Use Of Air Handler During Construction; Repairing Damaged Insulation - Lennox Merit CBX25UHV Installation Instructions Manual

separated from the cabinet 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
indication that the insulation is in need of repair.
If the insulation in need of repair is otherwise in good
condition, 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 24. 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.

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
temperatures, 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
completion.
●
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
according to these installation instructions.
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MERIT CBX25UHV SERIES