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100749
SERVICE
PROCEDURES
Continued
Changing Burner Orifice
1. Shut off gas supply to
heater.
2. Remove lower front
access panel on heater.
3. Disconnect burner tube
from orifice holder (see
Figure 20).
4. Remove orifice holder
from burner (see Figure
20).
5. Use socket or open-end
wrench to remove the old
orifice from the orifice
holder.
6. Clean and replace orifice,
or replace with new
orifice.
7. Turn on gas to heater and
check for gas leaks. Apply
a mixture of liquid soap
and water to all joints.
Bubbles forming show a
leak. Correct all leaks at
once.
8. Replace lower front
access panel.
Figure 20 - Orifice Location (35,000 BTU/Hr Burner Shown)
Burner
Tube
Orifice
Holder
Orifice
Burner
Black Blue
Fan Switch
(Off/On/Auto)
Red
Fan
Switch
(N.O.)
Black
Red
White
Green
White
On
110/115 V.A.C.
Blower
Motor
Black
Off
Auto
BLOWER
WIRING
DIAGRAM
(For Models With
Blower Assembly)
Figure 21 - Orifice