Johnson Controls P70 Manual
Controls for low pressure applications
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Also See for P70:
- Installation instructions manual (16 pages) ,
- Product/technical bulletin (12 pages) ,
- Product/technical bulletin (26 pages)
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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.
All Steel Case and Cover
"Sight-Set" Calibrated
Pressure Adjustment
MICRO-SET™ Differential
Option
Manual Reset Lockout
Option
Limited Knob Adjustment
Option
© 2000 Johnson Controls, Inc.
Code No. LIT-125453
P70, P72, and P170 Controls for
Low Pressure Applications
Features and Benefits
Built to provide long lasting, rugged protection
for internal components
Displays a visible pressure scale, fully
adjustable through the range without
removing the cover (on NEMA 1 enclosure
models)
Allows for precise control on critical low
pressure applications
Provides "trip-free" low pressure lockout that
cannot be overridden or reset until pressure
returns to specified level
Restricts control adjustment ranges and
deters tampering and over-adjustment
Pressure Controls Section P
Product/Technical Bulletin
Figure 1: P70AB-12 MICRO-SET
Control
Master Catalog 125
Issue Date 0900
TM
Low Pressure
1
www.johnsoncontrols.com
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Table of Contents
Related Manuals for Johnson Controls P70
Summary of Contents for Johnson Controls P70
- Page 1 Issue Date 0900 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.
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Page 2: Operation
These controls are available in several pressure ranges and are compatible with most common refrigerants. They may also be used on air, water, and other non-corrosive fluid applications. Ammonia compatible models are also available. P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin... - Page 3 (13) Figure 3: Dimensions for Low Pressure Controls with NEMA 3R Enclosure, in. (mm) Note: These dimensions are nominal and are subject to accepted manufacturing tolerances and application variables. P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin...
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Page 4: Pressure Connections
Coil and Secure Excess Capillary Tubing Carefully loop any excess capillary tubing into smooth, circular coils (approximately 3 in. diameter). Securely fasten the coiled tubing. P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin... - Page 5 Figure 6: Typical Wiring for SPDT Switch (P70E, F Models) IMPORTANT: Use terminal screws furnished in the contact block. Using other terminal screws will void the warranty and may damage the switch. P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin...
- Page 6 M2 to Line) Cut In Cut Out Double-Pole Single-Throw (DPST) (Closes M1 to Line and (Opens M1 to Line and P72C, P72D Open-high M2 to Line) M2 to Line) P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin...
- Page 7 Turn screw clockwise to raise low event. Micro-Set Controls: Turning the differential screw changes the differential setting. Turn screw clockwise to increase DIFFERENTIAL. Figure 9: Adjusting P70, P72, and P170 Controls for Low Pressure Applications P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin...
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Page 8: Manual Reset Operation
(at least three) at normal operating conditions. Use reliable pressure gauges to verify proper control settings and equipment operation. P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin... -
Page 9: Ordering Information
Figure 11 illustrates the pressure connection styles available on P70, P72, and P170 control models. Contact your Johnson Controls/PENN Authorized Representative for availability and price. Table 2: Standard P70, P72, and P170 Controls for Low Pressure Applications Code Switch Range... - Page 10 Table 3: P70, P72, and P170 Pressure Control Identification Matrix P70 Various pressure connection styles available on many models (See Figure 11.) P170 1/4 in. male flare pressure connection only (Style 5, see Figure 11.) P72 DPST switch only, 3/4 in. conduit opening on most models, (E, F, G, H, J, and K, models not available)
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Page 11: Electrical Ratings
48.0 36.0 19.8 18.0 Amperes Non-Inductive 16.0 Amperes Pilot Duty (for both 125 VA at 24 to 600 VAC; 57.5 VA at 120 to 300 VDC sets of contacts) P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin... -
Page 12: Specifications
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, contact Refrigeration Application Engineering at (414) 524-5535. Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
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