036-21044-003-A-0304
28 Unitary Products
NOTES FOR TABLES 13 THROUGH 32:
• “Turns Open” refers to the setting of the variable pitch
motor sheave, where “0 Turns Open” is fully closed.
• Blower performance includes dry coil and 2” (51mm)
throw-away filters.
• Blower performance for gas heat includes the maximum
number of heat tubes available for each tonnage.
• ESP (External Static Pressure) given is that available for
the supply and return air duct system. All internal resis
-
tances have been deducted from the total static pressure
of the blower.
TABLE 31: BLOWER PERFORMANCE 12-1/2 TON - DOWNSHOT (IMPERIAL)
ESP
(iwg)
Turns Open
0 1 2 3 4 5
CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP CFM Watts BHP
0.4 5576 4015
4.32
5370 3547
3.80
5171 3197
3.43
5007 2884
3.09
4721 2515 2.70 4344 2145 2.30
0.6
5376 3839
4.12
5147 3376
3.62
4929 3022
3.24
4735 2704
2.90
4450 2353 2.52 4048 1991 2.13
0.8
5155 3652
3.92
4908 3197
3.43
4668 2841
3.05
4411 2501
2.68
4151 2183 2.34 3717 1829 1.96
1.0 4915 3456
3.71
4651 3013
3.23
4388 2656
2.85
4035 2281 2.45 3825 2008 2.15 - - -
1.2
4653 3253
3.49
4377 2823
3.03
4089 2467 2.65 3608 2051 2.20 - - - - - -
1.4
4372 3046
3.27
4087 3621
2.82
3771 2277 2.44 - - - - - - - - -
1.6 4070 2837
3.04
3780 2437
2.61
- - - - - - - - - - - -
1.8
3748 2629
2.82
- - - - - - - - - - - - - - -
TABLE 32: BLOWER PERFORMANCE 12-1/2 TON - DOWNSHOT (METRIC)
ESP
(Pa)
Turns Open
0 1 2 3 4 5
m
3
/s
In
(kW)
Out
(kW)
m
3
/s
In
(kW)
Out
(kW)
m
3
/s
In
(kW)
Out
(kW)
m
3
/s
In
(kW)
Out
(kW)
m
3
/s
In
(kW)
Out
(kW)
m
3
/s
In
(kW)
Out
(kW)
100
2.63 4.01 3.21 2.53 3.55 2.84 2.44 3.20 2.56 2.36 2.88 2.31 2.23 2.51 2.01 2.05 2.15 1.72
149
2.54 3.84 3.07 2.43 3.38 2.70 2.33 3.02 2.42 2.23 2.70 2.16 2.10 2.35 1.88 1.91 1.99 1.59
199
2.43 3.65 2.92 2.32 3.20 2.56 2.20 2.84 2.27 2.08 2.50 2.00 1.96 2.18 1.75 1.75 1.83 1.46
249
2.32 3.46 2.76 2.20 3.01 2.41 2.07 2.66 2.12 1.90 2.28 1.83 1.81 2.01 1.61 - - -
299
2.20 3.25 2.60 2.07 2.82 2.26 1.93 2.47 1.97 1.70 2.05 1.64 - - - - - -
349
2.06 3.05 2.44 1.93 2.63 2.10 1.78 2.28 1.82 - - - - - - - - -
399
1.92 2.84 2.27 1.78 2.44 1.95 - - - - - - - - - - - -
448
1.77 2.63 2.10 - - - - - - - - - - - - - - -
