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ashrae 62.1-2004 section 5.4 ventilation controls. mechanical
ventilation systems shall include controls, manual or automatic,
that enable the fan system to operate whenever the spaces served are
occupied. the system shall be designed to maintain the minimum
outdoor airflow as required by section 6 under any load condition.
note: vav systems with fixed outdoor air damper positions must
comply with this requirement at minimum airflow.<br>
<br>
ashrae 62.1-2007 user's manual, page 5-11. user's manual example
also explains why the 'auto' setting for fan on a basic thermostat
does not meet the requirement to provide outdoor air when the spaces
is occupied - the fan will cycle off when setpoint is reached and no
outdoor air will be supplied until the next call for cooling &
the fan comes back on.<br>
<br>
On 6/6/12 10:25 AM, John Aulbach wrote:
<blockquote
cite="mid:1339003538.11240.YahooMailNeo@web126103.mail.ne1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff; font-family:times
new roman, new york, times, serif;font-size:12pt">
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; ">Gang:</div>
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; "><br>
</div>
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; ">I am trying to find where in the
Texas Health and Safety Code where is says you must OPERATE
ventilation in a certain manner, not just design a system to
provide such ventilation. Tells me if i can reduce or
eliminate exhaust air during certain times of the day (eQuest
EEM).</div>
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; "><br>
</div>
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; ">California Title-24, Subchapter 3,
Section 121.c.1 specifically states:</div>
<div style="font-family: 'times new roman', 'new york', times,
serif; font-size: 12pt; "><br>
</div>
<div>
<div><font face="times new roman, new york, times, serif">1.
Times of occupancy. The minimum rate of outdoor air
required by Section 121(b)2 shall be supplied to each</font></div>
<div><font face="times new roman, new york, times, serif">space
at all times when the space is usually occupied.</font></div>
<div><font face="times new roman, new york, times, serif">EXCEPTION
1 to Section 121(c)1: Demand control ventilation. In
intermittently occupied spaces that do not</font></div>
<div><font face="times new roman, new york, times, serif">have
processes or operations that generate dusts, fumes, mists,
vapors or gasses and are not provided with local</font></div>
<div><font face="times new roman, new york, times, serif">exhaust
ventilation (such as indoor operation of internal
combustion engines or areas designated for unvented</font></div>
<div><font face="times new roman, new york, times, serif">food
service preparation), the rate of outdoor air may be
reduced if the ventilation system serving the space is</font></div>
<div><font face="times new roman, new york, times, serif">controlled
by a demand control ventilation device complying with
Section 121(c)4.</font></div>
<div><font face="times new roman, new york, times, serif">EXCEPTION
2 to Section 121(c)1: Temporary reduction. The rate of
outdoor air provided to a space may be</font></div>
<div><font face="times new roman, new york, times, serif">reduced
below the level required by Section 121(b)2 for up to 5
minutes each hour if the average rate for each</font></div>
<div><font face="times new roman, new york, times, serif">hour
is equal to or greater than the required ventilation rate.</font></div>
<div><font face="times new roman, new york, times, serif">NOTE:
VAV must comply with Section 121(c)1 at minimum supply
airflow.</font></div>
<div><font face="times new roman, new york, times, serif"><br>
</font></div>
<div><font face="times new roman, new york, times, serif">I am
trying to find a similar edict for the State of Texas.</font></div>
<div><font face="times new roman, new york, times, serif"><br>
</font></div>
<div><font face="times new roman, new york, times, serif">Any
takers?</font></div>
<div><font face="times new roman, new york, times, serif"><br>
</font></div>
<div>
<div class="MsoNormal"><a moz-do-not-send="true"
name="_MailAutoSig"><span
style="mso-fareast-font-family:
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Roman";mso-fareast-theme-font:minor-fareast;color:#1F497D;
mso-no-proof:yes">John R. Aulbach, PE, CEM<o:p></o:p></span></a></div>
<div class="MsoNormal"><span
style="mso-fareast-font-family:"Times New
Roman";mso-fareast-theme-font:minor-fareast;
color:#1F497D;mso-no-proof:yes">Senior Energy Engineer<o:p></o:p></span></div>
<div class="MsoNormal"><span
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yes">
<hr align="left" noshade="noshade" size="2" width="30%">
</span></div>
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style="mso-fareast-font-family:"Times New
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font-variant:small-caps;color:#006600;mso-no-proof:yes">Energy</span><span
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<div class="MsoNormal"><span
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color:#1F497D;mso-no-proof:yes">2154 Torrance Blvd, Ste.
100, Torrance, CA 90501<br>
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745<o:p></o:p></span></div>
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color:#1F497D;mso-no-proof:yes"> </span><a
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href="mailto:%7C%20jaulbach@ptrenergy.com">|
jaulbach@ptrenergy.com</a><span
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<div><font face="times new roman, new york, times, serif"><br>
</font></div>
<div><font face="times new roman, new york, times, serif"><br>
</font></div>
</div>
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<br>
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