Page 31
508336-01 4/2023
HEAT EXCHANGER ASSEMBLY
FIGURE 25
BURNER
COMBUSTION
AIR INDUCER
VENT
CONNECTOR
GAS VALVE
HEAT
EXCHANGER
TUBE
E-Flue Passageway and Flue Box (Gas Units)
1- Remove combustion air inducer assembly as
described in section D.
2- Remove flue box cover. Clean with a wire brush as
required.
3- Clean tubes with a wire brush.
4- Reassemble the unit. The flue box cover gasket and
combustion air inducer gasket should also be
replaced during reassembly.
F-Indoor Coil
Inspect and clean coil at beginning of each cooling season.
Clean using mild detergent or commercial coil cleaner.
Flush coil and condensate drain with water taking care not
to get insulation, filters and return air ducts wet.
G-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove
access panel or to clean blower wheel.
H-Outdoor Coil
Clean outdoor coil annually with detergent or commercial
coil cleaner and inspect monthly during the cooling
season. Access panels are provided on front and back of
outdoor section.
J-Indoor Air Quality (CO
2
)Sensor
The Unit Controller uses input (CO
2
levels) from the
optional sensor to adjust dampers and maintain specified
amounts of fresh outdoor air. See figure 26.
INDOOR AIR QUALITY (CO
2
) SENSOR
FIGURE 26
SUPPLY AND
RETURN AIR
IAQ SENSORS
STATUS
INDICATOR
K-Needlepoint Bipolar Ionizer
The optional, brush-type ionizer produces positive and
negative ions to clean air and reduce airborne
contaminants. The ionizer was designed to be low
maintenance. The device should be checked
semi-annually to confirm the brushes are clean for
maximum output. The ionizer is located behind the filters.
See figure 27.
1- Remove filters, screws securing the top and bottom
of the upper filter bracket, and the wire ties the screws
hold in place. See figure 27.
2- Disconnect the ionizer plug near the top of the filter
rack.
3- Pull ionizer out of unit and clean brushes.
4- Replace ionizer, reconnect ionizer plug, and replace
filters, screws, and wire ties.
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