16
5-564
Air Temperature Rise Through Unit (°F)
Model Btu/Hr 20
➂
40
➂
50
➂
60 65 70 75 80 85 90 95 100
➃
Size Input Output Max Min
75 75,000 60,000 2778 1389 1111 926 855 794 741 694 654 617 585 556
100 100,000 80,000 3704 1852 1481 1235 1140 1058 988 926 871 823 780 741
125 125,000 100,000 4630 2315 1852 1543 1425 1323 1235 1157 1089 1029 975 926
150 150,000 120,000 5556 2778 2222 1852 1709 1587 1481 1389 1307 1235 1170 1111
175 175,000 140,000 6481 3241 2593 2160 1994 1852 1728 1620 1525 1440 1365 1296
200 200,000 160,000 7407 3704 2963 2469 2279 2116 1975 1852 1743 1646 1559 1481
225 225,000 180,000 8333 4167 3333 2778 2564 2381 2222 2083 1961 1852 1754 1667
250 250,000 200,000 9259 4630 3704 3086 2849 2646 2469 2315 2179 2058 1949 1852
300 300,000 240,000 11111 5556 4444 3704 3419 3175 2963 2778 2614 2469 2339 2222
350 350,000 280,000 11111➄ 6481 5185 4321 3989 3704 3457 3241 3050 2881 2729 2593
400 400,000 320,000 11111➄ 7407 5926 4938 4558 4233 3951 3704 3486 3292 3119 2963
PERFORMANCE
➀
Ratings are shown for elevations up to 2000 feet. For higher elevations, the input rating should be reduced at the rate of 4% per 1000 feet elevation above sea level. For Canada, in
elevations between 2000 and 4500 feet, the unit must be derated to 90% of the rating listed above.
➁
Units approved for use in California by CEC.
➂
Power vented indoor duct furnaces are supplied with a factory installed air baffle. For applications where an air tempature rise less than 60°F is desired, it is recomended to remove
this baffle to reduce system pressure drop.
➃
For Variable Air Movement Applications, see page 13.
➄
The maximum CFM for the 350 and 400 results in a 23°F and a 27°F air temperature rise (respectively) based on the maximum unit pressure drop.
Air Temperature and External Static Pressure Limits
The maximum allowable discharge air temperature is 150°F. The maximum allowable air temperature rise for all Power Vented Units
is 100°F. All duct furnaces are designed for a maximum allowable static pressure of 3.0" W.C. on the heat exchanger.
Figure 16.1 - Recommended Unit Configurations
200,000
BTU/HR
OUTPUT 65°F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65°F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65°F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65°F
TEMP. RISE
TANDEM TOP VIEW
SINGLE TOP VIEW
PARALLEL TOP VIEW
2279 CFM
60°F ENTERING
AIR TEMP.
2279 CFM
20°F ENTERING
AIR TEMP.
125°F DISCHARGE
AIR TEMP.
150°F DISCHARGE
AIR TEMP.
5698 CFM
20°F ENTERING
AIR TEMP.
PREHEAT
UNIT
REHEAT
UNIT
200,000
BTU/HR
OUTPUT 65°F
TEMP. RISE
85°F DISCHARGE
AIR TEMP.
SEE SERVICE
CLEARANCES
Table 16.1 - Air Temperature Rise - Power Vented Indoor Duct Furnaces ➀ ➁
CFM
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