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Heavy-Duty Construction: Built to withstand the continuous duty cycles required for commercial fan coil units and air handlers
Complete Kit: Includes the 4350-127 thermostat
and gaskets to restore OEM performance
Simplified Installation: Standard 1-1/2 inch NPT connections allow for straightforward replacement in existing boiler manifolds
Integrating a new Armstrong inducer blower assembly helps promote consistent oxygen flow for combustion
Carrier HN67ZZ001 Circuit Board 320074-702 Heavy-Duty Construction: Built to withstandThe Carrier HN67ZZ001 Circuit Board is a critical OEM relay circuit board designed for high performance integration within Carrier HVAC systems. As a direct replacement for the legacy HN67ZA002A, this board handles essential switching logic and load distribution for blower motors and inductive components. For technicians troubleshooting intermittent failures or total system lockouts, installing this genuine Carrier replacement part ensures the control