26
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.
Cleaning (Qualified Servicer Only)
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.
6. Replace burner (opposite of removal). Ensure burners
are fully seated on burner bracket and are properly
aligned. Replace burner box top. Reconnect wiring.
7. Turn on electric power and gas supply to the furnace.
8. Check furnace for proper operation. Refer to
“Operational Checks”
section to verify burner flame
characteristics.
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.
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 al
-
ternate 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 up
-
flow installation, follow the directions provided with external
filter rack kit.
Induced Draft and Circulator Blower Mo
-
tors
The bearings in the induced draft blower and circulator blow-
er 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.
