[Equest-users] Heat not working!

[Sheila]

Good morning Terry-

 

One very common problem that causes unmet load hours during heating is not using a minimum OA schedule to eliminate OA during unoccupied times.

 

Also, you should check your fan and heat temperature schedules for consistency; i.e. for each hour that has an occupied temperature setting, the fan must be set to "1".

 

In addition, if using night set-back, you should also use an optimum start for 2-3 hours before occupancy to bring the temperature back up to the occupied setting in smaller increments.  Using optimum start affects both the temperature schedule and the fan schedule.  And, the min OA schedule should have a "0" during any optimum start hours so that no outside air is brought in while bringing the temperature back up to occupied settings.  Keep in mind that a zero in the min OA schedule will disable the economizer.  If economizer use is desired, the unoccupied hours should be set to 0.0001 to limit the OA when not desired but still allow the economizer if conditions are favorable.

 

Hope this helps.

 

Have a nice day.

 

Sheila Sagerer

Energy Engineer, EIT, LEED AP

Energy Opportunities, Inc, a 7group company

Phone: 717-880-9069

www.sevengroup.com

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Terry Budd
Sent: Monday, May 10, 2010 8:58 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat not working!

 

All,

 

I'm modeling a building and for some reason I can't get the heat to turn on. The building is a VRF system - we are tricking a heat pump system into a VRF system per BSUG directions (attached).

 

I've attached the model file. Can someone take a look and see what I did wrong?

 

Thanks,

-Terry

 

Terrence W. Budd, P.E., CPD, LEED AP

 

Lee S. Good Engineering

10483 Cleveland Ave NW

Uniontown, Ohio 44685

Phone: 330.494.1574  Fax:330.494.1567

ü Please consider the environment before printing this e-mail.

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100510/8d30f5e1/attachment-0002.htm>