Page 7
Flue Passageway and Flue Box
1− Remove the combustion air inducer assembly as
described in the Combustion Air Inducer subsection.
2− Remove flue box cover. Clean with a wire brush as
required.
3− Clean tubes with a wire brush. On 036 and 060 units,
remove flue baffle retaining bracket and pull baffles
from heat exchanger tubes. Clean tubes and baffles.
4− Reinsert baffles, when present, and secure baffle
retaining bracket. Reassemble the unit. The flue box
cover gasket and combustion air inducer gasket
should also be replaced during reassembly.
Evaporator Coil
Inspect and clean coil at beginning of each cooling
season. Clean using mild detergent or commercial coil
cleanser. Flush coil and condensate drain with water
taking care not to get insulation, filters and return air
ducts wet.
Condenser Coil
Clean condenser coil annually with mild detergent or
commercial coil cleaner and inspect monthly during the
cooling season.
Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before removing access panel
or cleaning blower wheel.
WARNING
Danger of explosion. Can cause injury or
death. Do not overtighten main burner
mounting screws. Snug tighten only.
Service Reminder
Call your Lennox dealer if the unit is inoperative.
Before calling, always check the following to be sure
service is required:
1− Be sure electrical disconnect switches are ON.
2− Check room thermostat for proper setting.
3− Replace any blown fuses or reset circuit breakers.
4− Gas valve should be ON.
5− Air filters should not be plugged, limiting air flow.
6− Make sure all access panels are in place.
Repair Parts Listing
The following repair parts are available through Lennox dealers. When ordering parts, include the complete model
number and serial number listed on the ETL/CSA rating plate − e.g. SGA120H4BH1Y.
Gas Heat Section Parts
Heat Exchanger
Combustion Air Assembly
Combustion Air Proving Switch
Burner Assembly
Burner Manifold Assembly
Main Burner Orifices
Flame Roll−out Switches
Auxiliary Limit Controls
Ignition Electrode Assembly
Ignition Lead
Ignition Sensor Assembly
Sensor Lead
Combination Gas Valve
Limit Controls
Cooling Parts
Compressors
Low Pressure Switch
High Pressure Switch
Condenser Fan Motors
Condenser Fan Blades
Condenser Fan Run Capacitors
Freezestats
Low Ambient Pressure Switch
Low Ambient Thermostat
Condenser Fan Mounting Bracket
Fan Grille
Indoor Blower Motors
Blower Wheel
Expansion Valve
Distributor
Crankcase Heaters
Exhaust Fans (Opt.)
Electrical Control Parts
Main Control Panel
Economizer Control Panel (Opt.)Comp
Control Panel
Compressor 3 and 4 Control Panel
Gas 2 Control Panel
Compressor Contactors
Circuit Breakers
Transformer (Control)
Transformer (Contactor)
Transformer (CAB)
Blower Contactor
Limit, Blower Relay
Heat Relays
Condenser Fan Relays
Capacitor CAB
Relay CAB
Low Ambient Relay
Low Amb. Low Pressure Switches
To Previous Page
Loading...
Need help?
General
