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Homeowner Maintenance
IMPORTANT
Do not operate system without a filter. A filter is required
to protect the coil, blower, and internal parts from
excessive dirt and dust. The filter is placed in the return
duct by the installer.
• Inspect air filters at least once a month and replace or
clean as required. Dirty filters are the most common
cause of inadequate heating or cooling performance.
• Replace disposable filters. Cleanable filters can be
cleaned by soaking in mild detergent and rinsing with
cold water.
• Install new/clean filters with the arrows on the side point-
ing in the direction of air flow. Do not replace a clean-
able (high velocity) filter with a disposable (low velocity)
filter unless return air system is properly sized for it.
• If water should start coming from the secondary drain
line, a problem exists which should be investigated and
corrected. Contact a qualified service technician.
Repairing or Replacing Cabinet Insulation
IMPORTANT
DAMAGED INSULATION MUST BE REPAIRED OR
REPLACED before the unit is put back into operation.
Insulation loses its insulating value when wet, damaged,
separated or torn.
Matte- or foil-faced insulation is installed in indoor equip-
ment to provide a barrier between outside air conditions
(surrounding ambient temperature and humidity) and the
varying conditions inside the unit. If the insulation barrier
is damaged (wet, ripped, torn or separated from the cabi-
net walls), the surrounding ambient air will affect the inside
surface temperature of the cabinet.
The temperature/humidity difference between the inside
and outside of the cabinet can cause condensation on the
inside or outside of the cabinet which leads to sheet metal
corrosion and, subsequently, component failure.
REPAIRING DAMAGED INSULATION
Areas of condensation on the cabinet surface are an indi-
cation that the insulation is in need of repair.
If the insulation in need of repair is otherwise in good con-
dition, the insulation should be cut in an X pattern, peeled
open, glued with an appropriate all-purpose glue and
placed back against the cabinet surface, being careful to
not overly compress the insulation so the insulation can
retain its original thickness. If such repair is not possible,
replace the insulation. If using foil-faced insulation, any
cut, tear, or separations in the insulation surface must be
taped with a similar foil-faced tape.
1. CUT INSULATION IN X PATTERN
2. APPLY GLUE
3. PRESS GLUED TABS AGAINST CABINET
FIGURE 21. Repairing Insulation
Use of Air Handler During Construction
Lennox does not recommend the use of its air handler unit
during any phase of construction. Very low return air tem-
peratures, harmful vapors and operation of the unit with
clogged or misplaced filters will damage the unit.
Air handler units may be used for heating (heat pumps)
or cooling of buildings under construction, if the following
conditions are met:
• A room thermostat must control the air handler. The use
of fixed jumpers is not allowed.
• Air filter must be installed in the system and must be
maintained during construction.
• Air filter must be replaced upon construction comple-
tion.
• The air handler evaporator coil, supply fan assembly
and duct system must be thoroughly cleaned following
final construction clean-up.
• All air handler operating conditions must be verified ac-
cording to these installation instructions.
Page 18
GLUE - Make sure there is
full coverage of glue on the
metal or insulation so there
are no areas where air
pockets may form which
can lead to sweating.
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