ELECTRONIC TEMPERATURE CONTROL – CALIBRATION
. Place the thermocouple of your test meter through a finger hole in the top center of the oven.
. With temperature dial fully counter clockwise, align red line on dial over the “CAL” mark on temperature scale and tighten dial knob.
. Turn temperature dial fully clockwise, adjust pot on temperature control to achieve 575° F on temperature meter. (There are two adjustment pots on control, adjust pot that is closest to the edge of the board.)
. Set dial to 500° F. Adjust dial to match actual temperature.
. Seal adjustment pot with glyptol or nail polish.
TEMPERATURE CONTROL POTENTIOMETER – REPLACEMENT
. Shut off power at main breaker.
. Remove control panel top and front cover.
. Loosen two allen screws and remove knob by sliding off shaft.
. Remove mounting nut from potentiometer shaft and remove potentiometer.
. Disconnect potentiometer wires from temperature control and mark for reassembly.
. Reassemble in reverse order and check system operation.
HEAT LIGHT – REPLACEMENT
. Shut off power at main breaker.
. Remove control panel top and front cover.
. Remove two wires from light and mark for reassembly.
. Grasp body of light and slide sideways to remove light.
. Reassemble in reverse order and check system operation.
IGNITION CONTROL – REPLACEMENT
. Shut off power at main breaker.
. Remove control panel top and front cover.
. Remove front portion of control from base by releasing tabs on sides of control and pulling control from base.
. Remove wires from terminal strip on control base and mark for reassembly.
. Remove two mounting screws and remove control base.
. Reassemble in reverse order and check system operation.
GAS VALVE – REPLACEMENT AND ADJUSTMENT
. Shut off power at main breaker and disconnect gas supply.
. Disconnect gas piping from back of unit.
. Remove four screws from the incoming piping nipple mounting bracket. Remove incoming piping nipple.
. Remove all wires from gas valve and mark for reassembly.
. Disconnect pilot tube from gas piping. Disconnect pipe union and remove gas valve.
. Remove piping from gas valve.
. Reassemble in reverse order and check system operation. Check all gas line fittings for leaks.
. Check for proper adjustment of gas pressure switch. Switch should be set as follows: 10 on dial for Nat. gas, 27 for LP or 4.5 for town gas. Adjust as needed.
. Check and adjust manifold pressure. Remove pressure tap at burner manifold and install manometer. Adjust gas pressure as follows: 3.5” WC for Nat. gas, 10” WC for LP or 2.0” WC for town gas.
. If needed, check gas filter by removing cover plate on side of gas valve and sliding filter out of valve. Reassemble in reverse order and check system operation. Check for gas leaks.
18 | Impinger II – |