28
ROOM THERMOSTAT
Y2
Y/Y1
C
G
R
W
Y2
Y/Y1
C
G
R
W
Y2
Y/Y1
C
G
R
W
TWIN
TWIN
COND UNIT
CONTACTOR
COND UNIT
CONTACTOR
FURNACE 1
FURNACE 2
T
O
PREVENT
UNRELIABLE
OPERATION
OR
,
THE
PRESSURE
BE
AS
ON
THE
UNIT
PLATE
NLY
SHOULD
BE
BY
THE
VALVE
PRESSURE
P
OSSIBLE
PROPERTY
,
PERSONAL
INJURY
OR
DEATH
OCCUR
THE
CORRECT
CONVERSION
KITS
ARE
NOT
INSTALLED
HE
APPROPRIATE
KITS
BE
APPLIED
TO
ENSURE
AND
PROPER
OPERATION
LL
CONVERSIONS
BE
BY
A
INSTALLER
OR
SERVICE
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
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 specied in the following table. The supply
pressure must be constant and available with all other
household gas red appliances operating. The minimum
gas supply pressure must be maintained to prevent
unreliable ignition. The maximum must not be exceeded
to prevent unit overring.
T
O
AVOID
POSSIBLE
OPERATION
DUE
TO
OR
,
USE
THE
PROPER
NATURAL
/
PROPANE
NEEDED
PIPE
THE
/
TANK
TO
THE
When this furnace is installed at high altitude, the
appropriate High Altitude Kit including orices and a
pressure switch(s) must be installed. These changes are
necessary to compensate for the natural reduction in the
density of both the gas fuel and the combustion air at
higher altitude.
Installation of this furnace at altitudes above 7000 ft (2134
m), shall be made in accordance with the Listed High
Altitude Conversion Kit available with this furnace.
Do not de-rate the furnace by adjusting the manifold
pressure to a lower pressure than specied on the furnace
rating plate. The combination of the lower air density and
a lower manifold pressure will prohibit the burner orice
from drawing the proper amount of air into the burner. This
may cause incomplete combustion, ashback, and yellow
tipping.
In some areas the gas supplier may articially derate the
gas in an eort to compensate for the eects of altitude.
If the gas is articially derated, the appropriate orice size
must be determined based upon the BTU/ft³ 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
orice size. A dierent pressure switch may be required
at high altitude regardless of the BTU/ft³ content of the
fuel used. Consult the furnace Specication Sheet. All
conversions must be performed by a qualied installer, or
service agency.
This furnace is shipped from the factory congured for
natural gas at standard altitude. To operate this furnace
on L.P. gas, a LPM-07 LP Conversion kit must be used.
Propane gas installations require an orice and spring
change to compensate for the energy content dierence
between natural and propane gas.
For furnaces being converted to LP gas, it is strongly
recommended that a LPLP03 kit also be installed. The
use of this kit will prevent the furnace from ring when
the LP gas supply pressure is too low to support proper
combustion.
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