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TWIN MG 092223
SYSTEM OPERATION KDT
Initial Start-Up
When the unit is plugged in and power is sent to the
controller, a beep will sound, conrming that the control-
ler 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 o 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 o”
functions. (The cooling system is not equipped with a humidier
and does not add humidity.)
The FOF cycle should be shortened rst. This will reduce the
amount of time that the fan remains o following a cooling cycle.
When the unit has completed a cooling cycle, the compressor
and the condenser fan will turn o, 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.
Anti-Short Cycle
The Anti-Short Cycle ensures that the unit will remain o for a
period of ve 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 contactor relay is de-energized, the controller must
wait ve minutes before re-energizing the relay. This prevents
the compressor from repeatedly turning o 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 to complete.
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 o 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 fan cycle switch,
which controls the condenser fan operation to maintain optimal
system pressures. During cold ambient temperatures when
the high side pressure falls below 75 psi, the fan cycle switch
will open and the condenser fan will be shut o to maintain
minimum head pressure. Once the pressure reaches 110 psi,
the fan cycle switch will close and allow the condenser fan to
continue operation.
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 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
o for 10 minutes and on for 40 minutes. “E1” will be displayed
on the screen.
Alarms
See “Alarm Codes” in the Controller Functions chart.
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