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Step 10 — Install Gas Piping
Installation of the gas piping must be in accordance with
local building codes and with applicable national codes.
In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel
Gas Code (NFGC). In Canada, installation must be
accordance with the CAN/CSA B149.1 and CAN/CSA
B149.2 installation codes for gas burning appliances.
This unit is factory equipped for use with Natural Gas fuel
at elevations up to 2000 ft (610 m) above sea level. Unit
may be field converted for operation at elevations above
2000 ft (610 m) and/or for use with liquefied petroleum
fuel. See accessory kit installation instructions regarding
these accessories.
NOTE:
Furnace gas input rate on rating plate is for
installation up to 2000 ft (610 m) above sea level. In
U.S.A. the input rating for altitudes above 2000 ft (610 m)
must be derated by 4% for each 1000 ft (305 m) above sea
level.
For natural gas applications, gas pressure at unit gas
connection must not be less than 5 in. wg (1246 Pa) or
greater than 13 in. wg (3240 Pa) while the unit is
operating. For liquified petroleum applications, the gas
pressure must not be less than 11 in. wg (2740 Pa) or
greater than 13 in. wg (3240 Pa) at the unit connection.
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
3
to the
/
in. FPT gas inlet port on the unit gas valve.
4
3
Table 2 lists typical
/
inch NPT (National Pipe Thread)
4
field supplied pipe fittings required for Thru- - Base gas
supply, starting from the unit gas valve (see Fig. 18).
5
6
7
8
9
10
11
12
13
14
Fig. 18 - - Gas Supply Line Piping with Thru- - Base
4
3
2
1
15
C10999
3
Table 2 – Typical
/
- - in. NPT Field Supplied Piping Parts
4
Item
Qty
1
1
90 Deg Street Elbow
2
1
5 Inch Long Nipple
3
1
Ground---Joint Union
4
1
3 Inch Long Nipple
5
1
90 Deg Elbow
6
1
12 Inch Long Nipple
7
1
90 Deg Elbow
8
1
3 Inch Long Nipple
9
1
TEE
10
1
4 Inch Long Nipple (Sediment Trap)
11
1
Cap
1
12
1
3
/
Inch Long Nipple
2
13
1
NIBCO* Ball Valve (GB30)
14
1
8 Inch Long Nipple
15
1
90 Deg Elbow
Pipe gas supply into 90 degree elbow item 15 (see Table 2)
through the hole in the unit basepan.
3
For typical
/
inch NPT field supplied fittings required
4
for NON Thru- - Base gas supply starting from the unit gas
valve, omit items 14 and 15 from Table 2 and pipe gas
supply into TEE. See Fig. 19.
5
6
7
8
9
12
10
13
11
Fig. 19 - - Gas Supply Line Piping
Table 3 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
48LC**
14, 17, 20, 24, 26
Table 4 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
48LC**
14, 17, 20, 24, 26
Manifold pressure is factory- - adjusted for natural gas (NG)
fuel use. Adjust as required to obtain best flame
characteristics.
Table 5 – Natural Gas Manifold Pressure Ranges
UNIT MODEL
UNIT SIZE
48LC**
14, 17, 20, 24, 26
* NIBCO is a registered trademark of NIBCO Inc.
23
Description
4
3
2
1
C101006
MIN
MAX
5.0 in. wg
13.0 in. wg
(1246 Pa)
(3240 Pa)
MIN
MAX
11.0 in. wg
13.0 in. wg
(2740 Pa)
(3240 Pa)
HIGH FIRE
LOW FIRE
3.0 in. wg
2.0 in. Wg
(747 Pa)
(498 Pa)
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