Circulating Air & Filters; Duct Work - Air Flow; Checking Duct Static - Goodman MVM96 Installation Instructions Manual

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
Tubing
Length
Feet
3/8" 1/2"
10 730 1,700 3,200
20 500 1,100
30 400 920 2,000
40 370 850 1,700
50 330 770 1,500
60 300 700 1,300
80 260 610 1,200
100 220 540 1,000
125 200 490
150 190 430
175 170 400
200 160 380
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 Tubing Size, O.D. Type L
Length
Feet
3/8" 1/2" 5/8"
10 39 92 199
20 26 62 131
30 21 50 107
40 19 41 90
50 18 37 79
60 16 35 72
80 13 29 62
100 11 26 55
125 10 24 48
150 9 21 43
200 8 19 39
250 8 17 36
*Data in accordance with NFPA pamphlet No. 54
Propane Gas Piping Chart II
C A & F
IRCULATING IR
D - A F
UCT WORK IR LOW
N
EVER ALLOW THE PRODUCTS
,
MONOXIDE TO ENTER THE RETURN
.
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 of America" Manual D.
Install the duct system in accordance with Standards of the Na-
tional Board of Fire Underwriters for the Installation of Air Condition-
ing, Warm Air Heating and Ventilating Systems. Pamphlets No.
90A and 90B.
Nominal Pipe Size
Schedule 40
5/8" 3/4" 7/8" 1/2"
5,300 8,300 3,200
220 3,700 5,800 2,200
2,900 4,700 1,800
2,700 4,100 1,600
2,400 3,700 1,500
2,200 3,300 1,300
1,900 2,900 1,200
1,700 2,600 1,000
900 1,400 2,300 900
830 1,300 2,100 830
780 1,200 1,900 770
730 1,100 1,800 720
Nominal Pipe Size
Schedule 40
3/4" 7/8" 1/2" 3/4" 1" 1-1/4" 1-1/2"
329 501 275 567 1,071 2,205
216 346 189 393 732 1,496
181 277 152 315 590 1,212
145 233 129 267 504 1,039
131 198 114 237 448 913
1,211 187 103 217 409 834
104 155 89 185 346 724
90 138 78 162 307 630
81 122 69 146 275 567
72 109 63 132 252 511
66 100 54 112 209 439
60 93 48 100 185 390
ILTERS
WARNING
,
OF COMBUSTION INCLUDING CARBON
DUCT WORK OR CIRCULATION
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
3/4"
used for supply and return connections to reduce noise transmis-
7,500
sion. To prevent the blower from interfering with combustion air or
4,200
draft when a central return is used, a connecting duct must be
4,000
3,700
installed between the unit and the utility room wall. Never use a
3,400
room, closet, or alcove as a return air chamber.
3,100
2,600
C D
2,300
HECKING UCT
2,100
1,900
Refer to your furnace rating plate for the maximum ESP (ex-
1,700
ternal duct static) rating.
1,500
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
3,307
be read between the filter and the furnace blower.
2,299
1,858
Too much external static pressure will result in insufficient air
1,559
1,417
that can cause excessive temperature rise. This can cause
1,275
limit switch tripping and heat exchanger failure.
1,066
976
To determine total external duct static pressure, proceed as
866
787
follows;
665
590
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.
AIR
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.
4. Consult proper tables for the quantity of air.
If the total external static pressure exceeds the maximum
listed on the furnace rating plate, check for closed dampers,
registers, undersized and/or oversized poorly laid out duct work.
33
S
TATIC