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Inlet gas supply pressures must be maintained within the ranges
specified in the following table. The supply pressure must be
constant and available with all other household gas fired appli-
ances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must not
be exceeded to prevent unit overfiring.
INLET GAS SUPPLY PRESSURE
Natural Gas
Minimum: 4.5" w.c.
Propane Gas
Minimum: 11.0" w.c.
H
A
D
IGH
LTITUDE
ERATE
When this furnace is installed at high altitude, the appropriate
High Altitude orifice kit must be applied. This is required due to
the natural reduction in the density of both the gas fuel and com-
bustion air as altitude increases. The kit will provide the proper
design certified input rate within the specified altitude range.
High altitude kits are purchased according to the installation alti-
tude and usage of either natural or propane gas. Consult the
furnace Specification Sheet for appropriate kits.
Do not derate the furnace by adjusting the manifold pressure to a
lower pressure than specified on the furnace rating plate. The
combination of the lower air density and a lower manifold pressure
will prohibit the burner orifice from drawing the proper amount of air
into the burner. This may cause incomplete combustion, flash-
back, and possible yellow tipping.
In some areas the gas supplier may artificially derate the gas in an
effort to compensate for the effects of altitude. If the gas is artifi-
cially derated, the appropriate orifice size must be determined
based upon the BTU/ft
3
content of the derated gas and the alti-
tude. Refer to the National Fuel Gas Code, NFPA 54/ANSI Z223.1,
and information provided by the gas supplier to determine the proper
orifice size.
A different pressure switch may be required at high altitude regard-
less of the BTU/ft
3
content of the fuel used. Consult the furnace
Specification Sheet for pressure switch.
P
G
C
ROPANE
AS
ONVERSION
P
,
OSSIBLE
PROPERTY
DAMAGE
OCCUR
IF
THE
CORRECT
CONVERSION
APPROPRIATE
KITS
MUST
BE
APPLIED
. A
FURNACE
OPERATION
LL
CONVERSIONS
QUALIFIED
INSTALLER
OR
SERVICE
This unit is configured for natural gas. The appropriate
manufacturer's propane gas conversion kit, must be applied for
propane gas installations. Refer to the Propane Gas and/or High
Altitude Installations for details.
Consult the furnace Specification Sheet for a listing of appro-
priate kits. The indicated kits must be used to insure safe and
proper furnace operation. All conversions must be performed by a
qualified installer, or service agency.
Maximum: 10.0" w.c.
Maximum: 13.0" w.c.
WARNING
PERSONAL
INJURY
OR
DEATH
MAY
. T
KITS
ARE
NOT
INSTALLED
TO
ENSURE
SAFE
AND
PROPER
MUST
BE
PERFORMED
.
AGENCY
G
V
AS
ALVE
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. As shipped,
the valve is configured for natural gas. The valve is field convertible
for use with propane gas by replacing the regulator spring with a
propane gas spring from an appropriate manufacturer's propane
gas conversion kit. Taps for measuring the gas supply pressure
and manifold pressure are provided on the valve.
The gas valve has a manual ON/OFF control located on the valve
itself. This control may be set only to the "ON" or "OFF" position.
Refer to the lighting instructions label or Startup Procedure &
Adjustment for use of this control during start up and shut down
periods.
G
P
C
AS
IPING
T
O
AVOID
POSSIBLE
DAMAGE
DUE
/
OF
NATURAL
PROPANE
/
THE
METER
TANK
When sizing a trunk line, be sure to include all appliances which
will operate simultaneously when sizing a trunk line.
The gas piping supplying the furnace must be properly sized based
on the gas flow required, specific gravity of the gas, and length of
the run. The gas line installation must comply with local codes, or
in their absence, with the latest edition of the National Fuel Gas
Code, NFPA 54/ANSI Z223.1.
Length of
Pipe in Feet
10
20
30
40
50
60
70
80
90
100
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
HE
CFH = BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
BY
A
To connect the furnace to the building's gas piping, the installer
must supply a ground joint union, drip leg, manual shutoff valve,
and line and fittings to connect to gas valve. In some cases, the
installer may also need to supply a transition piece from 1/2" pipe
to a larger pipe size.
31
ONNECTIONS
WARNING
UNSATISFACTORY
OPERATION
TO
UNDERFIRING
OR
EQUIPMENT
GAS
PIPING
NEEDED
WHEN
.
TO
THE
FURNACE
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Nominal Black Pipe Size
1/2"
3/4"
1"
132
278
520
92
190
350
73
152
285
63
130
245
56
115
215
50
105
195
46
96
180
43
90
170
40
84
160
38
79
150
OF
EQUIPMENT
,
USE
THE
PROPER
SIZE
RUNNING
PIPE
FROM
1 1/4"
1 1/2"
1050
1600
730
1100
590
980
500
760
440
670
400
610
370
560
350
530
320
490
305
460
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