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
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.
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:
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.
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).
Refrigeration & Defrost Cycle
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 30
minutes).
