440 01 4801 00
71
Specifications subject to change without notice.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
death, and/or property damage.
Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially available
soap solution made specifically for the detection of leaks to
check all connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
!
WARNING
A11405
Fig. 71 -- Ignitor Position -- Top View
L12F041
Fig. 72 -- Ignitor Position -- Side View
14. Check for gas leaks with a commercially available soap so-
lution made specifically for the detection of leaks.
15. Turn gas on at electric switch on gas valve and at external
shut-off or meter
16. Turn power on at external disconnect, fuse or circuit break-
er.
17. Run the furnace through two complete heating cycles to
check for proper operation
18. Install control door when complete.
Servicing Hot Surface Ignitor
The ignitor does
NOT
require annual inspection. Check ignitor
resistance before removal. Refer to Fig. 71, 72 and 70.
1. Turn off gas and electrical supplies to furnace.
2. Remove control door.
3. Disconnect ignitor wire connection.
4. Check ignitor resistance. Igniter resistance is affected by
temperature. Only check resistance when the ignitor is at
room temperature.
a. Using an ohm meter, check resistance across both ignitor
leads in connector.
b. Cold reading should be between 40 ohms and 70 ohms.
5. Remove ignitor assembly.
a. Using a 1/4--in. driver, remove the two screws securing the
ignitor mounting bracket to the burner assembly See Fig.
70 .
b. Carefully withdraw the ignitor and bracket assembly
through the front of the burner assembly without striking
the ignitor on surrounding parts.
c. Inspect ignitor for signs of damage or failure.
d. If replacement is required, remove the screw that secures
the ignitor on ignitor bracket and remove the ignitor.
6. To replace ignitor and bracket assembly, reverse items 5a
through 5d.
7. Reconnect ignitor harness to the ignitor, dressing the ignitor
wires to ensure there is no tension on the ignitor itself. See
Fig. 70.
8. Turn on gas and electrical supplies to furnace.
9. Verify ignitor operation by initiating control board self--test
feature or by cycling thermostat.
10. Replace control door.
Flushing Collector Box and Drainage System
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Turn off the gas and electrical supplies to the furnace and
install lockout tag before performing any maintenance or
service. Follow the operating instructions on the label
attached to the furnace.
!
WARNING
1. Turn off gas and electrical supplies to furnace.
2. Remove control door.
3. Disconnect pressure switch tube from pressure switch port.
NOTE:
Ensure the pressure switch tube disconnected from the
pressure switch is higher than the collector box opening or water
will flow out of tube.
4. Remove the collector box plug from the top port on the up-
per corner of the collector box. See Fig. 62.
5. Attach a funnel with a flexible tube to port on the collector
box.
6. Flush inside of collector box with water until discharge wa-
ter from condensate trap is clean and runs freely.
7. Repeat steps 4 thru 6 with bottom plug on upper corner of
collector box.
8. Remove the pressure switch tube from the collector box.
NOTE
: Do
NOT
blow into tube with tube connected to the
pressure switch.
9. Clean pressure switch port on collect box with a small wire.
Shake any water out of pressure switch tube.
10. Reconnect tube to pressure switch and pressure switch port.
11. Remove the relief tube from the port on the collector box
and the trap.
12. Clean the relief port on collect box and the trap with a small
wire. Shake any water out of the tube.
13. Reconnect relief tube to trap and collector box ports.
Cleaning Condensate Drain and Trap
NOTE
: If the condensate trap is removed, a new gasket between
the trap and collector box is required. Verify a condensate trap
gasket is included in the service kit or obtain one from your local
distributor.
1. Disconnect power at external disconnect, fuse or circuit
breaker.
2. Turn off gas at external shut-off or gas meter.
3. Remove control door and set aside.
4. Turn electric switch on gas valve to OFF.
5. Disconnect external drain from condensate drain elbow or
drain extension pipe inside the furnace and set aside.
