Sunfire SF-150, Operating Manual

3-6

User's Manual:  Radiant Heater

Annual Maintenance and Service Procedures

NOTE:

 Maintaining and Cleaning your heater at the end of each heating season is important to prolong 

the life of your radiant heater and keep it operating in peak condition.

Replace filter element after 200 hours (approximately 12 tanks of fuel).

Clean the blower wheel

The blower wheel accumulates dust and debris from normal operation. You will need to clean the wheel 

blades periodically to prevent reduction in airflow.

1. 

Inspect the blower wheel by removing the blower wheel access cover.

a. 

To remove the cover, open the ignitor plate and loosen the blower wheel access cover screw 

about three turns.

b. 

Inspect the blower wheel to see if it needs to be cleaned.  Dirt and lint on the wheel reduce air 

flow, and must be removed if the burner is to operate correctly.

2. 

To clean blades, remove the two bolts securing the motor to blower housing.

a. 

Slide the motor out and rotate to remove and access blower wheel.

b. 

Use a brush and vacuum to clean each blade and the blower housing interior.

3. 

Replace motor/wheel in blower housing and secure with the two bolts.

4. 

Push wire slack back into junction box.

Replacing blower motor or wheel
1. 

If either the blower wheel or motor must be replaced, remove the two bolts securing the motor to 

housing.

2. 

Disconnect the motor wires in the burner junction box.

3. 

Loosen the Allen screw securing the blower to the motor shaft and remove the wheel.

4. 

When assembling the replacement assembly, slide the wheel onto the motor shaft and use feeler 

gauges to set a space of 3/64 inch between the blower wheel and the motor face.

5. 

Replace the motor/wheel assembly in the housing, wire the motor leads and secure the motor with 

the two bolts.

WARNING:

 Turn off power to appliance when servicing burner. Failure to comply could result 

in severe personal injury, death or substantial property damage.