I've always wondered about doing that. Was the honeywell controller an
off the shelf product or did you have to do something custom?
On 9/28/2015 1:56 PM, Keefe John wrote:
Cut a duct into the roof and bring in outside air when the temperature
is cold. We have a honeywell controller which controls dampers and
decides whether it is more efficient to bring in outside air or cool
the inside air.
On 9/28/2015 12:43 PM, Nate Burke wrote:
I'm looking to add backup cooling to a small computer room,
<200sqft. Primary cooling is via a RTU (roof top unit), but I can't
put that on our generator (240v genset vs 480v RTU). I'm thinking
like a 2 or 3 ton Split system would be perfect. Problem is we're in
the midwest, and outdoor temperatures can drop to 0 or below over the
winter. Looking at the split systems, nobody seems to know if they
will work for cooling with outdoor temperatures that low. Online
searching has yielded results for Heat Pump units, where they want to
Heat with low temperatures. Has anyone had experience with Split
systems cooling with low outdoor temperatures? Are there special
compressors built for that use? I have heard about putting a
thermostat on the fan line to cut out the compressor fan below
ambient X temp, or shrouding the compressor to keep wind from blowing
through it. But have not been able to confirm from any HVAC
contractor the validity.
This would only be for backup use, RTU Failure, or power outage. The
RTU is handling the load normally without an issue. My Current
Backup is Movincool units, but I want to reclaim the floor space, and
make it more permanent.
