13
Table 4. Capacity of Black Iron Gas Pipe (cubic feet per
hour) for Natural Gas (specifi c gravity = .60).
required depend on the installation altitude and the heating
value of the gas. The gas heating value based on sea level
can be obtained from your local gas utility. The heating
value of gas at high altitude is always lower than the sea
level heating value. The heating values used in the
Tables
5 & 6
are based on sea level values.
Natural Gas High Altitude Conversion
All factory shipped furnaces are ready to operate between
zero and 4999 ft. above sea level. For higher altitudes
(between 5000 and 10,000 ft. above sea level), conversion
can be achieved simply by adjusting the furnace manifold
pressure as shown in
Table 5
.
LP/Propane Gas Conversion
IMPORTANT NOTE: When converting a low NOx
Furnace from Natural gas to LP/Propane gas, it is
necessary to remove the NOx Baffl es.
Conversion of this furnace to utilize LP/Propane gas
must be made by qualifi ed service personnel, using
approved parts. Conversion for the LP/Propane gas can
be accomplished by adjusting the manifold pressure, after
replacing the natural gas orifi ces with the appropriate
LP/Propane orifi ces shown in
Table 6
. Note: that for
installations between zero and 5000 ft. above sea level,
a #54 drill size orifi ce should be used. However for
installations above 5000 ft. over sea level, a # 55 drill size
orifi ce should be used. Then use
Table 6
to determine the
appropriate manifold pressure for your altitude installation.
Conversion to LP/Propane (sea level and high altitude ) is
detailed in the installation instructions provided with the
conversion kit. Approved conversion kits are:
United States LP/Propane Gas Sea Level and High Altitude
Conversion Kit - P/N 904090A
This kit is for LP/propane conversion in the United States
at altitudes between zero and 10,000 ft. above sea level.
Follow the installation instructions supplied with the kit
for proper installation.
Canadian LP/Propane Gas Sea Level and High Altitude
Conversion Kit - P/N 904091A.
This kit is for LP/propane
conversions in Canada at altitudes between zero and
4500 ft. above sea level. Follow the installation instructions
supplied with the kit for proper installation.
WARNING:
To avoid the risk of electrical shock, personal
injury, or death, disconnect all electrical power
to the unit before performing any maintenance
or service. The unit may have more than one
electrical power supply.
WARNING:
The unit cabinet must have an uninterrupted or
unbroken electrical ground to minimize personal
injury if an electrical fault should occur. This
ground may consist of electrical wire or approved
conduit when installed in accordance with
existing national or local codes.
ELECTRICAL WIRING
General —
Electrical power wiring must be made in
accordance with all applicable local codes and ordinances,
and with the current revision of the National Electric Code
NFPA 70 or in Canada CSA C.22.1 Canadian Electrical
Code Part 1. If any of the original wire as supplied with the
unit must be replaced, it must be replaced with material
of the same gauge and temperature rating.
Line Voltage —
Before proceeding with the electrical
connections, make certain that the voltage, frequency
and phase of the supply source are the same as those
specifi ed on the unit rating plate. Also verify that the
service provided by the utility is suffi cient to handle the
additional load imposed by this equipment.
This unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with
the National Electrical Code (ANSI/NFPA 70) or the CSA
C22.1 Electrical Code.
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60
NOMINAL
BLACK
IRON
PIPE DIA.
(in.)
LENGTH OF PIPE RUN (feet)
10
20
30
40
50
60
70
80
1/2
130
90
75
65
55
50
45
40
3/4
280
190
150
130
115
105
95
90
1
520
350
285
245
215
195
180
170
1 1/4
1050
730
590
500
440
400
370
350
1 1/2
1600
100
890
760
670
610
560
530
The cubic feet per hour listed in the table above must be greater than the cubic
feet per housr of gas fl ow required by the unit.
To determine the cubic feet per hour of gas fl ow required by the unit, divide the
inputrate of the unit by the heating value of the gas:
Cubic Feet Per Hour Required =
Input To Unit (Bth/hr)
Heating Value of Gas (Btu/Cu. Ft.)
