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 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 off 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
SYSTEM OPERATION-KDT
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 adjust ed 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 humidifer
and does not add humidity.)
The FOF cycle should be shortened first. This will reduce the
amount of time that the fan remains on following a cooling cycle.
When the unit has completed a cooling cycle, the compressor
and the condenser fan will turn on , but the indoor fan will
continue to run for whatever length of time the customer has set.
The Non 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 .
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,
thereby reducing nuisance tripping of fuse or circuit breaker and
allowing the pressure in the refrigeration system to equalize prior
to starting the compressor.
Once the contactor relay is de-energized, the controller must
wait five minutes before re energizing 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
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.
Safety Features
In the event of a faulty bottle probe, the compressor will cycle ˜
for 10 minutes and on for 40 minutes. “E1” will be displayed on
the screen.
Alarms
See “Alarm Codes” in the Controller Functions chart.
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 39 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.
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