Keezer Love Controller Help (TSS2-2100) - avoiding cycling compressor

[Improv241]

I'm trying to hook up my LOVE controller tonight, and I've spent about 3 hours now learning how to program it. Mostly, I've been playing, thinking about future projects, but my needs are REALLY simple.

My love controller turns the freezer compressor on when the temp probe reads over the setpoint SP1....nothing else.

My question...

Do people allow their freezer to go 1F below the setpoint in order to prevent the freezer compressor from kicking on and off quickly?

Right now, I've been testing it with my hand and an ice pack around 73F. As soon as it goes above 73F, the power kicks on like I want it to. But once it goes back down to 73F, it immediately turns off.

I'm planning to serve at 39F. But I don't want the compressor to kick on a 39.1F and off at 39.0F. I just see my compressor dying quickly.

Any tips? I've played with the r0-r8 settings, but I haven't found the trick yet.

Thanks!

B

 

[day_trippr]

I expect most people use the set point as the target and add some differential before the compressor kicks on. So turn-on happens at SP + DIFF, and turn-off happens at SP.

I'm pretty sure the Love controllers have a delay setting for both sets of relays, such that you can keep them from switching more frequently than the set value. You should enable that and set it for 10 minutes or so as compressor insurance...

Cheers!

 

[Improv241]

Exactly. But how?!

 

[lschiavo]

Don't you have two setpoints? I set one one degree high and the other one degree low and all seems to work great. I'm not sure we have the same model though as I also heat.

 

[day_trippr]

Exactly. But how?!

Ok, assuming you are only controlling a compressor with the TSS2, you would:

- Set SP1 to the temperature to turn off the compressor (ie: the coldest temperature you want to achieve)

- Set r1 to the differential - the number of degrees above SP1 you want to allow the fridge to warm. SP1 + r1 will be the temperature the compressor turns on.

- Set c0 for the number of minutes that the normally open relay remains open before it can be closed (and thus turn on the compressor). 10 would be a good starting value.

If everything else is set for factory defaults you should be good with just that much programming...

Cheers!

[edit]
If you look at the last page of the TSS2 user manual, you're using the mode shown in Figure 1 ("Mode ON OFF1 (On1) with r0=ind").
If you look closely at the diagram you can just see the "c0" time delay effect between the end of one ON state and the next ON state.

 

[Improv241]

Gold, thanks.