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The following chart lists the thermocouple millivolt readings from 200°F to 600°F.
200°F 250°F 300°F 325°F 350°F 400°F 425°F 450°F 500°F 550°F 600°F
90°F
3.26
J
88°F
3.32
U
N
86°F
3.37
84°F
3.43
C
82°F
3.49
T
I
80°F
3.55
78°F
3.60
O
76°F
3.66
N
75°F
3.69
74°F
3.72
72°F
3.78
T
70°F
3.83
68°F
3.89
E
66°F
3.95
M
P
64°F
4.01
62°F
4.06
60°F
4.12
300°F
325°F
182
138
OHMS
THERMISTOR, 10K OHM - REPLACEMENT
A. Remove conveyor.
B. Remove bottom fingers.
C. Remove appropriate control box covers - Front & Rear.
D. Remove thermistor probe from wire form in oven chamber and remove from chamber.
NOTE: R. H. Thermistor (viewed from front) is connected directly to the Time/Temp. Display
(Bottom, #9 & #10). When changing L. H. Thermistor (viewed from front), the back motor cover must
also be removed to gain access to the thermistor connector plug.
E. Reassemble in reverse order, making sure bulb is placed securely in the wire form in the oven
chamber.
F. Check system operation, recalibrate as needed.
INFORMATION:
With the oven set at 500°F and your pyrometer reading the same, check the thermistor
as follows:
A. Disconnect the two yellow thermistor leads, position #9 and #10, from the terminal strip on the back
side of the time/temp. display. NOTE: When the thermistor is disconnected, the display should show
"LLL".
B. Take an ohm reading across the thermistor leads. At a setting of 500°F, the reading should be 24 to
25 ohms. When checking the reading at 550°F, the reading should be 16 ohms. If the readings can
not be attained, replace the thermistor. If the readings are present, then replace the time/temp.
display.
HALL EFFECT SENSOR - REPLACEMENT
NOTE: There are two (2) styles of hall effect sensors - (See drawing below).
A. Remove conveyor.
B. Remove control box cover - Front & Rear
C. Remove three (3) wire connector from conveyor control board.Old Style
D. Remove two (2) screws from conveyor drive motor and break away hall effect sensor from around
motor shaft.
E. To install new sensor, cut sensor bracket through center hole and install sensor half with one (1)
screw.New Style
Low Profile -–1600 Series Service Manual – Dom & Int'l
O
V
E
4.77
6.30
7.06
7.83
4.83
6.36
7.12
7.89
4.88
6.41
7.17
7.94
4.94
6.47
7.23
8.00
5.00
6.53
7.29
8.06
5.06
6.59
7.35
8.12
5.11
6.64
7.40
8.17
5.17
6.70
7.46
8.23
5.20
6.73
7.49
5.26
5.23
6.76
7.52
8.29
5.29
6.82
7.58
8.35
5.34
6.87
7.63
8.40
5.40
6.93
7.69
8.46
5.46
6.99
7.75
8.52
5.52
7.05
7.81
8.58
5.57
7.10
7.86
8.63
5.63
7.16
7.92
8.69
OVEN TEMPERATURE
350°F
400°F
102
62
N
T
E
9.37
10.14
10.91
9.43
10.20
10.97
9.49
10.26
11.03
9.54
10.31
11.09
9.60
10.37
11.14
9.66
10.43
11.20
9.72
10.49
11.26
9.77
10.55
11.32
9.80
10.57
11.35
9.83
10.60
11.37
9.89
10.66
11.43
9.95
10.72
11.49
10.00
10.78
11.55
10.06
10.83
11.61
10.12
10.89
11.66
10.18
10.95
11.72
10.24
11.01
11.78
425°F
450°
48
38
M
P
12.46
14.00
15.53
12.51
14.05
15.59
12.57
14.11
15.65
12.63
14.19
15.71
12.69
14.23
15.76
12.74
14.28
15.82
12.80
14.34
15.86
12.86
14.40
15.94
12.89
14.43
15.97
12.92
14.46
15.99
12.97
14.51
16.05
13.03
14.57
16.11
13.09
14.63
16.17
13.15
14.69
16.23
13.20
14.74
16.28
13.26
14.80
16.34
13.32
14.86
16.40
500°F
550°F
24
16
43
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