41
RT-PRC010-EN
Table PD-25— Natural Gas Heating Capacities
Gas
Heat
Heat
Air Temperature Rise Vs Unit Cfm
Nominal
Heat
Input
Output
CFM
Tons
Module
(MBh)
(MBh)
28,350
30,250
32,550
34,750
37,000
39,250
41,500
43,000
46,000
90
High
1000
820
27
25
23
22
20
19
18
18
105
High
1000
820
23
22
20
19
18
18
16
115
High
1000
820
23
22
20
19
18
18
16
130
High
1000
820
23
22
20
19
18
18
16
Notes:
1. All heaters are 82% efficient.
2. Cfm values below the minimums and above the maximums shown in this table are
not
UL/CSA approved.
3. Air Temperature Rise = Heat Output (Btu) ÷ (Cfm x 1.085).
Table PD-26 — Steam Heating Capacities (Q/ITD)
1
20 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
4000
6000
8000
10000
Low Heat
0.95
1.18
1.37
1.52
High Heat
1.94
2.47
2.95
3.31
40 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
8000
12000
16000
20000
Low Heat
1.61
2.01
2.29
2.60
High Heat
3.36
4.28
4.93
5.43
60 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
12000
18000
24000
30000
Low Heat
2.32
2.81
3.33
3.71
High Heat
3.85
4.84
5.62
6.18
30 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
6000
9000
12000
15000
Low Heat
1.18
1.64
1.69
2.00
High Heat
2.47
3.12
3.59
3.95
55 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm
Module
11000
16500
22000
27500
Low Heat
1.91
2.38
2.72
2.92
High Heat
4.09
5.01
5.64
6.41
90, 105, 115, 130 Nominal Ton Units
Steam
Unit Standard Air Volume (Cfm)
Module
27000
33000 40000
46000
Low Heat
5.17
5.70
6.19
6.53
High Heat
8.83
8.80
9.04
9.26
Note:
1. Capacities expressed as MBH (Q) per initial
temperature difference (ITD) between the entering
air temperature to the steam module and the
entering steam temperature. Maximum
recommended operating pressure is 35 PSIG.
25 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
5000
7500
10000
12500
Low Heat
1.06
1.33
1.52
1.74
High Heat
2.20
2.85
3.31
3.65
50 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
10000
15000
20000
25000
Low Heat
1.82
2.21
2.60
2.85
High Heat
3.86
4.79
5.43
5.97
70 & 75 Nominal Ton Unit
Steam
Unit Standard Air Volume (Cfm)
Module
16000
20000
24000
30000
Low Heat
2.65
2.98
3.33
3.71
High Heat
4.50
5.10
5.62
6.18
Table PD-27 — Properties of Steam
Steam Pressure (Psig)
2
5
10
15
20
25
30
40
50
Temperature Of Steam (F)
219
227
239
250
259
267
274
287
298
Table PD-24 — Natural Gas Heating Capacities
Gas
Heat
Heat
Air Temperature Rise Vs Unit Cfm
Nom. Heat
Input
Output
CFM
Tons Module (MBh)
(MBh) 4000
5000
5760
6000 6284 7000
8000 9000 9792 10000 10682 10830 11200 11750 12000 13500 15000 16129 18000 20000 22500 23040 25000 27000 29377 30000
20
Low
235
192.7
44
36
31
30
28
25
22
20
High
500
410.0
66
63
60
54
47
42
25
Low
235
192.7
36
31
30
28
25
22
20
18
18
17
16
High
500
410.0
66
63
60
54
47
42
39
38
35
35
34
30
Low
350
287.0
44
42
38
33
29
27
26
25
24
24
23
22
20
High
500
410.0
60
54
47
42
39
38
35
35
34
32
31
28
40
Low
350
287.0
33
29
27
26
25
24
24
23
22
20
18
16
High
850
697.0
66
64
60
59
57
55
54
48
43
40
36
50
Low
500
410.0
38
35
35
34
32
31
28
25
23
21
19
17
High
850
697.0
60
59
57
55
54
48
43
40
36
32
29
55
Low
500
410.0
38
35
35
34
32
31
28
25
23
21
19
17
16
High
850
697.0
55
54
48
43
40
36
32
29
28
26
60
Low
500
410.0
31
28
25
23
21
19
17
16
15
14
High
850
697.0
54
48
43
40
36
32
29
28
26
24
70
Low
500
410.0
31
28
25
23
21
19
17
16
15
14
13
13
High
850
697.0
54
48
43
40
36
32
29
28
26
24
22
75
Low
500
410.0
31
28
25
23
21
19
17
16
15
14
13
13
High
850
697.0
54
48
43
40
36
32
29
28
26
24
22
Notes:
1. All heaters are 82% efficient.
2. Cfm values below the minimums and above the maximums shown in this table are
not
UL/CSA approved, see RT-EB-104 for further details.
3. Air Temperature Rise = Heat Output (Btu) ÷ (Cfm x 1.085).
Performance
Data