Factory-Option Thru-Base Connections (Gas Connections) - Carrier WeatherMaker 48KC Series Installation Instructions Manual

9" MINIMUM CLEARANCE
FOR PANEL REMOVAL
MANUAL GAS
SHUTOFF VALVE
BASE UNIT
48" MINIMUM
BASE RAIL
ROOF
CURB
FROM
GAS
METER
LEGEND
National Fuel Gas
NFGC —
Code
STEEL PIPE NOMINAL
DIAMETERS (IN.)
1 /
2
3
/ or 1
4
1
1- / or larger
4
Fig. 17 — 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), a /
1
2
and a 3 / -in. electrical bulkhead connector, all factory-in-
4
stalled in the embossed (raised) section of the unit basepan in
the condenser section. See Fig. 18.
BRASS FITTING FOR 3 TO 6 TON UNITS.
Fig. 18 — Thru-Base Gas 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.
Install a 1 / -in. NPT street elbow on the thru-base gas fit-
2
ting. Attach a 1 / -in. pipe nipple with minimum length of
2
16-in. (406 mm) (field-supplied) to the street elbow and ex-
tend it through the access panel at the gas support bracket.
See Fig. 19.
X
GAS
REGULATOR *
*
DRIP LEG
PER NFGC *
FIELD-FABRICATED
*
SUPPORT
*Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
X DIMENSION (FT.)
6
8
10
1 / -in. NPT gas
2
-in. electrical bulkhead connector
LOW VOLTAGE
CONDUIT
CONNECTOR
HIGH VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING
EMBOSSMENT
FOR 3-6 TON UNITS
Fig. 19 — Gas Line Piping for 3 to 5 Ton Units Only
Other hardware required to complete the installation of the
gas supply line includes 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 man-
ual shutoff valve be located upstream of the sediment trap.
See Fig. 20 and 21 for typical piping arrangements for gas
piping that has been routed through the sidewall of the curb.
See Fig. 20 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.
THRU-CURB ADAPTER
SHUT OFF
VALVE
Fig. 20 — Gas Piping, Typical Curb Sidewall Piping
14
SUPPORT
BRACKET
9" (229mm) MIN
UNION
UNIT BASE R
DRIP
LEG
(Example 1)