Goodman Mfg CVC9/95 User Manual

51

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.

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 as indicated in the Specifica-
tions Sheet.

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,  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.

12. Severe heat exchanger fouling is an indication of an

operational problem.  Perform the checks listed in  Startup
Procedure and Adjustments to reduce the chances of
repeated fouling.

•

Cycle the furnace with the thermostat at least three times.
Verify cooling and fan only operation.

•

Review the Owner’s Manual with the homeowner and
discuss proper furnace operation and maintenance.

•

Leave literature packet near furnace.

•

When ordering any of the listed functional parts, be sure to
provide the furnace model, manufacturing, and serial
numbers with the order.

•

Although only functional parts are shown in the parts list,
all sheet metal parts, doors, etc. may be ordered by
description.

•

Parts are available from your distributor.

Functional Parts List-

Gas Valve

Blower Motor

Gas Manifold

Blower Wheel

Natural Gas Orifice

Blower Mounting Bracket

Propane Gas Orifice

Blower Cutoff

Igniter

Blower Housing

Flame Sensor

Inductor

Rollout Limit Switch

Heat Exchanger with

Primary Limit Switch

Recuperator Coil

Auxiliary Limit Switch

Coil Front Cover

Pressure Switch

Integrated Control Module

Induced Draft Blower

Transformer

Door Switch