Specifications

Setting Flow Coefficient
12
Siemens Industry, Inc.
140-0893 Start-up
Draft
1/12/2010
Setting Flow Coefficient
1. Set FLOW COEFF to the appropriate value found in Table Box Manufacturer Flow
Coefficients
. This value is a starting point for the air balancer.
2. To fine tune the flow coefficient use the following formula:
 new flow coefficient = (actual volume/controller volume) x old flow coefficient
The actual volume is the actual value obtained from the balancer’s
measurements. The controller volume is the value obtained from AIR VOLUME.
3. If the controller volume is not within 5% of the actual volume, repeat the procedure
until it is within 5%.
Box Manufacturer Flow Coefficients
Manufacturer
Sensor Type
Value
Anemostat 2-pipe without orifice
2-pipe with orifice
Spider without orifice
Spider with orifice
0.79
0.59
0.73
0.39
Carnes 2-pipe
Flow cross
0.66
0.59
Carrier 0.59
E.H. Price / Siemens Building Technologies Lab Terminal
Boxes
0.78
Environmental Technologies 0.79
Krueger 0.68
Metal Aire 0.72
Nailor Industries 0.69
Titus 0.60
Trane 0.66