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

 

 

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.

 

 

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

-Connect the red (+) meter lead to the free

-end of the flame signal ground wire.

 

the ground terminal of the ignition module

 

-Connect the black (-) meter lead to the quick

 

(DO NOT remove the existing ground lead

 

-connect flame signal ground wire terminal

 

from the ignition module).

 

-on the ignition module.

 

 

5.

Apply power to the ignition module.

4. From the off or cooling down mode, select a

 

 

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 20-25 VAC, the ignition module is damaged or defective and must be replaced (page A-14).

Domestic

International

25 VAC

TH/W

 

 

25 V

V2 GND

 

 

Alarm

Not Used

 

 

Valve

V1/PV1

 

 

Valve

V2 GND

 

 

Ground

V2 GND

 

 

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 34-35.

MULTIPURPOSE METER

ALARM

VALVE

VALVE

GND

RED (+)

BLACK (-)

Figure 35: Measuring Microamps

Page 48
Image 48
Turbo Chef Technologies 3240 Shut off the gas supply, Will isolate the burner spark rod from, From the ignition module

3240 specifications

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