SERVICING THE FURNACE
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could result
in dangerous operation, serious injury, death or
property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property damage.
•
Before servicing, disconnect all electrical
power to furnace.
•
When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
•
Verify proper operation after servicing.
The ability to properly perform maintenance on this
equipment requires certain mechanical skills and
tools. If you are at all uncertain, contact your
dealer for qualified maintenance and service since
improper service could lead to furnace shutdown or
a hazardous condition which could lead to an
unsafe condition and bodily harm.
Combustion Component Check:
The heat exchanger, gas burners and venting system
must be checked each year, prior to the heating season,
by a qualified dealer/serviceman.
The following procedures should be performed:
1. Remove the burner/manifold assembly from the
furnace, follow the instructions found on this page.
2. Place the burner/manifold assembly on a flat work
area and vacuum the burners. It might be necessary
to use a soft bristly brush to remove dirt and then
vacuum.
3. Remove the burner opening inlet plate and the flue
collector box. This will expose both the burner and
flue openings of the primary heat exchangers.
4. Vacuum the length of each heat exchanger tube
using a straight attachment into the burner openings
and the flue openings.
5. Replace the flue collector box, burner opening inlet
plate, and burner/manifold assembly. Insure that all
gaskets are properly positioned and that no leaks
exist.
6. Reattach all wiring and piping as per the wiring
diagram and installation instructions.
7. Turn on utilities and check for leaks using soapy
water and a brush.
8. A visual check of the main burner should be made at
the beginning of each heating season.
9. Check the input rate and adjust if necessary.
10. Perform a safety check of the limit control and
pressure switch.
11. Check the air filter, clean and/or replace as
necessary.
12. Periodic cleaning of condensing coil and drain lines
maybe necessary for proper operation.
13. Replace the appropriate access panels or door.
Never use an open flame when testing for gas
leaks! Use of an open flame could lead to a fire or
explosion!
Many soaps used for leak testing are corrosive to
certain metals. Piping must be rinsed thoroughly
with clean water after leak check has been
completed.
Manifold (or Burner/Manifold) Removal/Replacement:
1.
Make sure that all utilities (gas and electricity) are
turned off upstream of the furnace.
2.
Remove the access door by sliding the door straight
up, swinging the bottom of the door away from the
furnace, and pulling the door down and out of the
furnace (See Figure 33).
3.
Disconnect the gas line from the gas valve. Be sure
that a wiring diagram is available, or be ready to
mark any wires that are disconnected. Unplug the
three connectors from the gas valve.
Figure 33
FURNACE PANEL REMOVAL
20558801
Issue 0442
Page 29 of 32
Summary of Contents for Gas-Fired Furnace
Page 13: ...FURNACE WIRING SPECIFICATIONS 20558801 Issue 0442 Page 5 of 32 ...
Page 21: ...Figure 8 20558801 Issue 0442 Page 13 of 32 VENT TERMINATION CLEARANCES ...
Page 36: ...SEQUENCE OF OPERATION DIRECT IGNITION SYSTEM CONTROL 20558801 Issue 0442 Page 28 of 32 ...
Page 40: ...WIRING DIAGRAM 20558801 Issue 0442 Page 32 of 32 ...