AutoFire® Kiln Controller User’s Guide
37
Appendix D – Vent Fan Options Available
Vent fan control is an Option for which the controller is configured at the factory when ordered. Control of
electrical power to the vent fan needs to be controlled by the controller by turning a relay on or off. Therefore,
either the kiln or the controller power box needs to be wired with an electrical connection for the vent to be
plugged or wired into this relay. This option may not be installed on your AutoFire® controller.
Vent Fan Modes
The user may specify the mode of operation through the OPTIONS menu by selecting any one of the following
modes:
Cone Program
Off Vent fan “off ” all the time
On Vent fan “on” all the time
OptA Option A temperature thresholds
OptB Option B temperature thresholds
User Program
Fn # Vent fan can be turned “on” or “off” during each ramp segment of user program.
Description of Vent Fan Modes:
For vent fan operation for increasing ramps For vent fan operation for decreasing ramps
[T1] the vent fan turns on at 100F. [T3] the vent fan turns on at 1000F.
[T2] the vent fan turns off at 1450F. [T4] the vent fan turns off at 300F.
Mode: OPtA
The vent fan shall be “on” during increasing (heating) ramps of an active firing cycle if:
Kiln temperature is greater than or equal to T1 and less than T2.
The vent fan shall be “on” during decreasing (cooling) ramps of an active cycle if:
Kiln temperature is less than T3 and greater than or equal to T4.
If the kiln temperature is invalid (open thermocouple for example), the vent shall be “off”.
Mode: OPtB
The vent fan will be “on” during increasing ramps (heating) of an active firing cycle if:
Kiln temperature is greater than or equal to T1.
The vent fan is “on” during decreasing ramps (cooling) of an active cycle if:
Kiln temperature is greater than or equal to T4.
If the kiln temperature is invalid (open thermocouple for example), the vent fan shall be “off”
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