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<p class=MsoNormal>My LEED baseline model is HVAC system type 4 – PSZ-HP
and Section G3.1.3.1 states:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>“Electric air-source heat pumps shall be modeled with
electric auxiliary heat. The systems shall be controlled with multistage
space thermostats and an outdoor air thermostat wired to energize auxiliary
heat only on the last thermostat stage and when outdoor air temperature is less
than 40degF.”<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So, the auxiliary heat remains off until the heat pump can
no longer do its job and is activated only if the OA temp is less than
40degF. Is the intention to allow the heat pump to continue running simultaneously
with the auxiliary heat? Or, at the moment the heat pump can no longer
handle the space heating requirement does it shut off and allow the auxiliary
heat to do the entire job by itself? If it is intended that both
functions operate simultaneously is there an OA temperature limit where the
heat pump should be turned off?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone have some insight as to what eQUEST is doing for
the control sequence of this system type? Is it meeting the criteria of
this Appendix section inherently or do I need to fiddle with the values in the
screenshot below to make it compliant?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The eQUEST heat pump supplemental heat window looks like
this:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=665 height=304 id="_x0000_i1026"
src="cid:image003.jpg@01CB2F3C.CF3BFF30"><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>There appears to be only two inputs:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Minimum HP Heat Temp (Turns heat pump off when
OA temp is below this temperature.)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-family:Symbol'><span style='mso-list:Ignore'>·<span
style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]>Maximum HP Supp Temp (OA temp at which
supplemental heat becomes available.)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The latter, seems to match with the intended 40 deg OA
setpoint specified in the Appendix G section above.<o:p></o:p></p>
<p class=MsoNormal>What’s more unclear to me is how the Minimum HP Heat
Temp input should be utilized. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Garamond","serif";
color:#960028'>Dan Russell<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Garamond","serif";
color:#C00000'><img width=197 height=140 id="Picture_x0020_1"
src="cid:image001.png@01CB2F39.542DCC40" alt="EI Signature"></span><span
style='font-size:14.0pt;font-family:"Garamond","serif";color:#CA0002'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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