System Operation - Turbo Air ADR042 Installation & Operation Manual

System Operation.

Evaporator Superheat.
Evaporator superheat is generated from
the compressor suction line reducing
system efficiency.
Normally 6℉ to 12℉ is acceptable on
most refrigeration systems. Preferably,
6℉ to 8℉ on low temperature systems
and 8℉ to 10℉ on medium temperature
systems are desired.
operating at higher temperatures, the
superheat can be adjusted to 12℉ to 15℉
as required.
The method of measuring evaporator
superheat is found by P-T method.
Obtain evaporator
measuring the suction line temperature at
Compressor Superheat.
Compressor superheat has an effect on
system capacity
Compressor superheat
compressor life
minimum of 20℉
compressor. Too
superheat can permit liquid return to the
compressor causing damage.
Too high a compressor superheat can
cause high discharge
resulting in lubricant
compressor overheating and can lead to
compressor damage or failure.
For systems
superheat
and efficiency.
affects
and recommends
superheat at the
low a compressor
temperature,
breakdown,
the expansion valve bulb. Obtain pressure
at a Schrader fitting in the evaporator
suction connection
expansion valve bulb, and convert to
temperature with a P-T chart.
Subtract the converted temperature from
the measured
difference
evaporator.
superheat by adjusting the expansion
valve.
Evaporator superheat greater than 14℉
can substantially reduce system capacity,
by while superheat less than 4℉ has the
potential for flood back.
Compressor superheat can be changed by
adjusting the expansion valve, adding a
suction-liquid line heat exchanger.
a Obtain compressor
measuring the suction line temperature
about 6 to 12 inches from the compressor
service valve.
Obtain pressure at the suction service
valve and convert to temperature with a
P-T chart.
temperature
temperature
superheat at the compressor.
16
area, near
temperature and
is superheat at
Obtain the
superheat
Subtract the converted
from the measured
and the difference
the
the
the
desired
by
is