Unfortunately I don't have a good way to get outdoor ducts to the
location. The Building HVAC has this setup, but when it's cold, they
don't pull in outdoor air so it just recycles the already hot indoor
air. That's why I need extra cooling. The Building HVAC mostly handles
it fine over the summer, but in the winter is when I have heat problems.
On 8/15/2018 11:39 AM, Dave wrote:
What about doing something to the outside ducts to allow outside air
below 40deg to be pulled to inside for cooling and
not use compressor at all. We have this setup for our data room and
saves tons on power consumption.
On 08/15/2018 10:14 AM, ch...@wbmfg.com wrote:
Ah, yes, that’s it, crankcase heater. I was close.
*From:* Aeron Wireless
*Sent:* Wednesday, August 15, 2018 9:10 AM
*To:* af@af.afmug.com
*Subject:* Re: [AFMUG] Low Temperature AC
I've seen two different kits. One, more common in refrigeration, is a
crank case heater to keep the oil fluid. The other (more common in
HVAC) controls (reduces) the condenser's fan speed to prevent it from
(literally) freezing up.
On Wed, Aug 15, 2018 at 11:07 AM <ch...@wbmfg.com> wrote:
I don't know what is different but I have been faced with the
same thing.
It seemed to me that it had something to do with the compressor
starting
when super cold.
Perhaps different oil in it or something.
-----Original Message-----
From: Nate Burke
Sent: Wednesday, August 15, 2018 8:56 AM
To: Animal Farm
Subject: [AFMUG] Low Temperature AC
I'm looking to get a Mini Ductless Split system to put in a small
server
closet. Over the winter our outdoor temps get down to the -10 to
-20F
range but heat is still generated in the middle of the building.
Looking at the Mitsubishi 'P' Series "Mr Slim" Lots of data
sheets talk
about the 'Ultra low ambient cooling option' Where the outdoor unit
will work down to -40F. But I have not been able to find a
single thing
that says what the 'Ultra Low ambient cooling option' actually is, or
any part numbers for it.
The product catalog has a page dedicated to 'Low Ambient Cooling
System'
that operate to 0F and 'Ultra Low Ambient Cooling Systems' that
operate
down to -40F. But again, no part numbers are listed.
http://www.mitsubishieng.ca/en/hvac/p-series/operation.html Lists
a -40f
Option.
https://www.mitsubishipro.com/products/p-series/outdoor/single-zone-cooling-only
Lists a -20F option.
Has anyone had experience with these? It seems like it's more
than just
a wind baffle on the compressor, there are extra line heaters and
filters that are needed? My Normal HVAC Guys are used to working
residential/small business, so the need for cooling over the
winter is
hard for them to understand. Other HVAC guys that I've found
that know
about the P-Series only know that the spec sheet says cold weather
operation, but nothing beyond that.
Any Tips or different systems to look at?
Nate
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