FCU Trane units

[xnetfly]

I am working on a apartment complex that uses one FCU per room. The FCU's are TRANE FCU's with chilled water coil and hot water coil and two 2-pos control valves.The control stat just shows setpoint temp, speed of fan and on/off. There is no swap over from heating to cooling at all on the stat. Here is my question. How does the FCU know when to cut the chilled water off and run the hot water and visa versa?? Is there a dead band set up? Anyone have any experience with the TRANE FCU's???? The model number is FCCB0401J.

Thanks love the site!

 

[imok2]

If you can't find any documantation then do this:1. set the stat on full cooling and take a temp reading, it should get cooler..say~55*f

2.set at on full heating and take a temp reading, it should get warmer say 90*f if of course the boiler is on If both settings respond then take a room temp reading and set the stat at that temp and if the stat is in caliration you should get no cooling or heating. Most stats have a way of setting the deadband but you need the mfg lit.

 

[xnetfly]

I plan on trying that today. Thanks for the input... Curious what the dead band might be though. It seems that the fan runs continously as well. That is an energy hog....

 

[blutfort]

Fan Coils have a few different control boards in them from Trane. They are also available with electromechanical controls.

If they have a microcontroller in them the default setup is for the setpoint on the thermostat to act as the cooling setpoint and the heating setpoint is two degrees cooler.

If they have the micro board in them that I think they have then you can change the fan mode (Auto or On) with a resistor across a couple of the terminals.

All of the parameters of the unit are adjustable through a software / hardware program called everyware or rover (depends on age of unit).

If you could get a model number off the control boards I could tell you more.

Good luck.