Goodman GMS9 Installation Instructions Manual page 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.
GAS VALVE
MANIFOLD BURNERS
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
GROUND JOINT
PIPE UNION
UPFLOW
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUN D
JOINT PIPE UNION)
GROU ND JOINT
PIPE UNION
DRIP LEG
GROMMET IN STANDARD
GAS VALVE
GAS LINE HOLE
BURNERS
DRAIN TRAP
PLUG IN ALTERNATE
MANIFOLD
GAS LINE HOLE
ALTERNATE GAS
LINE LOC ATION
HORIZONTAL [UPFLOW MODEL]
NOTES 1. WHEN GAS LINE IS IN THE ALTERNATE
:
LOCATION SWAP THE POSITION OF
,
THE PLUG AND GROMMET
Gas Piping Connections
E
DGES OF SHEET METAL HOLES MAY BE SHARP.
PRECAUTION WHEN REMOVING HOLE PLUGS.
D /S I
IRECT TANDARD NLET
When gas piping enters directly to the gas valve through the stan-
dard inlet hole, the installer must supply straight pipe with a ground
joint union to reach the exterior of the furnace. The rigid pipe must
be long enough to reach the outside of the cabinet to seal the grom-
met cabinet penetration. A semi-rigid connector to the gas piping
can be used outside the cabinet per local codes.
I /A I
NDIRECT LTERNATE NLET
When gas piping enters indirectly to the gas valve through the alter-
nate gas inlet hole the following fittings (starting from the gas valve)
to reach the outside of the cabinet must be supplied:
•
Coupling.
•
90 degree elbow.
•
2 inch close nipple.
•
90 degree elbow.
•
Straight pipe, with a ground joint union, to reach the exterior
of the furnace. The rigid pipe must be long enough to reach
the outside of the cabinet so as to seal the grommet cabinet
penetration. A semi-rigid connector to the gas piping can be
used outside the cabinet per local codes.
G P C
AS IPING HECKS
Before placing unit in operation, leak test the unit and gas connec-
tions.
24
MANUAL
SHUT OFF VALVE
(UPSTREAM FRO M
MANUAL
GROUND JOINT
SHUT OFF VALVE
PIPE UNION)
(UPSTREAM FROM
GROUND JOINT
PIPE UNION)
HEIGHT REQ UIRED
BY LOCAL CODE
HEIGHT REQUIRED
BY LOCAL CODE
GROMMET
IN STANDARD
GAS LINE HOLE
GROMMET
IN STANDARD
GAS LINE HOLE
DRIP LEG
DRIP LEG
GROUND JOINT
PIPE UNION
COUNTERFLOW
GROUND JOINT
PIPE UNION
GAS VALVE
BURNERS
MANIFOLD
ALTERNATE
GAS LINE LOCATION
HORIZONTAL[COUNTERFLOW]
2. DRIP LEG MAY TERMINATE WITH
A 1/2" X 1/8" PIPE PLUG TO
ACCOMMODATE LINE GAS
.
PRESSURE MEASUREMENT.
CAUTION
U
SE GLOVES AS A
P
IPING
P
IPING
ALTERNATE
GAS LINE
LOCATION
PLUG IN
ALTERNATE
GAS LINE
HOLE
GAS VALVE
MANIFOLD
B URNERS
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
DRAIN TRAP
PLUG IN ALTERNATE
GAS LINE HOLE