Maintenance; Cabinet Insulation - Lennox BCE3M*C SERIES Installation Instructions Manual

Heating (Heat Pump)
When the thermostat calls for heating, 24 volts is applied to
the blower time-delay relay coil. The normally open contacts
close, causing the indoor blower motor to operate. The
circuit between R and Y is completed, closing the circuit to
the contactor in the outdoor unit, starting the compressor
and outdoor fan motor.
If the room temperature continues to decrease, the circuit
between R and W1 is completed by the second-stage heat
room thermostat. Circuit R-W1 energizes a heat sequencer.
The completed circuit will energize supplemental electric
heat (if applicable). Units with a second heat sequencer
can be connected with the first sequencer to W1 on the
thermostat. They may also be connected to a second
heating stage W2 on the thermostat sub-base.
Emergency Heat (Heating Heat Pump)
If the selector switch on the thermostat is set to the
emergency heat position, the heat pump will be locked out
of the heating circuit, and all heating will be electric heat (if
applicable). A jumper should be placed between W2 and E
on the thermostat sub-base so that the electric heat control
will transfer to the first-stage heat on the thermostat. This
will allow the indoor blower to cycle on and off with the
electric heat when the fan switch is in the AUTO position.

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
pointing in the direction of air flow. Do not replace a
cleanable (high velocity) filter with a disposable (low
velocity) filter unless return air system is properly
sized for it.
• If water is seen dripping from the secondary drain line,
contact a qualified service technician. This is a sign
of a problem that must be investigated and corrected.
Page 20 of 23

Cabinet Insulation

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 equipment
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 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 22. Repairing Insulation
Issue 1720
IMPORTANT
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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