- ETL Direct Fired Heater Installation, Operation, and Maintenance Manual

Direct Fired Module Installation

Indoor (INLINE) Installation

Heat Module Add-On Installation

Modular heat units shipped to add heat onto existing blower only applications require field mechanical

and wiring installation.

1. Remove existing filter intake and lifting lugs from blower section intake side.

2. Attach heat module to blower intake using the provided sheet metal screws and bolts. Tighten

screws and bolts securely to compress the

gasket between the heat module and the

blower module.

3. Support and level the end of the heat module

(end opposite the blower) with the provided

equipment legs/rails.

4. Attach the filter hood to the intake side of the

heater module.

5. Drill a hole in the discharge of the blower large

enough to insert the Maxitrol mixing tube and

discharge sensor (if provided). Install the Maxitrol mixing tube in the proper airflow direction. The

airflow direction is labeled on the Maxitrol mixing tube.

6. Wire the sensor as indicated on the supplied wiring schematic. Run all wiring within metal

conduit. Supply 120V AC to terminals 1 and N in the direct fired module.

7. Follow the start up instructions located in this manual.