Carrier WeatherMaker 48TC 04, Руководство по установке

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Table 3 — Natural Gas Supply Line Pressure
Ranges
Table 4 — Liquid Propane Supply Line Pressure
Ranges
The gas supply pipe enters the unit at the burner access pan-
el on the front side of the unit, through the long slot at the bot-
tom of the access panel. The gas connection to the unit is made
to the 1 /
2
-in. FPT gas inlet port on the unit gas valve.
Manifold pressure is factory-adjusted for NG fuel use. Ad-
just as required to obtain best flame characteristics. See Table 5
for ranges.
Table 5 — Natural Gas Manifold Pressure Ranges
Manifold pressure for LP fuel use must be adjusted to spec-
ified range, see Table 6. Follow instructions in the accessory kit
to make initial readjustment.
Table 6 — Liquid Propane Manifold Pressure
Ranges
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 1 /
2
-in. Size the
gas supply line to allow for a 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 required). Consult ac-
cessory kit installation instructions for details on these installa-
tion methods. Observe clearance to gas line components per
Fig. 14.
Fig. 14 — Gas Piping Guide (with Accessory Thru-
the-Curb Service Connections)
FACTORY-OPTION THRU-BASE CONNECTIONS
(GAS CONNECTIONS) — This service connection kit con-
sists of a
1
/
2
-in. NPT gas adapter fitting (brass), a
1
/
2
-in. electri-
cal bulkhead connector and a 3 /
4
-in. electrical bulkhead con-
nector, all factory-installed in the embossed (raised) section of
the unit basepan in the condenser section. See Fig. 15.
Fig. 15 — Thru-Base Connection 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.
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.
Install a 1 /
2
-in. NPT street elbow on the thru-base gas fitting.
Attach a 1 /
2
-in. pipe nipple with minimum length of 16-in.
UNIT MODEL UNIT SIZE MIN. MAX.
48TCD/E/F 04, 05, 06, 07
4.0 in. wg
(996 Pa)
13.0 in. wg
(3240 Pa)
UNIT MODEL UNIT SIZE MIN. MAX.
48TCD/E/F 04, 05, 06, 07
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
UNIT MODEL UNIT SIZE
HIGH
FIRE.
LOW FIRE
48TCD/E/F 04, 05, 06, 07
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
UNIT MODEL UNIT SIZE
HIGH
FIRE.
LOW FIRE
48TCD/E/F 04, 05, 06, 07
11.0 in. wg
(2740 Pa)
13.0 in. wg
(3240 Pa)
CAUTION
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.
LEGEND
* Field-Supplied.
STEEL PIPE NOMINAL
DIAMETER (in.)
SPACING OF SUPPORTS X
DIMENSIONS (FT)
1 /
2
6
3
/
4
or 1 8
1
1 /
4
or larger 10
NFGC — National Fuel Gas Code
X
BASE UNIT
BASE RAIL
ROOF
CURB
9” MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
*
GAS
REGULATOR
*
48” MINIMUM
DRIP LEG
PER NFGC
*
FIELD-FABRICATED
SUPPORT
*
FROM
GAS
METER
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRA SS FITTING FOR 3 TO 6 TON UNIT S .