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H-Pilot Tube, Ignition Wire and Flame Rod
The pilot tube from the gas valve and the flame sensor and
ignition wires from the ignition control enter through the top
of the burner box to the pilot burner assembly.
Figure 10 shows the clearance between top of pilot burner
head and the top of the main burner surface.
FLAME SENSOR
WIRE
IGNITION WIRE
PILOT ASSEMBLY LOCATION
5/16"
PILOT
HOOD
FIGURE 10
BURNER
SURFACE
II-BURNER BOX ASSEMBLY
A-Burner Box / Damper Door
A damper motor is located on the right side of the burner box.
On the left side of the burner box, behind a protective plate is
the damper prove switch. Refer to figure 12. The top of the
burner box top is removable for service.
When there is a call for heat, the damper motor is enerĆ
gized and damper door opens as the damper motor axle
begins to rotate.
B-Damper Prove Switch (S64)
A spring, which is held by a notch in the burner box frame,
activates the damper prove switch as the damper door
opens. See figure 11. The damper door axle rotates the
damper door to open position. As the axle turns, the spring
winds backwards to make contact with the damper prove
switch. The protective cover plate is removable (two screws)
and the spring may be unclipped for service to the damper
door or burner box. The spring must be removed in order to
remove the damper door.
After service is complete, the spring must rest snugly in
notch for damper prove switch to function properly. Do not
force door open, damage to the spring and motor may ocĆ
cur. Take care to open damper door slowly.
DAMPER
PROVE
SWITCH
SPRING
SPRING FITS
SNUGLY IN NOTCH
FIGURE 11
AXLE
DAMPER
DOOR
DAMPER PROVE SWITCH ASSEMBLY
MANIFOLD
Axle rotates and
opens the door, slot in
left end of axle pulls
spring back to activate
damper prove switch.
III-PLACEMENT AND INSTALLATION
Make sure unit is installed in accordance with installation
instructions and applicable does.
IV-STARTĆUP
A-Preliminary and Seasonal Checks
1- Inspect electrical wiring, both field and factory
installed for loose connections. Tighten as required.
2- Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
B-Heating StartĆUp
1- Set thermostat to OFF position. Close manual knob on
gas valve.
2- Wait 5 minutes.
3- Open manual knob on gas valve, replace burner acĆ
cess door and turn on unit electrical supply.
FIGURE 12
DAMPER
MOTOR/
GEAR
PATCH PLATE
PATCH
PLATE
SPRING
DAMPER
SWITCH
DAMPER SWITCH
COVER
OBSERVATION PORT
COVER
ROLL-OUT
SWITCH
DAMPER
BURNER
BOX
DAMPER BOX PARTS ARRANGEMENT
REMOVABLE
BURNER BOX TOP
