Factory Option Thru-Base Connections - Carrier WeatherExpert 48JC04 Installation Instructions Manual

Table 3 — Natural Gas Supply Line Pressure Ranges
UNIT MODEL
48JC
Table 4 — Liquid Propane Supply Line Pressure
Ranges
UNIT MODEL
48JC
The gas supply pipe enters the unit at the burner access panel
on the front side of the unit, through the long slot at the bottom
of the access panel. The gas connection to the unit is made to
the / -in. FPT gas inlet port on the unit gas valve.
1
2
Manifold pressure is factory-adjusted for natural gas fuel use.
Adjust as required to obtain best flame characteristics. See
Table 5.
Table 5 — Natural Gas Manifold Pressure Ranges
UNIT MODEL
48JC
Manifold pressure for LP fuel use must be adjusted to specified
range. Follow instructions in the accessory kit to make initial
readjustment, see Table 6.
Table 6 — Liquid Propane Manifold Pressure Ranges
UNIT MODEL
48JC
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution may result in equipment dam-
age.
When connecting the gas line to the unit gas valve, the in-
staller MUST use a backup wrench to prevent damage to
the valve.
Install a gas supply line that runs to the unit heating section.
Refer to the NFPA 54/NFGC or equivalent code for gas pipe
sizing data. Do not use a pipe size smaller than
gas supply line to allow for a maximum pressure drop of
UNIT SIZE MIN. MAX.
4.0 in. wg 13.0 in. wg
04, 05, 06
(996 Pa) (3240 Pa)
UNIT SIZE MIN.
11.0 in. wg 13.0 in. wg
04, 05, 06
(2740 Pa) (3240 Pa)
UNIT SIZE HIGH FIRE LOW FIRE
3.5 in. wg 1.7 in. wg
04, 05, 06
(872 Pa) (423 Pa)
UNIT SIZE HIGH FIRE LOW FIRE
10 in. wg 5 in. wg
04, 05, 06
(2490 Pa) (1245 Pa)
/ -in. Size the
1
2
0.5 in. wg (124 Pa) between gas regulator source and unit gas
valve connection when unit is operating at high-fire flow rate.
The gas supply line can approach the unit in three ways: hori-
zontally from outside the unit (across the roof), thru-curb/under
unit basepan (accessory kit required), or through unit basepan
(factory option or accessory kit required). Consult accessory
kit installation instructions for details on these installation
methods. Observe clearance to gas line components per
Fig. 16.
MAX.
BASE UNIT
BASE RAIL
FROM
GAS
METER
LEGEND
NFGC — National Fuel Gas
Code
STEEL PIPE
NOMINAL DIAMETERS (IN.)
1 1
(with Accessory Thru-the-Curb Service Connections)
FACTORY OPTION THRU-BASE CONNECTIONS (GAS
CONNECTIONS)
This service connection kit consists of a
connector and a
an "L" bracket covering the embossed (raised) section of the unit
basepan in the condenser section (see Fig. 17 for shipping
position).
The / -in. bulkhead connector enables the low-voltage control
3
4
wires to pass through the basepan. The
allows the high-voltage power wires to pass through the basepan.
See Fig. 18.
13
X
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
48" MINIMUM
DRIP LEG
PER NFGC
ROOF
CURB
*Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
X DIMENSION (FT)
/
1
2
/ or 1
3
4
/ or larger
4
Fig. 16 — Gas Piping Guide
/
1
2
/ -in. electrical bulkhead connector, connected to
3
4
/ -in. bulkhead connector
1
2
GAS
REGULATOR *
*
*
FIELD-FABRICATED
*
SUPPORT
6
8
10
-in. electrical bulkhead