GMES8 GCES8 Installation Instructions
29
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
REM OVE
ANY
INTERNAL
COM PARTM EN T
COVERS
OR
ATTEM PT
ANY
ADJUSTM ENT
.
E
LECTRICAL
COM PONENTS
ARE
CONTAINED
IN
BOTH
COM PARTM ENTS
.
C
ONTACT
A
QUALIFIED
SERVICE
AGENT
AT
ONCE
IF
AN
ABNORM AL
FLAM E
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 ex-
tend directly outward from the burner ports without curling down-
ward, 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
W IRES
PRIOR
TO
DISCONNECTION
W HEN
SERVICING
CON TROLS
. W
IRING
ERRORS
CAN
CAUSE
IM PROPER
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
DAM AGED
. U
SE
EXTREM E
CAUTION
W HEN
REM OVIN G
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.
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 M anual with the homeowner and
discuss proper furnace operation and maintenance.
• Leave literature packet near furnace.
FILTERS
T
O
AVOID
PROPERTY
DAM AGE
,
PERSONAL
INJURY
OR
DEATH
,
DISCONNECT
ELECTRICAL
POW ER
BEFORE
REM OVING
FILTERS
. N
EVER
OPERATE
FURNACE
W ITHOUT
A
FILTER
INSTALLED
BECAUSE
DUST
AND
LINT
W ILL
BUILD
UP
ON
INTERNAL
PARTS
RESULTIN G
IN
LOSS
OF
EFFICIENCY
,
EQUIPM ENT
DAM AGE
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 inad-
equate heating or cooling performance. Filters should be cleaned
(permanent) or replaced (disposable) every two months or as re-
quired.
HIGH VOLTAGE!
T
O
PREVENT
PROPERTY
DAM AGE
,
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POW ER
TO
THE
FURNACE
BEFORE
REM OVIN G
THE
FILTER
OR
PERFORM ING
ANY
OTHER
M AINTENANCE
.
WARNING
Become familiar with filter location and procedures for removal,
cleaning and replacing them. If help is needed, contact the in-
staller of the furnace or a qualified servicer.
FILTER REM OVAL
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 M inimum
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. For further details, see your distributor.
INDUCED DRAFT AND CIRCULATOR BLOW ER M OTORS
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No fur-
ther lubrication is required. Check motor windings for accumula-
tion of dust which may cause overheating. Clean as necessary.
FLAM E 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