120 vac fire damper, spring return/shut

[Milk man]

Should 120 vac fire damper acuators have disconnects so a guy can service them?

[maxster]

no .......what if you check a floor and forget to repower it .just disconnet the power wire at the 1900 box or within the damper actuator.

[Tech Rob]

No. The most you can hope for is a rib relay, a manual reset high limit, and an on/off switch.

There's not really much to do to those things. If you have 120v present at the motor, and it's not opening, get a new actuator.

[Milk man]

No. The most you can hope for is a rib relay, a manual reset high limit, and an on/off switch.

There's not really much to do to those things. If you have 120v present at the motor, and it's not opening, get a new actuator.

Got that. Except for the on/off switch.

Every once in a while after a power outage a couple of dampers wont open. I was calling the on/off switch a disconnect. None of them have it. I was thinking about installing an on/off switch when I exercise the actuator. Usually just pulling the hot works.

[zzonko]

That type of damper is called a combination fire/smoke damper (fsd) as opposed to a curtain-type fire damper (fd). They "fail" to the default position of closed when not energized. If there is not a dedicated fire control panel, they should be wired directly into the air-handler fan circuit,controlled with a firestat or a duct smoke detector. You then kill the FSD power by disconnecting the AHU circuit for servicing.

[nik99]

Various control panels and test switches are available as options on the dampers. They should be specified more but rarely are.