29
to the natural reduction in the density of both the gas fuel and
combustion air as altitude increases. The kit will provide the
range.
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Consult
Do not derate the furnace by adjusting the manifold pres-
rating plate. The combination of the lower air density and
from drawing the proper amount of air into the burner. This
yellow tipping.
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
regardless of the BTU/ft
3
content of the fuel used. Consult
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
.
for use with L.P. gas. Refer to the section on PROPANE GAS/
HIGH ALTITUDE INSTALLATIONS for L.P. kit selection.
appropriate kits. The indicated kits must be used to insure
safe and proper furnace operation. All conversions must
CAUTION
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
INLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
This unit is equipped with a 24 volt gas valve controlled during
furnace operation by the integrated control module. As shipped,
-
ible 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.
The gas piping supplying the furnace must be properly sized
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.
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of Nominal Black Pipe Size
Pipe in Feet 1/2" 3/4" 1" 1 1/4" 1 1/2"
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
To connect the furnace to the building’s gas piping, the installer
installer may also need to supply a transition piece from 1/2”
pipe to a larger pipe size.
The following stipulations apply when connecting gas piping.
Refer to Gas Piping Connections
connections to the furnace.
• Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not
distort the burner rack, manifold or gas valve.
•
chamfered, reamed, and free of burrs and chips. If
old pipe is used, be sure it is clean and free of rust,
scale, burrs, chips, and old pipe joint compound.
• Use pipe joint compound on male threads ONLY.
Always use pipe joint compound (pipe dope) that is
APPROVED FOR ALL GASSES. DO NOT apply compound
• Use ground joint unions.
• Install a drip leg to trap dirt and moisture before
it can enter the gas valve. The drip leg must be a
minimum of three inches long.
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