[Equest-users] Cooling Coil Error

[Jonathan Curtin]

Jason,

My bet is that you have a pretty high dT across the fan (operating at >
5") causing your actually leaving air temperature off the cooling coil
to be less than 50F. I am pretty sure (although it has been a while)
that you can avoid this error and still maintain the same conditions if
you implement a reset schedule on your air temperature (even if you
don't actually reset it), rather than using the cool-min-temp only.

Regards,



  Jonathan M. Curtin, EIT, LEED(r) AP
  Mechanical Engineer

  


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [
mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jason
Wendel
Sent: Thursday, December 17, 2009 11:50 AM
To: 'equest-users at lists.onebuilding.org'
Subject: [Equest-users] Cooling Coil Error

I have an error that says:

In S1 Sys (VAVS), Cooling coil leaving temperature must be at least 6F
higher than entering water temp.

I have 44" entering CHW with a 12 degree delta T.  Cold Air for the
system is set to 54F.  I thought with a chiller with a 12 degree delta T
there shouldn't be the above error.
Any ideas?

-Jason
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