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Goodman GMS8 Installation & Operating Instructions Manual: Circulating Air And Filters; Filters - Read This Section Before Installing The Return Air Ductwork; Upright Installations; Circulairtion Air Filters

Gas fired warm air furnace single stage.
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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
3,200
20
500
1,100
2,200
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
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"
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
X. CIRCULATING AIR AND FILTERS
Ductwork - Air
N
EVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON
MONOXIDE, TO ENTER THE RETURN DUCTWORK 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
recommended 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.
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. 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 central return is used, a connecting
duct must be installed between the unit and the utility room wall. A
room, closet, or alcove must not be used as a return air chamber.
When the furnace is used in connection with a cooling unit, the
furnace should be installed in parallel with or on the upstream
side of the cooling unit to avoid condensation in the heating
element. With a parallel flow arrangement, the dampers or other
means used to control the flow of air must be adequate to prevent
chilled air from entering the furnace and, if manually operated,
must be equipped with means to prevent operation of either unit
unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be provided in the
Nominal Pipe Size
Schedule 40
5/8"
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
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
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
WARNING
outlet air duct. This opening shall be accessible when the furnace
is installed and shall be of such a size that the heat exchanger
can be viewed for visual light inspection or such that a sampling
probe can be inserted into the airstream. The access panel must
be made to prevent air leaks when the furnace is in operation.
3/4"
When the furnace is heating, the temperature of the return air
7,500
4,200
entering the furnace must be between 55°F and 100°F.
4,000
3,700
When a furnace is installed so that supply ducts carry air circulated
3,400
by the furnace to areas outside the space containing the furnace,
310
the return air shall also be handled by a duct sealed to the furnace
2,600
2,300
casing and terminating outside the space containing the furnace.
2,100
1,900
F
- R
ILTERS
EAD
1,700
1,500
R
A
D
ETURN
IR
Filters must be used with this furnace. Discuss filter maintenance
with the building owner. Filters do not ship with this furnace, but
must be provided by the installer. Filters must comply with UL900
or CAN/ULCS111 standards. If the furnace is installed without
1-1/4" 1-1/2"
filters, the warranty will be voided.
2,205
3,307
1,496
2,299
NOTE: An undersized opening will cause reduced airflow. The
1,212
1,858
1,039
1,559
bottom return is set up as a knock out.
91
1,417
834
1,275
U
I
724
1,066
PRIGHT
NSTALLATIONS
630
976
567
866
Depending on the installation and/or customer preference,
511
787
differing filter arrangements can be applied. Filters can be
439
665
390
590
installed in the central return register or a side panel external filter
rack kit (upflows), or the ductwork above a counterflow furnace. As
an alternative, a media air filter or electronic air cleaner can be
used as the requested filter. The following figures show possible
filter locations.
C
A
IRCULATION
One of the most common causes of a problem in a forced air
heating system is a blocked or dirty filter. Circulating air filters
must be inspected monthly for dirt accumulation and replaced if
necessary. Failure to maintain clean filters can cause premature
heat exchanger failure.
A new home may require more frequent replacement until all
construction dust and dirt is removed. Circulating air filters are to
be installed in the return air duct external to the furnace cabinet.
FURNACE INPUT
45M
68M
90M
115M
135M
45M
68M
90M
115M
135M
PERMANENT NOMINAL 600 C.F.M.
DISPOSABLE NOMINAL 300 C.F.M.
H
I
ORIZONTAL
NSTALLATIONS
Filters must be installed in either the central return register or in
the return air duct work.
21
T
S
B
HIS
ECTION
EFORE
UCTWORK
F
IR
ILTERS
MINIMUM FILTER SIZES
FILTER SIZE
2
160 in
2
241 in
2
320 in
2
400 in
2
370 in
2
320 in
2
483 in
2
640 in
2
800 in
2
738 in
I
T
NSTALLING
HE
TYPE
permanent
permanent
permanent
permanent
permanent
disposable
disposable
disposable
disposable
disposable

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