Performance; Air Temperature And External Static Pressure Limits; Pressure Drop Curves - Modine Manufacturing IFS Installation And Service Manual

PERFORMANCE

Table 18.1 - Air Temperature Rise jkl
Model Input Output
Size (Btu/Hr) (Btu/Hr)
75 75,000 60,750
100
100,000 81,000
125 125,000 101,250
150 150,000 121,500
175 175,000 141,750
200 200,000 162,000
225
225,000 182,250
250 250,000 202,500
300 300,000 243,000
350
350,000 283,500 13,125 o
400 400,000 324,000 15,000 o
j Ratings are shown for elevations up to 2000 feet. For higher elevations, refer to section "Considerations for Elevation" on page 11.
k Minimum Air Temperature Rise is 20°F and Maximum Air Temperature Rise is 100°F. The Maximum Discharge Air Temperature is 150°F.
l High air temperature rise units include an air distribution baffle and restrictor change when compared to the low air temperature rise units. Field conversion of a high air temperature
rise to a low air temperature rise unit (or the opposite) requires a factory supplied conversion kit.
m The certified range of the High Temperature Rise Duct Furnaces is 20°-100°F but it is recommended that they be used from 60°-100°F to reduce the system pressure drop.
n For Variable Air Movement Applications, see page 15.
o The maximum CFM for the 350 and 400 sizes is 11,111CFM for high air temperature rise units (Digit 10=H) based on the maximum unit pressure drop.
Figure 18.1 - Recommended Unit Configurations j
2,308 CFM
162,000
2,308 CFM
j All duct furnaces are designed for a maximum allowable static pressure of 3.0" W.C. on the heat exchanger.
Figure 18.2 - Low Air Temperature Rise Duct
Furnace Pressure Drop vs. CFM Curves
1.4
Caution:
Do not exceed the CFM ranges
1.2
indicated in Table 18.1
1.0
0.8
150/175
0.6
100/125
0.4
75
0.2
0.0
18
20 m 40 m 50 m
2,813 1,406 1,125
3,750 1,875 1,500 1,250
4,688 2,344 1,875 1,563
5,625 2,813 2,250 1,875
6,563 3,281 2,625 2,188
7,500 3,750 3,000 2,500
8,438 4,219 3,375 2,813
9,375 4,688 3,750 3,125
11,250 5,625 4,500 3,750
6,563 5,250 4,375
7,500 6,000 5,000
162,000
162,000
250/300
350/400
200/225
CFM
Air Temperature Rise Through Unit (°F)
60 65 70 75
938 865 804 750
1,154 1,071 1,000
1,442 1,339 1,250
1,731 1,607 1,500
2,019 1,875 1,750
2,308 2,143 2,000
2,596 2,411 2,250
2,885 2,679 2,500
3,462 3,214 3,000
4,038 3,750 3,500
4,615 4,286 4,000
5,769 CFM
Figure 18.3 - High Air Temperature Rise Duct
Furnace Pressure Drop vs. CFM Curves
3.0
2.8
Caution:
Do not exceed the CFM ranges
2.6
indicated in Table 18.1
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
AIR 5-593.9
80 85 90
703 662 625
938 882 833
1,172 1,103 1,042
1,406 1,324 1,250
1,641 1,544 1,458
1,875 1,765 1,667
2,109 1,985 1,875
2,344 2,206 2,083
2,813 2,647 2,500
3,281 3,088 2,917
3,750 3,529 3,333
202,500
202,500
250/300
200/225
150/175
100/125
75
CFM
95 100
592 563
789 750
987 938
1,184 1,125
1,382 1,313
1,579 1,500
1,776 1,688
1,974 1,875
2,368 2,250
2,763 2,625
3,158 3,000
350/400