Cylon CBT-STAT - Balancing Procedure - Cbt12 Ivav

MAN0120US rev 16 © Cylon Controls Ltd. 19
BALANCING PROCEDURE – CBT12iVAV
This method will auto-calculate and set the K factor P4L08 TABPriKFactor (A214).
To utilize this feature, perform the following steps on Menu Page 4: Primary Balancing.
Note: Each parameter is shown below with its Menu page and line number, its Parameter Name and the
associated (Setpoint Number)
1. After determining what the maximum CFM setpoint is going to be for the VAV box, set 
TABPriAirManMode (D204) to .
2. Note the value in  TABPriManStpt (A218).
3. Wait for the value of  PriAirFlowCV (A194) to stabilize, then:
• If the value of  PriAirFlowCV (A194) reaches the value noted in step 2, get a hood
reading at the diffusers to get the actual CFM of the VAV box.
• If the value of  PriAirFlowCV (A194) doesn’t reach the value noted in step 2, set 
TABPriManStpt (A218) to a value below the value reached by  PriAirFlowCV (A194) as a
reference point.
4. Set the  TABPriHoodAtMax (A245) to the actual CFM reading that was recorded utilizing the
hood.
5. Set the  TABAutoCalKfactor (D151) to . It will stay  for 4 seconds then automatically be
set back to . This will automatically set the  TABPriKFactor (A214) internally, through the
Strategy calculating the required K factor. It will also set the  TABPriAirManMode (D204) to
, and the calculated  EffPriAirFlowStpt (A197) will go back to normal operation.
Note: When setting the  TABPriAirManMode (D204) to , it will stay on until the time entered
on point TABPriAirManModeTimer (A217) has expired, unless  TABAutoCalKfactor (D151) is
set to . The default for TABPriAirManModeTimer (A217) is 600 seconds or 10 minutes.