Refrigerologist
09-02-2017, 10:54 PM
Hi all,
We have a building that is operating a large number of R407C EVH15 to 24 ceiling void units. Many of these are operating as master and slave. Quite a few are operating with different capacity versions operating in this manner, e.g. a size 21 and a size 15 are operating from a single controller with the dip switch on the smaller unit(s) being set as slave.
Clivet have introduced a new R410A EVH**X units, but these are only available up to size 17.
We have a couple of size 15 units that have failed and we wish to install new replacements. The problem is that these 2 units operate in a common ductwork system and have size 21's blowing though the same supply air duct.
Clivet UK have told us that it is not possible to 'link' the old units and new units as master and slave. They have suggested that we separate the units and operate each from individual remote controllers. This is not going to be possible due to the common ductwork arrangement and the possibility of each controller being in a different mode.
The layout of the ductwork does not allow for easy separation as each Versatemp blows into a plenum at the start of the ducting and this does not split until quite a distance into the room. The worst of it is the client carried out a refurbishment of the building, but did not upgrade the A/C. Removing ceilings to install new ductwork is not going to be popular or likely. The offices are now fully occupied.
I have yet to see a wiring diagram or full set of installation instructions, so I do not know if what I have been told is categorically correct. Hopefully, if it is true there may be a work around, by installing additional relays and volt free contacts. The alternative is to scrap some 8 year old units and replace fully serviceable units in groups of 2 or 3. Obviously my client isn't a happy bunny at the thought of that.
Cheers in advance for any ideas.
We have a building that is operating a large number of R407C EVH15 to 24 ceiling void units. Many of these are operating as master and slave. Quite a few are operating with different capacity versions operating in this manner, e.g. a size 21 and a size 15 are operating from a single controller with the dip switch on the smaller unit(s) being set as slave.
Clivet have introduced a new R410A EVH**X units, but these are only available up to size 17.
We have a couple of size 15 units that have failed and we wish to install new replacements. The problem is that these 2 units operate in a common ductwork system and have size 21's blowing though the same supply air duct.
Clivet UK have told us that it is not possible to 'link' the old units and new units as master and slave. They have suggested that we separate the units and operate each from individual remote controllers. This is not going to be possible due to the common ductwork arrangement and the possibility of each controller being in a different mode.
The layout of the ductwork does not allow for easy separation as each Versatemp blows into a plenum at the start of the ducting and this does not split until quite a distance into the room. The worst of it is the client carried out a refurbishment of the building, but did not upgrade the A/C. Removing ceilings to install new ductwork is not going to be popular or likely. The offices are now fully occupied.
I have yet to see a wiring diagram or full set of installation instructions, so I do not know if what I have been told is categorically correct. Hopefully, if it is true there may be a work around, by installing additional relays and volt free contacts. The alternative is to scrap some 8 year old units and replace fully serviceable units in groups of 2 or 3. Obviously my client isn't a happy bunny at the thought of that.
Cheers in advance for any ideas.