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IMPORTANT NOTES:
1.
Gas piping must not be run in or through air ducts,
chimneys, gas vents, elevator shafts, etc.
2.
Compounds used on threaded joints of gas piping must be
resistant to the actions of liquefied petroleum gases.
3.
The main manual gas valve and main power
disconnect to the furnace must be properly labeled
by the installer in case emergency shutdown is
required.
Leak Check — After the gas piping to the unit is complete,
all connections must be tested for gas leaks. To check for
leaks in gas piping systems, use only a soap and water
solution or other approved method.
IMPORTANT NOTE: When pressure testing the gas
supply lines at pressures greater than 1/2 psig (14
inches WC), the unit must be disconnected from the
gas supply piping system to prevent damage to the gas
control valve.
If the test pressure is less than or equal to 1/2 psig (14
inches WC), the unit must be isolated from the gas
supply line by closing the manual shut-off valve.
WARNING:
!
This unit was equipped at the factory for use with
natural gas only. A special kit, supplied by the
manufacturer, is required to convert the unit to
operate on LP/propane gas. Failure to use the
proper conversion kit can cause fire, explosion,
property damage, carbon monoxide poisoning,
personal injury, or death.
GAS AND HIGH ALTITUDE CONVERSIONS
Conversion: conversion of this unit must be performed by
qualified service personnel, using only approved parts.
High Altitude Application
High altitude application with this furnace can be field
performed by a simple adjustment of manifold pressure and
if necessary, a change of the orifices. The changes
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 Baffles.
Conversion of this furnace to utilize LP/Propane gas must
be made by qualified service personnel, using approved
parts. Conversion for the LP/Propane gas can be
accomplished by adjusting the manifold pressure, after
replacing the natural gas orifices with the appropriate LP/
Propane orifices shown in Table 6.
installations between zero and 5000 ft. above sea level, a
#54 drill size orifice should be used. However for installations
above 5000 ft. over sea level, a # 55 drill size orifice 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 903616
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.
CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
NOMINAL
BLACK IRON
PIPE DIAMETER
(in.)
10
20
1/2
130
90
3/4
280
190
1
520
350
1 1/4
1050
730
1 1/2
1600 1100
The cubic feet per hour listed in the table above must be greater than the
cubic feet per hour of gas flow required by the unit.
To determine the cubic feet per hour of gas flow required by the unit, divide
the input rate of the unit by the heating value of the gas:
Cubic Feet Per Hour Required
=
Table 4. Capacity of Black Iron Gas Pipe (cubic feet per
hour) for Natural Gas (specific gravity = .60).
Note: that for
LENGTH OF PIPE RUN
(feet)
30
40
50
60
70
75
65
55
50
45
150
130
115
105
95
285
245
215
195
180
590
500
440
400
370
890
760
670
610
560
Input To Unit (Btu/hr)
Heating Value of Gas (Btu/Cu. Ft.)
80
40
90
170
350
530
13
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