2 8 OVEN SYSTEMS
1. | Shut off the gas supply. | Testing Procedure for Testing Flame Rectification | |
2. | Disconnect the wire spark cable from the | Figure 35 | |
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| stud terminal of the ignition module. This | 1. Ensure the oven is in the off or cooling down | |
| will isolate the burner spark rod from the | mode (page 10). | |
| ignition module. | 2. Remove the flame signal ground wire from | |
3. | Using a different wire spark cable (ensure | the ignition module. | |
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| that the cable is not damaged in any way), | 3. Connect a DC multipurpose meter that is | |
| attach one end to the stud terminal of the | able to read micro amps (uA) in series with | |
| ignition module. | the flame signal ground wire. | |
4. | Touch the other end of the ignition cable to |
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| the ground terminal of the ignition module | ||
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| (DO NOT remove the existing ground lead | ||
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| from the ignition module). | ||
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5. | Apply power to the ignition module. | 4. From the off or cooling down mode, select a | |
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| cooking profile to operate the oven burner. |
6.Before the ignition module goes into a safety lockout (6 seconds), slowly move the end away from the ground terminal. A spark length of 1/8” (3 mm) or more indicates good ignition voltage. If there is no arc or the maximum spark length is less than 1/8” (3 mm), and the input voltage to the ignition module is
Domestic | International |
25 VAC | TH/W |
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25 V | V2 GND |
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Alarm | Not Used |
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Valve | V1/PV1 |
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Valve | V2 GND |
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Ground | V2 GND |
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Figure 34: Ignition Module Terminal Differences
5.The reading must be above 1.5 DC uA and it must be steady.
The oven control system uses basic flame rectification to verify if a flame is present. The micro amps must be greater than 1.5 DC uA. If the reading is below 1.5 DC uA or is not steady, remove the burner assembly and investigate the cause. Look for a loose ignition/sensor wire, or defective sensor assembly. Follow the troubleshooting steps outlined on pages
MULTIPURPOSE METER
ALARM
VALVE
VALVE
GND
RED (+)
BLACK
Figure 35: Measuring Microamps
