GCES80 Installation Manual
26
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the ame sensor. This coating acts
as an insulator causing a drop in the ame sense signal. If the
ame sense signal drops too low the furnace will not sense
ame and will lock out. The ame sensor should be carefully
cleaned by a qualied servicer using steel wool. The ame
sense signal should be 1 to 3 microamps.
At room temperature, the igniter ohm reading should be from
37 - 68 ohms.
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 ames. Turn the furnace on at the thermostat.
Wait a few minutes, since any dislodged dust will alter the
normal ame 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, oating or lifting o the ports.
1. Shut o electric power and gas supply to the furnace.
2. Disconnect the rollout limit wires, ame 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 ame
characteristics.
• Wiring. Check that electrical connections are tight
and free from corrosion.
• 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 lter is not supplied with this furnace; however, there
must be a means of ltering all of the return air. The installer
will supply lter(s) at the time of installation.
Improper lter 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
Depending on the installation, diering lter arrangements can
be applied. Filters can be installed in either the central return
register or a side panel external lter rack (upow only). A
media air lter or electronic air cleaner can be used as an al-
ternate lter. Follow the lter 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 lters from an external lter rack in an upright up-
ow installation, follow the directions provided with external
lter rack kit.
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.