Amana GUI Installation Instructions Manual page 14

Connecting Gas Piping - Natural Gas
Refer to Figure 11 for the general layout at the furnace.
The following rules apply:
1. Use black iron or steel pipe and fittings for the building
piping.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4. 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.
5. Use two pipe wrenches when making connection to
the gas valve to keep it from turning. The orientation
of the gas valve on the manifold must be the same as
shipped from the factory.
6. Within six feet of the unit, install a manual shutoff
valve between the meter and the unit. If a union is
installed, the union must be downstream of the
manual shutoff valve, between the shutoff valve and
the furnace.
7. Tighten all joints securely.
8. The furnace must be connected to the building piping
by one of the following:
•
Rigid metallic pipe and fittings.
•
Semirigid metallic tubing and metallic fittings. Alu-
minum alloy tubing must not be used in exterior
locations.
•
Listed gas appliance connectors, used in accor-
dance with the terms of their listing, must be
completely in the same room as the furnace.
•
The connectors or semirigid tubing must be pro-
tected against physical and thermal damage when
installed. Aluminum-alloy tubing and connectors
must be coated to protect against external corro-
sion when in contact with masonry, plaster or
insulation or are subject to repeated wettings by
such liquids as water (except rain water), deter-
gents or sewage.
Figure 11
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 elbow
• Close nipple
• 90 degree elbow
• Straight pipe to reach the exterior of the furnace.
(Figures 12 & 13)
Gas Inlet Through Furnace Right Side
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.
Gas Inlet Through Furnace Bottom Side
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.
(Figures 14 & 15)
•
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 tran-
sition piece from 1/2 inch to another pipe size.
14
Figure12
Figure13
(Upflow)