6000XL Series Service and Installation Manual
5
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Delfield
™
®
OPERATION
OPERATION
Electronic Temperature Control
Operation:
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. E 1. 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.
Refrigerator:
The control is located in the control box in the top of the
refrigerator behind the removable louvered panel on the left
side. It is factory set at mid-range to maintain about 38˚F
(3˚C) 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.
Freezer:
The control is located in the control box in the top of the
refrigerator behind the removable louvered panel on the left
side. It is factory set at mid-range to maintain about -3˚F
(-18˚C) 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.
Energy Saver Switch
The energy saver switch is a rocker switch located next to
the thermostat knob. The switch controls power to the frame
heater to minimize condensation around the door opening.
Press the switch to the “0” position to conserve energy. If
excessive condensation is observed on the door opening,
press the switch to the “-” position, (red portion of the rocker
will be visible).
Refrigeration & Defrost Cycle
Refrigerator:
Whenever the refrigerator is plugged in, and the control
has completed initializing, the evaporator fans will run
continuously and the digital temperature will display box
temperature in degrees F. The temperature control will cycle
the compressor and condenser fan motor to maintain box
temperature at the control setting.
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
30 minutes).
Freezer:
Whenever the freezer is plugged in, and the control
has completed initializing, the evaporator fans will run
continuously. After evaporator coil has reached operational
temperature, the digital temperature will display box
temperature in degrees F. The temperature control will cycle
the compressor and condenser fan motor to maintain box
temperature at the control setting.
Freezer Defrost
The control also monitors compressor total running time
and will enter a defrost cycle after total compressor running
time is greater than 4-hours since the last defrost cycle OR
if evaporator coil temperature drops below -34˚F (indicating
excessive frost on the coil).
When the control enters the defrost mode, it switches OFF the
evaporator fan motor, compressor, and condenser fan motor,
and switches ON the defrost heater to warm the evaporator
coil thereby melting all frost accumulated during the previous
refrigeration cycle. The digital temperature display will now
read dEF. The control will continue the defrost cycle for a
MINIMUM of 8 minutes and a MAXIMUM of 30 minutes
depending on the amount of frost accumulated on the
evaporator coil.
After the defrost cycle is complete, the control returns to a
normal refrigeration cycle, however the evaporator fan motor
will not switch on for 2 minutes AFTER the compressor and
condenser fan motor have begun operating. The digital
temperature display will continue to read dEF until the
evaporator has returned to normal freezing temperatures (up
to 30 minutes).
