13
LEGEND
*
Field supplied.
NOTE: Follow all local codes.
NFGC – National Fuel Gas Code
STEEL PIPE
NOMINAL DIAMETER
(in.)
SPACINGOFSUPPORTS
X DIMENSION
(ft)
1
/
2
3
/
4
or 1
1
1
/
4
or larger
6
8
10
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
C11091
Fig. 15 -- Gas Piping Guide
(with Accessory Thru--the--Curb Service Connections)
Factory--Option Thru--Base Connections
(Gas Connections)—
This service connection kit consists of a
1
/
2
-- i n N P T g a s
adapter fitting (brass), a
1
/
2
--in electrical bulkhead
connector and a
3
/
4
--in electrical bulkhead connector, all
factory--installed in the embossed (raised) section of the
unit basepan in the condenser section.
LOW VOLTAGE
CONDUIT
CONNECTOR
BRASS FITTING FOR 3 TO 6 TON UNITS.
STAINLESS STEEL FITTING FOR 7 1/2 TO 12 1/2 TON.
HIGH VOLTAGE
CONDUIT
CONNECTOR
C08015
Fig. 16 -- 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
/
2
--in NPT street elbow on the thru--base gas
fitting. Attach a
1
/
2
--in pipe nipple with minimum length
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. 17.
EMBOSSMENT
BRASS FITTING
FOR 3-6 TON UNITS
SUPPORT
BRACKET
C08016
Fig. 17 -- Gas Line Piping for 3 to 6 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 Figures 18 and 19 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.
9” (229mm) min
Union
Shut Off
Valve
Drip
Leg
Thru-Curb Adapter
Unit Base Rail
C07469
Fig. 18 -- Gas Piping
48HC
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