Solid State Control - Vulcan-Hart GRC35 Service Manual

GR SERIES GAS FRYERS - TROUBLESHOOTING

SOLID STATE CONTROL

The following alarms take precedence over any other controller mode or function (except drain valve open).
ALARMS
OPEN PROBE
SHORTED PROBE
HI TEMPERATURE
IGNITION STATUS
DRAIN VALVE INTERLOCK (DVI)
If an open probe is detected, the heat demand (heat on) and basket lift
outputs are disabled. Any cooking in progress is cancelled and all
operator buttons are disabled. The display shows "Prob" and the
electronic alarm will sound continuously.
NOTE: A temperature of less than 40°F is an open probe equivalent.
If a shorted probe is detected, the heat demand (heat on) and basket lift
outputs are disabled. Any cooking in progress is cancelled and all
operator buttons are disabled. The display shows "HI" and the
electronic alarm will sound continuously.
NOTE: A temperature of 460°F or greater is a shorted probe equivalent.
If the temperature is greater than or equal to 415°F, the heat demand
(heat on) is disabled. Any cooking in progress is cancelled and all
operator buttons are disabled. The display shows "HI" and the
electronic alarm will sound continuously. Normal fryer operation
resumes when the temperature drops below the high temperature alarm
level.
If this input is not active (24VAC = active), the display will show "FIrE"
"OUt" (for gas pilot out). If the input remains inactive for greater than 90
seconds, the display will show "Ign" "LoC" (for ignition lockout), the
electronic alarm will sound continuously, and the controller will be
disabled (all outputs including heat demand off) until power is cycled.
When drain valve is opened, the DVI switch contacts open, and the
24VAC input to the controller is removed. The heat demand (heat on)
and basket lift outputs are disabled. Any cooking in progress is
cancelled and all operator buttons are disabled. The display will
alternate between "drn" "tUrn" "oFF" for 3 seconds each in a continuous
loop.
When the drain valve is closed, the DVI switch contacts close, and the
24VAC input to the controller is restored. The heat demand (heat on)
and all operator buttons will remain disabled; and the display will
alternate between "tUrn" "oFF" for 3 seconds each in a continuous loop
until power is cycled.
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DESCRIPTION
F-25114 Rev.A (07-03)