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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
R-96
P70, P72, and P170 Series Controls for High Pressure Applications
Description
The P70, P72, and P170 Controls for high
pressure applications are designed primarily
for high pressure cut-out control,
head-pressure control, and condenser fan
cycling control on commercial refrigeration
and air conditioning applications.
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.
Several different electrical ratings and switch
configurations are available. 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.
Refer to the P70, P72, and P170 Series
Controls for High Pressure Applications
Product/Technical Bulletin (LIT-125454) for
important product application information.
Features
• all-steel case and cover provides 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)
• manual reset lockout option provides
trip-free lockout that cannot be overridden
or reset until pressure returns to specified
level
• variety of available pressure connection
styles allows greater flexibility when
mounting control and adapting pressure
connections to field application
requirements
Applications
• P70C, P70D P170C and P170D models
with single-pole, single-throw (SPST)
Open High switch action are the most
popular models, and are typically used for
high-pressure cutout. The Cmodels are
automatic reset. The D models have a
manual reset lockout mechanism. Some
P70C, P70D P170C and P170D models
are UL Listed as refrigeration pressure
limiting controls.
• P70A and P170A models are available
with SPST Open Low switch action, and
typically are used for condenser fan
cycling control.
• P70 and P170 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 208-240 V single-phase
motors up to 3 horsepower, and 208-220 V
3-phase motors up to 5 horsepower. See
the DPST Electrical Ratings (P72A, B, C,
and D Models) that follow.
NEMA 1 enclosures are standard on most
models.
Repair Information
If the P70, P72, and P170 Series Controls
for High Pressure Applications fail to
operate within their specifications, replace
the units.
For a replacement control,
contact the nearest Johnson
Controls®
representative.
Selection Chart (Part 1 of 2)
Product Code
Number
Switch
Action
Range
psi (kPa)
Differential
psi (kPa)
Pressure
Connection
Max. Working
Pressure
Condenser Fan Cycling Controls (for Non-Corrosive Refrigerants)
P70AA-118C SPST Open Low 100 to 400
(690 to 2,758)
Minimum 35 (241) Maximum 200 (1,379) 36 in. Capillary
with 1/4 in. Flare Nut
475 psig
(3,275 kPa)
P72AA-27C DPST Open Low
P170AA-118C SPST Open Low 1/4 in. External Flare Connector
All Range Controls (for Non-Corrosive Refrigerants)
P70CA-2C
1
SPST Open High 50 to 500
(345 to 3,448)
Minimum 60 (414); Maximum 150 (1,034) 1/4 in. External Flare Connector 525 psig
(3,620 kPa)
P70CA-3C
1
36 in. Capillary
with 1/4 in. Flare Nut
P70DA-1C
1
Manual Reset Lockout
P70KA-1C Four-wire, Two-circuit
Line-M1 Close High
Line-M2 Open High
P72CA-2C
1
DPST Open-high Minimum 60 (414); Maximum 150 (1,034)
P72DA-1C
1
Manual Reset Lockout
P170CA-3C
1
SPST Open High Minimum 60 (414); Maximum 150 (1,034) 1/4 in. External Flare Connector
P170DA-1C Manual Reset Lockout
P170KA-1C Four-wire, Two-circuit
Line-M1 Close High
Line-M2 Open High
P70CA-3 High Pressure Cutout Control
Standard Electromechanical Pressure Controls
Code No. LIT-1900171