Installation Guide

24
I&O manual
WARNING
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.
FIRE OR EXPLOSION HAZARD
WARNING
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Use proper length of pipe to avoid stress on gas control
manifold and a gas leak.
FIRE OR EXPLOSION HAZARD
WARNING
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If local codes allow the use of a flexible gas appliance connec-
tor, always use a new listed connector. Do not use a connector
which has previously served another gas appliance. Black iron
pipe shall be installed at the furnace gas control valve and
extend a minimum of 2 in. (51 mm) outside the furnace.
FIRE OR EXPLOSION HAZARD
CAUTION
Failure to follow this caution may result in property damage.
Connect gas pipe to gas valve using a backup wrench to avoid
damaging gas controls and burner misalignment.
FURNACE OVERHEAT HAZARD
8 GAS SUPPLY AND PIPING
The furnace rating plate includes the approved furnace gas input
rating and gas types. The furnace must be equipped to operate
on the type of gas applied. This includes any conversion kits
required for alternate fuels and/or high altitude.
Inlet gas supply pressures must be maintained within the ranges
specified in Table 11. The supply pressure must be constant and
available with all other household gas fired appliances operating.
The minimum gas supply pressure must be maintained to prevent
unreliable ignition. The maximum must not be exceeded to prevent
unit overfiring.
8.1 General
Table 11 - Inlet Gas Supply Pressure
Inlet Gas Supply Pressure
Propane Gas
Natural Gas
Minimum:11.0" W.C. Maximum:13.0" W.C.
Minimum:4.5" W.C. Maximum:10.5" W.C.
NOTE: Adjusting the minimum supply pressure below the limits
in the above table could lead to unreliable ignition. Gas input to
the burners must not exceed the rated input shown on the rating
plate. Overfiring of the furnace can result in premature heat
exchanger failure. Gas pressures in excess of 13 inches water
column can also cause permanent damage to the gas valve.
At all altitudes and with either fuel， the air temperature rise must
be within the range listed on the furnace nameplate. Should this
appliance be converted to LP， refer to the instructions included in
the factory authorized LP conversion kit.