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Table 4 − Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate (Cont.)
(TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)
ALTITUDE
RANGE
HEAT VALUE
AT ALTITUDE
ft (m)
7001
(2134)
to
8000
(2438)
8001
(2439)
to
9000
(2743)
9001
(2744)
to
10000
(3048)
* Orifice numbers shown in BOLD are factory-installed.
RETURN AIR
SIZE
CONNECTION
0601716
SIDE/BOTTOM
0801716
SIDE/BOTTOM
BOTTOM or
1002120
4,5
TWO−SIDES
BOTTOM or
1202420
4,5
TWO−SIDES
See notes following table.
NOTES:
1. A filter is required for each return−air inlet. Airflow performance includes a 3/4 in. (19 mm) washable filter media such as contained in
factory− authorized accessory filter rack. See accessory list. To determine airflow performance without this filter, assume an additional
0.1 in. W.C. available external static pressure.
2. ADJUST THE BLOWER SPEED TAPS AS NECESSARY FOR THE PROPER AIR TEMPERATURE RISE FOR EACH INSTALLATION.
3. Shaded areas indicate that this airflow range is BELOW THE RANGE ALLOWED FOR HEATING OPERATION. THESE AIRFLOW
RANGES MAY ONLY BE USED FOR COOLING.
4. Airflows over 1800 CFM require bottom return, two−side return, or bottom and side return. A minimum filter size of 20" x 25" is required.
5. For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return.
6. All airflows that are shown in BOLD exceed 0.58 Watts per CFM at the given external static pressure.
12
SINGLE-STAGE FURNACE
A
V
G
.
G
A
S
0.58
Orifice
Manifold
(Btu/cu ft)
No.
Pressure
650
42
3.4
675
43
3.8
700
43
3.5
725
44
3.8
750
44
3.5
775
44
3.3
800
44
3.1
825
44
2.9
625
42
3.4
650
43
3.8
675
43
3.5
700
44
3.7
725
44
3.5
750
44
3.3
775
44
3.0
600
42
3.3
625
43
3.7
650
43
3.5
675
44
3.7
700
44
3.4
725
44
3.2
Table 5 – Air Delivery − CFM (With Filter)
WIRE
LEAD
COOLING
CFM
COLOR
TONS
/TON
Black
4.0
376
Yellow
3.5
377
3
Blue
3.0
387
3
Red
2.5
394
Black
4.0
408
Yellow
3.5
386
Orange
3.0
390
Blue
2.5
404
3
Red
2.0
390
Black
5.0
394
Yellow
5.0
367
Blue
4.0
416
Red
3.5
421
Black
5.0
410
Yellow
5.0
369
Blue
4.0
416
3
Red
3.5
414
Specifications subject to change without notice.
S
P
E
C
F I
C I
G
R
A
V
T I
Y
O
F
N
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
42
3.5
42
42
3.2
42
43
3.7
43
43
3.4
43
44
3.7
44
44
3.4
44
44
3.2
44
44
3.0
44
42
3.5
42
42
3.2
42
43
3.6
43
43
3.4
43
44
3.6
44
44
3.4
44
44
3.2
44
42
3.4
42
42
3.2
42
43
3.6
43
44
3.8
43
44
3.5
44
44
3.3
44
TEST AIRFLOW DELIVERY @ VARIOUS EXTERNAL STATIC PRESSURES
0.1
0.2
0.3
0.4
1600
1545
1505
1475
1380
1340
1335
1330
1190
1185
1195
1195
1030
1025
1030
1010
1800
1770
1735
1685
1445
1430
1410
1385
1250
1240
1225
1200
1090
1080
1060
1035
880
860
835
810
2270
2205
2130
2055
2090
2040
1980
1910
1850
1815
1775
1725
1580
1550
1540
1515
2385
2310
2230
2150
2130
2070
2010
1940
1875
1840
1795
1735
1610
1585
1555
1515
A
T
U
R
A
L
G
A
S
0.62
0.64
Manifold
Orifice
Manifold
Pressure
No.
Pressure
3.6
42
3.3
42
3.8
42
3.5
43
3.8
43
3.5
44
3.3
44
3.1
44
3.6
42
3.3
42
3.7
42
3.5
43
3.7
44
3.5
44
3.3
44
3.6
42
3.3
42
3.7
43
3.4
43
3.7
44
3.4
44
0.5
0.6
0.7
0.8
1505
1445
1400
1330
1320
1285
1225
1155
1160
1125
1075
1015
985
940
905
855
1630
1570
1495
1415
1350
1305
1255
1195
1170
1130
1090
1040
1010
970
930
885
780
750
710
665
1970
1880
1780
1670
1835
1755
1670
1570
1665
1600
1525
1435
1475
1420
1355
1280
2050
1920
1780
1650
1845
1740
1630
1525
1665
1580
1495
1410
1450
1395
1325
1250
440 04 6601 03
3.7
3.4
3.2
3.6
3.4
3.7
3.4
3.2
3.7
3.4
3.2
3.6
3.8
3.6
3.4
3.7
3.4
3.8
3.5
3.8
3.5
A11253B
0.9
1
1235
1140
1085
1000
950
885
805
735
1330
1230
1120
1045
975
910
835
765
615
560
1555
1425
1460
1340
1335
1225
1190
1100
1540
1415
1420
1305
1310
1205
1160
1080
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