Dwyer Instruments DA-33-2-9 Pressure Switch 321894-709 or the chiller failing to

or the chiller failing to load/unload correctly

and Carrier inducer blower wheels

Always verify sizing against the outdoor unit manufacturer’s charging chart

Common Questions: Can this regulator be mounted vertically

This unit is rated for total pressures up to 100 psi (7 bar) and is the industry standard for portable

Dwyer Instruments DA-33-2-9 Pressure Switch 321894-709 or the chiller failing toThe Dwyer Instruments DA 33 2 9 Pressure Switch is a heavy duty Bourdon tube operated control designed for precision in demanding HVACR and industrial process environments. This Mercoid Series DA model features an adjustable operating range of 10 to 300 psig, providing reliable SPST (Single Pole Single Throw) switching logic for high pressure or low pressure limit control. Engineered for vertical installation via a flange mount, the DA 33 2 9 includes