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Verify Electric Heater Resistance Values
Approximate electric resistance values can be
checked from the main control board.
208/230 VAC
• Large Bank: J307 (
navy
) to K305 relay
(
brown
): 19.0 ohms + or - 5%.
• Medium Bank: J308 (
brown
) to K305 relay
(
brown
): 30.0 ohms + or - 5%.
• Small Bank: J310 (
yellow
) to K305 relay
(
brown
): 46.5.0 ohms + or - 5%.
265 VAC
• Large Bank: J307 (
navy
) to K305 relay
(
Orange
): 25.2 ohms + or - 5%.
• Medium Bank: J308 (
brown
) to K305 relay
(
orange
): 39.9 ohms + or - 5%.
• Small Bank: J310 (
yellow
) to K305 relay
(
orange
): 61.8 ohms + or - 5%.
Verify TCO's
Verify TCO's are closed by checking continuity
across TCO terminals at the heater assembly.
• Self Resettable TCO trip temperature point is
170
°
F and the reset temperature is 140
°
F.
• One Shot TCO trip temperature point is 270
°
F
and will not reset once tripped.
Electric Heater Removal
1. Remove main control board cover and
junction box cover. All screws are 5/16-in.
screws.
Resettable
TCO
One Shot
TCO
Main Control
Board Cover
Junction Box
Cover
2. Remove top cover panel and left and right-
side panels.
Top Cover Panel
Right Side
Panel
Left Side
Panel
(
Continued next page
)
