Lennox International Inc G24-200 installation instructions Gas Piping

Gas Piping

NOTE − The flexible connector supplied with the unit must not be modified and must be installed between the two combination gas controls.

1 − Piping can be installed to enter either side of cabinet. Refer to figure 13.

Left-Side Installation − Install flexible connector (supplied with unit) between gas valves and connect supply piping as shown.

Right-Side Installation −

a − Remove tee and 1/2 in. NPTx1/2 in. male brass fitting from left side gas valve.

b − Remove 1/2 in. elbow and nipple from right side gas valve and re-install on left side gas valve fac- ing toward right side cabinet entry.

c − Re-install tee and 1/2 in. NPTx1/2 in. male brass fitting on right side gas valve with 3/4 in. side of tee facing the right side cabinet entry.

d − Install flexible connector (supplied with unit) be- tween gas valves and connect supply piping as shown.

NOTE − Flexible gas connector must be routed so that connector does NOT come in contact or interfere with any wiring.

2 − When connecting the gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. Table 9 lists recommended pipe sizes for typical ap- plications.

3 − The gas piping must not run in or through air ducts, clothes chutes, gas vents or chimneys, dumbwaiters or elevator shafts.

4 − The piping should be sloped 1/4 inch (6.4 mm) per 15 feet (4.57 m) upward toward the meter from the fur- nace. The piping must be supported at proper inter- vals [every 8 to 10 feet (2.44 to 3.01 m) using suitable hangers or straps. A drip leg should be installed in ver- tical pipe runs to the unit.

5 − In some localities, codes may require installation of a manual main shut-off valve and union (furnished by the installer) external to the unit. Union must be of the ground joint type.

6 − A 1/8" N.P.T. plugged tap is located on gas valve for test gauge connection. See figure 20 for tap location.

IMPORTANT

Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro- leum gases.

LEFT SIDE GAS LINE INSTALLATION

MANUAL MAIN SHUT-OFF VALVE		FLEXIBLE CONNECTOR
		SHIPPED WITH UNIT
	1/2 in. NPT X 1/2 in. MALE	AND FIELD INSTALLED
	BRASS FITTING
	(Provided with flex connector)	1/2 in. STREET
	TEE
		ELBOW
	(3/4 in. X 1/2 in. X 1/2 in.)

	AUTOMATIC GAS VALVE
DRIP LEG	(WITH MANUAL SHUT-OFF VALVE)

GROUND JOINT UNION

FIELD PROVIDED AND

INSTALLED

RIGHT SIDE GAS LINE INSTALLATION

(See item # 1 on previous page for installation instructions)

FLEXIBLE CONNECTOR			MANUAL MAIN SHUT-OFF VALVE
SHIPPED WITH UNIT
AND FIELD INSTALLED
	1/2 in. NPT X 1/2 in. MALE				TEE
		BRASS FITTING
				(3/4 in. X 1/2 in. X 1/2in. )
		(Provided with
1/2 in. STREET		flex connector)
ELBOW

	AUTOMATIC GAS VALVE		DRIP LEG
(WITH MANUAL SHUT-OFF VALVE)
			GROUND JOINT UNION
		FIELD PROVIDED AND
		INSTALLED

FIGURE 13

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