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Impinger I -–1000 Series Service Manual - Domestic
38
TEMPERATURE CONTROL POTENTIOMETER – REPLACEMENT
1. Remove control panel top and front cover.
2. Remove one screw from control knob guard and move guard to one side.
3. Remove knob and locknut on control pot. shaft and push out.
4. Remove three (3) wires from temperature control board. Note wire numbers and location.
5. Reassemble in reverse order.
MERCURY CONTACTOR
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Disconnect contactor wires and mark for reinstallation.
4. Remove screws from mounting bracket and replace contactor.
NOTE: Be sure contactor is not mounted upside down as this will cause a constant on condition.
5. Reassemble in reverse order.
THERMOCOUPLE- REPLACEMENT
1. Remove control panel top and front cover.
2. Remove cover from relay box.
3. Slide thermocouple out of oven chamber.
NOTE: Remove conveyor and bottom fingers to aid in removal and installation of thermocouple.
4. Remove two (2) wires from temperature control board. Make note of wire numbers or color and location
for reinstallation.
5. Reassemble in reverse order making sure the metal end on the thermocouple is securely in the wire
form in the oven chamber.
THERMOCOUPLE MEASUREMENT CHART:
EXPLANATION: The junction temperature is the ambient air temperature where the thermocouple fastens
to the electronic temperature control board.
O V E N T E M P
200°F
250°F
300°F
325°F
350°F
400°F
425°F
450°F
500°F
550°F
600°F
J
90°F 3.26 4.77 6.30 7.06 7.83 9.37
10.14 10.91 12.46 14.00 15.53
U
88°F 3.32 4.83 6.36 7.12 7.89 9.43
10.20 10.97 12.51 14.05 15.59
N
86°F 3.37 4.88 6.41 7.17 7.94 9.49
10.26 11.03 12.57 14.11 15.65
C
84°F 3.43 4.94 6.47 7.23 8.00 9.54
10.31 11.09 12.63 14.19 15.71
T
82°F 3.49 5.00 6.53 7.29 8.06 9.60
10.37 11.14 12.69 14.23 15.76
I
80°F 3.55 5.06 6.59 7.35 8.12 9.66
10.43 11.20 12.74 14.28 15.82
O
78°F 3.60 5.11 6.64 7.40 8.17 9.72
10.49 11.26 12.80 14.34 15.86
N
76°F 3.66 5.17 6.70 7.46 8.23 9.77
10.55 11.32 12.86 14.40 15.94
75°F 3.69 5.20 6.73 7.49 8.26 9.80
10.57 11.35 12.89 14.43 15.97
74°F 3.72 5.23 6.76 7.52 8.29 9.83
10.60 11.37 12.92 14.46 15.99
72°F 3.78 5.29 6.82 7.58 8.35 9.89
10.66 11.43 12.97 14.51 16.05
T
70°F 3.83 5.34 6.87 7.63 8.40 9.95
10.72 11.49 13.03 14.57 16.11
E
68°F 3.89 5.40 6.93 7.69 8.46 10.00 10.78 11.55 13.09 14.63 16.17
M
66°F 3.95 5.46 6.99 7.75 8.52 10.06 10.83 11.61 13.15 14.69 16.23
P
64°F 4.01 5.52 7.05 7.81 8.58 10.12 10.89 11.66 13.20 14.74 16.28
62°F 4.06 5.57 7.10 7.86 8.63 10.18 10.95 11.72 13.26 14.80 16.34
60°F 4.12 5.63 7.16 7.92 8.69 10.24 11.01 11.78 13.32 14.86 16.40