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6000XL Series Service and Installation Manual
For customer service, call (800) 733-8829, (800) 733-8821, Fax (888) 779-2040, www.delfield.com
6
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.
IMPORTANT NOTE 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.
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 normal operating position for this switch
is the OFF or “0” position. If excessive condensation is observed
on the door opening, flip the energy saver switch to the ON or “-”
position, (red portion of the rocker switch 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 including the initial defrost cycle (also see Electronic
Temperature Control Operation, on this page), 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 Automatic 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).
Freezer Manual Defrost
If a manual defrost is desired, simply unplug the unit for several
seconds, then plug unit back in. This will cause the control to re-
initialize and then enter a defrost cycle.
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).