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BRASS FITTING
EMBOSSMENT
FOR 3-6 TON UNITS
Fig. 16 - - Gas Line Piping for 6 Ton Units
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. 17
and 18 for typical piping arrangements for gas piping that
has been routed through the sidewall of the curb. See Fig. 19
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
Drip
Leg
Fig. 17 - - Gas Piping with Direct Drip Leg
SUPPORT
BRACKET
9" (229mm) min
Union
Unit Base Rail
Burner
Access
Panel
Thru-Curb Adapter
C13411
Fig. 18 - - Gas Piping with Offset Drip Leg
Fig. 19 - - Gas Piping Thru- - Base Connections
When installing the gas supply line, observe local codes
pertaining to gas pipe installations. Refer to the NFPA
54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA
B149.1). In the absence of local building codes, adhere to
the following pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe
1
/4- - in. in every 15 ft (7 mm in every 5 m) to prevent
traps. Grade all horizontal runs downward to risers.
Use risers to connect to heating section and to meter.
2. Protect all segments of piping system against physical
and thermal damage. Support all piping with appro-
priate straps, hangers, etc. Use a minimum of one
hanger every 6 ft (1.8 m). For pipe sizes larger than
1
/
- - in., follow recommendations of national codes.
C07469
2
3. Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections.
Use only pipe dope that is resistant to action of lique-
fied petroleum gases as specified by local and/or nation-
al codes. If using PTFE (Teflon*) tape, ensure the mate-
rial is Double Density type and is labeled for use on gas
lines. Apply tape per manufacturer's instructions.
15
9" (229mm) min
Union
Unit Base Rail
Drip
Leg
Shut Off
Valve
* Teflon is a registered trademark of DuPont.
C07470
C08018
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