Upflow Installations; Gas Piping Checks; Propane Gas Tanks And Piping - Goodman GMH8 Installation Instructions Manual

• 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:
-- Rigid metallic pipe and fittings.
-- Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in exterior
locations.
-- Use listed gas appliance connectors in accordance
with their instructions. Connectors must be fully in
the same room as the furnace.
Protect connectors and semi-rigid tubing against
physical and thermal damage when installed. Ensure
aluminum-alloy tubing and connectors are coated to
protect against external corrosion when in contact with
masonry, plaster, or insulation, or subjected to
repeated wetting by liquids such as water (except rain
water), detergents, or sewage.
Location of Manual VaIve
(InstaIled Ahead of ? t
Ground Joint Pipe Union)
Height Required
By Local Code
Ground Joint Pipe Union
To Be installed Ahead of n\
Gas Valve
Drip Leg -'.
Reducing Coupling
_
1/2" x 1/8" with 1/8"
Pipe Plug To Measure
Line Gas Pressure
General Furnace Layout
UPFLOW INSTALLATIONS
When the gas piping enters through the right side of the furnace,
the installer must supply the following fittings (starting from the
gas valve):
• 90 degree elbows (2).
• Close nipple.
• Straight pipe to reach the exterior of the furnace.
A ground joint union, drip leg, and manual shutoff valve must also
be supplied by the installer, in some cases, the installer may also
need to supply a transition piece from 1/2" to another pipe size.
When the gas piping enters through the left side of the furnace,
the installer must supply the following fittings (starting from the
gas valve):
• Straight pipe to reach the exterior of the furnace.
• A ground joint union, drip leg, and manual shutoff valve
must also be supplied by the installer. In some cases, the
installer may also need to supply a transition piece from 1/
2 inch to another pipe size.
COUNTERFLOW INSTALLATIONS
When the gas piping enters through the left side of the furnace,
the installer must supply a straight pipe to reach the exterior of the
furnace.
A ground joint union, drip leg, and manual shutoff valve must also
be supplied by the installer, in some cases, the installer may also
need to supply a transition piece from 1/2" to another pipe size.
When the gas piping enters through the right side of the furnace,
the installer must supply the following fittings (starting at the gas
valve):
• 90 degree elbow.
• Close nipple.
• 90 degree elbow.
• Straight pipe to reach exterior of furnace.
GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas
connections,
,_ WARNING I
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.
_kCAUTION
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.
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and 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).
This unit must be isolated from the gas supply system by closing
its manual shutoff valve before pressure testing of gas supply
piping system with test pressures equal to or less than 1/2 psig
(3.48 kPa).
PROPANE GAS TANKS AND PIPING
_II, WARNIN G
IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED
AREA OR A CONFINED SPACE, IT IS STRONGLY RECOMMENDEDTO
CONTACT A PROPANE SUPPLIER TO INSTALL A GAB DETECTING
WARNING DEVICE IN CASE OF A GAB LEAK.
• SINCE PROPANE GAS IS HEAVIER THAN AIR, ANY LEAKING GAS CAN
SETTLE IN ANY LOW AREAS OR CONFINED SPACES.
• PROPANE GAS ODORANT MAY FADE, MAKING THE GAS UNDETECTABLE
EXCEPT WITH A WARNING DEVICE.
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