For Dearborn Model DRC Vent-Free Heaters
Your heater has been factory tested and adjusted.
Due to variations in heating values and gas pressures, it may be
necessary to make an adjustment to the burner air shutter setting.
Figure 1 shows the correct flame characteristics and required
adjustments. A small hard blue flame or a flame blowing off the
burner ports or lighting back at the burner orifice indicates too
much primary air and the air shutter should be closed. A soft,
blurred or yellow tipped flame indicates lack of primary air and the
air shutter should be opened.
- Light the burner.
- After the burner
has been in operation for 3 minutes or more, observe the burner
flame, Figure 1, and make the air shutter adjustment, if needed.
- Visually check the
burner flame periodically. See Figure 1. Any change in the burner
flame from that obtained in Step 2 above may indicate a dirty burner
or burner compartment. Turn the gas off at the line cut-off valve,
open the burner access door and allow the heater to completely cool.
Clean the burner area with a vacuum cleaner attachment.
- Once each year, the
burner may need cleaning. This can be done with a vacuum cleaner
attachment or bottle brush. Clean burner area, burner air intake,
air shutter and burner ports with a brush or blow them out with a
vacuum cleaner or tire pump. See Figure 1.
- We strongly
recommend having a qualified service agency inspect the unit for
proper operation before the start of each heating season.
- The orifice
supplied for the burner has been drilled to specified gas
characteristics to provide proper operation and the required gas
input at the manifold pressure shown on the name plate.