Repairing Or Replacing Cabinet Insulation; Homeowner Maintenance - Lennox Elite Series Installation Instructions Manual

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 cab-
inet walls), the surrounding ambient air will affect the in-
side 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 13. Repairing Insulation
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.
Electric Shock Hazard.
Can cause injury or death.
Foil-faced
characteristics similar to metal. Be sure there
are no electrical connections within 1/2ʺ
of the insulation. If the foil-faced insulation
comes in contact with electrical voltage, the
foil could provide a path for current to pass
through to the outer metal cabinet. While
the current produced may not be enough to
trip existing electrical safety devices (e.g.,
fuses or circuit breakers), the current can be
enough to cause an electrical shock hazard
that could cause personal injury or death.

Homeowner Maintenance

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.
Professional Maintenance
Failure to follow instructions will cause damage to
the unit.
This unit is equipped with an aluminum coil.
Aluminum coils may be damaged by exposure to
solutions with a pH below 5 or above 9. The alumi-
num coil should be cleaned using potable water
at a moderate pressure (less than 50psi). If the
coil cannot be cleaned using water alone, Lennox
recommends use of a coil cleaner with a pH in the
range of 5 to 9. The coil must be rinsed thoroughly
after cleaning.
In coastal areas, the coil should be cleaned with
potable water several times per year to avoid corro-
sive buildup (salt).
Page 15
WARNING
insulation has
IMPORTANT
NOTICE !
conductive