Lennox LHT/LDT024 Installation Instructions Manual page 38

HEAT EXCHANGER ASSEMBLY
Two-Stage Shown
HEAT
EXCHANGER
TUBE
COMBUSTION
AIR INDUCER
BURNER
PRIMARY
ROLLOUT
LIMIT
SWITCH
CONNECTOR
FIGURE 28
E-Flue Box (LDT Units)
Remove flue box cover only when necessary for
equipment repair. Clean inside of flue box cover and heat
exchanger tubes with a wire brush when flue box cover
has to be removed. Install a new flue box cover gasket
and replace cover. Make sure edges around flue box
cover are tightly sealed.
TOP VIEW
SUPPLY
AIR
BLOWER
CONDENSER ACCESS PANEL
FLUE BOX
COVER
GAS VALVE
VENT
CLEAN CONDENSER COIL - UNITS WITH FIN/TUBE COILS
ENDPLATE IS SECURED
TO MULLION
CONDENSER
F-Evaporator Coil
Inspect and clean coil at beginning of each cooling season.
Clean using mild detergent or commercial coil cleaner.
Flush coil and condensate drain with water taking care not
to get insulation, filters and return air ducts wet.
G-Condenser Coil
Clean condenser coil annually with detergent or
commercial coil cleaner and inspect monthly during the
cooling season.
Condenser coils are made of single and two formed slabs.
On units with two slabs, dirt and debris may become
trapped between the slabs. To clean between slabs,
carefully separate coil slabs and wash them thoroughly.
See figure 29. Flush coils with water following cleaning.
Note - Remove all screws and gaskets prior to cleaning
procedure and replace upon completion.
H-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
1- Remove unit top panel and condenser section access
panel.
2- Remove screws securing coil end plate to mullion.
3- Remove wire ties connecting coils slabs and separate
slabs 3-4" (76-102mm).
4- Clean coils with detergent or commercial coil cleaner.
5- Rinse thoroughly with water and reassemble
field-provided wire ties to connect coil slabs.
COILS
FIGURE 29
Page 38
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LHT/LDT024, 036, 048, 060
Use