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507348-04 12/2015
E-Flue Box (Gas 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.
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
All-Aluminum Coils -
Clean condenser coil annually with water and inspect
monthly during the cooling season.
Clean the all-aluminum coil by spraying the coil steadily
and uniformly from top to bottom. Do not exceed 900 psi
or a 45
angle; nozzle must be at least 12 inches from the
coil face. Take care not to fracture the braze between the
fins and refrigerant tubes. Reduce pressure and work
cautiously to prevent damage.
Fin/Tube Coils -
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 31. Flush coils with water following cleaning.
Note - Remove all screws and gaskets prior to cleaning
procedure and replace upon completion.
H-Compressor
If Interlink compressor replacement is necessary, call
1-800-4-LENNOX (1-800-453-6669).
IMPORTANT
Some scroll compressors have an internal vacu
um protector that will unload scrolls when suc
tion pressure goes below 20 psig. A hissing
sound will be heard when the compressor is run
ning unloaded. Protector will reset when low
pressure in system rises above 40 psig. DO NOT
REPLACE COMPRESSOR.
J-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.
TOP VIEW
CONDENSER
COILS
BLOWER
CONDENSER ACCESS PANEL
FIGURE 31
ENDPLATE IS SECURED
TO MULLION
1-
Remove unit top panel and condenser section access
panel.
2-
Remove screws securing coil end plate to mullion.
3-
Remove wire ties connecting coil slabs and separate
slabs 3-4” (76-102mm).
4-
Clean coils with detergent or commercial coil cleaner.
5-
Rinse thoroughly with water and reassemble
.
6-
Secure coil slabs together using field-provided wire
ties.
CLEAN FIN/TUBE CONDENSER COIL - KGA/KCA 036, 048, 060
SUPPLY
AIR
