Dx coil control hell

[Contactor]

Hello

Can anyone recommend a suitable control strategy / interface / controller for a DX coil on the supply air of a heat recovery unit.

The heat recovery unit has no control output or input of it's own (for the coil) and all the heat pump manufacturers i've looked at so far - MItsu, MHI, Daikin, Hitachi - can only supply an interface between a controller and the heat pump unit.

So i'm looking for a controller or control strategy that we can use to bring on both the air handling unit and also the heat pump for heating / cooling depending on the space temp.

The Mitsi Electric PAC-IF012B-E looks like a suitable interface and the expansion is already on the outdoor unit which will help us out, but it still requires a controller, i'm trying to avoid making up a panel.

Can anyone recommend something?

Thanks

[Brian_UK]

We have on one site an air handling unit with DX coils fitted that are served by individual Daikin condensing units.

Each coil has the PCB and remote controller from an indoor unit and it seems to work OK.

[frank]

Have you looked at the Mitsubishi Alpha series http://uk.rs-online.com/web/c/automation-control-gear/plcs-hmi-data-acquisition/logic-modules/?searchTerm=mitsubishi+alpha&sort-by=default&sort-order=default&applied-dimensions=4294571510&lastAttributeSelectedBlock=4294574527

We have used these in the past. It is a simple process to design your own control logic using the software http://uk.rs-online.com/web/p/logic-modules/4433864/?searchTerm=mitsubishi+alpha+software&relevancy-data=636F3D3126696E3D4931384E44656661756C74266C753D656E266D6D3D6D61746368616C6C7061727469616C26706D3 D5E5C442B5C735C442B2426706F3D3926736E3D592673743D4B4559574F52445F4D554C54495F414C504841267573743D6D6 9747375626973686920616C70686120736F6674776172652673633D592677633D4E4F4E4526
You can download the software from the Mitsi controls website though, don't buy it. You can download a Demo version here http://www.mitsubishi-automation.com/frame.php?file=products/software.html&PHPSESSID=k0mf85ufsefinjd37tbrgieca0

[Contactor]

Brian, I've looked at the Daikin PAC-IF012bE which they supply with the condensers for third party DX coils but I still think it needs a controller. I've also seen local controllers for Daikin condensers but the whole site was run of a huge panel on BMS, are you saying it can be done solely from the controller, presumably with sensors on the supply and return air? That would be ideal.

Frank, that might be the sort of thing we end up using, i'll have a closer look at RS, I think we need dc ouputs for cooling on / off and fluctuating voltage for capacity control.

Many thanks

[stufus]

All the big name manufacturers do kits for AHU applications you basically buy a suitable duty outdoor unit and the control gear from an indoor unit ,Hook it all up like a big split system add a split controller and away you go.
Plus they all do various control expansion kits to cater to just about any taste.
Happy hunting.
Cheers
Stu