Sterling Indoor Duct Furnace QVSD-100

Ensure no combustible material is within minimum clearance requirements as per Table 3.

Turn off the manual gas valve and electrical power to the duct furnace.

Open the bottom panel and compress the spring to remove the main burners.

Wire brush the inside surfaces of the heat exchanger.

Clean the burners using a wire brush and/or compressed air.

Are all parts unobstructed after cleaning?

Inspect and clean the pilot burner if necessary.

Open all disconnect switches and secure in that position before servicing unit

Check gas tightness of the safety shut-off valves

Turn off the manual valve upstream of the appliance combination control

Remove the 1/8 inch pipe plug on the inlet side of the combination control

Connect a manometer and note the pressure reading

Turn the manual valve on to apply pressure to the combination control

Is there a loss of pressure indicating a leak?