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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.
13
Model
0.15 0.2 0.25 0.3 0.35 0.4 0.5
CFM
Static Pressure
HB4200VA1M25
HB4800VA1M25
HB6000VA1M25
High
Middle
2063 2008 1953 1898 1841 1784
1449 1411 1373 1335 1297 1259 1221
1701 1656 1611 1566 1518 1470
1449 1411 1373 1335 1297 1259 1221
Model
0.15 0.2 0.25 0.3 0.35 0.4 0.5
CFM
Static Pressure
HB3600VC1M25
HB6000VC1M25
2063 2008 1953 1898 1841 1784
1276 1244 1213 1184 1157 1127 1097