Factory- - Option Thru- - Base Connections (Gas Connections) - Carrier WeatherExpert 48LC Installation Instructions Manual

Table 2 – Natural Gas Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE
48LCD/E/S/R0 07
48LCF/T0
07
(High Heat units only)
Table 3 – Liquid Propane Supply Line Pressure Ranges
UNIT MODEL UNIT SIZE
48LCD/F/E/S/R/T0 07
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
3
unit is made to the / - - in. FPT gas inlet port on the unit
4
gas valve.
Manifold pressure is factory- - adjusted for natural gas (NG)
fuel use. Adjust as required to obtain best flame
characteristics.
Table 4 – Natural Gas Manifold Pressure Ranges
UNIT MODEL UNIT SIZE
48LCD/E/S/R0 07
48LCF/T0
07
(High Heat units only)
Manifold pressure for liquid propane (LP) fuel use must
be adjusted to specified range. Follow instructions in the
accessory kit to make initial readjustment.
Table 5 – Liquid Propane Manifold Pressure Ranges
UNIT MODEL UNIT SIZE
48LCD/E/S/R0 07
48LCF/T0
07
(High Heat units only)
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage
to equipment.
When connecting the gas line to the unit gas valve,
the installer 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
1
than / - - in. Size the gas supply line to allow for a
2
maximum pressure drop of 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:
horizontally from outside the unit (across the roof),
thru- - curb/under unit basepan (accessory kit required) or
through unit basepan (factory- - option or accessory kit
MIN MAX
4.0 in. wg 13.0 in. wg
(996 Pa) (3240 Pa)
5.0 in. wg 13.0 in. Wg
(1245 Pa) (3240 Pa)
MIN MAX
11.0 in. wg 13.0 in. wg
(2740 Pa) (3240 Pa)
HIGH FIRE LOW FIRE
3.5 in. wg 1.7 in. wg
(872 Pa) (423 Pa)
3.5 in. wg 2.0 in. wg
(872 Pa) (498 Pa)
HIGH FIRE LOW FIRE
10.0 in. wg 5.0 in. wg
(2490 Pa) (1245 Pa)
10.0 in. wg 5.7 in. wg
(2490 Pa) (1420 Pa)
required). Consult accessory kit installation instructions
for details on these installation methods. Observe
clearance to gas line components per Fig. 14.
9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
BASE UNIT
BASE RAIL
ROOF
CURB
FROM
GAS
NFGC – National Fuel Gas Code
METER
Field supplied.
*
NOTE: Follow all local codes.
STEEL PIPE
NOMINAL DIAMETER
(in.)
1
/
2
3 /
or 1
4
1 /
1 or larger
4
Fig. 14 - - Gas Piping Guide
(with Accessory Thru- - the- - Curb Service Connections)
Factory- - Option Thru- - Base Connections
(Gas Connections) —
This service connection kit consists of a
adapter fitting (brass), two
3
connectors and a / - - in. electrical bulkhead connector, all
4
factory- - installed in the embossed (raised) section of the
unit basepan in the condenser section.
BRASS FITTING FOR 3 TO 6 TON UNITS.
Fig. 15 - - Fittings
The thru- - base gas connector has male and female threads.
The male threads protrude above the basepan of the unit;
the female threads protrude below the basepan.
Check tightness of connector lock nuts before connecting
gas piping.
3
Install a / - - in NPT street elbow on the thru- - base gas
4
3
fitting. Attach a / - - in. pipe nipple with minimum length
4
of 16- - in. (406 mm) (field- - supplied) to the street elbow
and extend it through the access panel at the gas support
bracket. See Fig. 16.
14
X
GAS
*
REGULATOR
MANUAL GAS
SHUTOFF VALVE *
48" MINIMUM
DRIP LEG
*
PER NFGC
FIELD-FABRICATED
*
SUPPORT
LEGEND
SPACING OF SUPPORTS
X DIMENSION
(ft)
6
8
10
3
/ - - in. NPT gas
4
1
/ - - in. electrical bulkhead
2
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
C11091
C13410