Vanguard Heating GVB35P - Manual (Page 32)

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SERVICE
PROCEDURES
Continued
Figure 24 - Orifice Location (35,000 BTU/Hr Burner Shown)
Figure 25 - Orifice
Burner
Tube
Orifice
Holder
Orifice
Burner
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 24).
4. Remove orifice holder
from burner (see Figure
24).
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.