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CAP
VISUAL INSPECTION
Flames can be observed through the sight glass
reflection below the blower motor.
flame indicates normal operation. At least every three
months a visual inspection should be made.
ELECTRICAL
Be sure that electrical service to the heater has prop-
er overload fuse or circuit breaker protection, wire size
and connections which comply with all applicable
codes.
CAUTION: Prior to replacing any component,
make sure that the main gas, power, and pumps
are turned OFF.
ORIFICE REMOVAL
GAS ORIFICE
1. Locate and close the external manual shut-off
valve.
2. Loosen the external gas union.
3. Locate and remove front door panel.
4. Locate and remove the (4) bolts & nuts holding the
gas orifice in place. See the figure above.
5. Carefully remove the gas orifice and do not mis-
place the o-rings attached to the flanges.
6. Inspect and/or replace the orifice with the correct
size.
GAS AND AIR ORIFICE SELECTION
The gas orifice and the air orifice MUST match to
attain the correct air/fuel ratio.
matched when the number of pockets on the side of
the gas orifice is the same as the number of notches
on the edge of the air orifice.
ADJUSTMENT SCREW
CLOCKWISE TO INCREASE
MANIFOLD
PRESSURE TAP
-0.40" ± 0.10" W.C.
GAS VALVE
A blue colored
BRACKET
O-RING
The orifices are
The gas orifice is located on the gas train, between the
gas valve and the combustion blower. The air orifice
is located on the inlet side of the combustion blower.
NOTE: Orifices for propane gas have a black oxide
finish.
MUST MATCH
FOR CORRECT
AIR/FUEL RATIO
4 POCKETS
GAS ORIFICE
Pockets / Notches
1
2
3
4
5
6
IGNITER REMOVAL
.26" MIN ALONG
LENGTH OF RODS
1. Locate and remove front door panel.
2. Locate and remove the accessible left side access
panel. You may also reach from the front of the
heater or remove the jacket top for better access.
3. Locate the igniter behind the blower.
4. Locate and disconnect the high tension spark
cable from the igniter.
5. Using a 5/16" socket, remove the (2) bolts holding
the igniter down.
6. Using a flat screw driver, loosen the igniter brack-
et from the combustion chamber, preferably on
both sides.
7. Carefully remove the igniter from its location. The
ceramic is fragile, so handle with care.
8. When replacing or inspecting the igniter, the gap
between the ground & spark tips should be 0.18"±
0.03". The gap between the rods should be no
less than 0.26" along their entire length.
41
4 NOTCHES
Model
Elevation
AIR ORIFICE
409
0-2000 ft
259
0-2000 ft
409
2000-5000 ft
259
2000-5000 ft
409
5000-7000 ft
259
5000-7000 ft
.18" ± .03"
Igniter
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