FULL SIZE ELECTRIC CONVECTION OVENS - SERVICE PROCEDURES AND ADJUSTMENTS
| ALTERNATING ON | |||
MENU | DISPLAY |
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| PARAMETER |
| DATA | |
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Celsius_Fahrenheit | C_F |
| F | |
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Guard Band | gb |
| 4000 | |
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Temperature | tcnP |
| OFF | |
Compensation |
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Input Type 1 | InP1 |
| J | |
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Range Low 1 | rL1 |
| 75 | |
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Range High 1 | rH1 |
| 500 | |
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Hysteresis | HYS1 |
| 3 | |
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Calibration Offset | CAL1 |
| 0 | |
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Exit Setup Mode and | set point temperature is | |||
displayed or if call for | ||||
return to Operation | ||||
heat, dashes |
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Mode. |
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displayed. |
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Probe Test
If the oven is not heating or displaying the proper temperature, the temperature probe may be malfunctioning. Determine if the probe is good or causing the operational problem. Temporarily, disconnect the existing probe lead wires from the computer control and connect the lead wires from a known good "J" type thermocouple. Secure the sensing end of the thermocouple near the probe.
Turn the power switch ON and set the dial to 350°F.
If the oven reaches the set temperature and cycles with the temporary thermocouple, then the existing probe is malfunctioning. Replace temperature probe with the correct part and check for proper operation.
Solid State Relay Test
The solid state relays "SSR1 or SSR2" supply power to the blower motor "high" or "low" fan speed terminals when the SSR is energized by the output voltage from the computer.
To test solid state relay "SSR1" (high fan speed), the computer control should be in the "Normal Cooking Mode". To test solid state relay "SSR2" (low fan speed), the computer control should be in the "Cook & Hold Mode".
1.Remove the right side panel as outlined under
"COVERS AND PANELS".
2.Turn the power switch ON.
A.If the blower motor comes on, the SSR is functioning properly.
B.If the blower motor does not come on, proceed to step 3.
3.Check for +5 VDC on the input side of SSR (terminals 3 & 4).
A.If +5 VDC is present, continue to step 4.
B.If no voltage is present, computer control is not functioning properly.
4.Check for proper input voltage on the load side of SSR terminal 1 and the power connection on the other side of the supply.
A.On 208 & 240 volt ovens, the supply connection is on the terminal block (L2 for single phase, L3 for three phase).
The measured voltage should be identical to the supply.
B.On 480 volt ovens, the supply connection is on the secondary side of the 480V transformer, terminal X4 (wire # 79).
The measured voltage should be 240 volts.
5.If input voltage is correct on the load side of SSR terminal 1, proceed to step 6.
A.If input voltage is not correct, find the source of the problem.
6.Check output voltage on the load side of SSR terminal 2.
Page 25 of 60 |
| F25105 (December 2001) |
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