GMVC9 GCVC9 Installation Instructions

29
• 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.
• Connection method must be in compliance with all
local and national codes. US: National Fuel Gas Code
(NFGC) NFPA 54-2015/ANSI Z223.1-2015 and the
Installation Standards, Warm Air Heating and Air
Conditioning Systems ANSI/NFPA 90B
In Canada, CANADA: National Standard of Canada,
Natural Gas and Propane Installtion Code (NSCNGPIC)
CAN/CSA B149.1-15
• 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.
The gas piping may enter the left or right side of the fur-
nace cabinet. The installer must supply rigid pipe long enough
to reach the outside of the cabinet to seal the grommet cabinet
penetration. A semi-rigid connector to the gas piping can be
used outside the cabinet per local codes. 1/2” NPT pipe and
fittings are required. For models with an “L” shaped mani-
fold, a 4 1/2” long nipple is required. For models with a
hook shaped manifold, a 2” long nipple is required.
A semi-rigid connector to the gas piping can be used out-
side the cabinet per local codes. From the elbow, the length
of pipe and the fittings required will vary by the side cho-
sen, location of union and cabinet width. The union may be
placed inside or outside of the cabinet.
Alternate
Gas Line
Location
Gas Valve
Burners
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Drip Leg
Grommet
in Standard
Gas Line
Hole
*Ground
Joint
Pipe
Union
*Ground
Joint
Pipe
Union
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
Manifold
Figure 37
Alternate
Gas Line
Location
Plug in
Alternate
Gas Line
Hole
Gas Valve
Burners
Manual Shut Off Valve
(upstream from ground joint pipe union)
Drip Leg
Grommet
in Standard
Gas Line
Hole
*Ground
Joint
Pipe Union
*Ground
Joint
Pipe Union
*NOTE: Union may be inside furnace cabinet where allowed by local codes.
Figure 38
Drip Leg
Plug in Main Gas Line Hole
Alternate
Union
Location
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Gas
Valve
Burners
Drain Trap
Manifold
Plug in Alternate Gas Line Hole
Grommet in
Standard Gas Line Hole
Figure 39