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507787-01C mrcool.com Page 19 of 22
When the thermostat calls for heating, 24 volts is applied
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
room thermostat. Circuit R-W1 energizes a heat sequencer.
thermostat. They may also be connected to a second
heating stage W2 on the thermostat sub-base.
on the thermostat sub-base so that the electric heat control
Homeowner Maintenance
duct by the installer.
•
cause of inadequate heating or cooling performance.
•
•
sized for it.
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REPLACED before the unit is put back into operation.
separated or torn.
Matte- or foil-faced insulation is installed in indoor
conditions (surrounding ambient temperature and humidity)
and the varying conditions inside the unit. If the insulation
inside surface temperature of the cabinet.
and outside of the cabinet can cause condensation on the
corrosion and, subsequently, component failure.
Areas of condensation on the cabinet surface are an
indication that the insulation is in need of repair.
condition, the insulation should be cut in an X pattern,
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
1. CUT INSULATION IN X PATTERN
2. APPLY GLUE
3. PRESS GLUED TABS AGAINST CABINET
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.
Figure 19.
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