Time clock for exhaust fan

[greenspark1]

I'd like to use a simple line voltage programmable time clock light switch to control a 1/2HP 120V exhaust fan. Any reason this won't work? I'd also like to install it above a grid ceiling so it's right next to the fan. See any restrictions on this?

 

[bward]

What's the rating on the timer? Can it handle the HP load?
Might want to look into a cheap programmable motor starter instead.

 

[greenspark1]

Don't think I've seen programmable motor starters before, have one you like?
This is only 1/2HP 120V motor so most switches should be able to handle the load. But can the switch be installed above a drop ceiling (accessible by ladder)?

 

[Barbqranch]

Also, will the time clock have to be reset every power outage?

 

[mgookin]

Also, will the time clock have to be reset every power outage?

Bingo.

It's not just power outages but daylight savings time, battery maintenance, inability of the time clock to keep proper time, etc.

OP: What is exhausted by this fan?

 

[just the cowboy]

Try a tork

Try a tork

Try a tork digital time switch. They are good for1 hp at 120v or 1 1/2 at 208 and will keep time for 4 days without power, and they selfcorrect for daylight saving time and sunrise sunset. ewz type timer.

 

[Barbqranch]

I have a bedside clock radio that self-corrects for daylight savings time. Unfortunately, it corrects by the old schedule, so it is 2 weeks or so wrong. So, Instead of not having to adjust the time, or having to adjust it twice a year, I have to adjust it 4 times a year.

 

[AdrianWint]

I have a bedside clock radio that self-corrects for daylight savings time. Unfortunately, it corrects by the old schedule, so it is 2 weeks or so wrong. So, Instead of not having to adjust the time, or having to adjust it twice a year, I have to adjust it 4 times a year.

Repair by replacement?

 

[Barbqranch]

Repair by replacement?

I'm too cheap to buy a new clock radio. I do like the other features of this unit.

 

[kwired]

Keep in mind if this clock is directly switching the motor circuit - it is a motor controller, and depending on it's design will need a disconnecting means within sight. I say depending on it's design because if it would have some sort of switch incorporated that isn't able to be overridden by the timer it may itself qualify as a disconnecting means.

Also if this timer is "likely to require examination, adjustment, servicing, or maintenance while energized" it may need to comply with 110.26 working space requirements.

 

[bewing]

bewing

bewing

Typically, we use the Intermatic astronomic time clock. It is a 1-gang programmable time clock that can be coupled with a power pack if need be but is capable of switching 1/2 hp motor loads.

http://www.intermatic.com/en/Products/Timers/InWallTimers/Electronic_Timers/EJ600_Series.aspx