Johnson Controls P70 - User Manual

Master Catalog 125
Pressure Controls Section P
Product/Technical Bulletin
Issue Date 0900
© 2000 Johnson Controls, Inc. 1
Code No. LIT-125453 www.johnsoncontrols.com
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
non-corrosive 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
single-phase motors up to 3 hp, and 208-220 volt
3-phase motors up to 5 horsepower.
Figure 1: P70AB-12 MICRO-SET
TM
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
P70, P72, and P170 Controls for
Low Pressure Applications

Johnson Controls P70 Specifications