Lochinvar 500, 90 service manual Gas Piping, Install Piping to Control

Installation & Service Manual

3Gas connections

TABLE - 3E

MULTIPLE APPLIANCE INSTALLATIONS

GAS PIPING SIZE CHART

Nominal					Length of Pipe in Straight Feet										Maximum
Iron Pipe
Size															Capacity of Pipe
															in Thousands of
Inches
	10	20	30	40	50	60	70	80	90	100	125	150	175	200	Btu/hr per hour
															for gas pressures
3/4	369	256	205	174	155	141	128	121	113	106	95	86	79	74
															of 13.5 Inches
1	697	477	384	328	292	267	246	226	210	200	179	164	149	138	Water Column
															(0.5 PSIG) or less
1 1/4	1,400	974	789	677	595	543	502	472	441	410	369	333	308	287	and a pressure
															drop of 0.5 Inch
1 1/2	2,150	1,500	1,210	1,020	923	830	769	707	666	636	564	513	472	441	Water Column
															(Based on NAT
2	4,100	2,820	2,260	1,950	1,720	1,560	1,440	1,330	1,250	1,180	1,100	974	871	820
															GAS, 1025
															Btu/hr per Cubic
2 1/2	6,460	4,460	3,610	3,100	2,720	2,460	2,310	2,100	2,000	1,900	1,700	1,540	1,400	1,300
															Foot of Gas and
															0.60 Specific
3	11,200	7,900	6,400	5,400	4,870	4,410	4,000	3,800	3,540	3,300	3,000	2,720	2,500	2,340
															Gravity)
4	23,500	16,100	13,100	11,100	10,000	9,000	8,300	7,690	7,380	6,870	6,150	5,640	5,130	4,720

Gas Piping

TRAP ( DRIP LEG )

GAS VALVE

GAS SHUTOFF

UNION

2.	Use new, properly threaded black iron pipe free from chips.
	If tubing is used, make sure the ends are cut squared,
	deburred and clean. All tubing bends must be smooth and
	without deformation. Avoid flexible gas connections.
	Internal diameter of flexible lines may not provide proper
	volume of gas.
3.	Run pipe or tubing to the gas valve or manifold inlet. If
	tubing is used, obtain a tube to pipe coupling to connect
	the tubing to the gas valve or manifold inlet.
4.	DO NOT OVER TIGHTEN. Over tightening may result in
	damage to the gas valves. Valve distortion or malfunction
	may result if the pipe is inserted too deeply into the gas
	valve.
5.	Apply a moderate amount of good quality pipe compound
	(DO NOT use Teflon tape) to pipe only, leaving two end
	threads bare.

Figure 3-1_Gas Line Connection

All gas connections must be made with pipe joint compound resistant to the action of liquefied petroleum and natural gas. All piping must comply with local codes. Tubing installations must comply with approved standards and practices. Reference FIG. 3-1 for a typical installation.

Install Piping to Control

1.The gas line should be a separate line direct from the meter unless the existing gas line is of sufficient capacity. Verify pipe size with your gas supplier.

6.	Remove seal over gas valve or manifold inlet.
7.	Connect pipe to gas valve or manifold inlet. Use wrench to
	square ends of the gas valve (FIG. 3-2).

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