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Impinger I -–1000 Series Service Manual - International 59
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 5.26 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
HEATING ELEMENT
1. Shut off power at main breaker.
2. Remove rear motor cover.
3. Disconnect heater element wire and mark for reassembly.
4. Remove oven back assembly.
NOTE: For ovens SN 4768 and above, remove fan shroud.
5. Remove two (2) mounting screws and remove heating element.
6. Reassemble in reverse order.
NOTE: Be sure the lead terminals are double nutted to the heating element and are tight
If the leads are not attached in this manner, a loose connection may result, causing
arcing and lead wire burn off.