Do you have any model numbers you'd be willing to share? Did you set
the Programming, or did an HVAC Contractor set it?
On 9/28/2015 1:31 PM, Keefe John wrote:
The outside sensor is actually an enthalpy sensor which takes into
consideration humidity and temperature. If the air outside is cool
but really humid it won't bring it in.
On 9/28/2015 1:25 PM, Nate Burke wrote:
Do you run into condensation/humidity problems with that cold of air
coming in?
On 9/28/2015 12:58 PM, Adam Moffett wrote:
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.
