HAI OmniPro II - OmniStat Question

[Vycor]

So heres my question... im using PC Access and id like to basically write something that

IF Thermostat is 75 or higher, turn thermostat on to 72 for 1 hour

Something like that... can't find anything that will check a thermostats temp as a trigger... any ideas?

 

[Steve]

I don't think you can use the temp as a trigger, just a condition. So, you could do something like:

Every X Seconds (Trigger, like check every 30 seconds or so)
AND IF Current Stat Temp > 75
THEN Stat Cool setpoint = 72

If you need to keep it there for one hour then you might have to use a timer set to 60 min and Put Hold on the stat when you start timer and when timer expires remove hold.

There may be better ways but that should work off the top of my head.

 

[Vycor]

I made something like this, which will probably work:

1.	EVERY 15 MINUTES
		AND IF IT Office CURRENT TEMPERATURE IS GREATER THAN 75 BY MORE THAN 1
			THEN IT Office COOL SETPOINT 70
2.	EVERY 15 MINUTES
		AND IF IT Office CURRENT TEMPERATURE IS LESS THAN 71 
			THEN IT Office MODE OFF

We have our thermostats set to manual mode, meaning they do not follow a day to day prgoram, whatever we put in, it sticks. This is for a client, at our office we have it set at 8am and then it sets higher at 6pm when everybodys gone (then again every 2 hours in case people stayed)

I used 75/70 as my set points... basically at 70 it stops and then it doesnt turn back on till 75. So the office is always 70-75... im not sure which is better, to have the system stay on longer to go from 75 to 70, or to have it kick on more as it normally would above 70.. i know it stops at 70 then might turn back on at 71 or 72, not sure how it works. Cooling for less time to drop less, or cooling for longer to drop more, not sure which math comes out better.

 

[ano]

You can trigger on a thermostat temp, but its not as easy or flexible as it should be. You can set a range of temps where the thermostat reports back secure or not ready depending if the thermostat is in or outside that range. For example, if you want to trigger when a thermostat is reading greater than 75 degrees, you can set the range to be something like 40 - 75. then when its 76 or above, the zone will be not-ready, under 76 it will be secure and you can trigger on that. Not the greatest or flexible solution, but if you just need to trigger on one temp, it works.

 

[Brian Yokum]

ano,

The temperature "range" method only works with temperature sensors that are connected to zone inputs. It does not work with Omnistat thermostats.

The best way to trigger off temperatures is to check periodically using "EVERY x SECONDS" as shown above.