Air Shutter - Broaster 1800 Service Manual

Main Burner Flame:
Flame must be blue and sit on the burner
surface. During normal operation, a slight
"whoosing" sound may be heard when
burner shuts off. If you cannot adjust the
flame correctly check the following:
1. Air shutter adjustment. See AIR SHUT-
TER Adjustment.
2. Centered main burner orifice. After
installing a new gas valve or piping,
brackets can shift causing gas not to
travel down center of the venturi. A bad
air/gas mixture is the result.
3. Drafts on floor can affect combustion.
Drafts can be caused by open doors,
fans and ventilation systems. See
VENTILATION.
4. Incorrect ventilation can affect com-
bustion. See VENTILATION.
5. Gas pressure is a main factor for good
operation. Be sure correct water col-
umn is present. See Gas Pressure
Adjustment under FLAME ADJUST-
MENTS.
6. Loose venturi (11) or bad gasket (12)
can affect combustion. Tighten or
replace gasket.
8-5
broaster.com Manuals #17270 10/13 Rev 12/14

AIR SHUTTER

Maintains air/gas mixture for good combus-
tion. Start with a 1/4" gap after installing a
new gas valve or piping.
Adjustment will be necessary if main burner
flame is mostly orange or yellow. If flame is
out of adjustment, check combustion cham-
ber and flue for soot build-up.
If soot is present, DO
NOT operate unit until all
soot is removed and correction made.
Soot is black and powdery to the touch.
See COMBUSTION CHAMBER.
Adjustment:
1. Loosen locknut (13) which locks air
shutter.
2. Screw shutter (14) in or out to obtain a
blue flame. Flame should start burning
slightly above main burner.
3. Tighten locknut.