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Adjusting Air/Gas Mixture
Non-CE Units and CE Units Built After April 1999
On the side of the blower housing opposite the motor is a plate with one or two locking nuts. Loosen
the nut(s) enough to allow the plate to be moved, then adjust the position of the plate to open or close
the air intake opening until a bright orange-red glow is obtained. Carefully hold the plate in position
and tighten the locking nut(s).
TYPICAL NON-CE BLOWER ASSEMBLY TYPICAL CE BLOWER ASSEMBLY
ON UNITS BUILT AFTER APRIL 1999
Adjusting Air/Gas Mixture
CE Units Built Through April 1999
CE units built through April 1999 are equipped with a shield assembly in front of the blowers. An
air shutter plate on the face of the shield assembly regulates the amount of airflow to the blower in-
take. To adjust the shutter plate, loosen the locking screws and slide the shutter to the left or right as
necessary to obtain a bright orange-red glow. Carefully hold the shutter plate in position and tighten
the locking screws.
TYPICAL CE BLOWER SHIELD ASSEMBLY
ON UNITS BUILT THROUGH APRIL 1999