Sigma 1434-000-E, 1433-000-E, 1456, 1457 service manual With Power OFF Remove 3 prong plug on gas

Page 7

 

 

WITH POWER OFF: Remove 3 prong plug (on gas

 

 

valve) and measure continuity between terminals 2 and

 

 

3. If no continuity, check the following: Proper gas

 

 

pressure supply to gas valve as marked on the oven

 

 

specification plate. Check for proper adjustment of the

 

 

gas pressure switch, 10 for Nat. gas, 27 for LP gas or

 

 

4.5 for town gas. Check the filter in the gas valve for

 

 

blockage or damage. If above checks are okay, but

 

 

pressure switch is still not closed, replace gas valve.

 

Ignition control

Check for supply voltage to ignition control at terminal

 

 

#1 and neutral. If no voltage is present, trace wiring back

 

 

to gas pressure switch. If voltage is present, check for

 

 

supply voltage to burner blower motor at terminal #6 and

 

 

neutral. If no voltage is present, wait 30 seconds, reset

 

 

ignition control, and re- try. If the above fails, replace

 

 

ignition control.

 

Burner reset switch

Switch is normally open. Check to see that the switch

 

 

closes when reset button is pushed. Replace as needed.

 

Burner blower motor

Check for supply voltage to burner blower motor. If no

 

 

voltage is present, trace wiring back to the ignition

 

 

control.

 

 

WITH POWER OFF: Turn blower wheel to check for

 

 

locked rotor.

 

 

If supply voltage is present and motor does not run,

 

 

replace burner blower motor.

 

Burner blower motor air

Check for supply voltage switching to terminal NO as the

 

pressure switch

air pressure switch closes. Check for air tube blockage

 

 

or misalignment, adjust air pressure switch. If the above

 

 

fails, replace air pressure switch.

 

Spark generator

After a pre-purge time of 30 to 60 seconds after burner

 

 

blower motor starts, check for supply voltage to spark

 

 

generator. If voltage is not present, check burner reset

 

 

switch. If voltage is still not present, replace ignition

 

 

control. If voltage is present, visually check for spark at

 

 

igniter.

 

Igniter/sensor assembly

Check for visible damage to the igniter/sensor assembly.

 

 

If there is no visible damage to the components, and no

 

 

spark, replace the spark generator. If there is visible

 

 

damage to the igniter/sensor assembly, replace. Also

 

 

check for frayed or damaged wires in burner tube.

 

Gas valve

Check for supply voltage to gas valve. If no voltage is

 

 

present, check reset button. Check all connections for

 

 

tightness. If there is still no voltage at the gas valve,

 

 

replace ignition control. If there is voltage present, check

 

 

for gas pressure at gas pressure tap located in gas

 

 

piping. If there is no gas pressure, replace gas valve.

Flame will not stay on

Flame sensor

Check for flame sensor operation, connect a digital

 

 

multimeter (capable of measuring DC microamps)

 

 

between the flame sensor wire and terminal #1 on the

 

 

ignition control. Sensor current is to be 3 microamps,

 

 

minimum. If these readings are not achieved, replace

 

 

igniter/sensor assembly. Also check for any type of

 

 

damage to flame sensor wire and connections.

 

 

NOTE: The DC microamp test must be conducted with

 

 

the oven in low flame (bypass) operation.

 

Power supply

Set the temperature to the lowest temperature setting. If

 

 

there is sufficient microamp current, but the flame will

 

 

not stay on, check for proper polarity of the power

 

 

supply.

 

Ignition control

If there is sufficient microamp current, and there is

 

 

proper polarity of the power supply, but the burner will

Impinger I – Adv Digital – Gas Service Manual – International

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Contents Impinger Conveyor Ovens LP GAS Power SupplyTemperature Control NAT. GASSchematic Diagram Serial Number N28654 to N31348 Serial Number N31349 and Above Symptom Possible Cause Evaluation With Power OFF Remove 3 prong plug on gas Not stay on, check the reset button for the ignition Page Belt JAM With Power on and ThermocoupleSensor sensor is located in the conveyor motor Impinger Advantage Series FAN, Main ReplacementCAPACITOR, Motor Replacement Cooling FAN, Control BOX ReplacementBurner Assembly THERMOSTAT, Cooling FAN ReplacementBurner Blower Motor Replacement To Remove the Blower Wheel for Periodic CleaningSWITCH, Burner Reset Replacement Temperature Regulation Valve ReplacementSpark Generator Replacement THERMOSTAT, Oven Cavity HI-LIMIT ReplacementBurner Ignitor Replacement Burner Alarm ReplacementCAPACITOR, Conveyor Motor Replacement Thermocouple Measurment Temperature Millvolts ApproxControl Transformer Replacement Conveyor Drive Motor ReplacementFuse Holder Replacement Pilot Orifice ReplacementON-OFF Switch Replacement Oven Control ReplacementLetter Part Number Description General View Advantage SeriesPage 1456,1457,1433-000-E, 1434-000-E Control BOXPage GAS and Electric Oven BackPage Conveyor 1450 Series Page This page intentionally left blank This page intentionally left blank

1434-000-E, 1457, 1456, 1433-000-E specifications

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