pct88
Member
I have an Energy Recovery Ventilator that is normally run at low speed for pre-heated/cooled (season dependent) fresh air supply to the house. I would like to have my HAI Omni panel increase the supply fans to full speed when the bathroom exhausts or clothes dryer is running to pull in more air to make up for what is being exhausted- i.e. bring in makeup air through the filtered and pre-conditioned ERV rather than through seepage.
I currently have a manual motor speed control that I use to adjust the airflow of a FanTech inline external rotor exhaust fan whose instructions say "100% speed controllable, All units are suitable for use with solid-state speed control" on the ERV. If I put a relay in parallel with the two wire speed control when the relay closes the fan would go to full speed, open and it will drop back to the speed setting selected by the speed control, correct? I would do this with a RIB relay so it is a solid short, control the RIB with a UPB I/O module.
This would at least give me high/low speed control of the blowers.
Has anyone tried this approach? When the relay closes it would look like a momentary short across the speed controller; perhaps the noise choke in there could maintain enough current to damage the triac?
I have three Fantech units each with standalone speed control; they work just fine with no motor buzzing. I have one underslab venting Fantech running at very low speed for years with no problem (i.e. the motor hasn't burned up on the one running at about 20% speed much of the year).
I currently have a manual motor speed control that I use to adjust the airflow of a FanTech inline external rotor exhaust fan whose instructions say "100% speed controllable, All units are suitable for use with solid-state speed control" on the ERV. If I put a relay in parallel with the two wire speed control when the relay closes the fan would go to full speed, open and it will drop back to the speed setting selected by the speed control, correct? I would do this with a RIB relay so it is a solid short, control the RIB with a UPB I/O module.
This would at least give me high/low speed control of the blowers.
Has anyone tried this approach? When the relay closes it would look like a momentary short across the speed controller; perhaps the noise choke in there could maintain enough current to damage the triac?
I have three Fantech units each with standalone speed control; they work just fine with no motor buzzing. I have one underslab venting Fantech running at very low speed for years with no problem (i.e. the motor hasn't burned up on the one running at about 20% speed much of the year).