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10-Combustion Air Inducer
ensure proper operation. The combustion air inducer is
used to draw fresh air into the combustion chamber while
simultaneously expelling exhaust gases. The inducer op-
erates throughout the heating cycle.
exhaust gases from the burners. When the combustion
air prove switch is closing proving that the combustion air
inducer is operating before allowing the ignition control to
energize.
When the combustion air prove switch is closed and the
B-Cooling System Service Checks
LGT units are factory charged and require no further ad-
-
VI-MAINTENANCE
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
A-Filters
more frequently in severe use) and cleaned or replaced
-
NOTE-Filters must be U.L.C. certied or equivalent for
use in Canada.
B-Lubrication
All motors and blower wheels used in LGT units are prelu-
C-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
access panel or to clean blower wheel.
D-Evaporator Coil
Inspect and clean coil at beginning of each season. Clean
using mild detergent or commercial coil cleanser. Check
and condensate drain with water taking care not to get in-
lines and coil for evidence of oil and refrigerant leaks.
E-Condenser Coil
Formed Coils -
Clean condenser coil annually with water and inspect
monthly during the cooling season. Clean the all-alumi-
num coil by spraying the coil steadily and uniformly from
must be at least 12 inches from the coil face. Take care
tubes. Reduce pressure and work cautiously to prevent
damage.
Slab Coils -
Clean condenser coil annually with detergent or commer-
cial coil cleaner and inspect monthly during the cooling
season. Check connecting lines and coil for evidence of
oil and refrigerant leaks.
NOTE-If owner complains of insucient cooling, the unit
should be gauged and refrigerant charge checked. Refer
to Gauge Manifold Attachment and Charging sections in
this manual.
F-Electrical
1 - Check all wiring for loose connections.
2 - Check for correct voltage at unit (unit operating).
3 - Check amp-draw on both condenser fan motor and
blower motor.
4 - Check crankcase heater temperatures to ensure
they are operating.
Check compressor sump thermistors to ensure they
are making contact with compressor shell (ultra
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