Product Overview

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. © 2009 Johnson Controls, Inc.
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• P72 models have a Double-Pole Single-
Throw (DPST) switch with load-carrying
contacts that can provide direct control of
208-240 V single-phase motors up to
3 horsepower, and 208-220 V 3-phase
motors up to 5 horsepower. Refer to DPST
Electrical Ratings (P72A, B, C, and D
Models) on page 3.
P70, P72, and P170 Series
Controls for Low Pressure Applications
Code No. LIT-1900170
Issued February 1, 2009
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
208-240 volt single-phase motors up to 3
horsepower, and 208-220 volt 3-phase
motors up to 5 horsepower.
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 4-wire, 2-circuit switch action
allow users to install alarm devices or other
control circuits.
Selection Chart for Standard P70, P72, and P170 Controls for Low Pressure Applications
Note: To order models not listed in the selection chart, please contact Johnson Controls/Penn Refrigeration Application Engineering at
1-800-275-5676.
Code
Number
Switch
Action
Range
psig (kPa)
Differential
psi (kPa)
Pressure
Connection
Max.
Overpressure
Max. Work-
ing Pressure
Limited Knob
Adjustment
MICRO-SET Controls (For Non-Corrosive Refrigerants)
P70AB-12C SPST Open Low 12 in. Hg to 80
(-41 to 551)
Minimum 5 (34)
Maximum 35 (241)
36 in. Cap. with 1/4 in. Flare Nut 525 psig
(3617 kPa)
80 psig
(551 kPa)
Supplied,
but not assembled
P170AB-12C 1/4 in. Male Flare Connector
P70EA-14C SPDT
1 to 3 Open Low
1 to 2 Close Low
36 in. Cap. with 1/4 in. Flare Nut None
P170EA-14C 1/4 in. Male Flare Connector
ALL-RANGE Controls (For Non-Corrosive Refrigerants)
P70AB-1C SPST Open Low 20 in. Hg
to 100
(-68 to 690)
Minimum 7 (48)
Maximum 50 (345)
1/4 in. Male Flare Connector 325 psig
(2239 kPa)
100 psig
(690 kPa)
Supplied,
but not assembled
P70AB-2C 36 in. Cap. with 1/4 in. Flare Nut
P70BA-1C Manual Reset
Lockout
None
P70BA-10C 1/4 in. Male Flare Connector
P70EA-10C SPDT
1 to 3 Open Low
1 to 2 Close Low
5 (34)
Fixed
P72AA-1C DPST Open Low Minimum 7 (48)
Maximum 50 (345)
36 in. Cap. with 1/4 in. Flare Nut
P72AB-1C Mounted on
Differential Screw
P170AB-2C SPST Open Low 1/4 in. Male Flare Connector
P70CA-1C SPST Open High 36 in. Cap. with 1/4 in. Flare Nut None
P170CA-1C 1/4 in. Male Flare Connector
ALL-RANGE Controls (Ammonia-Compatible)
P70AA-5C SPST Open Low 20 in. Hg to
100
(-68 to 690)
Minimum 7 (48)
Maximum 50 (345)
1/4 in. SS Female NPT 325 psig
(2239 kPa)
100 psig
(690 kPa)
None
P70CA-4C SPST Open High
P70GA-11C 4-wire, 2-circuit
Line M1 Close Low
Line M2 Open Low
P70HA-3C Manual Reset
Lockout
P70AB-12 MICRO-SET
TM
Low Pressure Control