Filter
Top Products
7
220-VOLT CIRCUIT
A separate 10-amp breaker is required for the 220-volt supply. This circuit powers the
thermostat through a built in transformer. For operation, it is necessary to have power at
all times.
RE-CHARGING OR ADDING REFRIGERANT
Adding refrigerant will not change the suction (low) side pressure. Do not charge more
than 12 oz of R-134a in an empty system. Typical head pressure will be about 25
degrees above air temp. If you are adding refrigerant and exceed the calculated head
pressure you are overcharging and may risk breaking the compressor valves. Do not
adjust the charge to prevent frost back. The return line may be well below freezing in
normal operation. Contact the factory if you have questions.
READING THE SIGHT GLASS
SIGHT GLASS DETAIL
Clear or empty Stationary bubbles Foam (low charge)
A clear sight glass, when the compressor is operating, signifies a sufficiently charged
system. To determine the meaning of "clear", notice the appearance of the RFD sight
glass when the system is at rest with the compressor off. This is a "clear" glass.