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SYSTEM OPERATION
The cooling system is equipped with the hardware needed to support a 24-volt air conditioning thermostat (not included).
Initial Start-Up
Set the thermostat to COOL and fan switch to AUTO. Lower
the setpoint to the desired cellar temperature. (A temperature
of 55°F is the recommended setpoint.) See thermostat
instructions for details.
Normal System Cycle
The thermostat should turn the cooling system on when it
senses a temperature one (1) degree higher than the setpoint.
See thermostat instructions for details.
Anti-Short Cycle
Most thermostats have a safety feature that will prevent
the condensing unit from cycling on and off within a short
period of time. During the anti-short cycle, the condensing
unit will typically remain off for 5-7 minutes. See thermostat
instructions for details.
Fan Operation
If the fan switch on the thermostat is in the AUTO position, it
will run only during the cooling cycle. If the fan switch on the
thermostat is in the ON position, the fan will continuously run
until the switch is set back to the AUTO position.
Operation in Low Ambient Temperatures
The condensing unit comes equipped with a LAC (Low
Ambient Control). The LAC is a three-way modulating valve that
responds to discharge pressure. When the discharge pressure
falls below the valve's dome pressure, the valve modulates
open to the discharge port which allows discharge gas to
bypass the condenser. Mixing the discharge gas with the liquid
creates high pressure at the condenser outlet, reducing the
flow and causing liquid to backup in the condenser. Flooding
the condenser reduces the area available for condensing.
This reduction in condenser surface area results in a rise in
condensing pressure during cold ambient conditions.
Page 42 | 1-800-343-9463
The condensing unit controller is preset at the factory. The
cut-in pressure is preset to 25psi and the cut-out pressure at
15psi. During low ambient temperatures (40°F or below), it will
be necessary to adjust the cut-in pressure to 10-15psi (15psi
is preferred) and the cut-out to 5psi to ensure compressor
startup. See page 43 for instructions on adjusting the cut-in
and cut-out pressures of the condensing unit.
NOTE: To ensure correct system operation, the 24V thermostat
must be placed inside the wine cellar, preferably in a central
location away from any airflow.
020519
QS
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