Carrier WeatherExpert 48LC 04 Series Installation Instructions Manual page 16

HIGH VOLTAGE
CONDUIT
CONNECTOR
AUXILIARY
POWER
SUPPLY
(OPTIONAL)
Fig. 21 — 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.
Install a 1 / -in. NPT street elbow on the thru-base gas fitting.
2
Attach a / -in. pipe nipple with minimum length of 16-in.
1
2
(406 mm) (field-supplied) to the street elbow and extend it
through the access panel at the gas support bracket. See
Fig. 22.
BRASS FITTING
EMBOSSMENT
FOR GAS PIPING
Fig. 22 — Gas Line Piping for 3 to 5 Ton Units Only
Other hardware required to complete the installation of the gas
supply line will include a manual shutoff valve, a sediment trap
(drip leg) and a ground-joint union. A pressure regulator valve
may also be required (to convert gas pressure from pounds to
inches of pressure). The manual shutoff valve must be located
within 6 ft (1.83 m) of the unit. The union, located in the final
leg entering the unit, must be located at least 9-in. (230 mm)
away from the access panel to permit the panel to be removed
for service. If a regulator valve is installed, it must be located a
minimum of 4 ft (1220 mm) away from the unit's flue outlet.
Some municipal codes require that the manual shutoff valve be
located upstream of the sediment trap. See Fig. 23 and 24 for
typical piping arrangements for gas piping that has been routed
through the sidewall of the curb. See Fig. 25 for typical piping
arrangement when thru-base is used. Ensure that all piping
does not block access to the unit's main control box or limit the
required working space in front of the control box.
BRASS FITTING FOR
3 TO 6 TON UNITS
THRU-CURB ADAPTER
LOW VOLTAGE
CONDUIT
CONNECTOR
SUPPORT
BRACKET
16
9" (229mm) MIN
SHUT OFF
VALVE
DRIP
LEG
Fig. 23 — Gas Piping
BURNER
ACCESS
PANEL
THRU-CURB ADAPTER
SHUT OFF
VALVE
Fig. 24 — Gas Piping
Fig. 25 — Gas Piping Thru-Base Connections
UNION
UNIT BASE RAIL
9" (229 mm) MIN
UNION
UNIT BASE RAIL
DRIP
LEG