Goodman Mfg VC8 instruction manual Propane Gas Installation Typ

CIRCULATING AIR AND FILTERS

PROPANE GAS TANKS AND PIPING

WARNING

IF THE GAS FURNACE IS INSTALLED IN A BASEMENT, AN EXCAVATED AREA OR CONFINED SPACE, IT IS STRONGLY RECOMMENDED TO CONTACT A PROPANE SUPPLIER TO INSTALL A GAS DETECTING WARNING DEVICE IN CASE OF A GAS LEAK.

•SINCE PROPANE GAS IS HEAVIER THAN AIR, ANY LEAKING GAS CAN SETTLE IN ANY LOW AREAS OR CONFINED SPACES.

•PROPANE GAS ODORANT MAY FADE, MAKING THE GAS UNDETECTABLE EXCEPT WITH A WARNING DEVICE.

A gas detecting warning system is the only reliable way to detect a propane gas leak. Rust can reduce the level of odorant in propane gas. Do not rely on your sense of smell. Contact a local propane gas supplier about installing a gas detecting warning system. If the presence of gas is suspected, follow the instructions on Page 3 of this manual.

All propane gas equipment must conform to the safety stan- dards of the National Board of Fire Underwriters, NBFU Manual 58.

For satisfactory operation, propane gas pressure must be 10 inch WC at the furnace manifold with all gas appliances in operation. Maintaining proper gas pressure depends on three main factors:

1.Vaporization rate, depending on temperature of the liquid, and “wetted surface” area of the container or containers.

2.Proper pressure regulation. (Two-stage regulation is recommended for both cost and efficiency).

3.Pressure drop in lines between regulators, and between second stage regulator and the appliance. Pipe size will depend on length of pipe run and total load of all appliances.

Complete information regarding tank sizing for vaporization, rec- ommended regulator settings, and pipe sizing is available from most regulator manufacturers and propane gas suppliers.

Since propane gas will quickly dissolve white lead and most standard commercial compounds, special pipe dope must be used. Shellac-based compounds resistant to the actions of liquefied petroleum gases such as Gasolac®, Stalactic®, Clyde’s® or John Crane® are satisfactory.

Refer to the following illustration for typical propane gas instal- lations and piping.

First Stage	5 to 15 PSIG
	(20 PSIG Max.)
Regulator		Continuous
		11" W.C.
200 PSIG		Second Stage
Maximum		Regulator

Propane Gas Installation (Typ.)

PROPANE GAS PIPING CHARTS

Sizing Between First and Second Stage Regulator*

Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 BTU/hour.

Pipe or			Tubing Size, O.D. Type L									Nominal Pipe Size
Tubing
												Schedule 40
Length,
	3/8"		1/2"	5/8"		3/4"			7/8"		1/2"				3/4"
Feet
10	730		1,700	3,200		5,300		8,300			3,200			7,500
20	500		1,100	2,200		3,700		5,800			2,200			4,200
30	400		920	2,000		2,900		4,700			1,800			4,000
40	370		850	1,700		2,700		4,100			1,600			3,700
50	330		770	1,500		2,400		3,700			1,500			3,400
60	300		700	1,300		2,200		3,300			1,300				310
80	260		610	1,200		1,900		2,900			1,200			2,600
100	220		540	1,000		1,700		2,600			1,000			2,300
125	200		490	900		1,400		2,300			900			2,100
150	190		430	830		1,300		2,100			830			1,900
175	170		400	780		1,200		1,900			770			1,700
200	160		380	730		1,100		1,800			720			1,500
Sizing Between Second Stage and Appliance Regulator*
Maximum Propane Capacities listed are based on 2 psig pressure drop at 10 psig setting.
Capacities in 1,000 BTU/hour.
Pipe or		Tubing Size, O.D. Type L								Nominal Pipe Size
Tubing										Schedule 40
Length,	3/8"	1/2"	5/8"	3/4"	7/8"	1-1/8"	1/2"			3/4"		1"	1-1/4"			1-1/2"
Feet
10	39	92	199	329	501	935	275			567		1,071	2,205			3,307
20	26	62	131	216	346	630	189			393		732	1,496			2,299
30	21	50	107	181	277	500	152			315		590	1,212			1,858
40	19	41	90	145	233	427	129			267		504	1,039			1,559
50	18	37	79	131	198	376	114			237		448	91			1,417
60	16	35	72	121	187	340	103			217		409	834			1,275
80	13	29	62	104	155	289	89			185		346	724			1,066
100	11	26	55	90	138	255	78			162		307	630			976
125	10	24	48	81	122	224	69			146		275	567			866
150	9	21	43	72	109	202	63			132		252	511			787
200	8	19	39	66	100	187	54			112		209	439			665
250	8	17	36	60	93	172	48			100		185	390			590

CIRCULATING AIR AND FILTERS

WARNING

NEVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON MONOXIDE, TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR SUPPLY.

Duct systems and register sizes must be properly designed for the CFM and external static pressure rating of the furnace. Ductwork should be designed in accordance with the recom- mended methods of “Air Conditioning Contractors of America” Manual D.

A duct system must be installed in accordance with Standards of the National Board of Fire Underwriters for the Installation of Air Conditioning, Warm Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B.

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