{"product_id":"nibe-high-pressure-switch-418874","title":"Nibe High Pressure Switch - 418874","description":"\u003cp data-path-to-node=\"0\" id=\"p-rc_44e59a352c7c46a0-159\"\u003e\u003cspan class=\"citation-307\"\u003eThe \u003c\/span\u003e\u003cb data-path-to-node=\"0\" data-index-in-node=\"4\"\u003e\u003cspan class=\"citation-307\"\u003eNIBE High-Pressure Switch 24.5 Bar (Part Number: 418874)\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-307\"\u003e, also referred to a \u003c\/span\u003e\u003cb data-path-to-node=\"0\" data-index-in-node=\"105\"\u003e\u003cspan class=\"citation-307\"\u003ehigh-pressure pressostat\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-307 citation-end-307\"\u003e, is a critical safety component popular range of exhaust air and ground source heat pumps.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003ch3 data-path-to-node=\"2\"\u003eTechnical Function\u003c\/h3\u003e\n\u003cp data-path-to-node=\"3\" id=\"p-rc_44e59a352c7c46a0-160\"\u003e\u003cspan class=\"citation-306 citation-end-306\"\u003eThis switch acts as a mechanical guardian for your heat pump's refrigeration circuit.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\" id=\"p-rc_44e59a352c7c46a0-161\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eThe Job:\u003c\/b\u003e \u003cspan class=\"citation-305 citation-end-305\"\u003eIt constantly monitors the pressure of the refrigerant.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eThe Limit:\u003c\/b\u003e If the internal pressure spikes to \u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"46\"\u003e24.5 bar\u003c\/b\u003e (often due to restricted water flow, a failing circulation pump, or a blocked air filter), the switch instantly trips.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\" id=\"p-rc_44e59a352c7c46a0-162\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003eThe Result:\u003c\/b\u003e \u003cspan class=\"citation-304 citation-end-304\"\u003eIt cuts power to the compressor to prevent catastrophic physical damage to the system.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-303\"\u003eWhen this trips, your heat pump will register a \u003c\/span\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"147\"\u003e\u003cspan class=\"citation-303\"\u003eHigh Pressure (HP) fault code\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-303 citation-end-303\"\u003e and lock out.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"6\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp data-path-to-node=\"7\"\u003eThis specific 24.5 bar switch (418874) is used extensively across NIBE's classic \u003cb data-path-to-node=\"7\" data-index-in-node=\"81\"\u003eFighter\u003c\/b\u003e exhaust air series, as well as some older ground source units.\u003c\/p\u003e\n\u003ctable data-path-to-node=\"8\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeat Pump Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Models\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"8,1,0,0\"\u003e\u003cb data-path-to-node=\"8,1,0,0\" data-index-in-node=\"0\"\u003eExhaust Air Heat Pumps\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"8,1,1,0\"\u003eFighter 200P, 205P, 310P, 315P, 360P, 410P, 600P, 640P\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"8,2,0,0\"\u003e\u003cb data-path-to-node=\"8,2,0,0\" data-index-in-node=\"0\"\u003eGround Source Heat Pumps\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan data-path-to-node=\"8,2,1,0\"\u003eFighter 1110, 1115, 1125, 1210, 1215, 1310\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3 data-path-to-node=\"14\"\u003e\u003c\/h3\u003e\n\u003ch3 data-path-to-node=\"14\"\u003eA Note on Diagnostics\u003c\/h3\u003e\n\u003cp data-path-to-node=\"15\"\u003eIf your heat pump is continuously locking out on a High-Pressure error, \u003cb data-path-to-node=\"15\" data-index-in-node=\"72\"\u003edon't assume the switch itself is broken.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"16\"\u003eBefore replacing the switch, a heating engineer should check the actual root causes of high pressure:\u003c\/p\u003e\n\u003col start=\"1\" data-path-to-node=\"17\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,0,0\"\u003e\u003cb data-path-to-node=\"17,0,0\" data-index-in-node=\"0\"\u003eAir in the heating system:\u003c\/b\u003e Bleed your radiators and underfloor manifolds.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,1,0\"\u003e\u003cb data-path-to-node=\"17,1,0\" data-index-in-node=\"0\"\u003eDirty filters:\u003c\/b\u003e A choked air filter or a blocked \"Y-strainer\" on the central heating pipework will choke the heat transfer, causing pressure to skyrocket.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"17,2,0\"\u003e\u003cb data-path-to-node=\"17,2,0\" data-index-in-node=\"0\"\u003eCirculation Pump failure:\u003c\/b\u003e If the pump isn't moving water fast enough, the heat pump can't shed its heat, tripping the 24.5 bar limit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cblockquote data-path-to-node=\"18\"\u003e\n\u003cp data-path-to-node=\"18,0\"\u003e\u003cb data-path-to-node=\"18,0\" data-index-in-node=\"0\"\u003eCrucial Safety Rule:\u003c\/b\u003e Because this switch is integrated directly into the pressurized refrigerant circuit, replacing it requires reclaiming the refrigerant. This work \u003cb data-path-to-node=\"18,0\" data-index-in-node=\"166\"\u003emust\u003c\/b\u003e be carried out by an F-Gas certified heating engineer.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"Nibe","offers":[{"title":"Default Title","offer_id":55608335040888,"sku":"vn188","price":79.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/0496\/7984\/files\/SAM_0229.jpg?v=1784279826","url":"https:\/\/varme-tec.com\/products\/nibe-high-pressure-switch-418874","provider":"Varmetec Limited","version":"1.0","type":"link"}