Appendix B: VAV Controller Flow Calculation Constants
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1 Appendix Issue Date September 18, 2003 Appendix B: VAV Controller Flow Calculation VAV Controller Flow Calculation...2 Introduction... 2 ey Concepts... 3 About Flow Calculation... 3 Carnes Company... 4 Environmental Technologies, Inc. (ETI)... 5 Metal Industries... 6 Nailor Industries, Inc....7 E.H. Price, Ltd. (Winnipeg, Canada)... 9 TITUS The Trane Company Johnson Controls, Inc. Code No. LIT
2 2 Appendix B: VAV Controller Flow Calculation VAV Controller Flow Calculation Introduction This section provides flow calculation constants for some commonly used box manufacturers.
3 Appendix B: VAV Controller Flow Calculation 3 ey Concepts About Flow Calculation A flow calculation constant is referred to as the flow multiplier in Variable Air Volume (VAV) controller applications created with HVAC PRO software. Other common terms for this constant are -constant or pickup gain. The following is the standard equation for calculating flow: Flow = 4005 P Velocity PickupGain Rearranging the previous equation allows calculation of the flow multiplier (pickup gain): PickupGain = Flow P Velocity Flow is in cubic feet per minute (cfm). is in square feet is a constant specific to this equation. P Velocity is in inches water column (w.c.). For more information on the flow multiplier, see the VAV System Operation Theory section of the VAV Terminal Control Applications Application Note (LIT ). The VAV box flow calculation constants in this document represent constants used by some common box manufacturers. Note: These constants are subject to change without notice due to the manufacturers design changes. Contact the specific manufacturer if you require any other information relative to accuracy. Note: Flow constants are based on laboratory data. Actual jobsite cfm readings may differ due to the accuracy of the balancer s flow measurement equipment and due to turbulence and leakage.
4 4 Appendix B: VAV Controller Flow Calculation Carnes Company Damper characteristics include: 90 travel clockwise rotation to close 3/8 in. round shaft Table 1: Carnes Company Box Information Box Type Standard Sensor -- Cross-Flow Sensor -- Model Number Table 2: Carnes Company Standard Sensor x x x Table 3: Carnes Company Cross-Flow Sensor x x x
5 Appendix B: VAV Controller Flow Calculation 5 Environmental Technologies, Inc. (ETI) Damper characteristics include: round butterfly dampers 90 damper stroke clockwise rotation to close 1/2 in. round shaft full open and full close damper stops Table 4: ETI Box Information Box Type -- SDR -- CFR -- VFR Model Number Table 5: ETI
6 6 Appendix B: VAV Controller Flow Calculation Metal Industries Damper characteristics include: 90 travel either direction to close 3/8 in. square shaft Table 6: Metal Industries Box Information Box Type Single Duct (Cooling Only) With: Electric Reheat -- HW Reheat -- Special Pickups -- Retro its -- Constant to VAV (6-8-10) Square Retros -- Dual Duct -- Fan Induction -- Bypass -- Model Number Table 7: Metal Industries High Gain Unit* x (20 x 16) (24 x 16) * High Gain Unit is available at no charge.
7 Appendix B: VAV Controller Flow Calculation 7 Nailor Industries, Inc. Damper characteristics include: 90 travel (retrofit units) or 45 travel (single duct, dual duct, and fan powered units) counterclockwise rotation to open 1/2 in. shaft Table 8: Nailor Industries, Inc. Box Information Box Type Model Number Retrofit Terminal Unit Round 36 VRR Square or Rectangular 36 VRS Single Duct Terminal Unit 3000 Series Dual Duct Terminal Unit 3200 Series Series Fan Power Terminal Unit 35S 35SST Parallel Fan Power Terminal Unit 35P Table 9: Nailor Industries, Inc. for Retrofit Terminal Units Round Units Square or Rectangular Units Unit Size Constant Unit (Port) Size Constant
8 8 Appendix B: VAV Controller Flow Calculation Table 10: Nailor Industries, Inc. for Single Duct and Dual Duct Terminal Units (oval) (oval) (oval) x Table 11: Nailor Industries, Inc. for Series and Parallel Fan Power Terminal Units (oval) (oval)
9 Appendix B: VAV Controller Flow Calculation 9 E.H. Price, Ltd. (Winnipeg, Canada) Damper characteristics include: 90 travel counterclockwise rotation to close 1/2 in. round shaft Table 12: E.H. Price, Ltd. Box Information Box Type Single Duct (Cooling Only) Fan Powered Terminal Units Series Fan (Constant Volume) Parallel Fan Dual Duct* Model Number SDV5000/8000 FDC5000/8000 FDV5000/8000 DDS5000/8000 DDQ5000/8000 * Different constants are provided for dual duct downstream (total flow) sensors and inlet sensors. Table 13: E.H. Price, Ltd. for Single Duct, Fan Powered, and Dual Duct Inlet Boxes x
10 10 Appendix B: VAV Controller Flow Calculation Table 14: E.H. Price, Ltd. for Dual Duct Downstream (Total Flow) Boxes TITUS Damper characteristics for all units include: 90 travel counterclockwise rotation to close 1/2 in. diameter damper shaft Table 15: TITUS Box Information Box Type Single Duct (Cooling Only) Fan-Powered Terminal Units Series Fan (Constant Volume) Parallel Fans (Variable Volume) Dual Duct Terminal Units DESV DECV DTFC DTQS DFCL DMFV DTQP DFVL DEDV DEDC DMDV Model Number
11 Appendix B: VAV Controller Flow Calculation 11 Table 16: TITUS for Inlet Sensor Applications * * Includes all units except Quiet Constant Volume (QCV) retrofit units. Table 17: TITUS for Discharge Sensor Dual Duct Applications
12 12 Appendix B: VAV Controller Flow Calculation The Trane Company The Trane Company boxes contain an internal actuator. When ordering, select part number AP-VMA1430, which is a controller without an actuator. Table 18: The Trane Company D and E Style Air Valve Box Actuator Time (seconds) Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI Published in U.S.A.
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