National Comfort Product 14208309/HS038, Instructions Manual

The ignitor assembly may be removed and cleaned using 

6. 

emery cloth.  The spark gap should be set at 1/8”.

 The venter motor bearings are permanently lubricated. 

7. 

Lubrication of the motor is not recommended. 

Burner Orifice:

This device generally does not need cleaning and only needs to 

be changed when a change of gas is involved.  The orifice sizes 

that are used with natural or L.P. gas are shown on the rating 

plate.  Orifices and labels are available from National Comfort 

Products when the gas is being field converted to a different gas 

than shown on the rating plate and label.  It is also necessary 

to reset the combination gas valve to the proper outlet pressure 

shown on the rating plate.  To prevent dropping the orifice into 

the burner housing, temporarily place something the size of a 

credit card across the venturi.  Be careful not to damage the 

venturi tube and/or the bracket.

Burner Service:

The need to disassemble and clean the burner assembly is 

indicated when there is an accumulation of dirt, dust or lint in the 

burner/control compartment.  After cleaning the compartment, 

remove the burner as described below:

Shut the gas supply off ahead of the combination valve.

1. 

Turn off the electric supply.

2. 

Remove the entire upper access panel to expose the heat 

3. 

exchanger section and the burner/control compartment.

Carefully  loosen  and  remove  the  gas  supply  tube.                                   

4. 

Mark and disconnect the pressure switch wires.  Disconnect 

5. 

the tubing and remove the pressure switch.

 Locate the secondary air shield end cap.  Remove the 

6. 

four screws holding it to the air shield and remove the end 

cap.

 Locate the upper burner brackets (one on each side). 

7. 

Remove the two screws (one on each side) that attach the 

burner assembly to the secondary air shield assembly.

 Tilt the burner assembly slightly and lift it free from the 

8. 

retaining track under the burner assembly.  Remove the 

burner assembly from the cabinet.

If the Comfort Pack is installed so that supply ducts carry 

11. 

air circulated by the furnace to areas outside the space 

containing the furnace, the return air shall also be handled 

by a duct(s) sealed to the furnace casing and terminating 

outside the space containing the furnace.  The supply air 

duct should be equipped with a removable inspection panel 

to allow for future inspections of the heat exchanger.

The Comfort Pack unit contains a 16” x 25” x 1” air filter 

12. 

located on the cooling chassis.  Replacement of this filter 

with an equivalent type is necessary to maintain the perfor-

mance of the furnace.  The condition of the filter should be 

checked at least monthly.  The air filter may be accessed 

by shutting off the unit and removing the lower access 

panel.  The air filter may be removed by sliding it out of the 

filter holders.  The unit should not be operated without the 

filter and lower access panel in place.

 The installation is to be adjusted to obtain a temperature 

13. 

rise within the range(s) specified on the appliance rating 

plate.

Warning: Power must be disconnected before servicing

.

The air filter located on the cooling chassis should be maintained 

regularly.  It should be checked at least monthly.  Longer 

intervals between servicing may be justified depending upon the 

hours of unit operation and the cleanliness of the environment.  

A dirty air filter can adversely affect both heating and cooling 

operations, reduce heat exchanger life and increase energy 

usage. 

Caution: Label all wires prior to disconnection when 

servicing controls.  Wiring errors can cause improper and 

dangerous operation

.

The furnace is designed to operate efficiently for many heating 

seasons with minimal servicing.  The following procedures 

should be done on an annual basis, more often if the unit is in 

a dusty environment:

Clean all dirt, lint and grease from the combustion air 

1. 

openings and venter motor.  If an accumulation of dirt, dust 

or lint is found in the burner/control compartment, it will be 

necessary to clean the compartment and to provide “burner 

service” as outlined below.

 Inspect the heat exchanger.  If the supply air is ducted, 

2. 

remove the inspection panel from the duct to observe the 

heat exchanger.  Clean if necessary.  Check for cracks 

or holes. Replace the heat exchanger if any cracks or 

holes are found. Do not attempt to repair a damaged heat 

exchanger.  Also, refer to “burner service” for additional 

information on inspecting the heat exchanger.

Check the burner for scale, dust or lint accumulation.  

3. 

Clean if needed.

Check the vent system for soundness.  Replace any parts 

4. 

that do not appear sound.

Check the wiring for any damage and replace if 

5. 

necessary.

2

Furnace Service