(1): according to UL approval

Start pressure regulators, CLASSIC line

These are regulators commonly used in low-temperature refrigeration systems. They are designed to prevent the compressor motor from overloading when the intake pressure exceeds the manufacturer's recommended operating pressure.
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)