Carrier 59SC2A - Page 74

59SC2A
CA UN Le:
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.
14.
15.
16.
17.
18.
Check for gas leaks with a commercially available soap
solution made specifically for the detection of leaks.
Turn gas on at electric switch on gas valve and at external
shut-off or meter
Turn power on at external disconnect, fuse or circuit break-
er.
Run the furnace through two complete heating cycles to
check for proper operation
Install control door when complete.
Servicing Hot Surface Igniter
The igniter does NOT require annual inspection. Check igniter
resistance before removal. Refer to Fig. 57,58 and 63.
1.
2.
3.
4.
3.
Turn off gas and electrical supplies to furnace.
Remove control door.
Disconnect igniter wire connection.
Check igniter resistance. Igniter resistance is affected by
temperature. Only check resistance when the igniter is at
room temperature.
a. Using an ohm meter, check resistance across both igniter
leads in connector.
b. Cold reading should be between 40 ohms and 70 ohms.
Remove igniter assembly.
a. Using a 1/4-in. driver, remove the two screws securing the
igniter mounting bracket to the burner assembly See Fig.
63.
b. Carefully withdraw the igniter and bracket assembly
through the front of the burner assembly without striking
the igniter on surrounding parts.
c. Inspect igniter for signs of damage or failure.
d. If replacement is required, remove the screw that secures
the igniter on igniter bracket and remove the igniter.
. To replace igniter and bracket assembly, reverse items 5a
through 5d.
. Reconnect igniter harness to the igniter, dressing the igniter
wires to ensure there is no tension on the igniter itself. See
Fig. 63.
8. Turn on gas and electrical supplies to furnace.
9. Verify igniter operation by initiating control board self-test
10.
feature or by cycling thermostat.
Replace control door.
Flushing Collector Box and Drainage System
A A SS
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.
1.
2.
3.
Turn off gas and electrical supplies to furnace.
Remove control door.
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.
7.
8.
Remove the collector box plug from the top port on the up-
per corner of the collector box. See Fig. 59.
. Attach a funnel with a flexible tube to port on the collector
box.
. Flush inside of collector box with water until discharge
water from condensate trap is clean and runs freely.
Repeat steps 4 thru 6 with middle plug on upper corner of
collector box.
Remove the pressure switch tube from the collector box.
NOTE: Do NOT blow into tube with tube connected to the
pressure switch.
9.
10.
11.
12.
13.
Clean pressure switch port on collect box with a small wire.
Shake any water out of pressure switch tube.
Reconnect tube to pressure switch and pressure switch port.
Remove the relief tube from the port on the collector box
and the trap.
Clean the relief port on collect box and the trap with a smail
wire. Shake any water out of the tube.
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.
WW
a
Disconnect power at external disconnect, fuse or circuit
breaker.
. Turn off gas at external shut-off or gas meter.
. Remove control door and set aside.
. Turn electric switch on gas valve to OFF.
. Disconnect external drain from condensate drain elbow or
drain extension pipe inside the furnace and set aside.
. Disconnect the condensate trap relief hose from collector
box port and condensate trap.
NOTE: If condensate has a heat pad attached to the trap, trace the
wires for the pad back to the connection point and disconnect the
wires for the heat pad.
7. Remove the screw that secures the condensate trap to the
collector box, remove the trap and set aside.
. Remove the trap gasket from the collector box if it did not
come off when the trap was removed.
. Discard the old trap gasket.
. Rinse condensate trap in warm water until trap is clean.
. Flush condensate drain lines with warm water. Remember
to check and clean the relief port on the collector box.
. Shake trap dry.
. Clean port on collector box with a smail wire.
To re-install Condensate Drain and Trap:
1.
. Install gasket on collector box
. Align the condensate trap with the drain opening on the col- WW
fs
a
74
Remove adhesive backing from condensate trap gasket
lector box and secure the trap with the screw
. Attach the relief hose to the relief port on the condensate
trap and collector box.
. Secure tubing to prevent any sags or traps in the tubing.
. Connect condensate drain elbow or drain extension elbow
to the condensate trap
. Connect the leads of the condensate heat pad (if used)
. Connect external drain piping to the condensate drain elbow
or drain extension pipe.