[Equest-users] DX units result in "Pump & Aux" energy us

Karen Walkerman kwalkerman at gmail.com
Wed Jul 23 15:02:19 PDT 2008

This is crankcase heat which defaults to 50 w.  Thanks for all the
responses!!  I still don't understand why there is more crankcase use in the
colder months, but I am all set for now.



On Wed, Jul 23, 2008 at 5:46 PM, Kevin <kevinjm5000 at yahoo.com> wrote:

> I believe this is crank case heating (SYSTEM:CRANKCASE-HEAT) which defaults
> to 50 Watts (0.050 kW) for PVVT with an on temperature (CRANKCASE-MAX-T) of
> 50. If you set CRANKCASE-HEAT to zero, I think this energy goes away.
> - Kevin
> --- On *Wed, 7/23/08, Karen Walkerman <kwalkerman at gmail.com>* wrote:
> From: Karen Walkerman <kwalkerman at gmail.com>
> Subject: [Equest-users] DX units result in "Pump & Aux" energy use
> To: equest-users at lists.onebuilding.org
> Date: Wednesday, July 23, 2008, 2:13 PM
> Hi All,
> I'm working on a project where I have a system type of "PVVT" specified.
> When I have air-cooled DX units specified, my "Pump & Aux" energy goes WAY
> up (about 4500 kwh are attributed to pumps and 19000 kwh attributed to
> something having to do with the DX units).  The SS-P cooling summary report
> shows some sort of energy use for each unit every month, even when there is
> no cooling load.  Curious thing, is that the highest loads are in the
> winter.  I always result in 37.6kwh used in jan, 33.6 in feb, etc.  I also
> ran a test module straight from the wizard with a PVV system.  The system
> size is much larger, and it still uses... 37.6 kwh in jan, 33.6 in feb (the
> other months there is a cooling load).  Any idea where this comes from or
> how to make it go away?  The DX units will be OFF in the winter.  It seems
> that the program is simulating some sort of heating for the DX unit.
> Any thoughts?
> Thanks,
> --
> Karen
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