2 units 1 stat

[ACFIXR]

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

[Control Man]

Take a look at this http://jacksonsystems.com/view_product/25356

[Helioson]

Wow, for a minute I thought this might be a twisted version of a shock video or something.

[ACFIXR]

Take a look at this http://jacksonsystems.com/view_product/25356

Thanks for the link.

[perfectionist]

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.

[ACFIXR]

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?

[ACFIXR]

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.

I would possibly do this on my own stuff. Both of these jobs are going to receive a high level of scrutiny therefore I am going to do whats referred to as "current industry standard"............. or better.

[ACFIXR]

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?

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.