www.whisperkool.com | Page 17
SC
Series
UNIT OPERATION
Initial Start-Up
When power is applied to the unit, the control will briefly display
all symbols, and the Snow Flake symbol will be displayed (if unit
is calling for cooling). There may be a brief (up to 60 sec.) delay
prior to the evaporator fan turning on. When the evaporator fan
is activated the Fan symbol will display.
APST (Advance Product Safety Technology) is a temperature
control feature for the evaporator fan that comes standard with
all WhisperKOOL units. APST ensures that in the possible event of
a cooling deficiency, the heat from the indoor fan will not raise
the temperature of the wine cellar, which could otherwise have
an adverse effect on the wine-aging process.
Set Point
The set point is set from the factory (WhisperKool) at 55F°. It can
be adjusted by the customer between 50–70F° in one degree
increments.
Cooling Operation
Cooling is activated once the bottle probe senses a temperature
that is 1° greater than the set point. The controller then energizes
the compressor relay which activates the compressor. The
evaporator and condenser fans operate with the compressor. The
unit provides cooling until the bottle probe senses the set point.
At this point the compressor relay is de-energized, which stops
the compressor. The evaporator and condenser fans will continue
to run for one minute to re-introduce any moisture from the
evaporator coil and reduce the head pressure.
Humidity Features
The Fdc parameter can be increased to allow the evaporator
and condenser fans to run for a longer period of time after
the compressor turns off, allowing more moisture to be re-
introduced into the wine cellar.
Anti-Short Cycle
The Anti-Short Cycle ensures that the compressor will remain off
for a period of three minutes after the unit has reached the set
point to allow the pressure in the refrigeration unit to equalize
prior to starting the compressor.
Anti-Frost Cycle
(defrost)
When the evaporator probe senses a temperature of 26F° for
five minutes, the unit will go into Anti-Frost mode. This will shut
down the compressor and allow the evaporator and condenser
fans to run to evaporate any frost accumulation on the coil. The
compressor will remain off until the evaporator coil reaches 40F°,
or for a maximum of ten minutes. The unit will then return to
normal operation.
If the evaporator is not above 26F° after the Anti-Frost sequence
has ended, the red error light will display in the upper right
corner. Alarm “Ad3” will be recorded in the alarm folder,
indicating that the Anti-Frost sequence ended based on time.
The unit will run for five minutes and then enter another Anti-
Frost sequence. This sequence will continue until the evaporator
temperature increases above 26F°.
“Def” will be displayed during Anti-Frost. If the Anti-Frost
sequence is less than five minutes, the control will not allow the
compressor to start until five additional minutes have elapsed.
This is to prevent short cycling of the compressor.
Holding down the up button for approximately five seconds
manually starts the Anti-Frost sequence, but only if the
evaporator is below 40F° (defrost end temperature). If the
evaporator is above 40F°, the display will blink three times and
continue normal operation.
Bottle Probe Failure Protection
In the event that a bottle probe should fail, the APST (Advance
Product Safety Technology) will automatically transition the
refrigeration compressor cycles to a pre-determined time series
(based on detailed laboratory testing), which will ensure that the
product is kept within the safe range.
Display
The bottle probe temperature is displayed by default. “Def” is
displayed during Anti-Frost. The bottle probe, evaporator
probe, and condenser probe temperatures can all be accessed
by pushing the SET button and scrolling through “PB1” (bottle
probe), “PB2” (evaporator probe), and “PB3” (condenser probe).
Safety Features
Once the compressor 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 symbol will
blink, indicating that cooling is needed but the control is waiting
for the Anti-Short cycle delay.
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.
If the condenser temperature reaches 145F°, the compressor will
shut down. The red alarm light will be displayed in the upper
corner of the display. “COH” will be displayed on the screen. The
evaporator and condenser fans will continue to run until the time
set by the FDC parameter has elapsed. The unit will continue
normal operation once the condenser has reached 135F°.
Alarms
See Alarm Codes in the Controller Function chart on page 19.
