{"product_id":"lochinvar-a-o-smith-100167786-time-delay-module","title":"Lochinvar \u0026 A.O. Smith 100167786 Time Delay Module","description":"\u003cp\u003eFor experienced service technicians working on Lochinvar or A.O. Smith high-efficiency hydronic systems, the \u003cstrong\u003eLochinvar 100167786 Time Delay Module\u003c\/strong\u003e is the required OEM replacement to maintain factory-spec sequencing. This component is \u003cstrong\u003eidentical to part number RLY3003\u003c\/strong\u003e and provides critical timing control for the startup and post-purge cycles. In high-demand residential and commercial applications, this module regulates the timing of the \u003cstrong\u003ecirculator pump relay\u003c\/strong\u003e and the \u003cstrong\u003ecombustion air blower\u003c\/strong\u003e, preventing thermal stress on the heat exchanger. By managing the \u003cstrong\u003epost-purge operation\u003c\/strong\u003e, it ensures that residual heat is effectively moved out of the combustion chamber after the burner shuts down, which is essential for protecting the \u003cstrong\u003eSmart System control board\u003c\/strong\u003e and preventing nuisance limit-trips or \u003cstrong\u003eshort cycling\u003c\/strong\u003e. This is a direct-fit \u003cstrong\u003egenuine OEM part\u003c\/strong\u003e, ensuring that voltage tolerances and delay intervals match the original equipment design for seamless integration with existing wiring harnesses.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits for Professionals\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect OEM Integration:\u003c\/strong\u003e Replaces \u003cstrong\u003eLochinvar RLY3003\u003c\/strong\u003e without any field modifications, maintaining the integrity of the original control circuit.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEquipment Protection:\u003c\/strong\u003e Prevents \u003cstrong\u003eshort cycling\u003c\/strong\u003e and manages post-purge timing to decrease the thermal load on internal components, extending the life of the heat exchanger.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision Timing:\u003c\/strong\u003e Engineered to provide accurate electrical sequencing for \u003cstrong\u003ehigh-efficiency boilers\u003c\/strong\u003e and commercial water heaters.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVersatile Compatibility:\u003c\/strong\u003e Designed for use across various Lochinvar and A.O. Smith platforms, including \u003cstrong\u003eKnight boilers\u003c\/strong\u003e and \u003cstrong\u003eArmor water heaters\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eField Reliability:\u003c\/strong\u003e Built to meet strict factory standards, reducing the risk of call-backs caused by unstable timing in the ignition or pump-run sequence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the 100167786 a direct swap for the RLY3003?\u003c\/strong\u003e\u003cbr\u003e\nYes, the \u003cstrong\u003eLochinvar 100167786\u003c\/strong\u003e is the updated manufacturer part number and is functionally identical to the \u003cstrong\u003eRLY3003\u003c\/strong\u003e. It installs into the same mounting footprint with the same electrical connections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a failing time delay module?\u003c\/strong\u003e\u003cbr\u003e\nTechnicians often see issues where the \u003cstrong\u003ecirculator pump\u003c\/strong\u003e fails to engage for the post-purge cycle, or the burner shuts down prematurely without the proper delay, often leading to overheating codes or \u003cstrong\u003eflame failure\u003c\/strong\u003e lockouts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use a generic off-the-shelf delay relay instead?\u003c\/strong\u003e\u003cbr\u003e\nUsing generic relays is not recommended. The \u003cstrong\u003e100167786 OEM module\u003c\/strong\u003e is calibrated to specific timing intervals required by \u003cstrong\u003eLochinvar and A.O. Smith\u003c\/strong\u003e logic controllers to ensure safe and efficient ignition and shutdown sequences.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Lochinvar \u0026 A.O. Smith","offers":[{"title":"Default Title","offer_id":35656109644,"sku":"100167786","price":422.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_7c7e3800-34e8-4098-bef6-7161fc833b06.png?v=1772214811","url":"https:\/\/www.gsistore.com\/en-ca\/products\/lochinvar-a-o-smith-100167786-time-delay-module","provider":"GSIstore","version":"1.0","type":"link"}