The Stiebel Eltron 333891 Expanding Valve DPF(T)1.8C-36 EXV is a genuine electronic expansion valve used in Stiebel Eltron heat pump systems to regulate refrigerant flow for optimal performance.

Key Details
•     Part number: 333891
•     Type: Electronic expansion valve (DPF series)
•     Model designation: DPF(T)1.8C-36 EXV
•     Function: Controls refrigerant flow rate in heat pump systems, ensuring efficient heating and cooling cycles.
•     Bidirectional operation: Suitable for heat pump applications where refrigerant flow reverses between heating and cooling.
•     Refrigerants supported: Common HCFC and HFC refrigerants such as R-22, R-134a, R-404A, R-407C, R-410A, R-507.

Technical Specifications (DPF Series Reference)
•     Cooling capacity: 1.3 to 36 tons (R-410A nominal capacity)
•     Operating pressure: Up to 650 psig
•     Temperature range:
•     Medium: −22 °F to +158 °F
•     Ambient: −22 °F to +140 °F
•     Design: Compact, lightweight, optimized flow path for noise reduction and energy efficiency

Compatible Stiebel Eltron Models
The 333891 valve is typically found in:
•     WPL series (air source heat pumps)
•     WS/WW series (ground source heat pumps)
•     Other Stiebel Eltron units using DPF(T)1.8C‑36 EXV expansion valves
Exact compatibility depends on the capacity rating of your heat pump (1.3 ton nominal capacity for R‑410A)

Typical Use
•     Installed in air source and ground source heat pumps.
•     Ensures precise refrigerant metering for efficiency and reliability.
•     Replacement part when the original expansion valve fails or requires servicing.

Notes
•     Always confirm compatibility with your specific Stiebel Eltron heat pump model before ordering.