Understanding

[Airconman]

Hi

Can anyone give the the meaning of air on/off temp please.

New in the game !

Thanks

[nh3wizard]

Just as the says: air on at a certain temperature and air off at a certain temperature.
You want an area to be 40 degrees, so you might want the unit to turn on at 42+ degrees and turn off at 38 degrees, just an example

[TRASH101]

air on = condition of air before being conditioned
air off = condition of air after conditioning

[sinewave]

Just as the says: air on at a certain temperature and air off at a certain temperature.
You want an area to be 40 degrees, so you might want the unit to turn on at 42+ degrees and turn off at 38 degrees, just an example




:confused:




I'm with Trash! :rolleyes:

[nike123]

As others said above, and could be few more things. Put that in some context if you want precise answer.

[nh3wizard]

:confused:




I'm with Trash! :rolleyes:

Why so confused? I guess it all really depends on what kind of system you are working and the controls they use. This is why I think its sometimes better just to keep my mouth shut.

[The Viking]

Hey,

FANTASTIC!

We have found another difference between the US and the UK English.

Here in UK, we tend to use Trash's definition of air on/off. (remember, it's not only temperature, it's also valid for filtration/humidity and so on).
Here we tend to call the control parameters "set point" and "differential" or alternatively "upper" and "lower" control limits or "cut in" and "cut out".

But as the English language travels around this little rock, small minute differences appears, much like "Chinese whispers".

Peace and love everybody...

[US Iceman]

When the terms "air on" & "air off" are used I take these to mean the temperature of the air entering the coil (air on to the coil) and air temperature exiting the coil (air off of the coil).

In the above any other reference could be substituted (humidity, wet bulb, etc.).

As Viking says, the definitions are a problem depending on locality. I have seen different terms used for the same thing here in the US also. I think it depends on what the person grew up with or is exposed to at work.

[TRASH101]

The reason for using "condition" in the above statement is because we are ultimately interested in the differential caused by change to, in this case air, to any of its properties which includes everything from energy transfer, filtration to flow dynamics etc.

Hopefully this clarifies my applied definition:D