BLOWER PERFORMANCE
CFM versus Static Pressure (inches of water column dry coil w/ filter) 4% reduction for wet coil.
The air delivery can be varied by changing the blower speeds. This can allow for differences
encountered in installations.
The CFM can be checked by the following method;
(The optional Heat Kit must be installed to continue with this procedure.)
1) All access panels must be in place.
2) Start the unit in the heat mode.
3) Measure the return air temperature.
4) Measure the supply temperature. This measurement should be done in various locations
to obtain an average.
5) Subtract the return temperature from the supply temperature. This is referred to as the
temperature rise.
6) Measure the actual supply voltage and actual amperage at the terminal block/circuit
breaker.
7) The BTUH output = (Voltage x Amps x 3.41)
CFM =
output (BTUH)
1.08 X temperature rise
Should the CFM need to be increased or decreased it may be done by adjusting the blower
speed tap as shown on the wiring diagram.
14
Model
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.5
CFM
Static Pressure
2 Ton
900 877 856 835 816 795 766 737
630 614 599 585 571 556 536 515
High
Middle
------ 1240 1208 1177 1148 1121 1091 1061
------ 1125 1093 1062 1033 1006 976 946
High
Low
3 Ton
4
Ton
High
Low
5 Ton
5 Ton-E
High
Low
High
Low
------
1480
1650
1442
1605
1404
1560
1366
1515
1328
1470
1290
1425
1252
------
------
------
------
------
------
------
------
------ ------
1800
1745
1690
1635
1580
1525
------ ------
------
------
------
------
------
------
------ ------
1850
1795
1740
1685
1630
1575
