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High Altitude Information
Refer to table 17 for manifold pressure settings for instalĆ
lations at altitudes from 0 to 7500 feet (0 to 2286 m).
NOTE - In Canada, certification for installations at elevaĆ
tions over 4500 feet (1372 m) is the jurisdiction of local auĆ
thorities.
The pressure switch(es) are factory-set and should not
be adjusted. The -75 is equipped with both a high- and
low-heat pressure switch. The -100 and -125 units have a
single pressure switch.
Other Unit Adjustments
NOTE - Disconnect power to unit before making any
adjustments.
Heat Anticipation Settings
Thermostat anticipator setting (if adjustable) should be
set according to amps listed on wiring diagram on unit.
Flame Rollout Switch
Factory set: No adjustment necessary.
Limit Control
Factory set: No adjustment necessary.
Pressure Switches
Factory set: No adjustment is necessary.
Temperature Rise
Check temperature rise and, if necessary, adjust blower
speed to maintain temperature rise within range shown
on unit rating plate.
Electrical
1 - Check all wiring for loose connections.
2 - Check circuit breaker located on unit control box.
3 - Check for the correct voltage at the furnace (furnace
operating).
4 - Check amp-draw on the blower motor.
Motor Nameplate __________Actual__________.
NOTE - Do not secure electrical conduit directly to ductĆ
ing or structure.
Electronic Ignition
The SureLight integrated control has an internal watchĆ
guard feature. The feature serves as an automatic reset
device for ignition controls locked out because the burner
has failed to light. After one hour of continuous thermostat
demand for heat, the watchguard will break and remake
thermostat demand to the furnace and automatically reĆ
set the control to relight the furnace.
Burner Flame
Start burner and allow to operate for a few minutes to esĆ
tablish normal burning conditions. Check burner flame by
observation. Flame should be predominantly blue and
strong in appearance.
Check burner flame periodically to ensure proper opera-
tion.
Service
WARNING
Disconnect power before servicing unit.
CAUTION
Label all wires prior to disconnection when servicĆ
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
Annual Service
At the beginning of each heating season, system should
be checked as follows by a qualified service technician:
Electrical
1 - Check all wiring for loose connections.
2 - Check circuit breaker located on unit control box.
3 - Check for the correct voltage at the furnace (furnace
operating).
4 - Check amp-draw on the blower motor.
Motor Nameplate_________Actual_________
5 - Check to see that heat (if applicable) is operating.
Blower
Check the blower wheels for debris and clean if necesĆ
sary. The blower motors are prelubricated for extended
bearing life. No further lubrication is needed.
Filters
1 - Filters must be cleaned or replaced when dirty to as-
sure proper furnace operation.
2 - Reusable foam filters used with the unit can be
washed with water and mild detergent.
3 - If replacement is necessary, order Lennox part no.
31J81 for 14 inches x 25 inches (356 x 635 mm) filĆ
ter for G32V-75 units and P-8-7831 for 20 inches x
25 inches (508 x 635 mm) filter for G32V-100 and
-125 units.
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.
Insulation
Outdoor piping insulation should be inspected yearly for
deterioration. If necessary, replace with same materials.
Winterizing and Condensate Trap Care
1 - Turn off power to unit.
2 - Have a shallow pan ready to empty condensate waĆ
ter. Avoid spilling water into the control box.
3 - Remove clamp from flue assembly and remove boot
or cap. Empty water from cap. Visually inspect botĆ
tom of flue assembly. Replace boot and clamp.
4 - Remove boot from condensate trap and empty waĆ
ter. Inspect trap then replace boot.
