see the wiki entry.

bells are generally much more substantial than chimes - in churches for example we talk about bells

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Note added at 10 mins (2008-08-28 12:16:41 GMT)
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unless the thing being installed is a carillon - this term is used in English to describe a very large musical instrument that includes a large number of bells see the following link: http://en.wikipedia.org/wiki/Carillon

In this case it appears that it is going to be a free-standing set of bells --i.e., essentially a musical instrument consisting of bells.

Technically (according to the O.E.D. and the Grove Dictionary of Music) a CARILLON is

‘A set of bells so hung and arranged as to be capable of being played upon either by manual action or by machinery’ (Grove).

Which would also apply to a set of bells in a church tower --but there is no such church tower in your example, I assume.

So, it's a question of a carillion, like this one not far from where I sit as we speak:

http://entertainment.webshots.com/photo/2763376090059138099B...

http://www.bloomingpedia.org/wiki/Arthur_R._Metz_Memorial_Ca...

Nothing there but bells, in a freestanding tower.

"Chimes" doesn't really fit here:

CHIME

2. a. An apparatus or arrangement for striking a bell or set of bells so as to make it or them ‘chime’ or emit a musical sound.

b. spec. (Usu. in pl.) Such an arrangement used as a door-bell.

3. Hence, A set of bells in a church tower, etc., so attuned as to give forth a succession of musical notes, or to be capable of playing tunes when thus struck, or when slightly swung.... Applied also to the small set of hand-bells used in the R.C. Ch. service; the set of bells with their strikers in an organ or musical box, etc.
4. The series of musical sounds, or tune, played on such sets of bells when struck in succession.