[Equest-users] Error - System Type 8 - VAV or PIUs.

Jenny Zhang jenny.zhang at arup.com
Thu Feb 21 18:27:04 PST 2013

Hi Kushagra,
I think it is because a PIU or VAV has a higher fan temperature rise than fancoil.
Could you send a screen cut of the air side system cooling setting.
We could know detail about this error.


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kushagra Juneja
Sent: 2013年2月22日 0:00
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Error - System Type 8 - VAV or PIUs.

Dear all,

There is an error that has come up while simulating a 6 lakh sq. ft. bldg.

"cooling coil leaving temperature must be at least 6F higher than entering water temp."

The CHW temp is 44 F and I have tried varying the zone supply temperature from 52 to 60 F. But no luck. The air side system here was PIU or VAV.

However, when I model the same with an FCU at the air side. No error appears.

Any clues why such strange behavior and how to resolve it?

Thanks in advance


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