{"id":386,"date":"2013-04-15T13:02:57","date_gmt":"2013-04-15T18:02:57","guid":{"rendered":"http:\/\/www.kele.com\/keleblog\/?p=386"},"modified":"2022-03-15T16:04:18","modified_gmt":"2022-03-15T21:04:18","slug":"honeywell-t775-controller","status":"publish","type":"post","link":"https:\/\/www.kele.com\/content\/blog\/2013\/04\/15\/honeywell-t775-controller","title":{"rendered":"Honeywell T775 Controller"},"content":{"rendered":"<p>I started at Kele about 19 years ago.\u00a0 Over the years I\u2019ve been fortunate to learn a good bit about controls from many very talented folks \u2013 mentors, fellow employees, industry experts, and customers.\u00a0 It is easy to have favorites in my line of work.\u00a0 Being in tech support over an extended period of time, I have a base of products that I lean on.\u00a0 Usually it\u2019s because a product is dependable, easy to use, and most importantly \u2013 it makes my customers happy.\u00a0 One of those products is the <a href=\"https:\/\/www.kele.com\/thermostats-and-controllers\/t775-series.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">Honeywell <b>T775<\/b><\/a> series of standalone controllers.<\/p>\n<p>There are many times where a full blown building automation controller is overkill and simple control devices, like thermostats, don\u2019t give the flexibility to offer the desired level of control.\u00a0 We get this call almost daily in the tech support pool.\u00a0 While there are several standalone controllers out there to choose from they can be cumbersome for some \u201csmall\u201d jobs.\u00a0 Having to add on multiple modules to a basic controller adds complexity and cost.\u00a0\u00a0 That is where the Honeywell <b>T775<\/b> shines.\u00a0 This simple, cost effective controller can tackle many different control applications with one simple device.\u00a0 Easy to use, saves time, saves money, it\u2019s easy to see why the <b>T775<\/b> is one of the favorites of the tech support group.<\/p>\n<p>Here are some of the features the <strong>T775<\/strong> lineup has to offer:<\/p>\n<ul>\n<li><strong>Easy to use graphical interface<\/strong> \u2013 it really is as easy as some smart phone applications<\/li>\n<li><strong>14 different models to choose from<\/strong> \u2013 Boiler control, reset, temperature, and universal models<\/li>\n<li><strong>Optional NEMA 4X enclosures<\/strong> \u2013 for outdoor applications<\/li>\n<li><strong>Setback models with internal time clock<\/strong> \u2013 maximize energy savings with unoccupied control<\/li>\n<li><strong>Optional independent modulating output models<\/strong> \u2013 one controller for more than one task<\/li>\n<li><strong>Optional modulating high or low limit controls<\/strong> \u2013 protect expensive equipment<\/li>\n<li><strong>Reset models with simplified setup<\/strong> \u2013 changing control points based on environmental factors made easy<\/li>\n<\/ul>\n<p>One of the most popular uses for the <strong>T775<\/strong> is for controlling variable frequency drives in differential pressure applications, for both water and air. The simplicity of setup makes it ideal for these applications.<\/p>\n<p><strong>EXAMPLE<\/strong>: a VFD being used to control pressure in a building.<\/p>\n<p>Parts List:<br \/>\n1) <a href=\"https:\/\/www.kele.com\/thermostats-and-controllers\/t775-series.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\"><strong>T775U<\/strong><\/a> Honeywell controller<br \/>\n1) Differential pressure transmitter (Kele <a href=\"https:\/\/www.kele.com\/pressure\/dpa-series.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">DPA<\/a>\u00a0series, <a href=\"https:\/\/www.kele.com\/pressure\/dpl-series.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">DPL<\/a>\u00a0series, Setra <a href=\"https:\/\/www.kele.com\/pressure\/m264-series.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">M264<\/a>\u00a0series)<br \/>\n1) Room pressure sensor (Kele <a href=\"https:\/\/www.kele.com\/pressure\/a300-series,-rps,-sd-01,-21121,-60681.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">RPS<\/a>, <a href=\"https:\/\/www.kele.com\/pressure\/a300-series,-rps,-sd-01,-21121,-60681.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">A-308-K<\/a>)<br \/>\n1) Outdoor air pressure sensor (<a href=\"https:\/\/www.kele.com\/pressure\/a300-series,-rps,-sd-01,-21121,-60681.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">A-306-K<\/a>)<br \/>\nLength of tubing (<a href=\"https:\/\/www.kele.com\/pneumatics-and-fittings\/t-100-series,-t-141.aspx?utm_source=web&amp;utm_medium=blog&amp;utm_campaign=T775-apr2013\">T-101<\/a>, actual length determined by install)<\/p>\n<p>The room pressure sensor (indoor sensor) and the outdoor air pressure sensor are piped accordingly to the high and low ports of the differential pressure transducer. The orientation of these sensors is determined by whether positive or negative building pressure is desired. If positive building pressure is required, pipe the indoor air sensor to the high port of the differential pressure transmitter and the outdoor pressure sensor to the low port. If negative building pressure is required pipe the outdoor pressure sensor to the high port of the differential pressure transmitter and the indoor pressure sensor to the low port. The differential pressure transmitter senses differential pressure and outputs an analog signal that is used as the input (process variable) to the <strong>T775<\/strong> controller. The <strong>T775<\/strong> modulates its output to control the speed of the fan based on the set point established in the controller setup.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"T775 Controller Setup Diagrams\" src=\"https:\/\/assets.kele.com\/content\/wp-content\/uploads\/2013\/04\/2013-04-honeywell-t775-blog.png\" width=\"322\" height=\"304\" \/><\/p>\n<p>The ease of setup combined with the adjustability of the <b>T775<\/b> makes this application easy.\u00a0 The <b>T775<\/b> uses an easy-to-read display and the setup is menu driven.\u00a0 The graphical interface actually walks the user through the setup, which saves valuable time and money on the installation.\u00a0 Pinpoint control with adjustable integral and derivative times is easy to achieve with the <b>T775<\/b>.\u00a0 And that\u2019s not just for this application, there are many others.\u00a0 So the next time you have a \u201csmall\u201d control job give Kele a call to discuss using the <b>T775<\/b> and save yourself some time and money.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I started at Kele about 19 years ago.\u00a0 Over the years I\u2019ve been fortunate to learn a good bit about controls from many very talented folks \u2013 mentors, fellow employees, industry experts, and customers.\u00a0 It is easy to have favorites in my line of work.\u00a0 Being in tech support over an extended period of time, [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[7,8,11],"tags":[41,64,105,120,122,127,136],"class_list":["post-386","post","type-post","status-publish","format-standard","hentry","category-kele-makes-it-easy","category-kele-product-information","category-tech-favorites-2","tag-controls","tag-honeywell","tag-pressure","tag-t775","tag-tech-favorites","tag-thermostats-controllers","tag-vfd"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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