
guide. Pressures shown are realistic averages which will vary somewhat with
changes in air temperatures, air flowrate across the evaporator and condenser
coils and humidity – both inside and outside.
If a charge must be added to the system, connect to the suction service port of
the service valve and add a vapor charge only while the system is operating.
Addition of liquid refrigerant at the suction port may damage the compressor.
2. Definition of Superheat:
Superheat is extra heat added to refrigerant above the vaporization
pressure/temperature of the refrigerant. A small amount of refrigerant superheat
is usually beneficial and needed to help assure the best operation of the cooling
system.
Superheat cannot be measured with a pressure gauge alone. Both pressure and
temperature readings of the suction line are required to evaluate the amount of
refrigerant superheating. The degree of superheating gives an indication of two
important system-operating parameters. Superheat at the suction line outlet of
the evaporator indicates the efficiency of the evaporator coil. Superheated vapor
at the suction line inlet to the compressor insures that liquid refrigerant is not
being pumped into the compressor.
Highly superheated vapor is also detrimental to system operation. The highly
superheated refrigerant may overheat the compressor, resulting in premature
failure and/or intermittent thermal cutout of the compressor. High superheat at
the evaporator also indicates the evaporator is operating very inefficiently by
vaporizing the refrigerant too quickly in the evaporator coil. High superheat at
the evaporator results in some loss of the evaporator heat removal capacity.
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