\u003c/strong>\u003cem >IMAGE COURTESY OF SCHNEIDER ELECTRIC \u003c/em>\u003c/p>"},"type":"text","cl":"text"},{"key":"eAaa1WQGUAb","type":"section","children":["ern-cQsgRWU","eTLDCLXalDc","e2urW0FnWb5"],"cl":"section"},{"key":"eZIqJzLXbvW","content":{"text":"\u003ch3 >3. High Humidity Switches:\u003c/h3>\u003cp >Humidifiers located in ducted air systems often have an associated high-humidity switch located downstream of them. These switches are often hardwired to disable the humidifier in the event the humidity in the duct exceeds an adjustable threshold (see Figure 1). This is to prevent saturating the supply duct. See Figure 2 for a controls diagram of a make-up air unit utilizing such a switch. \u003c/p>\u003cp >The high-humidity switch can also be monitored by the BAS by use of a binary input to the BAS controller. With the additional information comes opportunity. Now, the building operator can use this switch to identify if something is going wrong with the humidifier. It is common for such an alarm notification to be specified, and programmed, to be generated anytime that switch triggers. This would be another example of an inappropriately configured alarm condition. Why? Because there are times when it is expected this switch should trigger under normal operating conditions. For example, if it is very hot and humid outside, the cooling valve in Figure 2 may be modulating to maintain a supply air temperature of approximately 55°F and the humidifier would be off. If the dewpoint of the entering air is above 55°F, then the leaving air will be quite saturated, often to a relative humidity value above that of the switch’s setting. In such instances, the high humidity switch will trigger, but do we really want an alarm in such a case? No, we don’t, we only want a high humidity alarm when the system suspects faulty humidifier operation. \u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"ezD86qvejPF","type":"section","children":["eZIqJzLXbvW"],"cl":"section"},{"key":"ePJPWDqu91k","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"desktop":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"mobile":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"er71UEVXqIa","content":{"src":{"key":"LsLqapEmRb","url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=1920/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/LsLqapEmRb.png","ratio":3.9904942965779466}},"type":"image","actions":["ePJPWDqu91k"],"cl":"image"},{"key":"ep8SO38SfVM","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"e8Vbh9-0-ak","type":"rectangle","actions":["ep8SO38SfVM"],"cl":"rectangle"},{"key":"ekpgYRn8zLH","content":{"text":"\u003cp >\u003cstrong >Figure 2: Makeup Air Unit controls diagram. “HHL” denotes the high humidity limit switch.\u003cbr />\u003c/strong>\u003cem >IMAGE COURTESY OF QUESTIONS & SOLUTIONS ENGINEERING INC.\u003c/em>\u003c/p>"},"type":"text","cl":"text"},{"key":"eyzvCHgct1-","type":"section","children":["er71UEVXqIa","e8Vbh9-0-ak","ekpgYRn8zLH"],"cl":"section"},{"key":"eHy8cXYcKFJ","content":{"text":"\u003cp >If a high-humidity alarm is specified, then an appropriate alarming condition would be if the high-humidity switch triggers \u003cem >while\u003c/em> humidifier was enabled. And to be clear, there should not be an alarm delay on this one. \u003c/p>\u003cp >Another way to do this would be to issue an alarm if the cooling valve was closed \u003cem >and \u003c/em>the high-humidity switch triggered. This may allow for the system to identify a leaking humidifier valve, but it may also result in nuisance trips during certain ambient conditions (e.g., 53°F and 100% relative humidity). \u003c/p>\u003ch2 >\u003cstrong >Conclusion\u003c/strong>\u003c/h2>\u003cp >Commissioning providers can bring value to the owner by critically thinking through the specified and programmed alarm conditions. Identifying shortcomings in the logic that will produce nuisance alarms is just the first step. Ensuring those shortcomings are addressed is the next step, as there is no sense in someone else wasting time discovering this shortcoming for themselves sometime in the future. \u003c/p>\u003ch2 >References:\u003c/h2>\u003cp >\u003csup >1\u003c/sup>Ryan, M. 2023\u003cem >. “\u003c/em>Proper Alarm Suppression Reduces Nuisance Alarms.” \u003cem >Engineered Systems Magazine\u003c/em> (June).\u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"eacIXEgx-wP","type":"section","children":["eHy8cXYcKFJ"],"cl":"section"},{"key":"eNexQfHeaPL","content":{"text":"\u003ch3 >Miles Ryan, P.E.\u003c/h3>\u003cp >Miles Ryan is a commissioning engineer at Questions & Solutions Engineering. As a major in the Air Force Reserves, he serves as a mechanical systems instructor at the Air Force Institute of Technology. Contact him at \u003ca target=\"_blank\" href=\"mailto:miles.ryan@qseng.com\">miles.ryan@qseng.com\u003c/a>. \u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"evp25_6rauq","content":{"src":{"key":"DxIsmw_hXi","url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/dGfp5o6mCvamSl03ciyX2avEXmC2/image/DxIsmw_hXi.png","ratio":1}},"type":"image","cl":"image"},{"key":"eTcIS9CR-77","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1608215947395,"LoadAnimation":{"duration":1.6,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1608215947395,"LoadAnimation":{"duration":1.6,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1608215947395,"LoadAnimation":{"duration":1.6,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"emtVVWuTLX8","type":"section","actions":["eTcIS9CR-77"],"children":["eNexQfHeaPL","evp25_6rauq"],"cl":"section"},{"key":"eSy3uUwa0DL","content":{"link":{"mode":0,"page":"pKEO3CF_5i-"}},"type":"external-link","cl":"external-link"},{"key":"eGzgPtPU-Km","content":{"text":"\u003cdiv>\u003cp >Table Of Contents\u003c/p>\u003c/div>"},"type":"text","actions":["eSy3uUwa0DL"],"cl":"text"},{"key":"eHRuMv8qVCb","content":{"text":"\u003cp >July 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