Solid State Temperature Control (SSTC)
3 | Fault Detection |
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3.1 High Limit Trip or “Heat Failure”: |
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This control monitors the appliance response to heat demand signals. |
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Under normal conditions the heat feed back indicator follows the heat |
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demand indicator. When the appliance fails to respond, the heat feed |
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back indicator will remain off. Typical causes are: |
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High Limit device is tripped and needs to be reset. |
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On gas appliances, a substandard pilot flame, or ignition module |
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| problem may be indicated. |
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| For electric appliances, an open line fuse may be indicated. | Normal operation when HFB indicator |
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| follows Heat Demand. |
Heat Demand without Heat Feed Back
is a Fault indication.
3.2 Open or Shorted Probe:
This control continually monitors the condition of the thermal sensing probe. If this probe is detected out of range (open or shorted), heat control activities are suspended. The heat feed back indicator will flash 3 times, pause, and repeat.
This condition requires repair of the probe, or related wiring.
HFB indicator flashes 3 times, pauses,
then repeats.
4 Field Calibration
If field calibration is deemed necessary, follow these steps:
Allow appliance to heat to set point, and allow 30 minutes to stabilize.
Measure the vat center oil temperature. Compare this with the knob pointer scale.
To reposition the knob, pry off the cap of the knob with a sharp knife blade.
Without turning the shaft, loosen the
Tighten the
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