Re: Urgent help required: Star vs Daisy chain wiring for aircon control

["christopher purves" <CHRIS_PURVES@xxxxxxx>]

Some docs here

http://www.daikinukwest.co.uk/documentation.aspx

files->operation manuals ->vrv -> EN-OM-I-touch controller

not sure its much help and it need IExplorer to browse I think.

C


>From: "Frank Mc Alinden" <frankmc@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: <ukha_d@xxxxxxx>
>Subject: Re: [ukha_d] Urgent help required: Star vs Daisy chain wiring
for
>aircon control
>Date: Wed, 28 Sep 2005 22:19:01 +1000
>
>Have you got a link to a website with the docs on it for the  stats ??
>
>Frank
>
>----- Original Message -----
>From: "christopher purves" <CHRIS_PURVES@xxxxxxx>
>To: <ukha_d@xxxxxxx>
>Sent: Wednesday, September 28, 2005 10:17 PM
>Subject: Re: [ukha_d] Urgent help required: Star vs Daisy chain wiring
for
>aircon control
>
>
> >
> > I wish I could find out - I am digging in their docs.
> >
> >
> > Chris
> >
> >
> >>From: "Frank Mc Alinden" <frankmc@xxxxxxx>
> >>Reply-To: ukha_d@xxxxxxx
> >>To: <ukha_d@xxxxxxx>
> >>Subject: Re: [ukha_d] Urgent help required: Star vs Daisy
chain wiring
>for
> >>aircon control am I screwed
> >>Date: Wed, 28 Sep 2005 22:12:52 +1000
> >>
> >>Hi Chris
> >>             Can you confirm  that the communication is rs 485
???....If
> >> so
> >>then it  should be ok to star or daisy chain ,although rs485
specs state
> >>daisy chaining......
> >>
> >>Frank
> >>----- Original Message -----
> >>From: "christopher purves"
<CHRIS_PURVES@xxxxxxx>
> >>To: <ukha_d@xxxxxxx>
> >>Sent: Wednesday, September 28, 2005 10:07 PM
> >>Subject: [ukha_d] Urgent help required: Star vs Daisy chain
wiring for
> >>aircon control am I screwed
> >>
> >>
> >> > OK the story so far:
> >> >
> >> > We have had a whole house Daikin air conditioning system
>installed(hot
> >>and
> >> > cold). 8 indoor units connected to 2 external units (4
internals to
> >> > each
> >> > external). We opted for a touchscreen to control this
setup as it
>could
> >> > provide timing to turn units on and off along with
themostats and so
> >>forth
> >> > so it behaved much like a convetional heating system.
> >> >
> >> > Each unit in the chain (including external units and the
touchscreen)
> >>has
> >> > an
> >> > f1 and f2 signal connection.
> >> >
> >> > Originally Daikin told our installer to wire as a 'star'
back to the
> >> > touchscreen location which required a single 2 core
cable to each
> >> > indoor
> >> > and
> >> > outdoor unit back to the touchscreen which of course
they did. In
> >> > effect
> >> > join all f1's together and all f2's together and attach
to f1 and f2
>on
> >> > the
> >> > trouchscreen.
> >> >
> >> > However when speaking to Daikin today, Daikin are
claiming the
>internal
> >> > units must be wired in a daisy chain (one to the next).
4 units daisy
> >> > chained into 1 external unit (so 2 setups like that) and
then both
> >> > external
> >> > units back to the touchscreen (again f1's to f1's, f2's
to f2's).
> >>Clearly
> >> > the existing wiring does not support this method as
there are not
> >> > enough
> >> > cores but, I cannot for the life of me understand why a
star and a
> >> > daisy
> >> > chain should be any differrent ? Electrically it seems
the
>connections
> >>are
> >> > the same.
> >> >
> >> > I would also point out that each unit has an address
settable by a
>four
> >> > input dip switch.
> >> >
> >> > Can we just ignore their comments and wire it a as a
star ?
> >> >
> >> > Certainly CBUS can be wired as either.
> >> >
> >> > Anyone ?
> >> >
> >> > Help greatly appreciated. The installer and I are
tempted just to try
> >> > it
> >> > but
> >> > given the cost of the equipment we are a little nervous.
On the
> >>otherhand
> >> > given that all the decoration is now finished it will
cost us
>thousands
> >>to
> >> > rewire.
> >> >
> >> > Ta
> >> > Chris
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Yahoo! Groups Links
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >>
> >>
> >>Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
>
>