{"product_id":"tekmar-301p-single-zone-switching-relay-with-heat-source-dry-contact","title":"Tekmar 301P Single Zone Switching Relay with Heat Source Dry Contact","description":"\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eTechnical Documents\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003ch2\u003eIntroduction\u003c\/h2\u003e\n\u003cp\u003eThe Switching Relay 301P operates a circulator to provide heating to a hydronic\u003cbr\u003eheating system when the connected thermostat calls for heat. The 301P includes\u003cbr\u003eoptional exercising to prevent circulator seizure when not in use, and optional post purge operation to maximize energy savings. \u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Capture_e3026ca3-e193-427c-a779-df9df7029b6d_480x480.png?v=1720034296\" alt=\"Tekmar 301P\" style=\"float: none;\" data-mce-style=\"float: none;\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Capture_e3026ca3-e193-427c-a779-df9df7029b6d_480x480.png?v=1720034296\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eWhen R-W ccontacts are jumpered, Pump P1 is supplied with 120\/1\/60 electrical power and Dry Contact X-X is closed (it authorizes the heat source to run). Heat Source can be a Boiler, Air to Water Heat Pump, Liquid to Water Heat Pump, Vacuum Tube Solar Collectors or Hybrid PVT Panels.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eSequence of Operation\u003c\/h2\u003e\n\u003ch3 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eDIP Switches\u003c\/h3\u003e\n\u003ch4 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eExercising DIP Switch\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eON: Each circulator pump is energized for 30 seconds every 72 hours.\u003c\/li\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOFF: Circulator pump exercising disabled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003ePost Purge DIP Switch\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eON: After the last thermostat stops calling for heat, the last circulator pump remains on for 2 minutes to purge heat from the boiler to the zone.\u003c\/li\u003e\n\u003cli\u003eOFF: Post purge disabled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eZone Pump Operation\u003c\/h3\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\n\u003cp\u003eWhen a thermostat calls for heat by closing the R and W terminals:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e115 V (ac) is applied to the corresponding circulator pump.\u003c\/li\u003e\n\u003cli\u003eThe corresponding zone indicator LED is turned on.\u003c\/li\u003e\n\u003c\/ul\u003e\nWhen the thermostat stops calling for heat:\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\n\u003cul\u003e\n\u003cli\u003eThe pump is shut off immediately if the Post Purge DIP switch is off.\u003c\/li\u003e\n\u003cli\u003eThe pump operates for 2 minutes if the Post Purge DIP switch is on.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eBoiler Operation\u003c\/h3\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eWhen a thermostat calls for heat by closing the R and W terminals: The boiler end switch XX is closed to fire the boiler.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eIndicator LED Operation\u003c\/h3\u003e\n\u003ch4 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003ePower\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOn when 115 V (ac) is applied.\u003c\/li\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOff when power disconnected or transformer fuse is blown.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eZone 1\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOn when the thermostat calls for heat.\u003c\/li\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOn during pump post purge after the thermostat stops calling for heat and the Post Purge DIP switch is on.\u003c\/li\u003e\n\u003cli style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003eOff when thermostat 1 not calling for heat and post purge expired.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca rel=\"noopener\" title=\"Submittal\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal.pdf?v=1720032791\" data-mce-href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal.pdf?v=1720032791\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal_2_9692b64e-67f8-41db-8db1-a3008ce990f1.png?v=1714067150\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal_2_9692b64e-67f8-41db-8db1-a3008ce990f1.png?v=1714067150\"\u003e\u003c\/a\u003e \u003ca rel=\"noopener\" title=\"O\u0026amp;M Manual\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/O_M_Manual_8bb54652-7557-4cf2-9e37-388e63f216d4.pdf?v=1720032791\" data-mce-href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/O_M_Manual_8bb54652-7557-4cf2-9e37-388e63f216d4.pdf?v=1720032791\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal_4_4398fe88-9d10-4b09-b8e8-e62d61fcf09e.png?v=1714067522\" alt=\"\" data-mce-src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/Submittal_4_4398fe88-9d10-4b09-b8e8-e62d61fcf09e.png?v=1714067522\"\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cdiv style=\"text-align: left;\" data-mce-style=\"text-align: left;\"\u003e\n\u003ca rel=\"noopener\" title=\"O\u0026amp;M Manual\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/O_M_Manual_8bb54652-7557-4cf2-9e37-388e63f216d4.pdf?v=1720032791\" data-mce-href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/O_M_Manual_8bb54652-7557-4cf2-9e37-388e63f216d4.pdf?v=1720032791\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c!----\u003e","brand":"Hydro Solar Innovative Energy","offers":[{"title":"Default Title","offer_id":46965649146102,"sku":"190105301","price":119.23,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0010\/8458\/8093\/files\/tekmar-301p-single-zone-switching-relay-with-heat-source-dry-contact-40912386654454.png?v=1726233805","url":"https:\/\/hydrosolar.ca\/en-us\/products\/tekmar-301p-single-zone-switching-relay-with-heat-source-dry-contact","provider":"Hydro Solar Innovative Energy","version":"1.0","type":"link"}