24
•
Install a drip leg to trap dirt and moisture before it can enter
the gas valve. The drip leg must be a minimum of three
inches long.
•
Install a 1/8" NPT pipe plug fitting, accessible for test gage
connection, immediately upstream of the gas supply
connection to the furnace.
•
Always use a back-up wrench when making the connection
to the gas valve to keep it from turning. The orientation of
the gas valve on the manifold must be maintained as
shipped from the factory. Maximum torque for the gas valve
connection is 375 in-lbs; excessive over-tightening may
damage the gas valve.
•
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. In order to seal the grommet cabinet
penetration, rigid pipe must be used to reach the
outside of the cabinet. A semi-rigid connector to the
gas piping may be used from there.
•
Use listed gas appliance connectors in accordance with
their instructions. Connectors must be fully in the same
room as the furnace.
•
Protect connectors and semirigid 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.
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
GROMMET
IN STANDARD
GAS LINE HOLE
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
HEIGHT REQUIRED
BY LOCAL CODE
GROUND JOINT
PIPE UNION
DRIP LEG
MANIFOLD
BURNERS
GAS VALVE
HORIZONTAL [UPFLOW MODEL]
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
DRAIN TRAP
ALTERNATE GAS
LINE LOCATION
MANIFOLD
PLUG IN ALTERNATE
GAS LINE HOLE
GAS VALVE
GROUND JOINT
PIPE UNION
BURNERS
GROMMET
IN STANDARD
GAS LINE HOLE
*
*
*
*
COUNTERFLOW
MANUAL
SHUT OFF VALVE
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
HEIGHT REQUIRED
BY LOCAL CODE
GROUND JOINT
PIPE UNION
DRIP LEG
MANIFOLD
BURNER S
GAS VALVE
NOTES
:
1.
WHEN
GAS
LINE
IS
IN
THE
ALTERNATE
LOCATION
,
SWAP
THE
POSITION
OF
THE
PLUG
AND
GROMMET
.
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
DRAIN TRAP
ALTERNATE
GAS LINE LOCATION
MANIFOLD
PLUG IN ALTERNATE
GAS LINE HOLE
BURNERS
GAS VALVE
HORIZONTAL[COUNTERFLOW]
UPFLOW
GROUND JOINT
PIPE UNION
2. DRIP LEG MAY TERMINATE WITH
A 1/2" X 1/8" PIPE PLUG TO
ACCOMMODATE LINE GAS
PRESSURE MEASUREMENT.
Gas Piping Connections
HORIZONTAL [COUNTERFLOW MODEL]
