Installation and Service Manual

ManualsBrandsModine ManualsCooling & Air QualityHot Dawg HD 60,000 BTU Natural Gas Garage Heater - Stainless Steel Heat Exchanger

6-584.13

Figure 18.2 - Unit Heater Rear View

CONTROL OPERATING SEQUENCE / UNIT COMPONENTS

Upon a call for heat from the thermostat, power is supplied to

the power exhauster motor. The unit will go through a purge

period and then the direct spark igniter will be energized. At the

same time, the main valve in the combination control valve will

open to allow gas to flow to the burners. If the fan motor has not

already started it will start shortly. If a flame is not sensed for

any reason the main valve will close and there will be a short

purge period before ignition is tried again. If the flame is not

sensed after 4 tries there will be at least a one hour wait before

ignition is tried again.

CONTROL OPERATING SEQUENCE

Figure 18.1 - Major Gas, Electrical Service, Safety and Other Components

1. Power Exhauster

2. Pressure Switch

3. Integrated Direct Spark Control Board

4. Combination Gas Control

5. Control Transformer

6. Flame Sensor (hidden)

7. Flame Rollout Switch

8. Auto Reset Limit Control (hidden)

9. Direct Spark Igniter (hidden)

10. Manual Reset Control (hidden,

propeller 100-125 only)

Vent Pipe Connection

Gas Pipe

Access Panel with

Lighting / Operating

Instructions

Electrical Access

Holes

Fingerproof Fanguard

Fan Motor

Mounting Brackets

Table 18.1 - Control Options

Control Description

Control Service Thermostat Type of Model

Code No. Voltage Voltage Gas Size

Single-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry 11 115V 24V natural 30-125

- Utilizes a single-stage combination gas control with ignition control.

Gas is lit with a direct spark igniter on call for heat. 21 115V 24V propane 30-125

Two-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry 12 115V 24V natural 75-125

- Utilizes a two-stage combination gas control with built-in ignition control.

Firing rate is 100% and 50% of full rated input. Gas is lit with a direct spark

22 115V 24V propane 75-125

igniter on call for heat.

Combustion Air Inlet

Pipe Connection

Flame

Sight Glass