Gas Piping Checks; Propane Gas Tanks And Piping - Whirlpool Gold WGFD295 Installation Instructions Manual

80% 2-stage variable speed gas furnace
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Drip leg
Manual shutoff valve
Transition piece from ¹⁄₂" to another pipe size, if needed
When the gas piping enters through the left side of the furnace,
the installer must supply the following fittings (starting from the
gas control valve):
Straight pipe to reach the exterior of the furnace
Ground joint union
Drip leg
Manual shutoff valve
Transition piece from ¹⁄₂" to another pipe size, if needed
Counterflow Installations
When the gas piping enters through the left side of the furnace,
the installer must supply the following fittings (starting from the
gas control valve):
Straight pipe to reach the exterior of the furnace
Ground joint union
Drip leg
Manual shutoff valve
Transition piece from ¹⁄₂" to another pipe size, if needed
When the gas piping enters through the right side of the furnace,
the installer must supply the following fittings (starting from the
gas control valve):
90º elbows (2)
Close nipple
Straight pipe to reach the exterior of the furnace

Gas Piping Checks

Before placing the furnace in operation, leak test the furnace and
gas connections.
WARNING
Goodman 63
To avoid the possibility of explosion or fire, never use a
match or open flame to test for leaks.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other
approved testing methods.
WARNING
Goodman 72
To prevent property damage or personal injury due to
fire, the following instructions must be performed
regarding gas connections, pressure testing, location
of shutoff valve and installation of gas piping.
NOTES:
Never exceed specified pressures for testing. Higher pressure
may damage the gas control valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and external manual shutoff valve from
the gas supply piping system before pressure testing the
supply piping system with pressures in excess of ¹⁄₂ psig
(3.48 kPa).
Isolate this unit from the gas supply piping system by closing
the external manual shutoff valve before pressure testing
supply piping system with test pressures equal to or less than
¹⁄₂ psig (3.48 kPa).

Propane Gas Tanks and Piping

WARNING
If the gas furnace is installed in a basement, and
excavated area or a confined space, it is strongly
recommended to contact a propane supplier to install a
gas detecting warning device in case of a gas leak.
Since propane gas is heavier than air, any leaking can
settle in low areas or confined spaces.
Propane gas odorant may fade, making the gas
undetectable except with a warning device.
A gas detecting warning system is the only reliable way to detect
a propane gas leak. Rust can reduce the level of odorant in
propane gas. Do not rely on your sense of smell. Contact a local
propane gas supplier about installing a gas detecting warning
system.
NOTE: If a gas odor is detected, follow the instructions in "Gas
Furnace Safety Precautions" in this manual.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be
10.0" W.C. at the furnace manifold with all gas appliances in
operation.
Maintaining proper gas pressure depends on 3 main factors:
Vaporization rate, depending on temperature of the liquid and
"wetted surface" area of the container or containers.
Proper pressure regulation. 2-stage regulation is
recommended for both cost and efficiency.
Pressure drop in the lines between the regulators, and
between 2
nd
stage regulator and the appliance. Pipe size will
depend on the length of the pipe run and the total load of all
appliances.
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must be
used. Shellac-based compounds resistant to the actions of
liquefied petroleum gases, such as Gasolac
®
or John Crane
are satisfactory.
Refer to "Propane Gas Installation—Typical" for typical propane
gas installations and piping.
Propane Gas Installation—Typical
A
B
C
A. 1
st
stage regulator
B. 5 to 15 psig (20 psig maximum)
C. 200 psig maximum
Goodman 64
®
, Stalactic
®
, Clyde's
D
E
D. 2
nd
stage regulator
E. Continuous 11.0" W.C.
19
®

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