Seasonal temp acting weird

[uscgbeachbum]

So I've updated the seasonal temp chart to better coincide with the temps we keep in the house (lower in winter, warmer in summer) to minimize electricity bill. My temp for the month of March is 75.5 deg. Since moving it from a defined temp range over to the seasonal temps, my temperatures have been too high.

Fallback OFF
If Temp < RT+-0.2 Then ON (should turn on when <75.3)
If Temp > RT+0.2 Then OFF (should turn off when >75.7)

However, my temps are currently around 76.5.

What gives?

[kenargo]

You cannot go by the temp of the tank as a heater continues to heat well after the power is turned off (as well as heat introduces by equipment).

Have you looked at the outlet log and reviewed the ON/Off transitions of the heater outlet to determine if the outlet is behaving as programmed?

[uscgbeachbum]

The strange thing is that this only started when I adjusted my temp to a seasonal temp. I use the Ebo Jagr heaters which have an orange light when they are on. They've been on well past when they should have turned off.

Here's the log over the past couple of hours. The amperage draw is only my heaters as everything else (for now) is plugged onto a dj switch panel. It looks like the heaters are turning on at 75.8 and turning off at 76.2

11:50 03/02/2014 75.9 7.99 0.0
12:00 03/02/2014 76.1 7.99 2.6
12:10 03/02/2014 75.9 7.99 0.0
12:20 03/02/2014 75.7 7.99 2.6
12:30 03/02/2014 75.8 7.99 0.0
12:40 03/02/2014 75.9 7.99 0.0
12:50 03/02/2014 75.9 7.99 0.0
13:00 03/02/2014 75.8 7.98 0.0
13:10 03/02/2014 75.9 7.98 0.0
13:20 03/02/2014 75.7 7.98 2.6
13:30 03/02/2014 76.1 7.98 2.7
13:40 03/02/2014 76.3 7.98 0.0
13:50 03/02/2014 76.0 7.98 0.0
14:00 03/02/2014 75.9 7.98 0.0
14:10 03/02/2014 76.1 7.98 2.7
14:20 03/02/2014 76.3 7.98 0.0
14:30 03/02/2014 75.9 7.98 0.0
14:40 03/02/2014 75.8 7.98 2.7
14:50 03/02/2014 76.2 7.98 2.6
15:00 03/02/2014 76.2 7.98 0.0
15:10 03/02/2014 75.9 7.98 0.0
15:20 03/02/2014 75.9 7.98 2.6

Any ideas?

Thanks.

[uscgbeachbum]

In case anyone is having the same problem as me I thought I'd give an update. I thought my + and - syntax might be incorrect so I set it to:

Fallback OFF
If Temp < RT+-0.4 Then ON (should turn on when <75.1)
If Temp > RT+0.0 Then OFF (should turn off when >75.5)

and let it just run for a full day. I get home and check the temp logs and sure enough it was working as it should be (within the RT+-0.4 to RT+0.0 range). Maybe it was an internal clock thing and needed some time to think through itself? Either way, I've changed it back to the original values and expect it to be working tomorrow.

Hope this helps someone. I know I was frustrated. :)

[dowzer]

I had a similar problem and came to the conclusion that the relative temperature command doesn't work with negative values.