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WM&FD TWIN
051019
SYSTEM OPERATION
Initial Start-Up
When the unit is plugged in and power is sent to the
controller, a beep will sound, confirming that the controller is
getting power. All LEDs on the display will blink three times.
Three dashes will then appear on the screen. All display LEDs will
then blink three times. Once the controller has gone through
the initial startup process, and all LEDs have cycled, the home
screen will be displayed.
Setpoint
The setpoint is preset at the factory to 55°F. It can be adjusted by
the customer between 50–70°F in one-degree increments.
Indoor Fan Operation
The indoor fan will run when the controller is calling for cooling
and turn off once the cooling cycle has ended. During the
cooling cycle, the system will remove some relative humidity
from the cellar. Some of the humidity that was removed can be
reintroduced into the cellar by adjusting the “fan on” and “fan off”
functions. (The cooling system is not equipped with a humidifier
and does not add humidity.)
The FOF cycle should be shortened first. This will reduce the
amount of time that the fan remains off following a cooling cycle.
When the unit has completed a cooling cycle, the compressor
and the condenser fan will turn off, but the indoor fan will
continue to run for whatever length of time the customer has
set. The Fon function may then be lengthened to allow the fan
to run longer and reintroduce moisture from the evaporator coil
back into the wine cellar.
For more information about fan settings, refer to the User Menu
on page 47.
Anti-Short Cycle
The Anti-Short Cycle ensures that the unit will remain off for a
period of five minutes after the unit has reached the setpoint.
This allows the pressure in the refrigeration system to equalize
prior to starting the compressor.
Once the solenoid relay is de-energized, the controller must
wait five minutes before reenergizing the relay. This prevents
the compressor from repeatedly turning off and on. If the unit
is calling for cooling during this time, the compressor icon will
blink, indicating that cooling is needed but the controller is
waiting for the Anti-Short Cycle delay.
Anti-Frost Cycle
When the evaporator probe senses a temperature of 26°F for
a duration of one minute, an Anti-Frost Cycle will be initiated.
This will shut down the compressor, allowing the evaporator fan
to run and melt any frost accumulation on the coil. While the
Anti-Frost Cycle is running, “dEF” will be displayed on the screen.
The compressor will remain off until the evaporator coil reaches
40°F, or for a maximum of one hour. The unit will then return to
normal operation.
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.
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 48 for instructions on adjusting the cut-in and cut-out
pressures of the condensing unit.
Digital Display
The display is designed to give the user the ability to adjust
the setpoint, Fon/FOF parameters, and other settings. (See
User Menu on page 47 for more details.) The bottle probe
temperature is displayed by default. “dEF” will be displayed
during an Anti-Frost Cycle. The bottle probe and evaporator
probe temperatures can be accessed by pushing the SET button
and scrolling through “Pb1” (bottle probe) and “Pb2” (evaporator
probe). The light button may be used as an unlock button.
Safety Features
In the event of a faulty bottle probe, the compressor will cycle
off for 10 minutes and on for 40 minutes. “E1” will be displayed
on the screen.
Alarms
See “Alarm Codes” in the Controller Functions chart.
