3,000BTU water cooled condensers?

[Xeon th MG Pony]

Hey Does any one know of a good cheap source of 3000BTU/H Co-axial condensers?

Lately I've been building allot of small plants for some people here and due to it being a commercial environment We have decided that water cooled offers just far to many advantages and solutions then air could even hope to accomplish. Down side to the is so far the only readily available units are 6,000BTU and up that I can find. this is much to over sized for the application as most these plants only push 3,000BTU during pull down and hold at 1,186BTU @ -17.8C under normal usage! So even at 3,000BTU/h the sub cooling will be more then enough during the pull down cycle. Another item I've been trying to source is the V46AA-1C Head modulated flow control Valves, thus far for the larger units we have been using the V46AB-1C and they are fairly cheap to obtain ($100CAD or so).

Thanks for any assistance!

Here is a pick of a 6,000BTU 3/4Hp plant thats being retrofited to be water cooled and use R-134a

Water input is expected to be around 10 to 20C @ 5GPM max with condencing pressure held to 105psi. When don the plant will have a thermister on Input and out put of the heat exchanger to monitor the Dt of the coolant.

[star882]

Make them? Put some copper pipe in PEX, put refrigerant one way though the copper and water the other way through the PEX.

[Xeon th MG Pony]

Unfortunately that will be unacceptable in a reliability point of view and will not be accepted by any insurance authority. This is a proper commercial installation and as such must be don strictly by the book.

For my self I'd have used PVC and 1/4 Copper with a counter flow arrangement, but for company work it isn't as fun!

I could use a 6,000BTU/H but it is so over sized and costly for such an application. We have measured temps as High as 40+C at the roof of the restaurant which is where most of the condensing plants are located.

The unit in the pic is for a walk in cooler 8*8*7 running at a temp of 4C cut-in 3C cut-out and this will greatly reduce total internal heat load only leaving 4 full sized freezer cabinets that will need to be converted.

I appreciate the idea, but like I said, when it comes to regulations and reliability insurance and such it really takes the fun out of building custom stuff <_<