National Comfort Product CPG41238-U Series Installation manual - Inspect and Clean The Burner
Installation Guide for Comfort Pack (CPG) Units
25
Inspect and Clean the Burner
With the burner assembly removed, shine a flashlight on the
burner ribbons. Look for carbon buildup, scale, dust, lint, and/
or anything that might restrict flow through the spaces between
the burner ribbons. Holding the burner assembly so that any
foreign material will fall away from the burner, use a stiff bristle
brush to loosen and remove any foreign material(s). If the burner
is excessively dirty, refer to Figure 6A and remove one of the
burner end caps. Remove the four screws that hold the end cap
to the burner housing. Lightly tap the end cap to remove it.
Clean all foreign material from the burner and venturi. After the
burner is thoroughly clean, replace the end cap making certain
that it is tight against the burner housing.
NOTE: IF ANY OF THE BURNER COMPONENTS
ARE DAMAGED OR DETERIORATED, REPLACE
THE BURNER ASSEMBLY.
Inspect the Lower Portion of the Heat Exchanger (with burner
assembly removed)
At the burner flame entrance of each tube, shine a bright light
into each heat exchanger section. If any light is observed,
replace the heat exchanger.
Instructions for Burner Installation
1. With lower burner brackets going inside the retaining track,
set the fully assembled, clean burner in the unit.
2. Secure the upper burner brackets to the secondary air shield
assembly.
3. Replace the secondary air shield end cap.
4. Attach and reconnect the pressure switch.
5. Reinstall the gas train and gas valve to the burner orifice
bracket and side panel.
6. Turn on the electric and the gas. Operate the furnace. Check
gas supply lines with a liquid leak detector or soap solution.
After it has been determined that there are no gas leaks and
the burner is operating satisfactorily, replace the cabinet panel
and the burner/control compartment panel.
Figure 6B
Secondary Air Shield Assembly
w/ End Cap Removed
Upper Burner Brackets
Burner Assembly
Retaining Track
Lower Burner Bracket
(one on each end) -
Place in the retaining track on the
secondary air shield assembly.
Burner Orifice
Burner orifice only needs to be replaced when a change in
gas is made. When ordering a replacement orifice, give BTUH
content and specific gravity of gas, as well as the model and
serial number of the unit. To prevent dropping the orifice into
the burner housing, block the venturi with something the size of
a credit card when removing the burner orifice. Be careful not to
damage the venturi tube and/or the bracket.
Ignition System
Igniter - Refer to Figure 6A and locate the igniter. Disconnect
the wire; remove the screw and the igniter. Clean the igniter
assembly with an emery cloth. Spark gap must be maintained to
1/8” (See Figure 7) on next page.
Flame Sensor - Refer to Figure 6A and locate the flame sensor.
Disconnect the wire; remove the screw and the flame sensor.
Clean with an emery cloth.