Carrier WeatherExpert 48LC B14 Series, Руководство по установке

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(610 m) and/or for use with liquefied petroleum (LP) fuel. See ac-
cessory 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. The input rating for altitudes
above 2000 ft (610 m) must be derated by 4% for each 1000 ft
(305 m) above sea level.
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 3 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. 32).
Pipe gas supply into 90 degree elbow (item 15 in Table 3) 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 3 and pipe gas supply into TEE. See
Fig. 33.
Fig. 32 — Gas Supply Line Piping with Thru-Base
Fig. 33 — Gas Supply Line Piping
For natural gas (NG) applications, gas pressure at unit gas con-
nection must not be less than 5 in. wg (1246 Pa) or greater than
13 in. wg (3240 Pa) while the unit is operating (see Table 4).
For liquified petroleum (LP) 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 (see Table 5).
Manifold pressure is factory-adjusted for NG fuel use. Adjust
as required to obtain best flame characteristics. See Table 6.
Manifold pressure for LP fuel must be adjusted to specified range
(see Table 7). Follow instructions in the accessory kit to make ini-
tial readjustment.
Table 3 — 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
-in. long nipple
13 1 NIBCOR Ball Valve (GB30)
14 1 8 Inch Long Nipple
15 1 90 Deg Elbow
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Table 4 — Natural Gas Supply Line Pressure Ranges
UNIT UNIT SIZE MIN MAX
48LC*B
14, 17, 20, 24, 26
5.0 in. wg
(1246 Pa)
13.0 in. wg
(3240 Pa)
Table 5 — Liquid Propane Supply Line Pressure
Ranges
UNIT UNIT SIZE MIN MAX
48LC*B
14, 17, 20, 24, 26
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
Table 6 — Natural Gas Manifold Pressure Ranges
UNIT UNIT SIZE HIGH FIRE LOW FIRE
48LC*B
14, 17, 20, 24, 26
3.0 in. wg
(747 Pa)
2.0 in. wg
(498 Pa)
Table 7 — Liquid Propane Manifold Pressure Ranges
UNIT UNIT SIZE HIGH FIRE LOW FIRE
48LC*B
14, 17, 20, 24, 26
11.0 in. wg
(2740 Pa)
7.3 in. wg
(1818 Pa)
48LCSB
14 only
9.8 in. wg
(2441 Pa)
6.5 in. wg
(1619 Pa)
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment damage.
When connecting the gas line to the unit gas valve, the installer
MUST use a backup wrench to prevent damage to the valve.
13
12
11
10
9
8
7
6
5
4
3
2
1