<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Hello Guys,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I have encountered a problem in which when I assign a roof top heat pump unit for a zone and run a simulation, eQUEST start the simulation and then stop in the middle and close and I have to open it again. However, when I delete the roof top unit and assign for the same zone chiller/boiler system that is used for the other zones in the same building, it works and complete the simulation.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Does anybody can advise what is the problem and how to solve it?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thank you</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Ahmad</div></div></body></html>