Publication No. 1-07-184
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Troubleshooting modulation motors
Purpose
This document provides a guide for troubleshooting burner modulation motors (Figure 1), which are commonly called mod motors. They are also known as modulation actuators.
Scope
This document applies to Honeywell mod motors M7284C-1000, M9174C-1025, and M9184F-1034 used on Heatec HC and HCS heaters.
What the mod motor does
The mod motor is connected to mechanical linkage that opens and closes fuel valves and air dampers of the burner (Figure 1). It provides proportional control of its firing rate. The shaft of the mod motor operates the linkage as it rotates within an arc of 90 degrees.
Figure 1. Honeywell mod motor M7284C-1000 installed on heater.
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