The P70, P72, and P170 controls for dual
pressure applications are designed primarily
for use as combination high and low pressure
controls on commercial refrigeration and air
conditioning applications.
These controls are available in several
pressure ranges and are compatible with most
common refrigerants. Ammonia compatible
models are also available.
These controls respond directly to system
pressure changes on both high and low sides,
and can provide single-device control of the
compressor.
Controls are available in several different
electrical ratings and switch configurations,
including independent high and low pressure
switches (on P70S and P170S models). The
P72 models provide direct control of
208-240 volt, single-phase motors up to
3 horsepower, and 208-220 volt,
3-phase motors up to 5 horsepower.