Carrier HH57ZC003 Enthalpy Switch R-134A Using this Thermostatic Expansion Valve

Using this Thermostatic Expansion Valve with R410A will result in incorrect superheat settings and potential system failure due to different pressure-temperature relationships

at least 15 psi should be available to the actuator

Industrial Durability: NEMA 1 rated housing with high-grade silicone ensures longevity in boiler and burner applications

Using the genuine Lochinvar 100109941 is critical to maintain the proper ignition sequence and avoid damage to the control board or improper burner alignment

two-position valve body allows for tool-free actuator installation and removal

Carrier HH57ZC003 Enthalpy Switch R-134A Using this Thermostatic Expansion ValveThe Carrier HH57ZC003 Enthalpy Switch is a critical component for optimizing economizer control systems and enhancing energy management in commercial HVACR applications. This genuine OEM replacement part measures both ambient temperature and relative humidity to calculate air enthalpy, providing precise relay output for damper modulation. By evaluating real time atmospheric conditions rather than simple dry bulb temperature, the HH57ZC003 determines