27
Fig. 30 — Gas Piping Guide
GAS SUPPLY LINE
The gas supply pipe enters the unit adjacent to the burner access
panel on the front side of the unit, through the grommeted hole.
The gas connection to the unit is made to the
3
/
4
-in. FPT gas inlet
port on the unit gas valve.
Table 7 lists typical
3
/
4
-in. NPT (National Pipe Thread) field sup-
plied pipe fittings required for Thru-Base gas supply, starting from
the unit gas valve (see Fig. 31).
Pipe gas supply into 90 degree elbow item 15 (see Table 7)
through the hole in the unit basepan.
For typical
3
/
4
-in. NPT field supplied fittings required for NON
Thru-Base gas supply starting from the unit gas valve, omit
items 14 and 15 from Table 7 and pipe gas supply into TEE. See
Fig. 32.
* NIBCO is a registered trademark of NIBCO Inc.
Fig. 31 — Gas Supply Line Piping with Thru-Base
Fig. 32 — Gas Supply Line Piping
FACTORY-OPTION THRU-BASE CONNECTIONS
Electrical Connections
Knockouts are located in the control box area. Remove the appro-
priate size knockout for high voltage connection. Use the field
supplied connector depending on wiring or conduit being utilized.
Remove the
7
/
8
-in. (22 mm) knockout and appropriate connector
for low voltage wiring. If non-unit powered convenience outlet is
being utilized, remove the
7
/
8
-in. (22 mm) knockout and utilize ap-
propriate connector for 115 volt line. See “Step 12 — Make Elec-
trical Connections” for details.
Gas Connections:
Remove the knockout in the base pan and route
3
/
4
-in. gas line up
through the opening. Install an elbow and route gas line through
opening in panel after first removing plastic bushing. Install a gas
shut off followed by a drip leg and ground-joint union. Route gas
line into gas section through the grommet (Part #: KA56SL112) at
the gas inlet and into the gas valve. See Fig. 31 and Table 7. If a
regulator is installed, it must be located 4 feet (1.22 meters) from
the flue outlet.
Some municipal codes require that the manual shutoff valve be lo-
cated upstream of the sediment trap. See Fig. 32 for typical piping
arrangements for gas piping that has been routed through the side-
wall of the base pan.
Table 7 — Typical
3
/
4
-in. NPT Field-Supplied Piping
Parts
ITEM QTY DESCRIPTION
1 1 90 degree Street Elbow
2 1 5-in. Long Nipple
3 1 Ground-Joint Union
4 1 3-in. Long Nipple
5 1 90 degree Elbow
6 1 12-in. Long Nipple
7 1 90 degree Elbow
8 1 3-in. Long Nipple
9 1TEE
10 1 4-in. Long Nipple (Sediment Trap)
11 1Cap
12 13
1
/
2
-in. Long Nipple
13 1 NIBCO* Ball Valve (GB30)
14 1 8-in. Long Nipple
15 1 90 degree Elbow
LEGEND
*
Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACING OF SUPPORTS
X DIMENSION
(ft)
1
/
2
3
/
4
or 1
1
1
/
4
or larger
6
8
10
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-
FABRICATED
SUPPORT
*
FROM
GAS
METE
To Next Page
Loading...
