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EXPANSION VALVE
The expansion valve/ liquid line/drier connects to one of the plate fittings and at the
discharge fitting on the compressor section.
After assembly externally mounted, valves will need to be insulated to prevent frost and
sweating.
Installers Set up
The constant pressure valve sets the refrigerant boiling point. The pressure setting will
indicate the minimum temperature that the freezer system can obtain. It has been pre
set at the factory. Observing the low side pressure with gauges, note that the pressure
is constant at 2 to 8 psi. , depending on the valve setting. If adjustment is needed, set
the valve pressure at the lowest possible pressure setting that will cool the box. The
plate temperature will always be at least 5 to 10 degrees colder than the box. Problems
will occur when the pressure is high and the thermostat is set low; the thermostat will
never be satisfied. The compressor will never stop. Refer to a pressure temperature
chart for R-134a. to be sure the plate can reach the thermostat cutout temperature.
A poorly insulated box will require a higher pressure setting to obtain any freezing and
will never freeze rock hard.