[Equest-users] Difficulty with Cooling Tower

Matthew Dubrovich mdubrovich at emcengineers.com
Mon Oct 26 08:03:53 PDT 2009

Hi Kimberly,

You need to have at least one water cooled chiller attached to the condenser water loop in addition to the water-side economizer to get rid of that error message.  Add a dummy water-cooled chiller and schedule it off at all times (use Equipment Control and have the air-cooled chillers meet the entire load - the fake water-cooled chiller will never turn on but the economizer will operate whenever possible) and verify it is not running through the hourly reports.  The error should disappear and you'll get free cooling from the economizer.

Matt Dubrovich, P.E.

EMC Engineers, Inc.
Making buildings work.  Better.
(303) 974-1217 - direct
(720) 279-4426 - mobile
(303) 974-1239 - fax

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kimberly Killian
Sent: Friday, October 23, 2009 10:20 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Difficulty with Cooling Tower

Good Afternoon all,

I am trying to model a cooling tower but have not been able to make it work. I am running the model in 3.63b. The model will run if I attach the condenser loop directly to one of my chillers, but when I attach the water economizer to the condenser loop, as instructed in the documentation, I get an error message that their is no load on the condenser loop.

Has anyone had any success getting this type of system to work? The documentation is light on this topic. Any and all assistance would be greatly appreciated.

Kimberly Killian
Northern Architects, Inc.
207 King Street Suite 3
Burlington VT 05401
T: 802-658-1953
F: 802-658-2975
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