Product/Technical Bulletin P
Issue Date 0205
© 2005 Johnson Controls, Inc. 1
Part No. 24-7664-2608, Rev. —
P70, P72, and P170 Controls for
Low Pressure Applications
The P70, P72, and P170 controls for low pressure
applications are designed primarily for low-pressure
cut-out control, pump-down control, and capacity
control on commercial refrigeration and air
conditioning applications.
These controls are available in several pressure
ranges and are compatible with most common
refrigerants. They may also be used on other
noncorrosive fluid applications. Ammonia compatible
models are also available.
Controls also are available in several different
electrical ratings and switch configurations. The P72
models provide direct control of 208-240 volt motors
up to 5 horsepower.
Figure 1: P70AB-12 Low Pressure Control
Features and Benefits
All Steel Case and Cover Built to provide long lasting, rugged protection
for internal components
“Sight-Set” Calibrated
Pressure Adjustment
Displays a visible pressure scale, fully
adjustable through the range without
removing the cover (on NEMA 1 enclosure
models)
MICRO-SET® Differential
Option
Allows for precise control on critical low
pressure applications
Manual Reset Lockout
Option
Provides “trip-free” low pressure lockout that
cannot be overridden or reset until pressure
returns to specified level
Limited Knob Adjustment
Option
Restricts control adjustment ranges and
deters tampering and over-adjustment
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