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NOTE: Use only propane- -resistant pipe dope. Do not use Teflon
tape.
9. Insert the gas pipe through the grommet in the casing. Ap-
ply a thin layer of pipe dope to the threads of the pipe and
thread the pipe by into the gas valve.
NOTE: Use a back- -up wrench on the gas valve to prevent the
valve from rotating on the manifold or damaging the mounting to
the burner box.
10. With a back- -up wrench on the inlet boss of the gas valve,
finish tightening the gas pipe to the gas valve.
11. Turn gas on at electric switch on gas valve.
12. Turn power on at external disconnect, fuse or circuit break-
er.
Vent Pipe Installation
1. Insert the vent pipe through the intended vent opening of
the furnace casing and insert into the outlet of the inducer
vent elbow.
2. Tighten the clamp for the vent pipe at vent elbow on the
inducer assembly.
3. Align the remaining vent pipe system to the vent pipe in the
furnace casing.
4. Solvent cement the pipes as required for the type of material
used.
5. Tighten both clamps at the vent pipe support attached to
furnace casing.
Unit Checkout
WARNING
!
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.
1. Set thermostat to "OFF".
2. Turn on power at external disconnect, fuse or circuit break-
er.
3. Turn on gas at external shut- -off or gas meter.
4. Check for gas leaks with a commercially available soap
solution made specifically for the detection of leaks.
5. Manually close blower door switch.
6. Initiate component test through circuit board by referring to
"Component Test" on status code label on blower access
door for complete test sequence information.
7. If any status codes are flashed, refer to status code label on
unit blower door.
8. Turn thermostat fan switch to "ON", "Continuous" or jump-
er R to G terminals at furnace control board.
9. Check for air leakage around cell panel. It may be necessary
to remove heat exchanger assembly and top gasket between
cell panel and furnace casing top plate. Re- -install and re- -
check for blower air leaks.
10. Remove jumper(s) or set thermostat fan to "Auto" or
"OFF".
11. Release blower door switch.
12. Install blower access door.
13. Set thermostat to call for heat.
14. Allow unit to initiate a complete call for heat cycle.
15. Check for air leakage around collector box. A whistling
noise may indicate air leak in collector box seal.
NOTE: If there is a severe air leak in the collector box seal,
pressure switch may not close or will re- -open, resulting in no
ignition or erratic burner operation.
NOTE: Heat Exchanger failure may have been caused by one or
more of the following conditions. As part of the system check- -out,
verify that the following conditions are not affecting the operation
of the furnace:
S Short Cycling- -Defective thermostat:
anticipator setting, dirty filter or over- -sized furnace.
S Under firing/low Btu input: Set manifold pressure and verify
firing rate as shown on rating plate by clocking the gas meter.
S Over- -firing/high Btu input: Set manifold pressure and verify
firing rate as shown on rating plate by clocking the gas meter.
S Low temperature rise: Set unit for correct temperature rise range
as shown on unit rating plate.
S Contaminated combustion air: Remove contaminates or provide
ample fresh air for combustion.
S Excessive amounts of outside ventilation air: Return air
temperature cannot be below 60 degrees F for extended periods of
time.
S Incorrect venting or termination: Recirculation of products of
combustion into the combustion air pipe can damage the furnace.
Verify proper venting and vent termination per installation
instructions. For additional information, and a complete sequence
of furnace operation, refer to furnace Installation, Start- -Up and
Operating Instructions.
16. After System Check- -out is complete, set thermostat below
room temperature.
17. Verify that burner shuts down and blower completes selec-
ted off delay time.
18. Verify furnace operates properly and set thermostat to de-
sired room temperature.
19. Re- -install outer door.
8
Incorrect thermostat
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