Johnson Controls PENN P70 Series - User Manual

Master Catalog 125
Pressure Controls Section P
Product/Technical Bulletin P70
Issue Date 0900
© 2000 Johnson Controls, Inc. 1
Code No. LIT-125455 www.johnsoncontrols.com
The P70, P72, and P170 controls for dual pressure
applications are designed primarily for use as
combination high and low pressure controls on
commercial refrigeration and air conditioning
applications.
These controls are available in several pressure
ranges and are compatible with most common
refrigerants. Ammonia compatible models are also
available.
These controls respond directly to system pressure
changes on both high and low sides, and can provide
single-device control of the compressor.
Controls are available in several different electrical
ratings and switch configurations, including
independent high and low pressure switches
(on P70S and P170S models). 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.
Figure 1: P70SA-1 Dual Pressure Control
Features and Benefits
❑ All Steel Case and Cover Provides long lasting, rugged protection for
internal components
❑ “Sight-Set” Calibrated
Pressure Adjustments
Provides visible pressure scales, fully
adjustable through all ranges without
removing the cover
❑ MICRO-SET Differential
Adjustment Option
Allows for precise pressure control of low
pressure applications
❑ Independent High and Low
Pressure Switches
(P70S and P170S Models)
Satisfies a variety of dual pressure application
wiring requirements with a single versatile
control
❑ Convertible, High Pressure
Reset–Auto Reset or
Manual Reset Lockout
(P70S and P170S Models)
Reduces inventory—one control can be
adapted to several dual pressure applications
in the field
P70, P72, and P170 Controls for
Dual Pressure Applications

Johnson Controls PENN P70 Series Specifications

General

Brand	Johnson Controls
Model	PENN P70 Series
Category	Control Unit
Language	English

Summary

P70, P72, and P170 Controls for Dual Pressure Applications

Features and Benefits

Application Overview

Important Safety and Operational Notes

Crucial safety and operational considerations for using these pressure controls.

Ammonia Handling Caution

Warning regarding ammonia's corrosiveness and proper installation practices.

Control Operation Mechanism

Mounting Instructions

Mounting Precautions and Safety

Instructions for proper mounting to prevent damage and ensure correct operation.

Wiring Procedures

Electrical Safety Warning

Critical warning about disconnecting power before making electrical connections.

SPST Switch Wiring

4-wire, 2-circuit Switch Wiring

DPST Switch Wiring

Control Adjustments

All-Range Control Adjustments

Details on adjusting CUT IN, CUT OUT, and differential for all-range controls.

MICRO-SET Control Adjustments

Explains MICRO-SET adjustment for CUT IN and differential settings.

High Side Control Adjustments

Information on adjusting the CUT OUT setpoint for high side controls.

Adjustment Pointer Safety

Caution against adjusting pointers beyond indicator marks to prevent damage.

Manual Reset Operation

Setting Low Side CUT IN Point

Procedure for setting the low side CUT IN setpoint using the range screw.

Adjusting Low Side Differential

Setting High Side CUT OUT Point

Convertible Reset Configuration

Convertible High Pressure Reset

Changing High Pressure Reset Operation

Electrical Ratings