Heatec Tec-Notes

Publication No. 1-07-184
download this Tec-Note in PDF format

Pages: 1, 2, 3, 4, 5, 6, 7, 8

Figure 2. Top view of Honeywell mod motor M7284C-1000.
Modulation motor components

Model Differences
The following table identifies the models of mod motors used on Heatec HC and HCS heaters that have modulating burners. There are important differences in the way the switches and cams are configured. Figure 2 shows the motor now used.

Key differences Honeywell mod motors
M7284C-1000 M9174C-1025 M9184F-1034
Heatec heaters used on HC & HCS
12-06 & after
HC & HCS
prior to 12-06
HC & HCS
early units with
modulating burners
Color of low-fire cam
Red
Blue
Red
Wiring of low-fire proof switch
Normally closed
Normally open
(held closed)
Normally closed
Wires used, low-fire proof switch
Red=common
Yellow=Normally closed
Red=common
Yellow=Normally open
Red=common
Yellow=Normally closed
Color of high-fire cam
Blue
Blue
Blue
Wiring of high-fire proof switch
Normally open
Normally open
Normally open
Wires used, high-fire proof switch
Black/red=common
Black/blue=Normally open
Black/red=common
Black/blue=Normally open
Black/red=common
Black/blue=Normally open
Resistor board or resistor harness
(Not used)
Yes
Yes

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Hot Oil Heater
Tec-Notes

Model differences of mod motors

Interaction with controls

Common problems and symptoms

Checking & resetting cams

Mod motor wiring diagram

Configuration of cams & switches

Dip switch settings

Replacing mod motor