Circulating Air And Filters; Ductwork - Air Flow; Checking Duct Static - Goodman MH8 Installation Instructions Manual

C A
IRCULATING
First Stage
Regulator
200 PSIG
Maximum
Propane Gas Installation (Typ.)
P G P C
ROPANE AS IPING
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,
3/8" 1/2"
Feet
10 730 1,700
20 500 1,100
30 400 920
40 370 850
50 330 770
60 300 700
80 260 610
100 220 540
125 200 490
150 190 430
175 170 400
200 160 380
Sizing Between Second Stage and Appliance Regulator*
Maxim um Propane Capacities lis ted are bas ed on 2 ps ig pres s ure drop at 10 ps ig s etting.
Capacities in 1,000 BTU /hour.
Pipe or
Tubing Size, O.D. Type L
Tubing
Length,
3/8" 1/2" 5/8" 3/4"
Feet
10 39 92 199 329
20 26 62 131 216
30 21 50 107 181
40 19 41 90 145
50 18 37 79 131
60 16 35 72 121
80 13 29 62 104
100 11 26 55 90
125 10 24 48 81
150 9 21 43 72
200 8 19 39 66
250 8 17 36 60
C A
IRCULATING IR AND
D - A F
UCTWORK 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.
Ductwork should be designed in accordance with the recom-
mended methods of "Air Conditioning Contractors of America"
Manual D.
F
IR AND ILTERS
5 to 15 PSIG
(20 PSIG Max.)
Continuous
11" W.C.
Second Stage
Regulator
HARTS
Nominal Pipe Size
5/8" 3/4" 7/8" 1/2"
3,200 5,300 8,300 3,200
2,200 3,700 5,800 2,200
2,000 2,900 4,700 1,800
1,700 2,700 4,100 1,600
1,500 2,400 3,700 1,500
1,300 2,200 3,300 1,300
1,200 1,900 2,900 1,200
1,000 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
S chedule 40
7/8" 1-1/8" 1/2" 3/4" 1"
501 935 275 567 1,071
346 630 189 393 732
277 500 152 315 590
233 427 129 267 504
198 376 114 237 448
187 340 103 217 409
155 289 89 185 346
138 255 78 162 307
122 224 69 146 275
109 202 63 132 252
100 187 54 112 209
93 172 48 100 185
F
ILTERS
WARNING
,
OF COMBUSTION INCLUDING
DUCT WORK OR CIRCULATION
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.
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 installations requiring
more than 1800 CFM, use a bottom return or two sided return.
Supply and return connections to the furnace may be made
with flexible joints to reduce noise transmission. To prevent the
blower from interfering with combustion air or draft when a cen-
tral return is used, a connecting duct must be installed be-
tween the unit and the utility room wall. Furnace is shipped
with the top flanges in the flat position. Before installing a coil
or ducts, the flanges must be bent 90°. A room, closet, or
alcove must not be used as a return air chamber.
Schedule 40
When the furnace is used in connection with a cooling unit, the
3/4"
furnace should be installed in parallel with or on the upstream
7,500
side of the cooling unit to avoid condensation in the heating
4,200
4,000 element. With a parallel flow arrangement, the dampers or other
3,700
means used to control the flow of air must be adequate to
3,400
prevent chilled air from entering the furnace and, if manually
310
2,600
operated, must be equipped with means to prevent operation of
2,300
2,100 either unit unless the damper is in the full heat or cool position.
1,900
1,700
When the furnace is installed without a cooling coil, it is rec-
1,500
ommended that a removable access panel be provided in the
outlet air duct. This opening shall be accessible when the fur-
nace is installed and shall be of such a size that the heat
exchanger can be viewed for visual light inspection or such that
1-1/4" 1-1/2"
a sampling probe can be inserted into the airstream. The ac-
2,205 3,307
cess panel must be made to prevent air leaks when the furnace
1,496 2,299
is in operation.
1,212 1,858
1,039 1,559
913 1,417
NOTE: In a horizontal installation the air conditioning coil
834 1,275
724 1,066
must be adequately supported by proper brackets and
630 976
supports. Inadequate coil support can result in furnace cabinet
567 866
511 787
distortion and air leakage.
439 665
390 590
When the furnace is heating, the temperature of the return air
entering the furnace must be between 55°F and 100°F.
When a furnace is installed so that supply ducts carry air cir-
culated by the furnace to areas outside the space containing
the furnace, the return air shall also be handled by a duct sealed
to the furnace casing and terminating outside the space con-
CARBON taining the furnace.
AIR
C
HECKING
Refer to your furnace rating plate for the maximum ESP (exter-
nal 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 pres-
sure. The supply duct pressure must be read between the fur-
nace and the cooling coil. This reading is usually taken by
24
D S
UCT TATIC