Specifications

16
Deleld
These instructions are applicable to most models,
The electronic temperature control constantly monitors box
temperature as well as evaporator coil temperature to maintain
consistent product temperatures. The control also sends
temperature readings to the digital temperature display. The
control circuits continually self-check and if an error occurs,
the digital display will switch from temperature read-out to
error read-out, i.e. E1. Even when an error is displayed, the
refrigeration and controls system should continue to function,
however not at optimal performance. Whenever the display
has an error read-out, Delfield Service should be contacted.
At initial start-up or anytime power is disconnected, then
reconnected to the unit, the control will delay all operations for
a short time (up to 10 minutes.) While in this delay period, the
control initializes the control parameters and confirms that the
temperature sensors and circuits are operational. The digital
temperature display will not display temperature OR errors until
the self-check is complete and the control has switched on the
evaporator fan motor, compressor and condenser fan motor.
Regarding Freezers: After initializing, the control will
immediately enter a DEFROST mode and the display
will read DEF. The compressor and condenser fan
as well as the evaporator fan will remain off until
initialization defrost is complete. This initial defrost
cycle may take up to 15 minutes to complete, at which
time the freezing cycle will begin. The display will
continue to read DEF for an additional 30 minutes
before displaying temperature.
The control is located in the control box in the top of the unit
behind the hinged louvered front panel. Refrigerators are factory
set at mid-range to maintain about 38ºF (3ºC) box temperature.
Freezers are factory set at mid-range to maintain about 3ºF
(-18ºC) box temperature. To adjust for colder temperatures,
turn the knob clockwise. For warmer temperatures, turn the
knob counter-clockwise. Turn the knob fully counter-clockwise
to turn the refrigeration system off. Never turn the knob more
than 1 dial number and always allow 8 hours for temperature
stabilization before making any additional adjustments.
Temperature Alarm:
The alarm will flash "HI" or "LO" 90 minutes after the unit has
reached its alarm temperature point or after any power interruption
if the temperature is above or below the alarm set points.
Refrigerators are factory set at mid-range to maintain about 38ºF
(3ºC) box temperature. The high refrigerator temperature point
is 50°F (10°C). The low refrigerator temperature point is 25°F
(-4°C). Freezers are factory set at mid-range to maintain about 3ºF
(-18ºC) box temperature. The high freezer temperature point
is 20°F (-7°C). Freezers do not have a low temperature point.
Refrigerator:
Whenever the refrigerator is plugged in, and the control has
completed initializing, the digital thermostat will display box
temperature. The temperature control will cycle the compressor,
evaporator fan motor and condenser fan motor to maintain box
temperature at the control setting. See evaporator fan matrix
for more information.
Refrigerator Defrost
The temperature control also monitors the evaporator temperature
and will turn off the compressor and condenser fan motor when
needed to allow accumulated frost on the evaporator to clear.
During this defrost cycle, the digital temperature display will
read dEF. After the defrost cycle is complete, the temperature
control will return to a normal cooling cycle, but the display
will continue to read dEF until the evaporator returns to normal
cooling temperatures (up to 15 minutes).
Power Switch
Select units are equipped with a power disconnect switch located
next to the energy saver switch and thermostat control knob. Switch
must be in the “on” position for the unit to operate. On freezers, if
the switch is turned off, then returned to the on position, the unit
will enter a defrost cycle and the display will read “Def.”
Energy Saver Switch
The energy saver switch is a rocker switch located next to the
thermostat knob that controls the amount of heat applied to the
door perimeter. The normal operating position for this switch is the
ON position, providing the least heat. If excessive condensation
is observed on the door opening, press the energy saver switch
to the OFF position, to increase the amount of heat (red portion
of the rocker switch will be visible). Note: This feature is not
present on Dual Temperature models.
Freezer:
Whenever the freezer is plugged in, and the control has completed
initializing including the initial defrost cycle, the thermostat will
display box temperature. The temperature control will cycle the
compressor, evaporator fan motor and condenser fan motor to
maintain box temperature at the control setting. See evaporator
fan matrix for more information.
Electronic Temperature Control Operation