Supply Air Blower; Electrical; Intake And Exhaust Lines; Insulation - Lennox G26 series User Manual

11− While supporting pilot, ignitor and sensor wires (−1,−2
units) or ignitor and sensor lines (−3 units) at the grom-
met, grasp burners and simultaneously pull burners
and grommet out of the burner box.
12− Remove ignitor and sensor or pilot bracket assem-
blies from burners using a 1/4" nut driver to remove
two screws from each bracket.
13− Clean burner by running a vacuum with a soft brush at-
tachment over face of burners. Visually inspect inside of
burners and crossovers for any blockage caused by for-
eign matter. Remove any blockage.
14− Re-install ignitor and sensor bracket assemblies on
burners.
NOTE − Ignitor or pilot must be installed on the opposite
side of the burner from the metal button protrusions.
Screws which attached the ignitor bracket must be
installed from the same side as the ignitor and through
the bracket to engage in the smaller holes located in the
burner. The correct burner orientation is with metal but-
ton protrusions always pointing up.
15− Replace burner ignitor assembly back into burner box
so that grommet groove fits back into sheet metal
notch and makes a good seal. The burners sit on top
of the burner box flanges. Make certain that the
screws from underneath the box pass through the
larger holes in the flange and engage in the smaller
holes in the burner. Re-install the two screws.
16− Re-install the gas manifold/gas valve assembly by first
inserting the right hand side of the gas manifold into the
burner box. Swing left side of manifold into box while
engaging support bracket to vestibule panel screws.
Check that foam gaskets are providing a seal around
each end of the gas manifold. All gas orifices should be
engaged. If at this point the burners were mounted in
the wrong holes, this needs to be corrected. The saddle
brackets on the gas manifold should be flush with the
front surfaces on the burner box sides.
17− Inspect the dual layered metal pieces at the front lip of
the cover. These pieces must sandwich around the
metal. Re-install burner box cover.
18− Re-install the screws to secure the burner box cover.
Make sure screws are tight to ensure a leak tight burn-
er box. Tighten the two screws underneath the box.
Again, inspect the grommet to ensure a tight seal.
19− Tighten the two screws holding the manifold bracket
to the vestibule panel.
20− Re-install the electrical connections to the gas valve.
Orange wire to M1 and yellow wire to C2.
21− On −1 and −2 units re−install the spark wire (larger of
the two) to the barbed connector at the ignition con-
trol. Re−install the sensor wire to the spade connector
on the ignition control. On −3 units re-install the 2-pin
ignitor plug at the burner box. Re-install sensor line to
ignition control spade connector.
22− Reconnect gas line to gas valve. On −1 and −2 units
reconnect pilot line to gas valve.
23− Replace lower access panel.
24− Following lighting instructions and gas line connec-
tion test procedures from installation manual.
25− Replace upper access panel.
C−Supply Air Blower
1 − Check and clean blower housing and blower wheel.
2 − Motors are prelubricated for extended life; no further
lubrication is required.
D−Electrical
1 − Check all wiring for loose connections.
2 − Check circuit breaker located in unit control box.
3 − Check for correct voltage at unit (unit operating).
4 − Check amp-draw on blower motor.
Motor Nameplate_________Actual_________
5 − Check to see that heat (if applicable) is operating.
E−Intake and Exhaust Lines
Check intake and exhaust lines and all connections for
tightness and make sure there is no blockage. Also check
condensate line for free flow during operation.
F−Insulation
Outdoor piping insulation should be inspected yearly for dete-
rioration. If necessary, replace with same materials.
G−Winterizing and Condensate Trap Care
1 − Turn off power to unit.
2 − Have a shallow pan ready to empty condensate water.
Avoid spilling water into the control box.
3 − Remove clamp from flue assembly and remove boot or
cap. Empty water from cap. Visually inspect bottom of
flue assembly. Replace boot and clamp.
4 − Remove boot from condensate trap and empty water.
Inspect trap then replace boot.
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