Forced Pull-Down (Forced Compressor Start); Forced Defrost - Viking VDSC367 Service Notebook

Operation
This set point temperature is not adjustable
and is programmed from factory.
The time duration is adjustable in Program
Mode B, range is 1 to 20 hours in 1 hour
increments.
When MAX REF is selected, the display
illuminates "MAX REF" as shown above. The
temperature display will move towards that
set point temperature (33
down.
Max Ref will terminate at the conclusion of the
time duration or if another mode is selected,
or if the temperature is manually changed by
pressing "HIGHER or LOWER" tabs. Max Ref
can also be terminated by again pressing and
releasing "MAX REF".
The conclusion or termination of this mode is
confirmed by "MAX REF" extinguishing from
display
Forced Pull-Down (Forced compressor
start)
To enter Forced pull-down, first
press and release "ACTIVATE
CONTROLS", then press and hold
"LOWER" pad, then press and hold
"DISPLAY OFF" pad also until you
get an audible consisting of three
beeps.
This causes the control to
immediately energize the
appropriate outputs in an effort to reach both
of the cut-out temperatures (refrigerator and
freezer).
8
F) as the unit pulls
o
ACTIVATE
CONTROLS
LOWER
DISPLAY
OFF
This function will ignore compressor dwell
time and cause immediate compressor start
up in the high speed mode (115HZ).
Forced pull-down will terminate after both
cut-out temperatures are met, or if a defrost
or forced defrost is initiated, or if an extended
power loss occurs.

Forced Defrost

To enter Forced defrost, first
press and release "ACTIVATE
CONTROLS", then press and hold
"HIGHER" pad, then press and hold
"DISPLAY OFF" pad until you get an
audible consisting of three beeps.
This causes the control to
immediately suspend all
temperature control operations
and start a defrost cycle, regardless of
compressor dwell time and defrost start delay.
If defrost terminator temperature is satisfied
defrost heaters will come on at this time for a
normal defrost cycle.
Forced defrost will terminate when defrost
terminator opens (completion of cycle defrost)
or if forced pull-down is initiated or if there is a
long power loss..
When forced defrost is initiated the
temperature numbers are replaced with
"dEF" in the seven segment displays, as
shown above. When defrost is complete the
displayed "dEF" will again be replaced with
displayed temperature numerals.
ACTIVATE
CONTROLS
HIGHER
DISPLAY
©2012 Viking Preferred Service
OFF