bypass humidifier queston

Anyone know if bypass humidifier allows air thru it at all time or just when there's a call for humidiy?
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Thanks Christopher
This unit does not have a manual damper so I guess I'm likely losing some amount of efficiancy year-round. Christopher do you have any sense of what the impact is?
The ones I used to install had a damper. The home owner would close the damper for summer.
During winter, the air would flow through the humidifier any time the blower was running. Humid, or dry, call or not.
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" Terri Smith" <ts8 at soalex.us> wrote in

The units that I have seen are installed in parallel with the main duct leaving the furnce air box. Air flows through the humidifier all the time with the humidifier only adding humidity when called for. There is no loss in efficiency at all because the humidifier air flow path is a small amount of extra flow capacity that would not be provided if the humidifier was not there. A damper is not required but if there was one it would keep air out in the summer which would keep the unit from getting a bit dusty.
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The units that I have seen are installed in parallel with the main duct leaving the furnce air box. Air flows through the humidifier all the time with the humidifier only adding humidity when called for. There is no loss in efficiency at all because the humidifier air flow path is a small amount of extra flow capacity that would not be provided if the humidifier was not there. A damper is not required but if there was one it would keep air out in the summer which would keep the unit from getting a bit dusty.
========================================Tnx Cris & Reno
This one definately loops back. There's plenty of room, so adding a damper will be easy
Understand point that looping back air is not big deal when burning fossile fuel My HP doesn't loose set-point it until outdoor temp goes below 22, so I'm using HP most of the winter. I suspect in HP mode, looping any warm back across the indoor coil probably reduces HP efficiency.
Begining to suspect another problem w/ this mostly HP mode of op. HP mode air not warm enough to evaporate water very well. In dry cold weather humidifier is running almost all the time the HP is on which at 22 deg is continuous. Humidifer is maintaining set-point, but there's a lot of unevaporated water being wasted.
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