pinging mark beiser

[t3]

mark, in this thread (http://hvac-talk.com/vbb/showthread.php?threadid=106058&pagenumber=2) you mentioned a way to connect DH on XL1600

please see the attached 2 images as I can't see BK on the Trane XL1600

http://i6.tinypic.com/1zbqxdv.jpg

http://i6.tinypic.com/1zbqxyu.jpg

this is a new install completed today

[mark beiser]

The 2nd picture is of the fan control board, that is the one you want.

The single row plug just left of center on the lower half of the board is the one you need to look at.

The 2nd pin from the top is BK, it is the first wire in the plug though.

Have your installer follow that wire to where it ends, it will be connected to a wire from R. It needs to be separated from R and and connected to the thermostat wire that goes to the dehumidification terminal on your thermostat.

I cropped this out of the diagram in the Installers Guide for the XL1600 heat pumps. It shows what each of the pins sticking up off the board is for.
http://home.comcast.net/~mbeiser/ACstuff/1600BK.JPG

All equipment I have seen that uses the GE ICM motors has such a terminal, but sometimes you have to be a little creative about getting access to use it. ;)

Are you the person I spoke to on the phone a few weeks ago?

[Edited by mark beiser on 07-07-2006 at 10:41 PM]

[t3]

worked perfectly, thanks.

[mark beiser]

Originally posted by t3
worked perfectly, thanks.


Great!

Now if we can just talk Trane into documenting the feature on the heat pump version of the XL1600.

The gas heat versions actually has instructions for using a humidistat for dehumidification.

[t3]

I do have one follow-up question on this, the docs for the thermo state the following:

http://img378.imageshack.us/img378/9964/dh9ut.jpg

thus, I have items 49 and 50 On in the programming but now I wonder if 50 should be Off to cut power to BK if dehumidification is needed? I think it's correct as ON/ON but just checking to make sure

Item 51 is Off as it should continue to cool if dehumidification is needed

[mark beiser]

I havn't looked at that thermostat, specifically, but 49 should both be off, unless the thermostat is also running a compressor during an "independance demand to dehumidify".

50 should be off. No control voltage to BK, during a call for cooling, will cause the blower speed to drop to 80% of whatever it would normally be.

Is there an option in there somewhere for the thermostat to cool below the set temperature when there is still a demand for dehumidification after the set temp has been reached?

[t3]

ok, Item 50 Off means of course "DH relay is normally open when RH is above DH set point"

no, there is no option to cool below set temp if still demand for DH but see Item 51

you didn't confuse with Item 48 which is on the picture but does not apply here as it's only for humidifier and thus is always Off in this situation?

Normally the settings would be OFF, ON, ON, OFF or they would be OFF, ON, ON, ON

but as you suggested, it's now OFF, OFF, OFF, OFF

thanks.

[mark beiser]

That should do the trick for proper use of BK for dehumidification.
On the blower control in the unit, make sure dip switches 5 and 6 are both on. This enables the Comfort-R ramping, wich helps with humidity control.

Option 49 and 50 would only need to be turned on if there was a dehumidifier installed. The DH terminal of the stat would be used to turn the dehumidifier on and the stat would turn the system fan on at the same time.

[t3]

am considering switching the system thermostat to a White-Rodgers 1F95-391

if I'm reading the installer/user manuals correctly, this would energize Y/Y1 (OPTM DHUM) if RH% is 2% above setting, something the current thermo won't do.

mark, have you used the 1F95-391 on the XL1600 or another type of thermo? any other comments before I make the swap?