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Thread: 2 units 1 stat
01-26-2013, 07:36 PM #1
2 units 1 stat
I could use some advise. How can you control 2 units with 1 stat?
I have 2 situations, one is a classroom building that only has single phase power.
Classroom:PE designs system with 1 supply duct with 2 Trane wcz048 heat pumps. Each has a 2 stage compressor.
How would you control these units? This equipment will be tied into the schools EMCS.
The second situation is a residence with 2 units serving a great-room with walls of glass.
It would be simple enough to twin the furnaces but I would like to stage the single stage condensers with a single control instead of adjusting set points.
Your suggestions would be greatly appreciated
01-26-2013, 10:23 PM #2Regular Guest
- Join Date
- Jul 2001
01-26-2013, 11:23 PM #3
Wow, for a minute I thought this might be a twisted version of a shock video or something.
01-27-2013, 12:21 AM #4
01-27-2013, 07:51 AM #5Professional Member
- Join Date
- Mar 2010
- Rochester, NY
You could also install a 2H/ 2C stat and a seperate control transformer and wire one 1st stage and the other 2nd stage. I have a system like this and I run continus blower on both to keep temps even.
01-27-2013, 09:39 AM #6
After reviewing the Jackson kit TK-400. It appears that it would be the way to go for the resi install with 2 units with 2 seperate supply ducts and standard blower motors. With the classrooms however these units are variable speed blower motors and the install guide says not to use the TK-400 with vs motors. I wonder why?
01-27-2013, 10:06 AM #7
01-27-2013, 10:08 AM #8
Variable speed motors and twinning:http://hvac-talk.com/vbb/showthread....1#post12832611
something is wrong with me, i am answering my own post's.