38
To remove filters from an external filter rack in an upright
upflow installation, follow the directions provided with
external filter rack kit.
Horizontal Unit Filter Removal
Filters in horizontal installations are located in the central
return register or the ductwork near the furnace.
To remove:
1. Turn OFF electrical power to furnace.
2. Remove filter(s) from the central return register or
ductwork.
3. Replace filter(s) by reversing the procedure for
removal.
4. Turn ON electrical power to furnace.
Media Air Filter or Electronic Air Cleaner
Removal
Follow the manufacturer’s directions for service.
Burners
Visually inspect the burner flames periodically during the
heating season. Turn on the furnace at the thermostat and
allow several minutes for flames to stabilize, since any
dislodged dust will alter the flames normal appearance.
Flames should be stable, quiet, soft, and blue (dust may
cause orange tips but they must not be yellow). They should
extend directly outward from the burners without curling,
floating, or lifting off. Flames must not impinge on the sides
of the heat exchanger firing tubes.
Burner Flame
Figure 43
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
accumulation 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-
supplied 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 indicated in the Specifications Sheet.
Flue Passages (Qualified Servicer Only)
The heat exchanger flue passageways should be inspected
at the beginning of each heating season.
BEFORE LEAVING AN INSTALLATION
•
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.
REPAIR AND REPLACEMENT PARTS
•
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
Propane Gas Orifice
Blower Cutoff
Igniter
Blower Housing
Flame Sensor
Pressure Switch
Rollout Limit Switch
Door Switch
Primary Limit Switch
Auxiliary Limit Switch
Coil Front Cover
Integrated Control Module
Transformer
Door Switch
Induced Draft Blower
Heat Exchanger with Recuperator Coil
