23
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
to the
3
/
4
in. FPT gas inlet port on the unit gas valve.
Table 2 lists typical
3
/
4
inch NPT (National Pipe Thread)
field supplied pipe fittings required for Thru--Base gas
supply, starting from the unit gas valve (see Fig. 18).
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
C10999
Fig. 18 -- Gas Supply Line Piping with Thru--Base
Table 2 – Typical
3
/
4
--in. NPT Field Supplied Piping Parts
Item
Qty
Description
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
12
1
3
1
/
2
Inch Long Nipple
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.
For typical
3
/
4
inch NPT field supplied fittings required
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.
13
12
11
10
9
8
7
6
5
4
3
2
1
C101006
Fig. 19 -- Gas Supply Line Piping
Table 3 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
MIN
MAX
48LC**
14, 17, 20, 24, 26
5.0 in. wg
(1246 Pa)
13.0 in. wg
(3240 Pa)
Table 4 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL
UNIT SIZE
MIN
MAX
48LC**
14, 17, 20, 24, 26
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
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
HIGH FIRE
LOW FIRE
48LC**
14, 17, 20, 24, 26
3.0 in. wg
(747 Pa)
2.0 in. Wg
(498 Pa)
* NIBCO is a registered trademark of NIBCO Inc.
Summary of Contents for WeatherExpert 48LC
Page 5: ...5 C13057 Fig 2 Unit Dimensional Drawing 14 Size Unit Sheet 1 of 3 ...
Page 6: ...6 C13058 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 2 of 3 ...
Page 7: ...7 C13059 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 3 of 3 ...
Page 8: ...8 C13032 Fig 3 Unit Dimensional Drawing 17 and 20 Size Units Sheet 1 of 3 ...
Page 9: ...9 C13033 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 2 of 3 ...
Page 10: ...10 C13034 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 3 of 3 ...
Page 11: ...11 C14106 Fig 4 Unit Dimensional Drawing 24 and 26 Size Units Sheet 1 of 3 ...
Page 12: ...12 C14107 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 2 of 3 ...
Page 13: ...13 C14108 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 3 of 3 ...
Page 17: ...17 C13054 Fig 8 Roof Curb Details 14 Size Unit ...
Page 18: ...18 C13055 Fig 9 Roof Curb Details 17 and 20 Size Units ...
Page 19: ...19 C13056 Fig 10 Roof Curb Details 24 and 26 Size Units ...
Page 27: ...27 a48 9336 Fig 26 48LC 14 26 Electro mechanical Control Wiring Diagram ...
Page 28: ...28 a48 9337 Fig 27 48LC 14 26 RTU Open Control Wiring Diagram ...
Page 29: ...29 a48 9338 Fig 28 48LC 14 26 SystemVut Control Wiring Diagram ...
Page 31: ...31 a48 9339 Fig 30 Typical Power Wiring Diagram SystemVut Controls 48LC 26 208 230V Shown ...
Page 58: ...58 a48 9340 Fig 55 Typical EconoMi erR X Wiring Diagram ...