Johnson Controls PENN P70 Series User manual

Master Catalog 125

Pressure Controls Section P

Product/Technical Bulletin

Issue Date 0900

Code No. LIT-125453 www.johnsoncontrols.com

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.

Figure 1: P70AB-12 MICRO-SETTM Low Pressure

Control

Features and Benefits

❑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

P70, P72, and P170 Controls for

Low Pressure Applications

2 P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin

Application

P70, P72, and P170 controls for low pressure

applications are designed primarily to provide low-side

pressure control on commercial refrigeration and air

conditioning applications.

IMPORTANT: Except for those models listed as

Refrigeration Pressure Limiting

Controls, the P70, P72, and

P170 Series controls for low

pressure applications are

intended to control equipment

under normal operating

conditions. Where failure or

malfunction of the P70, P72, and

P170 pressure controls could

lead to an abnormal operating

condition that could cause

personal injury or damage to the

equipment or other property,

other devices (limit or safety

controls) or systems (alarm or

supervisory systems) intended to

warn of, or protect against, failure

or malfunction of the P70, P72,

and P170 pressure controls must

be incorporated into and

maintained as part of the control

system.

•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.

•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 hp, and 208-220 V 3-phase motors

up to 5 hp. Refer to Table 8.

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.

The MICRO-SET option provides fine adjustment of

the differential setting for precision pressure control of

critical low pressure applications.

Some models are available with Limited Knob

Adjustment, which restricts adjustment of the

pressure settings and deters overadjustment or

tampering. See Limited Knob Adjustment.

CAUTION: Equipment Damage Hazard.

Ammonia is very corrosive to

copper and brass components.

On ammonia applications, only

ammonia-compatible control

models and pressure

connections must be used. The

pressure control must be

mounted separately from the

electrical cabinet and all

electrical piping sealed to

prevent ammonia from migrating

to electrical components.

The Manual Reset Lockout mechanism does not

allow the pressure control to automatically reset after

the control has cut out, providing shutdown capability

for unmonitored equipment. See Manual Reset

Operation.

NEMA 1 enclosures are standard on most models.

NEMA 3R enclosures are also available.

Operation

A pressure-actuated bellows on the control is

connected to a pressure tap on the controlled

equipment by a capillary or a field-installed hose

(except ammonia models). The bellows responds to

equipment pressure changes and operates a

snap-action electrical switch.

P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 3

Dimensions

Two Mounting Holes

10-32 UNF-2B Thread

5/16

(9)

3-1/16

(77)

1-5/16

(34)

1/16

15/16

(24)

2-1/16

(52) 1-1/4

(32)

3/16

(5)

3/16

(5) Diameter

3-1/4

(83)

13/16

(20)

2-15/16

(74)

1-11/16

(43)

1-3/4

(44)

Capillary or

Connector

as Specified

3-1/4

(83)

5/16

(8)

(25)

1-1/8

(29)

1-7/8

(48)

5/16

(8)

3/8 X3/16

(5)

Diameter

Mounting Hole

7/8

(22) Conduit Hole

Mounting Hole

3/16

(5)

Diameter

(1/2 in. 3/4 in. Trade Size)

1-1/8

(28)

Figure 2: Dimensions for Low Pressure Controls with NEMA 1 Enclosure, in. (mm)

4-1/16

(103)

4-1/16

(103)

5/8

(16)

5/8

(16)

(79)

2-15/16

(74)

(70)

3/16

(5)

1/2

(13)

(25)

2-11/16

(68)

3/8

(10)

1-1/4

(32)

1-3/4

(44)

7/16

(11)

1-9/16

1/2

(13)

3/4-NPSM

Threaded

Rigid Conduit

Connector

Four Mounting Holes 5/16

(8) Diameter

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.

4 P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin

Mounting

Mount the control in an accessible position, where the

control and pressure connection line will not be subject

to damage.

CAUTION: Equipment Damage Hazard.

Mount the pressure control

upright and level. Position the

pressure connection line to

allow drainage away from

control bellows. Pressure tap

points must be located on the

top side of the refrigerant lines.

This reduces the possibility of

oil, liquids, or sediment

accumulating in the pressure

connection line or control

bellows, which could cause

control malfunction.

Controls with NEMA 1 enclosures may be mounted on

flat, horizontal or vertical surfaces.

Use two screws or bolts through the two outer holes

on the back of the control case when mounting control

directly to a flat vertical surface.

Use the two inner holes with the Universal Mounting

Bracket (and screws supplied) when mounting the

control to a flat horizontal surface.

IMPORTANT: Use only the mounting screws

provided with the Universal

Mounting Bracket to avoid

damaging internal components.

Do not warp control case when

mounting control to uneven

surface.

Controls with NEMA 3R enclosures are designed to be

mounted in a level, upright position with the sensing

element and conduit connection facing down. All

gaskets must be in place. Mounting NEMA 3R

enclosures in any position other than upright and level

may trap water in the enclosure and submerge internal

control components.

Use mounting screws

provided. Longer screws

may damage control.

Mounting Holes for

Flat Vertical Surfaces

Universal Mounting

Bracket

(Part No. 271-51)

Mount bracket to

horizontal surface.

Figure 4: Mounting the P70, P72, and P170 Low

Pressure Control with NEMA 1 Enclosure

Pressure Connections

P70, P72, and P170 low pressure controls are

connected to the controlled equipment by a capillary or

flexible hose (except ammonia models). Controls are

available with a variety of pressure connection styles.

See Figure 11 for pressure connection styles.

Follow these guidelines when installing pressure

connection lines.

IMPORTANT: If these controls are installed on

equipment that contain

hazardous or regulated

materials, such as refrigerants or

lubricants, the installer and user

should observe all regulations

governing the handling and

containment of those materials.

Avoid Sharp Bends in the Capillary Tube

Sharp bends can weaken or kink capillary tubes, which

may result in leaks or restrictions.

Allow for Slack in the Capillary Tube

Leaving a little slack in the capillary tube helps

dampen mechanical vibration that can weaken or

damage capillary tubes.

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 5

Avoid Contact between the Capillary Tubing and

Sharp or Abrasive Objects

Vibration of sharp or abrasive objects in contact with

capillary tubes can result in leaks.

Do Not Overtighten Flare Nuts on Pressure

Connection Line Fittings

Overtightening flare connections may damage the

threads on the flare nuts or flare connectors, and may

result in leaks. Do not exceed 9 ft·lb (12 N·m) of torque

when tightening brass flare connections.

Avoid Severe Pressure Pulsation at Pressure

Connections

Install pressure connection lines to pressure tap points

away from the compressor, to minimize the effects of

pressure pulsation from reciprocating compressors.

IMPORTANT: After installing control, evacuate

control and pressure connection

lines in accordance with

applicable EPA and other

regulations, to remove air,

moisture, and other

contaminants.

Wiring

P70, P72, and P170 controls for low pressure

applications are available with several switch options

and electrical ratings. Check the label inside the

control cover for model number, switch action, and

electrical rating. (See Table 1 for switch actions and

models.)

Check the wiring terminal designations on the control

switch-block and refer to the following guidelines and

applicable wiring diagrams, when wiring the control.

WARNING: Risk of Electrical Shock.

Disconnect power supply before

making electrical connections to

avoid possible electrical shock or

equipment damage.

IMPORTANT: Use terminal screws furnished in

the contact block. Using other

terminal screws will void the

warranty and may damage the

switch.

IMPORTANT: Make all wiring connections in

accordance with the National

Electrical Code and all local

regulations. Use copper

conductors only. Do not exceed

the control’s electrical rating.

Load

Line

Open-High switch action:

opens on pressure rise.

(C and D Models)

Load

Line

Open-Low switch action:

opens on pressure drop.

(A and B Models)

Figure 5: Typical Wiring for SPST Open-Low

Switch and Open-High Switch

(P70A, B, C, D, and P170A, C, D, Models)

Load

Alarm

1 to 3 opens, and 1 to 2 closes

on pressure rise.

Figure 6: Typical Wiring for SPDT Switch

(P70E, F Models)

6 P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin

Line

Load

Line

Alarm

Circuit

Power

Alarm

Main circuit (Line to M2) opens and

auxiliary circuit (Line to M1) closes

on pressure rise.

Figure 7: Typical Wiring for 4-wire 2-circuit Switch

(P70G and H Models)

Line

Load

Line

Line to M1 and Line to M2 open on pressure drop.

L3*

*(L3 is third supply line in 3-phase applications.)

Figure 8: Typical Wiring for DPST Switch

(P72A and B Models)

Table 1: Single Pressure Controls Switch Action, Low Event, High Event, and Models

Switch and Action Low Event High Event Models

Single-Pole Single-Throw

(SPST) Open-low

Cut Out

(Opens Line to M1)

Cut In

(Closes Line to M1) P70A, P70B, P170A

Single-Pole Single-Throw

(SPST) Open-high

Cut In

(Closes Line to M1)

Cut Out

(Opens Line to M1) P70C, P70D, P170C, P170D

Single-Pole Double-Throw

(SPDT)

Opens 1 to 2 and

closes 1 to 3

Closes 1 to 2 and

Opens 1 to 3 P70E, P70F

4-wire, 2-circuits,

1 N.O., 1 N.C.

Open-low

Cut Out

(Opens M2 to Line and

Closes M1 to Line)

Cut In

(Closes M2 to Line and

Opens M1 to Line)

P70G, P70H

4-wire, 2-circuits,

1 N.O., 1 N.C.

Open-high

Cut In

(Closes M2 to Line and

Opens M1 to Line)

Cut Out

(Opens M2 to Line and

Closes M1 to Line)

P70J, P70K, P170K

Double-Pole Single-Throw

(DPST)

Open-low

Cut Out

(Opens M1 to Line and

M2 to Line)

Cut In

(Closes M1 to Line and

M2 to Line)

P72A, P72B

Double-Pole Single-Throw

(DPST)

Open-high

Cut In

(Closes M1 to Line and

M2 to Line)

Cut Out

(Opens M1 to Line and

M2 to Line)

P72C, P72D

P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 7

Adjustments

Adjustment of the P70, P72, and P170 low pressure

controls vary, depending on the model. The following

guidelines and diagrams illustrate the procedures for

adjusting these controls. Refer to the product label

inside the control cover for model number and switch

action, and check the front of the control cover to

determine if the control is All-Range or MICRO-SET.

(Refer to Table 1 for switch action, low event, and

high event of the various control models.)

All-Range Controls

All-Range pressure controls have a scaleplate that

displays the CUT IN and CUT OUT setpoints. (See the

visible scale on control.) Turning the range screw

adjusts the CUT IN and CUT OUT setpoints up or

down simultaneously, while maintaining a constant

pressure differential. Turning the differential screw

adjusts only the low event on the left side of the scale,

and changes the pressure differential.

MICRO-SET Controls

MICRO-SET low-side pressure controls have a

scaleplate that displays the CUT IN setpoint and

DIFFERENTIAL setting. (See visible scale on control.)

Turning the range screw adjusts the CUT IN setpoint

on the right side of the scale. Turning the differential

screw adjusts the DIFFERENTIAL setting on the left

side, which changes the resulting cut-out pressure.

IMPORTANT: Do not adjust pointers beyond

the highest or lowest indicator

marks on the control’s pressure

scale. Adjusting pointers beyond

indicator marks may damage

screw threads and cause

inaccurate control operation.

Step 1.

Step 2.

Turn screw clockwise to raise low event.

Turn screw clockwise to increase DIFFERENTIAL.

Micro-Set Controls:

Turning the differential screw changes the differential setting.

All-Range Controls:

Turning the differential screw changes the low event.

Figure 9: Adjusting P70, P72, and P170 Controls for Low Pressure Applications

8 P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin

Limited Knob Adjustment

Some models are supplied with a Limited Knob

Adjustment kit, which limits adjustments to the

pressure control and help to deter over-adjustment or

tampering.

To lock the differential setting and allow limited

adjustment of the low event and high event setpoints,

install the knob on the range screw.

To lock the high event setpoint and allow limited

adjustment of the low event setpoint (on All-Range

controls) or differential setting (on MICRO-SET

controls), install the knob on the differential screw.

To install the Limited Knob Adjustment: kit:

1. Adjust control pointers to desired high event and

low event setpoints (on All-Range controls), or

differential setting (on MICRO-SET controls).

2. Place spacer on the proper adjustment screw.

•All-Range controls (with Limited Knob

Adjustment kit ) have round and knurled

adjustment screws—the spacer must always

be placed on the range screw.

•MICRO-SET controls have square adjustment

screws, always place the spacer on the same

adjustment screw as the knob.

3. Place the indicator plate as shown in Figure 10, to

lock either the range screw or differential screw in

the desired setting.

4. Install the knob on the other adjustment screw,

and tighten the setscrew. A stop on the bottom of

the knob limits screw adjustment to less than one

turn.

IMPORTANT: Use the pressure control settings

recommended by the manufacturer

of the controlled equipment. Do not

exceed the pressure ratings of the

controlled equipment or any of its

components when checking

pressure control operation or

operating the controlled equipment.

IMPORTANT: After installing and adjusting

pressure control, and before

leaving installation, cycle the

controlled equipment several times

(at least three) at normal operating

conditions. Use reliable pressure

gauges to verify proper control

settings and equipment operation.

Adjustment Knob with Set Screw

Indicator Plate

Spacer*

Installation of Knob Kit to

Lock Differential Screw and

Allow Limited Adjustment of

Range Screw

Installation of Knob Kit to

Lock Range Crew, and

Allow Limited Adjustment of

Differential Screw

Range Screw

*On MICRO-SET controls, place spacer on same adjustment

screw as knob.

On All-Range controls, always place spacer on range screw.

Figure 10: Installing Limited Knob Adjustment Kit

Manual Reset Operation

Pressure controls with the Manual Reset option, lock

out when they reach cut out pressure and must be

manually reset by the user to restart the controlled

equipment. The manual reset mechanism is “trip-free”

and cannot be over-ridden by blocking or tying the

reset button down.

On equipment with locked out controls, first determine

and remedy the cause of the lockout, and allow the

sensed pressure to return to the cut-in setpoint. Then,

press and release the reset button on the front of the

control to restore operation of the controlled

equipment.

P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 9

Ordering Information

P70, P72, and P170 controls for low pressure

applications are available in a variety of standard and

non-standard models.

Table 2 lists the standard models available through

most Johnson Controls/PENN Authorized Distributors.

Table 3 is a model identification matrix that depicts all

the potential P70, P72, and P170 control models. Not

all control models depicted in Table 3 are

manufactured and available.

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

Number

Switch

Action

Range

psig (kPa)

Differential

psi (kPa)

Pressure

Connection

Limited Knob

Adjustment

MICRO-SET Controls (For Non-Corrosive Refrigerants)

P70AB-12 36 in. Cap. with

1/4 in. Flare Nut

P170AB-12

SPST

Open Low

12 in. Hg

to 80

(-41 to 551)

Minimum 5 (34)

Maximum 35 (241) 1/4 in. Male Flare

Connector

Supplied,

but not assembled

ALL-RANGE Controls (For Non-Corrosive Refrigerants)

P70AB-1 1/4 in. Male Flare

Connector

P70AB-2

SPST

Open Low 36 in. Cap. with

1/4 in. Flare Nut

Supplied,

but not assembled

P70CA-1 SPST

Open High

Minimum 7 (48)

Maximum 50 (345)

36 in. Cap. with

1/4 in. Flare Nut None

P70EA-10

SPDT

1 to 3 Open Low

1 to 2 Close Low

5 (34)

Fixed

1/4 in. Male Flare

Connector None

P72AA-1 None

P72AB-1

DPST

Open Low

36 in. Cap. with

1/4 in. Flare Nut Mounted on

Differential Screw

P170AB-2 SPST

Open Low

Mounted on

Differential Screw

P170CA-1 SPST

Open High

20 in. Hg

to 100

(-68 to 690)

Minimum 7 (48)

Maximum 50 (345)

1/4 in. Male Flare

Connector None

ALL-RANGE Controls (Ammonia Compatible)

P70AA-5 SPST

Open Low

P70CA-4 SPST

Open High

20 in. Hg

to 100

(-68 to 690)

Minimum 7 (48)

Maximum 50 (345) 1/4 in. SS Female NPT None

Note: See Dimensions and Specifications for additional model information including Maximum Working Pressure and

Maximum Over-pressure ratings.

10 P—P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin

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)

ASPST switch (DPST in P72), Open-low, automatic reset

BSPST switch (DPST in P72), Open-low, manual reset lockout

CSPST switch (DPST in P72), Open-high, automatic reset

DSPST switch (DPST in P72), Open-high, manual reset lockout

E1 hp SPDT switch (n/a in P72), automatic reset

F1/4 hp SPDT switch (n/a in P72), automatic reset

G4-wire, 2-circuit switch (n/a in P72), main switch Open-low, automatic reset

H4-wire, 2-circuit switch (n/a in P72), main switch Open-low, manual reset lockout

J4-wire, 2-circuit switch (n/a in P72), main switch Open-high, automatic reset

K4-wire, 2-circuit switch (n/a in P72), main switch Open-high, manual reset lockout

ANEMA 1 enclosure, no adjustment knob

BNEMA 1 enclosure, with adjustment knob

CNo enclosure, no adjustment knob

DNo enclosure, with adjustment knob

ENEMA 3R enclosure, no adjustment knob

GNEMA 3R enclosure, no adjustment knob

HNEMA 1 enclosure, no adjustment knob, 1/4 in. quick connects

JNEMA 1 enclosure with adjustment knob, 1/4 in. quick connects

NNEMA 1 enclosure no adjustment knob, transportation application

PNEMA 1 enclosure with adjustment knob, transportation application

SNEMA 3R enclosure, no adjustment knob, transportation application

Note: Not all combinations shown on this chart are available. To verify product availability and for quantity orders

of non-standard items, please contact Refrigeration Application Engineering at (414) 524-5535.

7/16 - 20 UNF-2A Thread;

1/4 in. SAE Male

Flare Connector*

1/4 - 18 NPT Female Thread;

Brass for Use with

Non-corrosive Refrigerants,

Stainless Steel for Use

with Ammonia

Copper Capillary with

1/4 in. SAE Female

Flare Connector

(Style 45 includes a

valve stem depressor.)

Copper Capillary with

1/4 in. Copper Sweat

Copper Capillary with

1/4 in. SAE Female

Flare Connector

with 90° Bend

*Note: Style 5, Connector may require a copper flare saver gasket, which must be purchased separately.1/4 in. SAE Male Flare

Style 13 or 45 Style 37 Style 34 Style 15 Style 5

Figure11: Pressure Connections Styles Available on P70, P72, and P170 Controls

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