Page 38
LHT/LDT024, 036, 048, 060
HEAT EXCHANGER ASSEMBLY
Two-Stage Shown
FIGURE 28
BURNER
COMBUSTION
AIR INDUCER
VENT
CONNECTOR
GAS VALVE
HEAT
EXCHANGER
TUBE
PRIMARY
LIMIT
ROLLOUT
SWITCH
FLUE BOX
COVER
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.
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.
TOP VIEW
CONDENSER
COILS
BLOWER
CONDENSER ACCESS PANEL
FIGURE 29
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 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
.
Use
field-provided wire ties to connect coil slabs.
CLEAN CONDENSER COIL - UNITS WITH FIN/TUBE COILS
SUPPLY
AIR
