(1): according to UL approval

Liquid receiver tank pressure regulators, CLASSIC line

These regulators are used with condensing pressure regulators, instead of differential valves. Together, these valves form a control system that maintains constant condenser and liquid receiver tank pressure in systems with heat recovery and air and water condensation. They by-pass the hot gas from the compressor outlet to the liquid receiver tank, increasing the pressure of the liquid in the receiver tank.
Accessories for use with the following ASHRAE 34:2019 refrigerants, Class A1:
HCFC (R22)
HFC (R134a, R404A, R407C, R410A, R507)
HFO (R1234ze)
HFO + HFC (R448A, R449A, R450A, R452A, R513A, R515A, R515B)