valutazioni - 2, GPA: 4 ( )

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Hot surface igniter If 120VAC is present at hot surface igniter terminals, visually check to see that the igniter is heating (igniter may be viewed through the port in the end of burner tube). The igniter should glow bright red. If the igniter does not heat, replace the hot surface igniter. Ignition control After 45 seconds of hot surface igniter pre-heat, the ignition control will switch 24VAC to the gas control valves. Check for 24VAC output from ignition control across terminals marked “valve” and “valve gnd”. If no voltage is present, replace ignition control. Gas control valves When 24VAC is supplied to the gas control valves, the valve should open. Check for gas pressure at the manifold tap located just before the burner. If there is no pressure, check the incoming gas supply to be sure all manual valves are open and flexible gas hose is properly connected. If gas is present, and the gas control valve is energized, but there is no gas pressure at the burner manifold, replace the gas control valves. Flame will not stay lit Hot surface igniter Six seconds after the gas valve opens, ignition must Impinger II – Advantage Digital Express Service Manual - Domestic occur. If flame is not detected, the ignition control will shut off and lock out. To reset the ignition control, turn off the power switch for 45 seconds, then turn the switch on to re-try ignition. The ignition control requires a minimum of 0.8 DC microamps to prove flame. To check flame sensing operation, connect a digital multimeter (capable of measuring DC microamps) between the “ground” terminal on ignition control and the ground lead. NOTE: This is a current measurement and the meter must be connected in series If these readings are not achieved, replace hot surface igniter. NOTE: The DC microamp test must be conducted with the oven in low flame (bypass) operation. Set the temperature control to the lowest setting. Power supply If there is sufficient microamp current, but the flame will not stay lit, check for proper polarity of the 120VAC power supply. Ignition control If there is sufficient microamp current, and the 120VAC polarity is correct, but the flame will not stay lit, replace the ignition control. NOTE: Check for proper ground connection on ignition control. NOTE: Flame should be on at this time Low flame is on, Control transformer Check for 120VAC supply to the primary of the but no main flame control transformer. If no voltage is present, trace wiring back to the main power switch. If voltage is present, check for 24VAC at the transformer secondary. If there is primary voltage, but no secondary voltage, replace the control transformer. Oven control Check for 24VAC supply to control. If no voltage is present, trace wiring back to control transformer. If 24VAC is present, check for a read-out on the display. If there is 24VAC supplied, but there is no read-out on the control display, replace the oven control. If there is a read-out on the control, set the control to maximum temperature (see installation operations manual for temperature adjustment). With the control set at maximum temperatur...

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