Packaged Rooftop Air Conditioners Manual
41RT-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) 4
000 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