ENERVEX BEF 225x, Installation & Operating Manual

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010.1220.0719 01.21

5.9  INSTALLING A PROVEN FLOW SYSTEM

If required by local codes, a safety system can be interlocked 

with the appliance(s) to prove fan operation. The safety 

system could utilize a Proven Draft Switch (PDS), a thermal 

switch, a flow switch or a sail switch. The device must be 

interlocked with the appliance(s) so it shuts down in case of 

fan failure or power failure.
Please refer to the PDS Installation Manual for wiring 

instructions. 
If the installation includes a MEC24 Exhaust Control or 

EBC 30/31 Modulating Pressure Fan Control, a PDS is not 

required as the function is integrated into the control.
For more information about alternative safety system, please 

consult ENERVEX.

5.8 Start up Sequence (Auto Tune) 

This start up process covers a BEFx Box Ventilator with 

EDrive E3 controlled by an EBC 24 or EBS 31 Modulating 

Draft Controller, which is the most common configuration 

for a BEFx Box Ventilator. Start up processes for other 

configurations are available from ENERVEX.

Note, that one of the most important steps in the start up 

process is to activate “Auto Tune”. Any time a parameter 

change is taking place, the last part is always to activate 

“Auto Tune”.

These are the steps needed to perform a successful Auto 

Tune & start up.
Start Signal: 

From EBC to Terminal 1 (eDrive).

                        From EBC to Terminal 2 (eDrive).
Speed Ref:   

From EBC to Terminal 6 (eDrive).

                       From EBC to Terminal 7 (eDrive).
1.  Remove the control wire from EDrive Terminal 1.
2.  Press and hold the        button on the eDrive for 5+ 

seconds. The will take you to the parameter list  

(likely P01).

3.  Scroll to P14 & Set P14 to “1685” (with the        keys),   

press the  button to accept.

4.  Scroll to P38, Set P38 to “0” (with the keys), press the     

        button to accept.

5.  Scroll to P52 and set P52 to “1” then press and hold the  

             button until the display indicates the drive is in “Auto  

Tune”, then let go of the  button.

After Auto Tune is complete, the eDrive should display   

 “STOP”.
6.  Program the EBC Controller, if needed.
7.  Re-connect the control wire to EDrive Terminal 1. The    

EDrive should display H xxx (Hertz to the motor).

8.  Confirm that the motor rotation direction is correct.
9.  Press & Release the       button on the EDrive until  

“Amps” is displayed, note the Amp draw. Note the Amp  

screen is designated by Axxxx

10.  When done: If it is desired to lock the parameters: return  

P38 to “0” then return P14 to “1700”.