Circulating Air & Filters; Duct Work - Air Flow; Checking Duct Static - Amana MSS9 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 Tubing Size, O.D. Type L
Length
Feet 3/8" 1/2" 5/8"
10 730 1,700 3,200
20 500 1,100 220
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
125 200 490 900
150 190 430 830
175 170 400 780
200 160 380 730
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
C A & F
IRCULATING IR
D - A F
UCT WORK IR LOW
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 National Board of Fire Underwriters for the Installation of Air Conditioning,
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 attached
to the back of the furnace. For upflow installations requiring 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 transmission. 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.
C D S
HECKING UCT TATIC
Refer to your furnace rating plate for the maximum ESP (external duct static) rating.
Total external static refers to everything external to the furnace 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 (inclined 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.
Nominal Pipe Size
Schedule 40
3/4" 7/8" 1/2"
5,300 8,300 3,200
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
1,400 2,300 900
1,300 2,100 830
1,200 1,900 770
1,100 1,800 720
ILTERS
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.
Pip e o r
Tu bin g T ub ing S iz e, O .D. T yp e L
Len gt h
3/4"
F eet 3/8" 1/2"
7,500
10 39 92
4,200
20 26 62
4,000
30 21 50
3,700
40 19 41
3,400
50 18 37
3,100
60 16 35
2,600
80 13 29
2,300
100 11 26
2,100
125 10 24
1,900
150 9 21
1,700
200 8 19
1,500
250 8 17
*Data in ac cor danc e wit h NFP A pamphl et No. 54
N
EVER ALLOW THE PRODUCTS OF COMBUSTION
,
MONOXIDE TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR
.
SUPPLY
29
Nom inal P ipe Siz e
5/8" 3/4" 7 /8" 1/2" 3/4"
199 3 29 501 275 567
131 2 16 346 189 393
107 1 81 277 152 315
90 1 45 233 129 267
79 1 31 198 114 237
72 1 21 187 103 217
62 1 04 155 89 185
55 9 0 138 78 162
48 8 1 122 69 146
43 7 2 109 63 132
39 6 6 100 54 112
36 6 0 93 48 100
Propane Gas Piping Chart II
WARNING
S chedu le 40
1" 1- 1/4" 1- 1/2"
1,07 1 2,205 3,307
732 1,496 2,299
590 1,212 1,858
504 1,039 1,559
448 913 1,417
409 834 1,275
346 724 1,066
307 630 976
275 567 866
252 511 787
209 439 665
185 390 590
,
INCLUDING CARBON