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CCM9000
101017
Pump Down Cycle
CellarCool’s twin split systems operate on a pump down cycle which differs from traditional air conditioners . As such, there is no
wiring between the condensing unit and evaporator units . CellarCool twin systems utilize a solenoid valve on the liquid line in
each evaporator unit and a low-pressure switch on the suction line at the condensing unit . When the thermostat calls for cooling,
the solenoid valve opens, permitting the flow of refrigerant to each of the evaporator coils . Once the pressure of the low side of
the system rises above 20 psig, the low-pressure switch then signals the compressor to cycle on .
When the cellar reaches the desired temperature and the thermostat is satisfied, the solenoid will close, stopping the liquid
refrigerant flow to the TXV valve . The compressor will continue to operate until most of the refrigerant on the low side boils off
and is pumped through the compressor into the condenser coil and receiver . As the suction pressure falls below the pressure
control setting, the low-pressure switch will signal the compressor to cycle off . Most of the refrigerant is now stored between the
condensing unit and receiver .
…………………………………………………………………………………………………
WARNING: Do not utilize a ground fault interrupter, as it will prevent
the unit from drawing the necessary amperage to start the unit .
QUICK START GUIDE*
*Further system operation information is available on page 37.
Liquid Line King Valve
This location is used to charge the system with liquid refrigerant
and identify the high side pressure of the system .
Calculating Subcooling
To determine the subcooling of the system, calculate the difference
between the high side pressure of the system (converted to
temperature) and the temperature of the liquid line . The temperature
of the liquid line will be taken at the outlet of the receiver .
*Saturation temp — liquid line temp
5-9°F
SUBCOOLING REQUIRED FOR WARRANTY APPROVAL
TXV
The TXV is preadjusted at the factory. If the superheat is not
within 8-12°F, the TXV will need to be adjusted.
ADJUSTING THE TXV
Use a 5⁄32” hex key to remove the cap from the TXV superheat
adjustment port. With the cap removed, insert the hex key into
the superheat adjustment port. Increase superheat by turning
the hex key clockwise. Decrease superheat by turning the hex
key counterclockwise.
TXV Adjustments
A.
A TXV adjustment may be necessary based on ambient temperatures in the cellar and at the condensing unit .
B.
Superheat must be measured at EACH evaporator .
C.
Adjust the TXVs for EACH unit until the superheat is 8-12°F .
(Total superheat should be 20-30°F .)
D.
Under normal operation, with the wine cellar at 55°F and the ambient temperature at 85°F, the low side pressure should be
between 78-82 psig and the high side should be between 300-330 psig .
