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The XYLEM 349500 is a lower Qwik Hookup assembly designed for use in hydronic boiler systems, where maintaining accurate water levels is critical to safe operation. This assembly provides the lower connection point for boiler water level sensing and control circuits, allowing a technician to establish secure sensor and control wiring connections efficiently. At 1.07 pounds, the unit is compact and manageable during installation. It is intended for commercial heating applications and is installed by licensed HVAC or plumbing technicians working on hot water or steam boiler systems.
The 349500 is suited for commercial and light-industrial hydronic heating systems where boiler water level monitoring is required. The Qwik Hookup design reduces field wiring time by providing a pre-configured connection interface at the lower assembly position. This part is also referenced under the SA159-24 product designation. It is used in systems where low-water cutoff and water level control devices must be reliably connected to boiler controls to prevent dry-fire damage and maintain system efficiency.
Designed as an OEM-style replacement lower hookup assembly for commercial hydronic boiler systems using McDonnell Miller Qwik Hookup water level control configurations.
Installation should be performed by a licensed HVAC technician or plumbing professional familiar with hydronic boiler systems and applicable local codes. Shut down boiler power and relieve system pressure before removing or replacing any water level control assembly. Verify all sensor and control connections are secure and properly rated before returning the system to service. Follow the boiler manufacturer's wiring diagram and any applicable IFGC or local mechanical code requirements during reinstallation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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