{"id":1075,"date":"2021-08-02T11:36:25","date_gmt":"2021-08-02T15:36:25","guid":{"rendered":"http:\/\/www.michiganair.com\/blog\/?p=1075"},"modified":"2021-08-02T11:43:17","modified_gmt":"2021-08-02T15:43:17","slug":"new-vari-green-hoa-control","status":"publish","type":"post","link":"https:\/\/www.michiganair.com\/blog\/new-vari-green-hoa-control\/","title":{"rendered":"New Vari-Green HOA Control"},"content":{"rendered":"\n<p>Source: <a href=\"https:\/\/www.greenheck.com\/en\/home\">Greenheck<\/a><\/p>\n\n\n\n<p>A recent release in Greenheck&#8217;s Computer Aided Product Selection (<a href=\"https:\/\/www.greenheck.com\/resources\/software\/caps\">CAPS<\/a>) Program includes <a href=\"https:\/\/www.greenheck.com\/vari-green\/vari-green-controls\">Hand \/ Off \/ Auto (HOA)<\/a> for the Vari-Green product line. The new Vari-Green HOA control from Greenheck gives the user the ability to:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Run the fan in hand mode (speed defined at this device) <\/li><\/ul>\n\n\n\n<ul class=\"wp-block-list\"><li>Enable \/ disable the fan<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"260\" height=\"260\" src=\"http:\/\/www.michiganair.com\/blog\/wp-content\/uploads\/2021\/08\/Vari-Green_HOA-Controller-1.jpg\" alt=\"\" class=\"wp-image-1082\" srcset=\"https:\/\/www.michiganair.com\/blog\/wp-content\/uploads\/2021\/08\/Vari-Green_HOA-Controller-1.jpg 260w, https:\/\/www.michiganair.com\/blog\/wp-content\/uploads\/2021\/08\/Vari-Green_HOA-Controller-1-150x150.jpg 150w\" sizes=\"(max-width: 260px) 100vw, 260px\" \/><\/figure>\n\n\n\n<p>The fan can be enabled by using a dry contact closure or by providing a voltage (12-120V). This new capability means that the HOA can be the go-to between device to hook up any Vari-Green fan to just about any system. A programmable override setting is also included. The override will ignore other commands and send the fan to a defined speed. With only three buttons and an LED display, this compact accessory is functional and user-friendly.<\/p>\n\n\n\n<p><strong>Modes Defined<\/strong><\/p>\n\n\n\n<p><strong>Hand Mode:<\/strong> Set motor speed manually in the HOA keypad. Use this mode for balancing, troubleshooting, or to operate fan before external controls are installed \/ operational.<\/p>\n\n\n\n<p><strong>Auto-Local Mode: <\/strong>Set motor speed using HOA control. The motor can start\/stop remotely via dry input and\/or voltage input.<\/p>\n\n\n\n<p><strong>Auto-Remote Mode:<\/strong> The remote device provides 0-10V signal for speed reference. The motor can start\/stop remotely  via dry input and\/or voltage input. <\/p>\n\n\n\n<p><strong>Override:<\/strong> Voltage input will run the motor at speed set in the HOA keypad. This input will take precedence over every other signal\/mode.<\/p>\n\n\n\n<p><strong>How to Select in CAPs<\/strong><\/p>\n\n\n\n<p><strong>As a Control:<\/strong> You can select the HOA from the Vari-Green control drop down. This device is controlling the fan or it is passing a speed reference by others.<\/p>\n\n\n\n<p><strong>As an Accessory: <\/strong>Pick your Vari-Green control (remote dial, constant pressure, etc.) and apply the HOA as an accessory to the fan. The existing transformer box now lets you pick either a transformer or an HOA (mounted or shipped loose). The HOA now becomes an accessory to any other Vari-Green controls. These controls can be installed in many fans and mounted in the space.<\/p>\n\n\n\n<p><strong>Example Application<\/strong><\/p>\n\n\n\n<p>Let&#8217;s look at a typical scenario like a stairwell pressurization application. Suppose you have a Vari-Green exhaust fan. In the event of a fire, you want a constant pressure controller to modulate the fan speed to maintain 0.10 in. wg in that space. The HOA controller can accept the 0-10V signal from the constant pressure controller, but not pass the signal to the motor unless it receives a voltage or dry contact signal allowing the fan to run. The applications are endless with this device since it can be controlled by other equipment.<\/p>\n\n\n\n<p><strong>What this means for you: Easy integration with a lot less hassle.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Source: Greenheck A recent release in Greenheck&#8217;s Computer Aided Product Selection (CAPS) Program includes Hand \/ Off \/ Auto (HOA) for the Vari-Green product line. The new Vari-Green HOA control from Greenheck gives the user the ability to: Run the fan in hand mode (speed defined at this device) Enable \/ disable the fan The [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1082,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15,1],"tags":[],"class_list":["post-1075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-distribution-ventilating","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>New Vari-Green HOA Control<\/title>\r\n<meta name=\"description\" content=\"A recent release in Greenheck&#039;s Computer Aided Product Selection (CAPS) Program includes Hand \/ Off \/ Auto (HOA) for the Vari-Green product line.\" 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