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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
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Repair Information
If the P70, P72, and P170 Series Controls
for Low Pressure Applications fail to
operate within their specifications, replace
the units.
For a replacement control,
contact the nearest Johnson
Controls®
representative.
P70, P72, and P170 Series Controls for Low Pressure Applications
Description
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 to 240 volt single-phase motors up to
3 horsepower, and 208 to 220 volt
three-phase motors up to 5 horsepower.
Refer to the P70, P72, and P170 Series
Controls for Low Pressure Applications
Product Bulletin (Part No. 24-7664-2608) for
important product application information.
Features
• 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
Applications
NEMA 1 enclosures are standard on most
models.
• P70A and P170A models with
single-pole, single-throw (SPST)
Open Low switch action are the most
popular models, and are typically used for
low pressure cut-out and pump-down
control.
• P70 and P170 models are also available
with SPST Open High switch action, and
are typically used for capacity control.
Models with single-pole, double-throw
(SPDT) or four-wire, two-circuit switch
action allow users to install alarm devices
or other control circuits.
• P72 models have a double-pole,
single-throw (DPST) switch with
load-carrying contacts that can provide
direct control of 208 to 240 V single-phase
motors up to 3 horsepower, and 208 to 220
V 3-phase motors up to 5 horsepower. See
the DPST Electrical Ratings (P72A, B, C,
and D Models) that follow.
P70AB-12 MICRO-SET
Low Pressure Control
Standard Electromechanical Pressure Controls
Code No. LIT-1900170