Filters; Filter Maintenance; Filter Removal; Nduced Raft And Irculator Lower Otors - Goodman MH8 Installation Instructions Manual

• 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 electrical connections for tightness and/
or corrosion. Check wires for damage.
•

Filters.

F
ILTERS
T
O AVOID PROPERTY DAMAGE
DISCONNECT ELECTRICAL POWER
OPERATE FURNACE WITHOUT
LINT WILL BUILD UP ON INTERNAL
,
EFFICIENCY EQUIPMENT DAMAGE
A return air filter is not supplied with this furnace; however,
there must be a means of filtering all of the return air. The in-
staller will supply filter(s) at the time of installation.
F M
ILTER AINTENANCE
Improper filter maintenance is the most common cause of in-
adequate heating or cooling performance. Filters should be
cleaned (permanent) or replaced (disposable) every two months
or as required. When replacing a filter, it must be replaced with
a filter of the same type and size.
HIGH VOLTAGE!
T
O PREVENT PROPERTY DAMAGE
DEATH DUE TO ELECTRICAL SHOCK
ELECTRICAL POWER TO THE FURNACE
REMOVING THE FILTER OR PERFORMING
.
MAINTENANCE
Become familiar with filter location and procedures for removal,
cleaning and replacing them. If help is needed, contact the
installer of the furnace or a qualified servicer.
F R
ILTER 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 alter-
nate 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.
WARNING
, ,
PERSONAL INJURY OR DEATH
. N
BEFORE REMOVING FILTERS
A FILTER INSTALLED BECAUSE DUST
PARTS RESULTING IN LOSS OF
.
AND POSSIBLE FIRE
WARNING
,
PERSONAL INJURY OR
,
DISCONNECT
BEFORE
ANY OTHER
T
ROUBLESHOOTING
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.
I D
NDUCED RAFT AND
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 accumu-
lation of dust which may cause overheating. Clean as neces-
sary.
F S
LAME ENSOR
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
EVER
flame and will lock out. The flame sensor should be carefully
AND
cleaned by a qualified servicer using emery cloth or steel wool.
Following cleaning, the flame sense signal should be 1 to 6
microamps at 115 volts.
I (Q
GNITER UALIFIED
If the igniter and the surrounding air are at about 70°F and the
igniter wires are not connected to any other electrical compo-
nents, the resistance of the igniter should not exceed 75 ohms.
If it does, the igniter should be replaced.
B

URNERS

T
O PREVENT PERSONAL
INTERNAL COMPARTMENT
E
LECTRICAL COMPONENTS
C
ONTACT A QUALIFIED
FLAME APPEARANCE
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 (Q
LEANING UALIFIED
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
. W
CONTROLS IRING
. V
OPERATION ERIFY
3. Remove four (4) screws securing the burner box top.
35
& M
C B
IRCULATOR LOWER
(Q S O
UALIFIED ERVICER NLY
S O )
ERVICER NLY
WARNING
,
INJURY OR DEATH DO NOT
COVERS OR ATTEMPT ANY
ARE CONTAINED IN BOTH
SERVICE AGENT AT ONCE IF
.
SHOULD DEVELOP
S O )
ERVICER NLY
CAUTION
PRIOR TO DISCONNECTION WHEN
ERRORS CAN CAUSE IMPROPER
PROPER OPERATION AFTER SERVICING
AINTENANCE
M
OTORS
)
REMOVE ANY
.
ADJUSTMENT
.
COMPARTMENTS
AN ABNORMAL
SERVICING
AND DANGEROUS
.