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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'>You might want to look at your night cycle fan control:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'><o:p> </o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>NIGHT-CYCLE-CTRL<o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Takes
a code-word that specifies whether the fans will cycle on at night or on
weekends (implied by a 0 in FAN-SCHEDULE) to maintain the temperature setpoint.
The fans are off when the hourly values in the schedule that is referenced by
FAN-SCHEDULE are equal to 0. If the hourly schedule values are positive, the
fans are on and if the hourly schedule values are negative, the fans are not
permitted to be on under any circumstances. NIGHT-CYCLE-CTRL also cycles fans
on when the temperature goes above the throttling range of the
ZONE:COOL-TEMP-SCH. To lock out this feature you must input a -1 in the
FAN-SCHEDULE for the summer (cooling) period. NIGHT-CYCLE-CTRL only affects the
fan operation. Once the fans have cycled on, the availability of heating or
cooling is controlled by HEATING-SCHEDULE and COOLING-SCHEDULE. Allowed values
of NIGHT-CYCLE-CTRL are:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>STAY-OFF
The fans stay off regardless of conditions.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>CYCLE-ON-ANY
The fans are cycled
on for the hour if the temperature of any zone in the system falls below the
throttling range for heating, <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>CYCLE-ON-FIRST
The fans are cycled on for the hour
if the temperature in the system's control zone falls below the throttling
range for heating.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>ZONE-FANS-ONLY
For a PIU system, the main or central
system PIU fan will remain off but the individual zone terminal fans will cycle
on separately to satisfy the heating setback temperature for each zone.<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'>The default is to stay off. It sound like in your situation you
want it to cycle on any. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-family:"Garamond","serif";color:black'>Vikram Sami,</span></b><span
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404-253-1466 | Direct Fax 404-253-1366</span><span style='color:#0025C4'> <o:p></o:p></span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:24.0pt;font-family:Webdings;color:#007F00'>P </span><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:#007F00'>Think
GREEN before you print.</span><span style='color:#0025C4'><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
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</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Lam,
Linda<br>
<b>Sent:</b> Monday, June 15, 2009 3:09 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] PSZ-HP High heating unmet load hours<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Equest
Users:</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I'm
modeling a single story building with 2 packaged rooftop HP units in Las Vegas.
I have allowed the program to autosize airflow and cooling and heating
capacities.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I'm
guessing that the high amount of underheated hours is due to the fact
that the PSZ system type uses only one of its assigned zones as the
control for constant volume airflow. I have designated the control
zone as the zone with the highest internal loads. This works OK in
cooling mode, though, I still have about 400 undercooled hours.
But in heating mode, the zone with the highest internal loads does not
need as much heat as the other zones. Since it's a constant volume system
and the control zone is saying "no heat needed", the rest of the
zones are not getting any heat. Is that right??</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Following
through with the assumption above, I tried to increase the minimum
cfm/sqft on zone level to 0.5, but my underheated hours went up.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
only manage to decrease unmet heating hours after I increase
the cfm on the system level to about 5 times what Trane sizes. </span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Can
someone help me out here?</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thank
you!!</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Linda</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
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