Conversion; High Altitude Application; Natural Gas High Altitude Conversion; Lp/Propane Gas Sea Level And High Altitude Conversion - Nordyne G6RC 90+ Installation Instructions Manual

CAPACITY OF BLACK IRON GAS PIPE (CU. FT. PER HOUR)
FOR NATURAL GAS (SPECIFIC GRAVITY - 0.60)
NOMINAL
BLACK IRON
PIPE DIAMETER
(in.)
1/2
3/4
1
1 1/4
1 1/2
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 furnace. To determine the cubic feet per hour of gas flow required by the
furnace, divide the input rate of the furnace by the heating value of the gas:
Cubic Feet Per Hour Required
Table 6. Capacity of Black Iron Gas Pipe (cu. ft. per hour)
NOTE: When pressure testing gas supply lines
at pressures greater than 1/2 psig (14 in. water
column), the furnace 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 in. water column), the furnace must be
isolated from the gas supply line by closing the
manual shut-off valve.
! WARNING:
This furnace was equipped at the fac-
tory for use with natural gas only. A
special kit, supplied by the manufac-
turer, is required to convert the fur-
nace 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.

Conversion

Conversion of this furnace to use LP/propane
gas must be made 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 changing
the orifices. The changes required depend on
LENGTH OF PIPE RUN
10 20 30
130 90 75
280 190 150
520 350 285
1050 730 590
1600 1100 890
=
Heating Value of Gas (Btu/Cu. Ft.)
for Natural Gas (specific gravity = .60)
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 Tables 7 & 8 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 7.
LP/Propane Gas Sea Level and
High Altitude Conversion
Conversion of this furnace to utilize LP/propane
gas must be made by qualified service personnel,
using factory authorized or approved parts.
Conversion to LP/propane gas can be
accomplished by first replacing the natural gas
orifices with the appropriate LP/propane orifices
shown in Table 9 or 10. Note: for installations
between zero and 5000 ft. above sea level, a
#54 or #55 drill size orifice should be used
depending upon the rated firing rate of the unit
(see Table 9 or 10). However for installations
above 5000 ft. above sea level, a # 55 or #56 drill
size orifice should be used. After changing the
orifices, use Table 8 to determine the appropriate
manifold pressure for your installation.
(feet)
40 50 60 70
65 55 50 45
130 115 105 95
245 215 195 180
500 440 400 370
760 670 610 560
Input To Furnace (Btu/hr)
80
40
90
170
350
530
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