60
11
Maintenance
Access to the burner will require the following steps:
1. Turn off main electrical power to the appliance.
2. Turn off main manual gas shutoff to the appliance.
3. Remove the front outer control panel cover. Slide out the
inner control panel to increase service clearances and
carefully remove the multi-pin wiring connectors on the
back of the control panel. Remove the screws along the top
edge of the top outer jacket panel to remove top. Remove
the control panel to allow access to the components in the
top of the appliance.
4. Disconnect the wiring connections on the top of the
combustion air blower.
For Models 2500 and 3000 only:
a. Remove the four (4) nuts securing the air/gas venturi to
the air box assembly.
b. Remove the four (4) bolts and nuts from the gas inlet
flange to the side of the air/gas venturi. Carefully handle
the cork gasket and set aside for re-use if not damaged.
c. Remove the four (4) screws securing the blower to the
blower
transition.
d. Carefully remove the combustion blower and air/gas
venturi assembly.
e. Disconnect the flame sensor and spark ignitor wires.
f. On Models 3000 only, remove the sensing tube from the
air pressure switch to the blower transition.
g. Remove the eight (8) nuts securing the blower transition
to the top of the heat exchanger assembly.
h. Remove the blower transition.
Inspect and clean burner
The burner should be removed for inspection and cleaned
on an annual basis. An appliance installed in a dust or dirt
contaminated environment may require cleaning of the burner
on a 3 to 6 month schedule or more often, based on severity of
the contamination. The fan assisted combustion process may
force airborne dust and dirt contaminants, contained in the
combustion air, into the burner. With sustained operation,
non-combustible contaminants may reduce burner port area,
reduce burner input or cause non-warrantable damage to the
burner.
Use extreme care when operating an appliance for temporary
heat during new construction. Airborne contaminants such as
dust, dirt, concrete dust or drywall dust can be drawn into the
burner with the combustion air and block the burner port area.
External combustion air filters are provided with the appliance.
These filters help ensure clean air is used for the combustion
process. Check filters every month and replace when necessary.
The burner of an appliance used for temporary heat without
combustion air filters installed will probably require a thorough
cleaning before the unit is placed into normal service.
Installation & Operation Manual
For Models 3500 and 5000 only:
a. Remove the air box top cover.
b.
Remove the nuts holding the combustion air
blower to the whirlwind.
c. Remove the four (4) screws securing the blower to the
blower
transition.
d. Use care when removing the combustion air blower to
prevent damage to the gaskets.
For the 4000 Model only:
a. Remove the four (4) bolts from the outlet flange of the
gas valve to disconnect the section of the gas train to the
air
box.
b. Remove the screws and locknuts from the air box front
section as shown in FIG. 11-3.
c. Remove the sheetmetal front portion of the air box with
the gas train section by lifting upward.
5. Disconnect the flame sensor and spark ignitor wires.
a. Remove the sensing tube from the air pressure switch to
the blower transition.
b. Remove the eight (8) nuts securing the blower transition
to the heat exchanger assembly top.
c. Remove the blower transition.
6. The burner can now be lifted vertically out of the heat
exchanger
chamber.
7. Use care when removing the burner to prevent damage to
the woven burner port surface or gaskets on removal.
8. Remove any visible dust or dirt blockage from the surface
of the burner with a vacuum. Compressed air may also
be blown across the burner surface to clean the “pores” of
the woven burner port material.
9. Reassemble in reverse order.
DIR #2000537444 00
REMOVE THE FRONT PORTION
OF THE AIR BOX SECTION WITH
THE GAS TRAIN
Figure 11-3_Air Box Assembly_Model 4000 Only
