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Old 05-08-2012, 03:39 PM   #1
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Trane system continious air flow problem?


Had a trane system installed in the other house now, it is supose to have 24x7 continious air flow, but it's not!

its a trane xc95m communicating system with a xl20i ac unit and a TCONT900 thermostat, so a complete communicating system with a cleaneffects air cleaner also in communicating mode.

the continious air flow is set to 40% when no calls are going..

it will run for a while, then it seems it randomly just goes off... the thermostat says Fan "on" but the blower is off.. i can turn the furnace off (power cycle at the switch) and go back on and its still off...

the programmable schedule on the thermostat has all 7 days and all 4 periods of the day set for the fan to be on

the thermostat says the fan is on, but its not

when a heat or cool call comes the blower starts up...

when in heat only mode it seems to work most of the time, when in cool only mode this seems to happen the most in auto (heat/cool switchover) mode it happens a good bit too...

any ideas?

the entire system is voltage + data line, so it's not the wires messed up, its only 2 to the AC, 3 to the thermostat, and 3 to the air cleaner

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Old 05-08-2012, 05:09 PM   #2
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Trane system continious air flow problem?


You must likely need to program the tstat. The tcont900 is like the Honeywell IAQ and I am pretty sure it has a function for continous fan mode. You can also just turn it on to "Fan ON". Also you said that there is only 2 wires out to the xl20i? Is this a 2 stage unit? It should have maybe more like 4 wires in total. But I am not 100% percent sure. Maybe one of the pros here can comment on that. Check your manual your installer probably left with you for more info.

edit:
I found the manual online.

http://www.butcherdistributors.com/I...0installer.pdf


Last edited by kilosos2; 05-08-2012 at 05:19 PM.
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Old 05-08-2012, 05:45 PM   #3
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Trane system continious air flow problem?


make sure the thermostat is fully on its base plate. other then that, i have no idea.
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Old 05-08-2012, 06:00 PM   #4
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Trane system continious air flow problem?


check the dip switches inside the air handler..
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Old 05-08-2012, 06:32 PM   #5
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Trane system continious air flow problem?


Quote:
Originally Posted by ggold View Post
check the dip switches inside the air handler..
there are no dip switches on the xc95m, it's all on a LCD screen
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Old 05-08-2012, 06:34 PM   #6
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Trane system continious air flow problem?


Quote:
Originally Posted by kilosos2 View Post
You must likely need to program the tstat. The tcont900 is like the Honeywell IAQ and I am pretty sure it has a function for continous fan mode. You can also just turn it on to "Fan ON". Also you said that there is only 2 wires out to the xl20i? Is this a 2 stage unit? It should have maybe more like 4 wires in total. But I am not 100% percent sure. Maybe one of the pros here can comment on that. Check your manual your installer probably left with you for more info.

edit:
I found the manual online.

http://www.butcherdistributors.com/I...0installer.pdf
the continious on fan mode is set, its currently set to run at 40% of the max speed, and right now it is set to fan on, and the fan is off... but when a heat or cool call come in the fan comes on.. the xl20i is two stage, but it only has 2 wires, its a communicating model, it only needs a common and a data wire (well it also has the 30 amp 240v line too, but i'm not counting that)
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Old 05-08-2012, 06:38 PM   #7
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Trane system continious air flow problem?


ok this is getting more confusing, I just turned the system from Cool to Off and the blower came on
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Old 05-08-2012, 06:58 PM   #8
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Trane system continious air flow problem?


is it programed to match outdoor unit ?
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Old 05-08-2012, 07:15 PM   #9
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Trane system continious air flow problem?


Quote:
Originally Posted by ggold View Post
is it programed to match outdoor unit ?
not sure what you mean, the entire system is auto learning via the communicating interface
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Old 05-08-2012, 07:21 PM   #10
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Trane system continious air flow problem?


you should be able to scroll through the menu on the screen, it should ask for condensor unit model
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Old 05-08-2012, 08:12 PM   #11
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Trane system continious air flow problem?


Quote:
Originally Posted by BlueBSH View Post
ok this is getting more confusing, I just turned the system from Cool to Off and the blower came on
Maybe thats how the continuous are flow works? Try contacting Trane. For sure there is a setting to do this. The other only thing you can do is set the Fan "ON" mode.
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Old 05-08-2012, 08:49 PM   #12
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Trane system continious air flow problem?


contacting Trane......... that made me laugh....
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Old 05-08-2012, 10:17 PM   #13
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Trane system continious air flow problem?


Are you using a schedule? If so, make sure all periods in your schedule on every day are set to fan ON.
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Old 05-09-2012, 10:03 PM   #14
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Trane system continious air flow problem?


figured it out after reading the whole installer manual....

read something about humidity control with the blower, turned it off and the blower never turns off now guess this only is supose to happen when cool has been on in the past x amount of time, its to stop water on the coil from being evaporated back into the air... why it turns it off when the blower says its on, guess thats a stupid honeywell design, but at least now it makes some sense
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Old 05-10-2012, 07:12 AM   #15
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Trane system continious air flow problem?


Quote:
Originally Posted by hvactech126 View Post
Are you using a schedule? If so, make sure all periods in your schedule on every day are set to fan ON.
yep all where on, and the main system fan setting was also on nothing was on circ or auto

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