Johnson Controls PENN P70 Series Manual

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Product/Technical Bulletin P

Issue Date 0205

Part No. 24-7664-2608, Rev. —

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.

These controls are available in several pressure

ranges and are compatible with most common

refrigerants. They may also be used on other

noncorrosive 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 motors

up to 5 horsepower.

Figure 1: P70AB-12 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

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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 cutout 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 motors (up to

5 hp). See 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 noncorrosive 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 over-adjustment or

tampering.

A Manual Reset Lockout option does not allow the

pressure control to reset automatically after cutout is

reached, and provides shutdown capability for

unmonitored equipment. The user must push the

button on the control cover after the cut-in pressure

has been reached.

NEMA 1 enclosures are standard on most models.

NEMA 3R enclosures are also available.

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.

Operation

A pressure-actuated bellows on the control is

connected to a pressure tap on the controlled system

by a capillary or a field-installed hose. The bellows

responds to system pressure changes and operates a

snap-action electrical switch.

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

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Dimensions

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

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.

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

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Mounting

Mount the control in an accessible position, where the

control and pressure connection line is not 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 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 the

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 the control case

when mounting the control to an

uneven surface.

Controls with NEMA 3R enclosures are designed to be

mounted in a level, upright position with the bellows

and conduit connection facing down. All gaskets must

be in place. Mounting these controls in any position

other than upright may trap water in the enclosure and

submerge internal control components.

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 system by a capillary or

flexible hose. These 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.

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

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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 the control,

evacuate the control and

pressure connection lines in

accordance with applicable

Environmental Protection Agency

(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 action 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 Electric Shock.

Disconnect power supply before

making electrical connections to

avoid possible electric shock or

equipment damage.

IMPORTANT: Use terminal screws furnished in

the switch 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.

Figure 5: Typical Wiring for SPST Open-Low

Switch and Open-High Switch

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

Figure 6: Typical Wiring for SPDT Switch

(P70E, F Models)

P70, P72, and P170 Controls for Low Pressure Applications Product/Technical Bulletin 5

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

(P70G, and H Models)

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 M2) Cut In

(Closes Line to M2) P70A, P70B, P170A

Single-Pole Single-Throw

(SPST) Open-high Cut In

(Closes Line to M2) Cut Out

(Opens Line to M2) 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-NO, 1-NC

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-NO, 1-NC

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

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

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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.

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

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

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Limited Knob Adjustment

Some control models are supplied with Limited Knob

Adjustment, 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:

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) 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.

Figure 10: Installing Limited Knob Adjustment Kit

Checkout Procedure for Low Pressure

Cut-out Controls

Use the following procedure to check control operation

on a typical low pressure cut-out application.

1. Check the product label on the inside of the

control cover, for model number and switch action.

(See Table 1 for low and high events that

correspond to control model and switch action.)

2. Attach a reliable gauge to the suction service port

and run the system at normal conditions.

3. Slowly front seat the suction valve and allow the

low side to pump down. Observe the control’s low

event switching pressure on the gauge.

4. Slowly back the suction valve off the front-seated

position and allow the low side pressure to rise.

Observe the control’s high event switching

pressure on the gauge.

5. Adjust settings as needed. (See Figure 9.) Repeat

checkout procedure if necessary.

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 adjusting control settings

and before leaving installation,

cycle the controlled system

several times (at least three) at

normal operating conditions. Use

reliable pressure gauges to verify

proper control settings and

equipment operation.

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.

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

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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 selection 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

Distributors 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)

Min 5 (34)

Max 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

Min 7 (48)

Max 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 Supplied on

Cut-out

P170AB-2 SPST

Open Low Supplied on

Cut-out

P170CA-1 SPST

Open High

20 in. Hg

to 100

(-68 to 690)

Min 7 (48)

Max 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)

Min 7 (48)

Max 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.

*Models (Code Number) that are UL Listed as refrigeration pressure limiting controls.

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

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