Modine Manufacturing HFG Series, Installation And Service Manual

Page: 15 / 24

5-571.4
15 15
Performance
table 15.1 — air temperature rise - low temperature rise Duct furnaces
➀ ➁ ➂
air temperature rise through unit (°f)
model btu/Hr 20 25 30 35 40 45 50 55 60
size input output max min
75
75,000 60,000 2778 2222 1852 1587 1389 1235 1111 1010 926
100
100,000 80,000 3704 2963 2469 2116 1852 1646 1481 1347 1235
125
125,000 100,000 4630 3704 3086 2646 2315 2058 1852 1684 1543
150
150,000 120,000 5556 4444 3704 3175 2778 2469 2222 2020 1852
175
175,000 140,000 6481 5185 4321 3704 3241 2881 2593 2357 2160
200
200,000 160,000 7407 5926 4938 4233 3704 3292 2963 2694 2469
225
225,000 180,000 8333 6667 5556 4762 4167 3704 3333 3030 2778
250
250,000 200,000 9259 7407 6173 5291 4630 4115 3704 3367 3086
300
300,000 240,000 11111 8889 7407 6349 5556 4938 4444 4040 3704
350
350,000 280,000 12963 10370 8642 7407 6481 5761 5185 4714 4321
400
400,000 320,000 14815 11852 9877 8466 7407 6584 5926 5387 4938
cfm
table 15.2 — air temperature rise - High temperature rise Duct furnaces
➀ ➁ ➂
air temperature rise through unit (°f)
model btu/Hr 20
➃
40
➃
50
➃
60 65 70 75 80 85 90 95 100
➄
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 11111
➅
6481 5185 4321 3989 3704 3457 3241 3050 2881 2729 2593
400
400,000 320,000 11111
➅
7407 5926 4938 4558 4233 3951 3704 3486 3292 3119 2963
cfm
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
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.
➃
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.
➄
For Variable Air Movement Applications, see page 11.
➅
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 Low Air Temperature
Rise Units is 60°F. The maximum allowable air temperature rise for High Air Temperature Rise 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 15.1
recommended unit configurations
200,000
BTU/HR
OUTPUT 65
O
F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65
O
F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65
O
F
TEMP. RISE
160,000
BTU/HR
OUTPUT
65
O
F
TEMP. RISE
TANDEM TOP VIEW
SINGLE TOP VIEW
PARALLEL TOP VIEW
2279 CFM
60
O
F ENTERING
AIR TEMP.
2279 CFM
20
O
F ENTERING
AIR TEMP.
125
O
F DISCHARGE
AIR TEMP.
150
O
F DISCHARGE
AIR TEMP.
5698 CFM
20
O
F ENTERING
AIR TEMP.
PREHEAT
UNIT
REHEAT
UNIT
200,000
BTU/HR
OUTPUT 65
O
F
TEMP. RISE
85
O
F DISCHARGE
AIR TEMP.
SEE SERVICE
CLEARANCES