Cds air handler and elec heat

[timmer]

Is there a low static pressure threshold where you would lockout elec heat because not enough air flow?with a VFD running on the air handler.

 

[petersonra]

Is there a low static pressure threshold where you would lockout elec heat because not enough air flow?with a VFD running on the air handler.

Probably a good idea. most times duct heaters have it built in IME.

 

[Eddie702]

If you buy a "packaged unit with the fan and heater built in they will sometimes have no protection against loss of air flow. I always thought this was foolish.

To my mind it should have a good differential air proving switch and /or a ct on the motor power to disable the heat when the motor shuts down.

Otherwise, plugged filters or a bad motor ,,,,,,,and then you buying new heater elements

 

[petersonra]

If you buy a "packaged unit with the fan and heater built in they will sometimes have no protection against loss of air flow. I always thought this was foolish.

To my mind it should have a good differential air proving switch and /or a ct on the motor power to disable the heat when the motor shuts down.

Otherwise, plugged filters or a bad motor ,,,,,,,and then you buying new heater elements

I am surprised UL would list it that way.