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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2 of 3
Controls for Dual Pressure Applications (Continued)
Note: For information on models not listed, please contact Johnson Controls/Penn Refrigeration Application Engineering at 1-800-275-5676.
Technical Specifications
All Range Controls for Non-Corrosive Refrigerants (Continued)
P170LB-1C
1
SPST 20 in.Hg
to 100
(-68 to 690)
Min 7 (48)
Max 50 (345)
100 to 500
(690 to 3447)
Fixed Approx. 65 (448) 1/4 in. Male
Flare
Connector
Low CUT OUT
P170MA-1C
1
Lockout Requires Manual Reset None
P170NA-1C Fixed (Manual
Reset)
All Range Ammonia Compatible Controls
P70LA-2C
1
SPST 20 in. Hg to
100
(-68 to 690)
Min 7 (48)
Max 50 (345)
100 to 500
(690 to 3447)
Fixed Approx. 65 (448) 1/4 in.
Female NPT
Connector
None
P70MA-2C
1
Lockout Requires Manual Reset
1. Control models with high pressure side (only) that are UL Listed as Refrigeration Pressure Limiting Controls.
Maximum Pressures
Pressure Low Side High Side
All Range MICRO-SET
Maximum Working Pressure 100 psig (552 kPa) 80 psig (690 kPa) 500 psig (3447 kPa)
Maximum Overpressure 325 psig (2241 kPa) 525 psig (3620 kPa) 525 psig (3620 kPa)
Selection Chart for Standard Model P70, P72, and P170 Dual Pressure Controls (Part 2 of 2)
Code
Number
Switch
Action
Low Pressure Side psig (kPa) High Pressure Side psig (kPa) Pressure
Connector
Limited Knob
Adjustment
Range Differential Range Differential (Non-Adjustable)
M1
L1
L2
Load
Low
High
Low side opens Line
to M1 on pressure drop.
High side opens Line
to M1 on pressure rise.
Line
p7sdual_wir_spst.eps
Typical Wiring for SPST Switch
(P70L, M, and N, and P170L, M, and N
Models)
L1
L2
Low
High
Load
Line
Line
M1
M2
Alarm
Circuit
Power
Alarm
Low side opens Main
circuit (Line to M2),
and closes auxiliary
circuit (Line to M1)
on pressure drop.
High side opens Main
circuit (Line to M2),
and closes auxiliary
circuit (Line to M1)
on pressure rise.
p7sdual_wir_4-2.eps
Typical Wiring for 4-wire, 2-circuit Switch
(P70P, Q and R Models)
L1
L2
Low
High
Load
Line
Line
M1
M2
Low side opens Line to M1 and
Line to M2 on pressure drop.
High side opens
Line to M1 and
Line to M2 on
pressure rise.
L3*
*(L3 is third supply line in 3-phase applications.)
p7sdual_wir_pst.eps
Typical Wiring for DPST Switch
(P72L,M,and N Models)
1
2
3
L1
L2
High
Alarm
Load
Low
Alarm
1
3
2
High
Low
High side switch opens
1 to 2 and closes 1 to 3
on pressure rise.
Low side switch opens
1 to 2 and closes 1 to 3
on pressure drop.
p7sdual_wir_2spdt_asdual.eps
Two SPDT Switches Wired as a Dual Pressure Control
(Switching a Single Load with Optional High Side
Alarm and Low Side Alarm) (P70S and P170S Models)
1
2
3
L1
L2
High
Load
High
Alarm
Low
Load
Low
Alarm
1
3
2
High
L
o
w
High side switch opens
1 to 2 and closes 1 to 3
on pressure rise.
Low side switch opens
1 to 2 and closes 1 to 3
on pressure drop.
p7sdual_wir_2spdt_-diff.eps
Two SPDT Switches Wired to Control Two Different
Loads, (Optional High Side Alarm and Low Side Alarm)
(P70S and P170S Models)