32
MEDIA AIR FILTER OR ELECTRONIC AIR CLEANER REMOVAL
Follow the manufacturer’s directions for service.
BURNER
The Ultra Low NOx furnace uses a premix burner. The
burner box is sealed to achieve safe and reliable opera-
tion. There is a small viewport available on the burner
box to check for ignition and operation.
Burner Box
Figure 36
INDUCED DRAFT AND CIRCULATOR BLOWERS
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No
further lubrication is required. Check motor windings for ac-
cumulation of dust which may cause overheating. Clean as
necessary.
CONDENSATE TRAP AND DRAIN SYSTEM (QUALIFIED SERVICER
ONLY)
Annually inspect the drain tubes, drain trap, and field-sup-
plied drain line for proper condensate drainage. Check drain
system for hose connection tightness, blockage, and leaks.
Clean or repair as necessary.
FLAME SENSOR (QUALIFIED SERVICER ONLY)
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating acts
as an insulator causing a drop in the flame sense signal. If the
flame sense signal drops too low the furnace will not sense
flame and will lock out. The flame sensor should be carefully
cleaned by a qualified servicer using emery cloth or steel wool.
Following cleaning, the flame sense signal should be as indi-
cated in the Specifications Sheet.
FLUE PASSAGES (QUALIFIED SERVICER ONLY)
The heat exchanger flue passageways should be inspected at
the beginning of each heating season.
B
EFORE
L
EAVING
AN
I
NSTALLATION
• Cycle the furnace with the thermostat at least three
times. Verify cooling and fan only operation.
• Review the Owner’s Manual with the homeowner and
discuss proper furnace operation and maintenance.
• Leave literature packet near furnace.
R
EPAIR
AND
R
EPLACEMENT
P
ARTS
• When ordering any of the listed functional parts, be
sure to provide the furnace model, manufacturing, and
serial numbers with the order.
• Although only functional parts are shown in the parts
list, all sheet metal parts, doors, etc. may be ordered
by description.
• Parts are available from your distributor.
Functional Parts List-
Gas Valve Blower Motor
Gas Manifold Blower Wheel
Natural Gas Orifice Blower Mounting Bracket
Igniter Blower Cutoff
Flame Sensor Blower Housing
Burner Temperature Switch Pressure Switch
Primary Limit Switch Door Switch
Coil Front Cover Auxiliary Limit Switch
Transformer Integrated Control Module
Induced Draft Blower Door Switch
Heat Exchanger with Burner Box
Recuperator Coil Pressure Sensor
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