6000XL Series Service and Installation Manual
9
For customer service, call (800) 733-8829, (800) 733-8821, Fax (888) 779-2040, www.delfield.com
Delfield
™
®
Cooling Cycle
Defrost Cycle
Compressor On
Compressor Off
Compressor Off
Evap Fan On
Evap Fan Off
Evap Fan On
Evap Fan Off
Evap Fan On
Evap Fan Off
Refrigerator
X
Cycles On 3-Min, Off 3-Min
X
Freezer
X
X
X
Evaporator Fan Matrix
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
digital therostat 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.
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 -30˚F (-34
°
C)
(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).
Service Alert
During normal operation the evaporator fan may cycle
and/or pulse independently of the compressor. Consult
the service manual or contact Technical Support at
1-800-733-8829 if you are unsure of the proper function.
Operation,
continued
