Induced Draft And Circulator Blowers; Condensate Trap And Drain System (Qualified Servicer Only ); Flame Sensor (Qualified Servicer Only ); Igniter (Qualified Servicer Only ) - Goodman GMH95 Installation Instructions Manual

out curling, floating, or lifting off. Flames must not impinge on the
sides of the heat exchanger firing tubes.
I D C
NDUCED RAFT AND IRCULATOR
The bearings in the induced draft blower and circulator blower
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.
C T D
ONDENSATE RAP AND
O )
NLY
Annually inspect the drain tubes, drain trap, and field-supplied drain
line for proper condensate drainage. Check drain system for hose
connection tightness, blockage, and leaks. Clean or repair as
necessary.
F S (Q
LAME ENSOR UALIFIED
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 emery cloth or steel wool. Following clean-
ing, the flame sense signal should be 1 to 6 microamps at 115
volts.
I (Q S
GNITER UALIFIED ERVICER
If the igniter and the surrounding air are at about 70°F and the
igniter wires are not connected to any other electrical components,
the resistance of the igniter should not exceed 75 ohms. If it does,
the igniter should be replaced.
F P (Q
LUE ASSAGES UALIFIED
The heat exchanger flue passageways should be inspected at the
beginning of each heating season. If necessary, clean the pas-
sageways as outlined below.
1. Turn OFF the electrical power and gas supply to the furnace.
2. Disconnect the gas line and remove the burner/ manifold
assembly by removing the screws securing the assembly
to the partition panel.
3. Disconnect the flue pipe system from the induced draft
blower.
4. Remove the induced draft blower and, drain and pressure
tap hoses from the recuperator coil front cover.
5. Remove the recuperator coil front cover to expose the coil
tubes and turbulators.
6. Remove the recuperator coil turbulators individually by slowly
pulling each turbulator forward firmly.
7. Clean the recuperator coil tubes using a long handle wire
brush, such as a gun cleaning brush.
8. Clean the primary heat exchanger tubes using a wire brush
attached to a length of high grade stainless steel cable,
such as drain cleanout cable. Attach a variable speed
reversible drill to the other end of the cable. Slowly rotate
the cable with the drill and insert it into one of the heat
exchanger tubes. While reversing the drill, work the cable
in and out several times to obtain sufficient cleaning. Repeat
for each tube.
9. Clean residue from furnace using a vacuum cleaner.
10. Replace the parts removed in the previous steps in reverse
order.
11. Turn on electrical power and gas to furnace. Check for
leaks and proper unit operation.
B
LOWERS
S (Q S
RAIN YSTEM UALIFIED
S O )
ERVICER NLY
O )
NLY
S O )
ERVICER NLY
12. Severe heat exchanger fouling is an indication of an
operational problem. Perform the checks listed in Section
XIV, Startup Procedure and Adjustments to reduce the
chances of repeated fouling.
Internal filters are an accessory item and are not included with your
furnace. For further details, see your distributor.
ERVICER
B R
OTTOM ETURN
1. Turn OFF electrical power to furnace.
2. Remove blower compartment door.
3. Push back and up on the wire filter retainer to release it
from under the front lip of the furnace basepan.
4. Slide filter forward and out.
5. Replace filter by reversing the procedure.
B C
LOWER OMPARTMENT
1. Turn OFF electrical power to furnace.
2. Remove blower compartment door.
3. Grasp lower portion of filter and lift up.
Front of Furnace
4. Angle filter toward the blower until filter clears bottom rail.
5. Lower filter down and pull outward.
Front of Furnace
6. Replace filter by reversing procedure.
33
XX. INTERNAL FILTER REMOVAL
R
EMOVAL
R
EMOVAL
Front of Furnace
Blower
Grab Here
And Lift
Front of Furnace
Blower
Blower
Blower