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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><b><span style='color:#1F497D'>Trevor, <o:p></o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>If we understand you correctly, your Zone HVAC Group diagram should look like this (note that the heating coil name references a Gas heating coil and that the off-page reference says ‘Gas’):<o:p></o:p></span></p><p class=MsoNormal><img width=957 height=491 id="Picture_x0020_1" src="cid:image002.jpg@01D10343.16A1F520"><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The error message you cite seems to indicate that the off-page reference _<i>might</i>_ say ‘HW’ instead. If this is the case, then you have mistakenly selected a HW heating coil which requires a cross-loop reference to a HW loop. <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#1F497D'>Simergy Support<o:p></o:p></span></b></p><p class=MsoNormal><a href="mailto:Support@DigitalAlchemyPro.com">Support@DigitalAlchemyPro.com</a><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><a href="http://www.digitalalchemypro.com/">www.DigitalAlchemyPro.com</a><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Simergy-users [mailto:simergy-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Trevor Jaffe<br><b>Sent:</b> Tuesday, September 1, 2015 11:45 AM<br><b>To:</b> simergy-users@lists.onebuilding.org<br><b>Subject:</b> [Simergy-users] Gas Unit Heater Zone HVAC Group Issue<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Simergy list serve users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am having issues with a zone gas fired unit heater and DOAS/exhaust system. The problem is that the gas fired zone unit heater seems to be requiring some sort of loop. The error shown when validating the air loop is as follows:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“Component (UHW-1) does not have a cross loop reference assigned. Assign cross loop reference to this component.”<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My process for creating this system was as follows:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I created the zone HVAC group as a gas unit heater with a temperature controller, temperature sensor, and uncontrolled single duct air inlet. I built this template from scratch.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I assigned my thermal zone to this zone HVAC group.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I created the air loop. I built this template from the out of the box CAV_dxC_gasH and removed the DX cooling coil.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I assigned my thermal zone to this air loop.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When I complete step 4, the gas heater in my zone changes to hot water. When I check back to my zone HVAC group, the unit heater shows as gas like before. Clicking back on the air loop again reveals the unit heater magically restored to gas. But I’m thinking some remnant of the hot water unit heater requirements remain and are causing the error shown above.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have outlined a couple issues here and I’d like to understand what is going on, but my foremost concern is to get the air loop validated with no errors.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance for you help!<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='color:#1F497D'>Trevor Jaffe</span></b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> </span><b><span style='color:#1F497D'>| PE, LEED AP BD+C</span></b><span style='font-size:10.0pt;font-family:"Arial",sans-serif'> <br></span><span style='color:#1F497D'>Mechanical Engineer</span><span style='font-size:10.0pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='border-collapse:collapse'><tr><td width=81 style='width:60.85pt;border:none;border-right:solid #1F497D 1.0pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Westlake<o:p></o:p></span></p></td><td width=136 style='width:102.05pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:gray'>1634 Eye Street NW<o:p></o:p></span></p></td></tr><tr><td width=81 style='width:60.85pt;border:none;border-right:solid #1F497D 1.0pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Reed<o:p></o:p></span></p></td><td width=136 style='width:102.05pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:gray'>Suite 900<o:p></o:p></span></p></td></tr><tr><td width=81 style='width:60.85pt;border:none;border-right:solid #1F497D 1.0pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:12.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Leskosky<o:p></o:p></span></p></td><td width=136 style='width:102.05pt;padding:0in 5.4pt 0in 5.4pt'><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:gray'>Washington DC 20006<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:#7D7D7D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D'>T 202 296 4344</span><i><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:red'> </span></i><i><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D'>x</span></i><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D'>3108</span><i><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:red'><o:p></o:p></span></i></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D'>F 202 296 6116</span><i><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:red'><o:p></o:p></span></i></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:#7D7D7D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D'>Washington DC | New York | Phoenix | Los Angeles | Cleveland<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:#7D7D7D'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:#7D7D7D'><a href="http://www.wrldesign.com"><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D'>www.wrldesign.com</span></a> </span><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D'>|</span><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#7D7D7D'> </span><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D'><a href="http://www.facebook.com/wrldesign"><span style='color:#1F497D'>Facebook</span></a> | <a href="http://www.twitter.com/wrldesign"><span style='color:#1F497D'>Twitter</span></a> | <a href="http://www.linkedin.com/company/47906"><span style='color:#1F497D'>LinkedIn</span></a><o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#C00000'>Architect</span></i></b><b><span style='font-size:8.0pt;font-family:"Arial",sans-serif;color:#C00000'> Magazine 2014; Ranked #1 Overall among U.S. design firms; #5 in Sustainability</span></b><o:p></o:p></p></div></body></html>