17
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 (Figures 16 and 17) the installer must supply the
straight pipe to reach the exterior of the furnace.
Figure 16
Gas Inlet Through Furnace Right Side
(Except GUD)
Figure 17
Gas Inlet Through Furnace Right Side
(GUD Only)
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.
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 14
When the gas piping enters through the left side of the
furnace (Figure 15), the installer must supply the follow-
ing fittings (starting from the gas valve):
90 degree elbow
1-1/2 inch close nipple
90 degree elbow
Straight pipe to reach exterior of furnace
Figure 15
Gas Inlet Through Furnace Left Side
(Except GUD)
