wall mounted close control

[dannycool]

Can anybody recommend a manufacturer of wall mounted close control units with humidity control?
We have tried the Airedale CSS 32 concept and Denco's option but we are looking for something a little less expensive.

Thanks in advance
Danny

[Brian_UK]

Unfortunately I think cheap doesn't always go alongside the expression "close control."

[multisync]

http://www.marstair.com/close-control.php

[dannycool]

Unfortunately I think cheap doesn't always go alongside the expression "close control."

you can include "denco" with that!

[dannycool]

http://www.marstair.com/close-control.php

Thanks for the reply multi!
But the customer has specced a wall mounted unit due to the smallish heat load.
it appears Marstair only make free standing units

[martinw58]

the marstair units are wall mounted units

[michael7]

You could try an IMI, I have done it in a room using a Impact with an electric heater driven by a thyristir drive heater.

We continously ruu the unit and trim the temperature with the thyristor.

We maintain suction back presure by injecting gas via an EPR direct from the liquid line inot the suction down stream of the TX valve, this hold the space at +/- 1c.

The room humidity is a different matter.

Mike

[BritCit_Juve]

Contact HRP regarding the Mini Compact high wall mounted close control units.
They do top return front discharge full function units with electric heat and humidifier.
A 7kW ssensible system is around £6400 with a Marstair MCU+ condensing unit.
they do 4 models from 2kW to the 7kW
Brit

[BritCit_Juve]

I don't know if this is of any use but this is the mini compact range from HRP.
The original file was too large ...
They promised me a unit in three weeks so not exstock

[sinewave]

Bottom line though in most small business applications is price!


The first manufacture who could manufacture maybe a 'half way house' range which would sit between comfort units and CC units at a price premium of say 100% over an equivelent comfort model rather than the current 500-600% premium would do rather well me thinks!

[Greengrocer]

Haave been trying to interst a manufacturer in that concept for over 5 years with no takers. None of the big boys are interest cos there's not enough volume.

[BritCit_Juve]

The problem is that they are too specialist. they can't use original unit controls and can't use the original casing so they can't get the volume cost reductions.
IMI used to do a halfway house with their high sensible versions of their comfort cooling units - smaller condensing unit on the evaporator to lower latent coolin. Toshiba and others also allowed some limited flexibility in that way.
For humidity control though you start to need more 'complex' operation with simultaneous cooling and heating (try that on a heatpump) and adding moisture (one of the japanese model ranges does do this using condensate and a heater but I cant remember which!)
Horses for courses and the extra cost will still be cheaper than the third compressor change
Brit

[Greengrocer]

The problem is that they are too specialist. they can't use original unit controls and can't use the original casing so they can't get the volume cost reductions.
IMI used to do a halfway house with their high sensible versions of their comfort cooling units - smaller condensing unit on the evaporator to lower latent coolin. Toshiba and others also allowed some limited flexibility in that way.
For humidity control though you start to need more 'complex' operation with simultaneous cooling and heating (try that on a heatpump) and adding moisture (one of the japanese model ranges does do this using condensate and a heater but I cant remember which!)
Horses for courses and the extra cost will still be cheaper than the third compressor change
Brit

Would be interested to find out which Jap maker is offering this. Are they still available? Put your thinking cap on and if you remember let us know.
It is true though, the first company that can come up with a half decent 5/10kW sensible cooling high wall split with, hum, de-hum, re-heat, inverter CDU (for low start currents and close control) at the right price would clean up.

[airefresco]

The Daikin Ururu Sarara (or however you spell it) is basically a domestic wallmount, but does cooling, heating, de-hum and re-hum. But it´s probably not suitable for close control. It is aimed at purely at the domestic market, well here it is anyway.

[Greengrocer]

The Daikin Ururu Sarara (or however you spell it) is basically a domestic wallmount, but does cooling, heating, de-hum and re-hum. But it´s probably not suitable for close control. It is aimed at purely at the domestic market, well here it is anyway.

A possibility. But as you say it is a "domestic" system. Max capacity is only 3.4kW Sensible (UK) for size 50, pipe-run is limited to only 10m & the indoor has to be above the outdoor unit on an outside wall (back to back install).
Now, if someone could come up with a commercial version of this with larger capacities, longer pipe runs and some means of using the condensate as the feed for a built in infra red or adiabatic humidifier we could be "cooking on gas".
Doesn't even need a fancy indoor casing just a basic metal box will do (who cares what it looks like in a server room?). The Compact Air unit mentioned earlier in this thread is getting there but once again it's not got enough capacity and needs an a 1ph Inverter outdoor unit (soft start) to be really usefull.
Most of the small server rooms we see are "broom cupboards" and need a minimum 5kW sensible. Pipe runs are sometimes 40m + (which often dictates the minumum capacity unit that gets installed) and in many cases there's no 3ph power available.
It no wonder that comfort cooling splits get used for server rooms. We all know they're not the right tool for the job but there aren't any other options out there that tick all the boxes.

[BritCit_Juve]

Sorry for the delay.
The unit I was remembering was the daikin urur sarara. I had forgotton the limitations.
I agree that an ingerter is starting to be more and more a requirement.
Current technologies require the use of 'hardier' components for the close control units which HAVE to operate 24/7 throughout the year.
The comfort ranges aren't so hardy but we have all seen the installs wheere they have been using comfort cooling units for the last 10years with minimal problems.
the manufacturers are getting there but due to the limited market they are not going to put in the resources to develop one bearing in mind its nearly 20years since IMI dropped their Calder HiSpec ranges and we are only just getting back the units we require.
Brit