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MFT Programmability: Field-adjustable parameters allow for custom input signals
Key Benefits Enhanced System Reliability: The 120-second thermal expansion time delay relay prevents unnecessary downtime by filtering out momentary pressure fluctuations
making it ideal for older 4-wire systems where a common wire is unavailable
supporting both 120V and 240V configurations
This high capacity relief valve is a standard choice for commercial boiler maintenance
Carrier HH19ZA156 Limit Switch 326010-701 MFT Programmability: Field-adjustable parameters allowThe Carrier HH19ZA156 Limit Switch is a critical OEM safety component designed for precise thermal regulation within Carrier, Bryant, and Payne furnace assemblies. This normally closed disc style switch acts as a primary high limit safeguard, engineered to interrupt the electrical circuit and terminate the heating cycle when internal plenum temperatures reach the 155F open setpoint. Once the heat exchanger cools to the 105F close setpoint, the
