Installation Guide
21
air cleaner neutral terminals are identifi ed as NEUTRAL. All fi eld
wiring must conform to applicable codes. Connections should be
made as shown.
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module humidifi er terminal (HUM) is
energized with 115 volts whenever the induced draft blower
is energized. The integrated control module electronic air
cleaner terminal (EAC) is energized with 115 volts whenever
the circulator blower is energized. This terminal can also be
used to provide 115 volt power to a humidifi er transformer.
The remaining primary transformer wire would be connected
to the Line N on the control board.
HIGH VOLTAGE !
T
O
AVOID
PERSONAL
INJURY
OR
DEATH
DUE
TO
ELECTRICAL
SHOCK
,
DISCONNECT
ELECTRICAL
POWER
BEFORE
SERVICING
OR
CHANGING
ANY
ELECTRICAL
WIRING
.
WARNING
Accessories - Accessories Wiring
Figure 19
GAS SUPPLY AND PIPING
T
O
AVOID
POSSIBLE
UNSATISFACTORY
OPERATION
OF
EQUIPMENT
DAMAGE
DUE
TO
UNDERFIRING
OR
EQUIPMENT
,
USE
THE
PROPER
SIZE
OF
NATURAL
/
PROPANE
GAS
PIPING
NEEDED
WHEN
RUNNING
PIPE
FROM
THE
METER
/
TANK
TO
THE
FURNACE
.
WARNING
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
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
specifi ed in the adjacent table. The supply pressure must be
constant and available with all other household gas fi red ap-
pliances operating. The minimum gas supply pressure must
be maintained to prevent unreliable ignition. The maximum
must not be exceeded to prevent unit overfi ring.
HIGH ALTITUDE DERATE
When this furnace is installed at high altitude, the appropriate High
Altitude orifi ce kit must be applied. This is required due to the nat-
ural reduction in the density of both the gas fuel and combustion
air as altitude increases. The kit will provide the proper design
certifi ed input rate within the specifi ed altitude range.
High altitude kits are purchased according to the installation altitude
and usage of either natural or propane gas. Consult the furnace
Specifi cation Sheet for appropriate kits.
Do not derate the furnace by adjusting the manifold pressure
to a lower pressure than specifi ed on the furnace rating plate.
The combination of the lower air density and a lower manifold
pressure will prohibit the burner orifi ce from drawing the proper
amount of air into the burner. This may cause incomplete
combustion, fl ashback, and possible yellow tipping.
In some areas the gas supplier may artifi cially derate the gas
in an effort to compensate for the effects of altitude. If the
gas is artifi cially derated, the appropriate orifi ce size must be
determined based upon the BTU/ft
3
content of the derated
gas and the altitude. Refer to the National Fuel Gas Code,
NFPA 54/ANSI Z223.1, and information provided by the gas
supplier to determine the proper orifi ce size.
A different pressure switch may be required at high altitude
regardless of the BTU/ft
3
content of the fuel used. Consult the
furnace Specifi cation Sheet for pressure switch.
WARNING
P
OSSIBLE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
MAY
OCCUR
IF
THE
CORRECT
CONVERSION
KITS
ARE
NOT
INSTALLED
. T
HE
APPROPRIATE
KITS
MUST
BE
APPLIED
TO
ENSURE
SAFE
AND
PROPER
FURNACE
OPERATION
. A
LL
CONVERSIONS
MUST
BE
PERFORMED
BY
A
QUALIFIED
INSTALLER
OR
SERVICE
AGENCY
.
PROPANE GAS CONVERSION
This unit is confi gured for natural gas, but may be converted for
use with L.P. gas. Refer to the section on PROPANE GAS/
HIGH ALTITUDE INSTALLATIONS for L.P. kit selection.
Consult the furnace Specifi cation Sheet for a listing of appro-
priate kits. The indicated kits must be used to insure safe and