15
At all altitudes, the manifold pressure must be within 0.3 inches
w.c. of that listed in the Specifi cation Sheet applicable to your
model for the fuel used. At all altitudes and with either fuel,
the air tempera ture 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.
H
IGH
A
LTITUDE
D
ERATE
High altitude installations may require both a pressure switch
and an orifi ce change. These changes are necessary to com-
pensate for the natural reduction in the density of both the gas
fuel and the combustion air at higher altitude.
Clearance in accordance with local installation codes, the
requirements of the gas supplier and the manufacturer’s
installation instructions.
Dégaugement conforme aux dodes d’installation locaux, aux
exigences du fournisseur de gaz et aux instructions d’instal-
lation du fabricant.
High Stage Low Stage
Natural
None
#45
3.5" w.c.
1.9" w.c.
None
Propane
LPM-06 H/W
GAS VALVE
#55
10.0" w.c.
6.0" w.c.
None
Propane 0-7000
LPM-08 W-R
VALVE
#55
10.0" w.c.
6.0" w.c.
None
NOTE:
In Canada, gas furnaces are only certified to 4500 feet.
Gas
0-7000
Manifold Pressure
Pressure
Switch Change
Altitude
Kit
Orifice
Consult the furnace Specifi cation Sheet for appropriate manu-
facturer’s kits for propane gas and/or high altitude installations.
The indicated kits must be used to insure safe and proper
furnace operation. All conversions must be performed by a
qualifi ed installer, or service agency.
P
ROPANE
G
AS
C
ONVERSION
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
.
This unit is confi gured for natural gas. The appropriate man-
ufacturer’s propane gas conversion kit must be applied for
propane gas installations.
If converting to LP gas, it is recommended that an LPLP0* kit
also be installed. The use of this kit will prevent the furnace
from fi ring when the LP gas supply pressure is too low to
support proper combustion.
G
AS
P
IPING
C
ONNECTIONS
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
When sizing gas lines, be sure to include all appliances which
will operate simultaneously.
The gas piping supplying the furnace must be properly sized
based on the gas fl ow required, specifi c 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.
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)
CFH =
BTUH Furnace Input
Heating Value of Gas (BTU/Cubic Foot)
To connect the furnace to the building’s gas piping, the install-
er must supply a ground joint union, drip leg, manual shutoff
valve, and line and fi ttings 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.
The following stipulations apply when connecting gas piping.
•
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.
•
Use black iron or steel pipe and fi ttings for the building
piping.
•
Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
•
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.
•
Use two pipe wrenches when making connection to
the gas valve to keep it from turning. The orientation
of the gas valve on the manifold must be maintained
as shipped from the factory.
•
Install a manual shutoff valve between the gas
meter and unit within six feet of the unit. If a union
is installed, the union must be downstream of the
manual shutoff valve, between the shutoff valve and
the furnace.
•
Tighten all joints securely.
•
Connect the furnace to the building piping by one of
the following methods:
