Major problem with AC JR

[jezzeaepi]

Thanks Cy =)

 

[DonW]

What if the ac jr fails on though and not off. Do the rancos have a upper and lower limit that it shuts off at? I.e. If my target temp on the Ac is 77, and I set my Ranco to to 76, is there a way to set an upper limit as well? so the ranco will shut off the power to the heater if it reaches 79? I know the AC jr has upper and lower limits you can set, just wasn't sure if they were all like that.



With the power cord that I am cutting, I do nothing with the red side then correct? Just cover i up good with some heatshrink and electrical tape? I appoligize I am quite the novice when it comes to electrical area of reefing. Ill get a friend to help me so I don't do something dumb =P

Let me look at the schematic this week-end, I cant store all that ifo in my tiny brain. Your not running a chiller correct?

Don

 

[mower7]

Don't you get your temperature redundancy if you use heaters with set points ? That is "normal aquarium heaters" with their set point set higher (but not too high) than the controllers setpoint.

So if the controller goes insane, and turns the heaters on at too high a temp, the heaters will still not heat because the temperature is above the set point ?

It sounds like you are talk about adding triple redundancy, unless you are using heaters that do not have set points.

Jack

 

[DonW]

Don't you get your temperature redundancy if you use heaters with set points ? That is "normal aquarium heaters" with their set point set higher (but not too high) than the controllers setpoint.

So if the controller goes insane, and turns the heaters on at too high a temp, the heaters will still not heat because the temperature is above the set point ?

It sounds like you are talk about adding triple redundancy, unless you are using heaters that do not have set points.

Jack

Only works for high temp, not low temp like the failure that happened in this case. Also assumes the heaters have have a thermostat but that is a good question. I personally dont use ones with thermostats. Do yours have stats Jezzeapei?

Don

Don

 

[jezzeaepi]

Thats correct I do not run a chiller.

The heaters I use do have their own thermostats, but they are not very accurate. They are anywhere from 5 to 8 degerees off their stated temperature and that changes as corraline builds up between cleanings. I can use them to stop the tank from going to 90, but probably not before they hit 85+. Thats not tank wipe out range, but Im sure id suffer from some bleaching and polyp bailout which I would rather avoid.

 

[DonW]

Thats correct I do not run a chiller.

The heaters I use do have their own thermostats, but they are not very accurate. They are anywhere from 5 to 8 degerees off their stated temperature and that changes as corraline builds up between cleanings. I can use them to stop the tank from going to 90, but probably not before they hit 85+. Thats not tank wipe out range, but Im sure id suffer from some bleaching and polyp bailout which I would rather avoid.

I'll look at the schematic this week-end or take pics of my spare. Those stats are kind of why they really should not even be counted as redundancy. Probably the number one failure.

Don