Goodman Mfg MVC95 Circulating AIR & Filters, Propane Gas Piping Chart, Duct Work -AIR Flow

GAS SUPPLY AND PIPING

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
Feet	3/8"	1/2"	5/8"	3/4"	7/8"	1/2"	3/4"
10	730	1,700	3,200	5,300	8,300	3,200	7,500
20	500	1,100	220	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	3,100
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

To convert to capacities at 15 psig settings - multiply by 1.130

To convert to capacities at 5 psig settings - multiply by 0.879

Propane Gas Piping Chart I

Sizing Between Second or Second Stage Regulator & Appliance*

Maximum Propane Capacities listed are based on 1/2" W.C. pressure drop at 11" W.C. setting. Capacities in 1,000 BTU/hour.

Pipe or		Tubing Size, O.D. Type L						Nominal Pipe Size
Tubing
								Schedule 40
Length
Feet	3/8"		1/2"	5/8"	3/4"	7/8"	1/2"	3/4"	1"	1-1/4"	1-1/2"
10	39		92	199	329	501	275	567	1,071	2,205	3,307
20	26		62	131	216	346	189	393	732	1,496	2,299
30	21		50	107	181	277	152	315	590	1,212	1,858
40	19		41	90	145	233	129	267	504	1,039	1,559
50	18		37	79	131	198	114	237	448	913	1,417
60	16		35	72	1,211	187	103	217	409	834	1,275
80	13		29	62	104	155	89	185	346	724	1,066
100	11		26	55	90	138	78	162	307	630	976
125	10		24	48	81	122	69	146	275	567	866
150	9		21	43	72	109	63	132	252	511	787
200	8		19	39	66	100	54	112	209	439	665
250	8		17	36	60	93	48	100	185	390	590

*Data in accordance with NFPA pamphlet No. 54

Propane Gas Piping Chart II

CIRCULATING AIR & FILTERS

DUCT WORK -AIR FLOW

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. Design the ductwork in accordance with the recommended methods of “Air Conditioning Contractors ofAmerica” Manual D.

Install the duct system in accordance with Standards of the Na- tional Board of Fire Underwriters for the Installation ofAir Condition-

ing, Warm Air Heating and Ventilating Systems. Pamphlets No. 90A and 90B.

A closed return duct system must be used, with the return duct connected to the furnace. NOTE: Ductwork must never be at- tached to the back of the furnace. For upflow installations requir- ing 1800 CFM or more, use either two side returns or bottom return or a combination of side /bottom. Flexible joints may be used for supply and return connections to reduce noise transmis- sion. To prevent the blower from interfering with combustion air or draft when a central return is used, a connecting duct must be installed between the unit and the utility room wall. Never use a room, closet, or alcove as a return air chamber.

CHECKING DUCT STATIC

Refer to your furnace rating plate for the maximum ESP (ex- ternal duct static) rating.

Total external static refers to everything external to the fur- nace cabinet. Cooling coils, filters, ducts, grilles, registers must all be considered when reading your total external static pressure. The supply duct pressure must be read between the furnace and the cooling coil. This reading is usually taken by removing the “A” shaped block off plate from the end on the coil; drilling a test hole in it and reinstalling the block off plate. Take a duct static reading at the test hole. Tape up the test hole after your test is complete. The negative pressure must be read between the filter and the furnace blower.

Too much external static pressure will result in insufficient air that can cause excessive temperature rise. This can cause limit switch tripping and heat exchanger failure.

To determine total external duct static pressure, proceed as follows;

1.With clean filters in the furnace, use a draft gauge (in- clined manometer) to measure the static pressure of the return duct at the inlet of the furnace. (Negative Pressure)

2.Measure the static pressure of the supply duct. (Positive Pressure)

3.The difference between the two numbers is .4” w.c. Example:

static reading from return duct = -.1" w.c. static reading from supply duct = .3" w.c.

total external static pressure on this system = .4" w.c.

NOTE: Both readings may be taken simultaneously and read directly on the manometer if so desired. If an air conditioner coil or Electronic Air Cleaner is used in conjunction with the furnace, the readings must also include theses components, as shown in the following drawing.

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