'Close-Control'?

[Youssef]

Can i get some of your definitions of 'Close-Contol' systems/technology/market etc.

[The Viking]

"Close control" or "full function" units are commonly seen in computer/communication/IT rooms.

Normally they would be able to:
Cool (obviously)
Humidify
De-humidify
Heat

[Lowrider]

CCU's can be dx or with cooled water from a chiller.

Most of them, when dx,have all the components indoor, such as control, compressor etc. and only a condensor outside.

For an example, check: http://www.trane.com/webcache/rf/com...4_08012002.pdf

[Youssef]

...thanks for the posts.
is there a large demand for skills on these systems as IT becomes more & more important to businesses?
what companies are established/big names in this field & whats gases commonly used?

[Lowrider]

Don't know about the UK, but in Holland just having STEK is enough.

In Holland the bulk is Trane, Stulz, York and Liebert, as far as I know.

Most of them use R407c on the new ones, the older ones use R22.

[Youssef]

Thanks Sanderh.
What is STEK?
do these systems have coils against/inbetween sever blades? or more traditional 'AC' space cooling?

[Lowrider]

STEK is something like a guilds diploma in the UK, that one has to have in Holland to work on refrigeration equipment.

The ones I work on all are AC systems, where the air is "sucked" away at or above the ceiling, is cooled in the CCU and blown under the floor and goes trough the racks.