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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
Always check the wiring schematic on your unit’s access panel
The B217 ball valve design is maintenance-free and does not require repacking
including the 24V compressor contactor signal and blower speed switching
Whether you are performing routine service on boilers
MARS 39225 Limit Switch R-448A Always check the wiring schematicThe MARS 39225 Adjustable Limit Switch is a high performance open on rise thermal safety control designed for precise temperature regulation in HVAC systems, furnaces, and industrial heating applications. Built for the rigors of field service, this adjustable limit switch offers a flexible setpoint range of 175F to 215F, allowing technicians to dial in the exact thermal parameters required for specific equipment. It features a robust SPST switch
