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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.
BLOWER
WIRING
DIAGRAM
(For Models With
Blower Assembly)
30
Figure 20 - Orifice Location (35,000 BTU/Hr Burner Shown)
Fan Switch
(Off/On/Auto)
Off
On
Black
Blue
110/115 V.A.C.
Black
White
Green
Burner
Orifice
Orifice
Holder
Figure 21 - Orifice
Auto
Fan
Red
Switch
(N.O.)
Black
Red
White
Burner
Tube
Blower
Motor
100749
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