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46 | PRODUCT DATA
Single Zone Vertical Air Handling Unit Engineering Manual
Electric Heater Static Pressure Drop Factors
Table 19: Electric Heater Static Pressure Drop Factors.
Heater Capacity (kW) Static Pressure Drop (in. wg)
0 0
3, 5 -0.01
8, 10 -0.02
15 -0.03
20 -0.04
in wg = inch water gauge
If the electric heater has been installed, then the ESP value has to be set.
For every increase in static pressure by 0.01 in wg, the ESP value must be increased by 1.
If the ESP setting value is inappropriate, the provided safety device will turn the heater off
according to the airflow.
Table 20: Down Flow Static Pressure Drop Factors.
If the air filter has been installed, the ESP value has to be set.
For every increase in static pressure by 0.01 in. wc, the ESP value must be increased by
1.
Capacity (kBtu/h [tons]) Flow Rate (CFM) Static Pressure Drop (in wg)
18 (1.5) High (640) -0.04
Middle(580) -0.04
Low (480) -0.04
24 (2.0) High (710) -0.04
Middle(640) -0.04
Low (480) -0.04
36 (3.0) High (1100) -0.09
Middle(1000) -0.09
Low (900) -0.09
42 (3.5) High (1260) -0.09
Middle(1100) -0.09
Low (1000) -0.09
48 (4.0) High (1400) -0.09
Middle(1260) -0.09
Low (1000) -0.09
Down Flow (optional) Static Pressure Drop Factors
EXTERNAL STATIC PRESSURE AND AIRFLOW RANGES
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