Installation Guide
24
ANNUAL INSPECTION
The furnace should be inspected by a qualified installer, or service
agency at least once per year. This check should be performed at
the beginning of the heating season. This will ensure that all
furnace components are in proper working order and that the
heating system functions appropriately. Pay particular attention
to the following items. Repair or service as necessary.
• Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections at
and internal to the furnace.
• Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
• Burners. Check for proper ignition, burner flame, and
flame sense.
• Wiring. Check that electrical connections are tight and
free from corrosion. Check wires for damage.
• Filters.
FILTERS
T
O
AVOID
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
REMOVING
FILTERS
. N
EVER
OPERATE
FURNACE
WITHOUT
A
FILTER
INSTALLED
BECAUSE
DUST
AND
LINT
WILL
BUILD
UP
ON
INTERNAL
PARTS
RESULTING
IN
LOSS
OF
EFFICIENCY
,
EQUIPMENT
DAMAGE
AND
POSSIBLE
FIRE
.
WARNING
A return air filter is not supplied with this furnace; however, there
must be a means of filtering all of the return air. The installer will
supply filter(s) at the time of installation.
FILTER M AINTENANCE
Improper filter maintenance is the most common cause of
inadequate heating or cooling performance. Filters should be
cleaned (permanent) or replaced (disposable) every two months
or as required.
HIGH VOLTAGE!
T
O
PREVENT
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
TO
THE
FURNACE
BEFORE
REMOVING
THE
FILTER
OR
PERFORMING
ANY
OTHER
MAINTENANCE
.
WARNING
FILTER REMOVAL
Depending on the installation, differing filter arrangements can
be applied. Filters can be installed in either the central return
register or a side panel external filter rack (upflow only). A media
air filter or electronic air cleaner can be used as an alternate
filter. Follow the filter sizes given in the Recommended Minimum
Filter size table or instruction provided by the media or electronic
air cleaner manufacturer to ensure proper unit performance.
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter
rack kit.
INDUCED DRAFT AND CIRCULATOR BLOWER MOTORS
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.
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 steel wool. The flame sense signal should
be 1 to 3 microamps.
IGNITER (QUALIFIED SERVICER ONLY)
At room temperature, the igniter ohm reading should be from 37 -
68 ohms.
BURNERS
T
O
PREVENT
PERSONAL
INJURY
OR
DEATH
,
DO
NOT
REMOVE
ANY
INTERNAL
COMPARTMENT
COVERS
OR
ATTEMPT
ANY
ADJUSTMENT
.
E
LECTRICAL
COMPONENTS
ARE
CONTAINED
IN
BOTH
COMPARTMENTS
.
C
ONTACT
A
QUALIFIED
SERVICE
AGENT
AT
ONCE
IF
AN
ABNORMAL
FLAME
APPEARANCE
SHOULD
DEVELOP
.
WARNING
Periodically during the heating season, make a visual check of the
burner flames. Turn the furnace on at the thermostat. Wait a few
minutes, since any dislodged dust will alter the normal flame
appearance. Flames should be stable, quiet, soft and blue with
slightly orange tips. They should not be yellow. They should extend
directly outward from the burner ports without curling downward,
floating or lifting off the ports.
C
LEANING
(Q
UALIFIED
S
ERVICER
O
NLY
)
1. Shut off electric power and gas supply to the furnace.
2. Disconnect the rollout limit wires, flame sensor wire, and
disconnect the igniter plug.
L
ABEL
ALL
WIRES
PRIOR
TO
DISCONNECTION
WHEN
SERVICING
CONTROLS
. W
IRING
ERRORS
CAN
CAUSE
IMPROPER
AND
DANGEROUS
OPERATION
. V
ERIFY
PROPER
OPERATION
AFTER
SERVICING
.
CAUTION
3. Remove four (4) screws securing the burner box top.
T
HE
IGNITER
IS
FRAGILE
AND
CAN
BE
EASILY
DAMAGED
. U
SE
EXTREME
CAUTION
WHEN
REMOVING
THE
BURNER
BOX
TOP
.
CAUTION
4. Remove the screws securing the burners to the burner
bracket. Remove the burners.
5. Use bottle brush to clean burner insert and inside of burner.