Alarms; High Temp Alarm; Open Thermistor Alarm - Viking VDSC367 Service Notebook

Service Procedures

ALARMS

There are five alarms that signify faulty conditions,
they will each be covered in detail.

1. High Temp Alarm

Freezer High Temp alarm
When the freezer temperature reaches the high temp
level (15 F) ,set in the EEPROM at factory, for a
o
predetermined time (3 hours), also set in EEPROM,
the "HIGH TEMP" indicator will come on and the
"FREEZER" indicator will flash. You will also get
a continuous audible alarm, consisting of a beep
pattern (ON - 0.5 sec, OFF 2 sec's).
Refrigerator High Temp alarm
When the freezer temperature reaches the high temp
level (50 F) ,set in the EEPROM at factory, for a
o
predetermined time (3 hours), also set in EEPROM,
the "HIGH TEMP" indicator will come on and the
"REFRIGERATOR" indicator will flash. You will also
get a continuous audible alarm, consisting of a beep
pattern (ON - 0.5 sec, OFF 2 sec's).
If the condition(s) change and the units temperature(s)
are brought back within limits as described above,
the audible alarm will turn off. The "HIGH TEMP"
and the appropriate zone (Refrigerator or Freezer)
indicator will continue to operate as described above.
To cancel the audible alarm when condition first
occurs, press and release "ALARM OFF", this
will result in shutting off the audible alarm only.
To clear the "HIGH TEMP" and flashing zone light
(FREEZER or REFRIGERATOR), the temperature
must be brought down below the limit temperature
as described in the appropriate zone above. Then
pressing and releasing "ALARM OFF" once will
clear the "HIGH TEMP" off the screen and the zone
indicator will stop flashing.
40

2. Open Thermistor Alarm

The controller will sense an open thermistor condition
within 15 seconds of power on.
Open Refrigerator Thermistor Alarm
When the control senses that the refrigerator
thermistor is open, "oPn" is displayed on the control
along with the zone, "REFRIGERATOR". If the
control was in the Freezer zone when the condition
occurred, it automatically switches over to the faulty
zone ("REFRIGERATOR"). You also receive an
audible alarm consisting of five beeps that occurs
only one time. The visual alarms as described above
will continue until the condition is corrected.
Open Freezer Thermistor Alarm
When the control senses that the freezer thermistor
is open, "oPn" is displayed on the control along
with the zone, "FREEZER". If the control was in
the Refrigerator zone when the condition occurred,
it automatically switches over to the faulty zone
("FREEZER"). You also receive an audible alarm
consisting of five beeps that occurs only one time.
The visual alarms as described above will continue
until the condition is corrected.
The unit will continue to execute temperature control
and defrost operations as required until the condition
is corrected. The control does this through software
programming, acting as if the cut-out temperature
is never reached in the faulty zone, temperature
control in the other zone is unaffected.
The visual alarms will reset by themselves within
15 seconds of the open thermistor condition being
corrected and temperature control reverts back to
normal operation.
©2012 Viking Preferred Service