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HIGH VOLTAGE
CONDUIT
CONNECTOR
AUXILIARY
POWER
SUPPLY
(OPTIONAL)
Fig. 17 — 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 fitting.
2
Attach a
/
-in. pipe nipple with minimum length of 16-in. (406
1
2
mm) (field-supplied) to the street elbow and extend it through
the access panel at the gas support bracket. See Fig. 18.
BRASS FITTING
EMBOSSMENT
FOR GAS PIPING
Fig. 18 — Gas Line Piping for 3 to 6 Ton Units
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 manual shutoff
valve be located upstream of the sediment trap. See Fig. 19 and
20 for typical piping arrangements for gas piping that has been
routed through the sidewall of the curb. See Fig. 21 for typical
piping arrangement when thru-base is used. Ensure that all pip-
ing 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
LOW VOLTAGE
CONDUIT
CONNECTOR
SUPPORT
BRACKET
14
9" (229mm) min
Thru-Curb Adapter
Shut Off
Valve
Drip
Leg
Fig. 19 — Gas Piping, Typical Curb Sidewall Piping
(Example 1)
Burner
Access
Panel
Thru-Curb Adapter
Shut Off
Valve
Fig. 20 — Gas Piping, Typical Curb Sidewall Piping
(Example 2)
Fig. 21 — Gas Piping, Typical Thru-Base Connections
Union
Unit Base Rail
9" (229mm) min
Union
Unit Base Rail
Drip
Leg
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