54
T
O
AVOID
ELECTRICAL
SHOCK
,
INJURY
OR
DEATH
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
PERFORMING
ANY
MAINTENANCE
. I
F
YOU
MUST
HANDLE
THE
IGNITER
,
HANDLE
WITH
CARE
. T
OUCHING
THE
IGNITER
ELEMENT
WITH
BARE
FINGERS
,
ROUGH
HANDLING
OR
VIBRATION
COULD
DAMAGE
THE
IGNITER
RESULTING
IN
PREMATURE
FAILURE
. O
NLY
A
QUALIFIED
SERVICER
SHOULD
EVER
HANDLE
THE
IGNITER
.
WARNING
T
O
ENSURE
PROPER
UNIT
PERFORMANCE
,
ADHERE
TO
THE
FILTER
SIZES
GIVEN
IN
THE
RECOMMENDED
M
INIMUM
F
ILTER
S
IZE
T
ABLE
OR
S
PECIFICATION
S
HEET
APPLICABLE
TO
YOUR
MODEL
.
CAUTION
M
AINTENANCE
A
NNUAL
I
NSPECTION
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 fur-
nace components are in proper working order and that the heating
system functions appropriately. Pay particular attention to the fol-
lowing 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 signal.
•
Drainage system. Check for blockage and/or leakage. Check hose connections at and internal to furnace.
•
Wiring. Check electrical connections for tightness and/or corrosion. Check wires for damage.
•
Filters.
•
Use a combustion analyzer to check CO
2
level after 5 minutes of run time.
F
ILTERS
F
ILTER
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. When replacing a filter, it must be replaced with a filter of
the same type and size.
F
ILTER
R
EMOVAL
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 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.
H
ORIZONTAL
U
NIT
F
ILTER
R
EMOVAL
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.
M
EDIA
A
IR
F
ILTER
OR
E
LECTRONIC
A
IR
C
LEANER
R
EMOVAL
Follow the manufacturer’s directions for service.
B
URNERS
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.
