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III.
Low ambient condition kit (if applicable)
A.
The crankcase heater
The crankcase heater is installed at the bottom of the compressor and shall be
turned on all the time. The heater is self-regulated.
B.
The condenser fan control
The condenser fan control is installed at the high side. It closes on rise of
pressure. It is necessary to adjust the setting in the field to avoid fan short cycle.
Head pressure setting: Cut in=170 psig; Cut out=110 psig; Differential=60 psig;
Fig. 12 Condenser Fan Cycle Control
2) The subcooling at the condensing unit shall be around 10°F. The charge may
be complete when there are no more bubbles forming in the liquid indicator.
3) The head pressure shall be 120 ~ 150 psig at 70 ~ 90 °F condensing unit
operating temperatures.
4) The evaporator’s constant pressure expansion valve is set around 30 ~ 35
psig (35 ~ 40°F) at factory. This pressure setting gives a dew point to
maintain the proper humidity for storing wine.
5) The temperature split across the evaporator shall be 8 ~ 10°F at 55°F wine
cellar temperature.
6) Again, you must verify if the superheat at the evaporator unit is 9 ~ 18°F at
55 °F ~ 65 °F wine cellar temperatures.
7) If the superheat is high, check the subcooling first to see if the refrigerant
charge is sufficient. If the charge is not sufficient, add more refrigerant (Liquid
must always be charged into the hide side when the compressor runs). If the
charge is good, then increase the evaporator suction pressure by turning the
hex nut (5/16”) clockwise.
