Johnson Controls Penn P28 Series Manuale utente

Master Catalog 125

Pressure Controls Section P

Product/Technical Bulletin P28

Issue Date 0498

Part No. 24-7664-605, Rev. A

Code No. LIT-125420

The P28 and P128 Series Lube Oil Controls provide

dependable and economical oil pressure cut-out for

pressure-lubricated refrigeration compressors. The

field-adjustable pressure differential of these controls

provides compressor operation according to the

manufacturer’s specifications. The P28 and P128

controls operate by measuring the net lube oil

pressure and de-energizing the compressor if the

pressure falls below the differential setpoint.

Manual or automatic reset models are available with

factory set and sealed time delays of 30, 45, 60, 90,

or 120 seconds (all time delays may not be available

on all models). The P128 is the same control as the

P28 but with 1/4 inch male flare pressure connections.

Figure 1: P128AA

Features and Benefits

❑Built-in Time Delay Relay

with Ambient Compensation

Minimizes timing fluctuations due to temperature

variations

❑Trip-free Manual Reset Provides manual reset that cannot be overridden

by pressing and holding the reset button

❑Replaceable Time Delay

Relay Assembly

Allows easy field replacement of the time delay

relay and terminal board

❑Available with Runlight and

Alarm Terminals

Allows the control to be wired for normal oil

pressure runlight signals and shutdown alarm

circuits for remote monitoring of oil pressure

status

P28 and P128 Series Lube Oil Controls

with Built-in Time Delay Relay

2 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin

Introduction

WARNING: Personal injury hazard. All

P28 and P128 controls are

designed as lubrication

protection controls. Failure of

the P28 or P128 could allow

the refrigeration compressor

to be damaged in a way that

may not be apparent upon

visual inspection. Follow

proper procedures and the

compressor manufacturer’s

instructions, as well as any

warning signs on or around

the equipment, when

discharging and

disassembling the

compressor.

Environmental damage

hazard. If leakage of sensed

media (such as refrigerant or

oil) can be harmful to the

environment, or hazardous in

any way, user must provide

for proper containment.

The P28 and P128 controls measure the net oil

pressure available to circulate oil throughout a

pressure-lubricated refrigeration system. The net oil

pressure is the difference between the oil pressure

at the pump discharge and the refrigerant pressure

in the compressor crankcase.

Example: If the oil pressure pump discharge reading

is 90 psi (621 kPa) and the crankcase

pressure is 70 psi (483 kPa), the net oil

pressure is 20 psi (138 kPa).

The P28 and P128 have a built-in time delay relay.

This relay allows the oil pressure to build up for the

time delay period before the compressor trips. This

also prevents nuisance lockouts due to intermittent

loss of oil pressure. The time delay relay is a

“trip free” device. The manual reset cannot be

overridden by pressing and holding the reset button.

Manual reset models are available with time delays

of 30, 45, 60, 90, or 120 seconds. Automatic reset

models are available with a 90-second time delay.

The time delay relay is compensated to minimize the

effect of ambient temperature variations. However,

the time delay relay will be affected by voltage

variations.

Dimensions

Figure 2: P28 or P128 Dimensions (in./mm)

Operation

When the compressor starts, the timer is energized

because the net oil pressure of the system is zero.

During normal operation, the net oil pressure should

build up to the pressure switch’s cut-out setting

(scale setting) plus the switch differential (3 to 5 psi

[21 to 34 kPa]) within the required time delay,

causing the time delay relay to de-energize.

If the net oil pressure does not rise to the cut-out

pressure setting plus the switch differential within the

required time delay, the time delay relay trips and

stops the compressor.

If the net oil pressure drops below the cut-out

pressure setting during the compressor’s run cycle,

the time delay relay energizes. If the net oil

pressure returns within the time delay, the time

delay relay de-energizes and the compressor

continues to operate normally. If the net oil pressure

does not return within the time delay, the control

shuts down and locks out the compressor.

P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 3

Example: Net oil pressure (oil pump pressure minus

crankcase pressure) required to the

bearings is 9 psi (62 kPa). The control

scale setting should be 9 psi (62 kPa).

The switch differential is 5 psi (34 kPa).

Upon initial start of the compressor, the

time delay relay energizes. If the net oil

pressure does not build up to 14 psi

(97 kPa), or the scale setting (9 psi) plus

the switch differential (5 psi), during the

time delay, the control breaks the circuit to

the compressor. If the pressure of 14 psi

(97 kPa) is reached during the time delay,

the time delay relay de-energizes and the

compressor continues to operate

normally.

Installation

Mounting

CAUTION: Equipment damage hazard.

●A P28AN or P28DN control used for

ammonia service must be mounted

separately from the electrical cabinet.

An ammonia leak could damage the

electrical circuitry.

●Do not use Johnson Controls/Penn

Ecosafe® hose tubing in applications

with ammonia or other corrosive

refrigerants. Corrosion could cause

tube breakage and refrigerant

leakage.

●Use only the mounting screws

supplied with the control. Damage to

internal components may occur if

other screws are used.

The P28 and P128 controls are not position

sensitive and can be mounted in any position.

Use the two mounting screw holes located on the

back of the control case to mount the control directly

to a wall or panel board. Mount the control so that

the pressure connections on the bellows are above

the crankcase liquid level of the equipment being

controlled.

Note: When mounting the control to a

compressor is required, a mounting bracket

(Part No. 271-51) is available.

Pressure Connections

CAUTION: Equipment damage hazard.

●Avoid sharp bends or kinks in the

capillary or tubing to avoid damage to

the capillary.

●Coil and secure excess capillary or

tubing. Because harmonic vibration

can break the capillary or tubing,

some slack must be provided.

●Do not allow the capillary or tubing to

rub against metal surfaces where

friction can cause damage.

●When using a control with

1/4 in. / 6.4 mm tubing, a pulsation

damper must be used. Pulsation can

cause excessive wear and damage

the control.

1. Purge all tubing and lines before connecting the

pressure control.

2. Connect the oil pressure line pump discharge to

the pressure connector labeled “OIL.”

3. Connect the crankcase pressure line to the

pressure connector labeled “LOW.”

4. Coil and secure excess capillary or tubing to

avoid vibration.

Wiring

WARNING: Shock hazard. Disconnect

all power supplies before

making wiring connections to

avoid electrical shock or

damage to the equipment.

●Make all wiring connections using copper

conductors only.

●Wire in accordance with National Electric Code

and local regulations. For maximum electrical

rating of the control, see the label inside the

control cover.

●Use the terminal screws furnished (8-32 x 1/4 in.

binder head). Substitution of other screws may

cause faulty connections.

See Figures 3 through 10 for typical wiring diagrams

or refer to the compressor manufacturer’s

specifications.

4 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin

When the P28 or P128 control is supplied with a

Terminal 3, it may be wired to operate a runlight for

indicating when there is sufficient net oil pressure.

When the control is supplied with a Terminal A, it

can be wired to operate a shutdown alarm or signal

for indicating when the compressor has tripped.

For applications using a 208V control circuit, it is

suggested that one leg of the 208V circuit and a

neutral or ground wire be used as a 120V source to

power the time delay relay.

When a P28 or P128 is installed on a 440 or 550

VAC system, use an external step-down transformer

to provide either 120 or 240V to the pilot and time

delay relay circuits. The transformer must be of

sufficient volt ampere capacity to operate the motor

starter and the time delay relay. Table 1 presents

the power requirements for the P28 or P128 time

delay relay. Table 2 presents the electrical ratings.

Table 1: Electrical Power Required for

Time Delay Relay

Voltage

Timing in

Seconds

12, 24, or 120V 240V

30, 45, 60, 90, or 120 15 VA 30 VA

Table 2: Electrical Ratings--Pilot Duty

Time Delay Relay

Circuit

Pilot Circuit Alarm Circuit* Crankcase Heater**

(Terminal 1)

Runlight**

(Terminal 3)

120/240 VAC 750 VA, 120/240 VAC 10W Tungsten, 120/240 VAC 10 Ampere, 120 VAC

5 Ampere, 240 VAC

10W Tungsten

24 VAC/VDC

12 VAC/VDC

125 VA, 24 VAC

57.5 VA, 24 VDC

125 VA, 24 VAC

57.5 VA, 24 VDC

-- 10W Tungsten

* Must be the same voltage as the pilot circuit.

** Must be the same voltage as the time delay relay circuit.

Pressure actuated contacts. Open on increase in pressure difference between oil and low pressure conntectors. Makes

and breaks time delay heater circuit.

Contacts close simultaneously when PC contacts open (runlight circuit).

Time delay relay. Contacts open after time delay interval if pressure dfference between oil and low pressure connectors

is not established or maintained.

DR -- Voltage dropping resistor used in dual voltage models.

H-Heater for time delay relay.

Connect Terminals L and M as a single pole switch.

Connect Terminals 2 and 240 or 120 to energize circuit only when motor starter is closed.

Contacts close simultaneously when TD contacts open (alarm circuit).

Low Voltage Models

*12 volt also available.

120/240 Models Low

Oil

24*

Low

Oil

120

240

Figure 3: P28 or P128 Internal Wiring Circuit, Showing Alarm Circuit and Runlight Terminals

P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 5

*Crankcase heater cannot be cycled with this hookup. See Figure 5.

Additional controls in this line only.

P28 or P128

240V 3-phase

Operating

Control

Motor

Crankcase

Heater

When Used*

240

120

Figure 4: P28 or P128 Used on a 240V System with

240V Magnetic Starter Coil

*When crankcase heater is used, disconnect jumper from 2 to M

and reconnect from 2 to L.

Additional controls in this line only. 240V 3-phase

Operating

Control

Runlight

if Used

Alarm

if Used

P28 or P128

Motor

240

120

Crankcase

Heater

When Used*

Figure 5: P28 or P128 Wired for 3-wire Control

(Jumper between 2 and M [or L] must be field

installed.)

*When crankcase heater is used, disconnect jumper from 2 to M

and reconnect from 2 to L.

P28 or P128

Additional controls

in this line only.

Alarm

if Used

Crankcase

Heater

When Used*

Ground

120 or 240V

Supply

Hot

Runlight

if Used

120

240

240 or

120V

Motor

Any Voltage

Operating

Control

Figure 6: P28 or P128 Where Separate Supply is

Provided for Control Circuit (Jumper between

2 and M [or L] must be field installed.)

*When crankcase heater is used, disconnect jumper 2 to M

and reconnect 2 to L. Also, make sure that control circuit

transformer has sufficient output for additional load.

240V 440V

440V

3-phase

Crankcase

Heater

When Used*

Runlight

if Used

Alarm

if Used Motor

Additional controls

in this line only.

Operating

Control

P28 or P128

240

120

Figure 7: P28 or P128 Wired for 440V Supply

and 240V Magnetic Start Coil (Also for 550V

Using Proper Transformer) (Jumper between

2 and M [or L] must be field installed.)

6 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin

*When crankcase heater is used, disconnect jumper from 2 to M

and reconnect 2 to L.

240V

3-phase

Crankcase

Heater

When Used*

Runlight

if Used

Alarm

if Used

Additional controls

in this line only.

Start

Stop

Motor

P28 or P128

240

120

Figure 8: P28 or P128 Where Manual “Start-Stop”

Pushbutton Station is Used (Jumper between

2 and M [or L] must be field installed.)

*12 volt also available.

Transformer 240V

3-phase

Starter Coil

Operating

Control

Motor

Additional controls

in this line only.

P28 or P128

Alarm

if Used

24*

Figure 9: P28 or P128 Where 24V Control Circuit

Power is from a Step-down Transformer (Jumper

between 2 and M must be field installed.)

Note: This system would provide shutdown on low

lube oil pressure in either of two compressors

operated by the common motor.

Oil

Low

Oil

Low

P74AA P28/P128

Compressor

Motor

Junction Box

240

Operating

Control 240 V

Figure 10: P28 or P128 and P74AA Wired for an

Oil Pressure Control System Where One Motor

Operates Two Compressors

Adjustments

The P28 and P128 controls are shipped with a cut-out

pressure differential of 9 psi (62 kPa). However, the

controls can be adjusted according to the compressor

manufacturer’s specifications.

Note: When the controls are shipped as an

accessory to the compressor unit, time delay

and cut-out pressure are set to manufacturer’s

specifications. Replacement controls should

duplicate the manufacturer’s specifications.

CAUTION: Equipment damage hazard.

To avoid damage to the

compressor, obtain the

compressor manufacturer’s net

oil bearing pressure

specifications as soon as

possible. If necessary, reset the

cut-out pressure difference to the

manufacturer’s specifications.

When the manufacturer’s specifications are not

known, proceed as follows to set the cut-out pressure

differential:

1. With the compressor running, read the oil

pressure and the crankcase pressure.

2. Subtract the crankcase pressure reading from the

oil pressure pump discharge reading. This is the

net oil pressure to the bearings.

3. Set the cut-out pointer 6 to 8 psi (41 to 55 kPa)

below the established running net oil pressure with

the Adjusting Disk using a standard screwdriver.

P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin 7

To increase the cut-out pressure, turn the

Adjusting Disk counterclockwise. To decrease,

turn clockwise.

To raise the pressure differential, turn the

Adjusting Disk (see Figure 2) to the left when

viewing the front of the control. Turn the adjusting

disk to the right to lower the pressure differential.

Test for Shutdown

Immediately after installing, and at regular intervals

thereafter, the time delay relay should be tested to

verify that all circuits are operating correctly.

WARNING: Shock hazard. Disconnect

power from the control before

testing for shutdown to avoid

electrical shock or damage to

the equipment.

To test for shutdown:

1. Remove power from the control and remove the

control cover.

2. Connect a jumper between Terminals 1 and 2.

See Figure 3 for terminal locations.

Note: If the control is mounted on a condensing

unit where air from auxiliary equipment

(blowers or fans) may strike the control,

the control cover should be replaced

before proceeding to Step 3.

3. Apply power to start the compressor. The time

delay relay should trip after the time interval and

stop the compressor.

4. Remove power from the control and remove the

jumper between Terminals 1 and 2.

5. Replace the cover on the control and apply power.

6. Manually reset the time delay relay if required.

Checkout Procedure

Before leaving the installation, observe at least

three complete operating cycles to be sure that all

components are functioning correctly.

Fungus Proofing

Fungus proofing can be supplied at extra cost when

specified. Conforms to government specifications

MIL-V-173A.

Repairs and Replacement

Field repairs must not be made, except for

replacement of the time delay relay assembly. For a

replacement control or time delay relay assembly,

contact the nearest Johnson Controls representative

or Refrigeration Application Engineering at 414-274-

5535.

Table 3: Replacement Time Delay Relay Assemblies

Part Number Voltage Reset Type Timing in Seconds Alarm Circuit

RLY13A-600R 120/240 VAC Manual 60 No

RLY13A-602R 120/240 VAC Manual 90 No

RLY13A-603R 120/240 VAC Manual 90 Yes

RLY13A-608R 120/240 VAC Automatic 90 No

RLY13A-609R 24 VAC/VDC Manual 120 No

RLY13A-610R 120/240 VAC Manual 30 No

RLY13A-616R 120/240 VAC Manual 120 No

RLY13A-617R 120/240 VAC Manual 45 No

8 P—P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay Product/Technical Bulletin

Ordering Information

Table 4: Ordering Information

Series Part

Number

Pressure

Connections*

Reset Type Refrigerant Time Delay

Relay Voltage

Alarm

Terminal

Runlight

Terminal

P28AA Style 13, Style 5,

or Style 15

Manual Non-corrosive

All-range

120/240 VAC No No

P128AA Style 5 Manual Non-corrosive

All-range

120/240 VAC No No

P28AN Style 15 Manual Ammonia 120/240 VAC No No

P28DA Style 13 Manual Non-corrosive

All-range

120/240 VAC Yes Yes

P28DN Style 15 Manual Ammonia 120/240 VAC Yes Yes

P28GA Style 13 Automatic Non-corrosive

All-range

120/240 VAC No No

P28NA Style 13 or Style 5 Manual Non-corrosive

All-range

24 VAC/VDC No No

P28PA Style 5 Manual Non-corrosive

All-range

24 VAC/VDC No No

* Style 5 connections are 1/4 in. / 6.4 mm SAE male flare connectors (no capillary tubing). Style 13 connections are 36 in. / 914 mm

capillary tubing and 1/4 in. / 6.4 mm flare nut. Style 15 connections are 1/4 in. / 6.4 mm female National Pipe Thread connectors.

Specifications

Product P28 and P128 Series Lube Oil Controls with Built-in Time Delay Relay

Power Requirements See Tables 1 and 2.

Pressure Specifications Adjustable Cut-out Pressure Difference: 8 to 70 psi (55 to 483 kPa)*

Maximum Differential: 70 psi (483 kPa)

Maximum Working Pressure: 250 psig (1724 kPa) on the high side

Maximum Overpressure: 325 psi (2240 kPa) oil and low side pressure

*The time delay relay is de-energized 3 to 5 psi (21 to 34 kPa) above the cut-out scale setting.

Pressure Switch Units Enclosed Dust-protected Pennswitch

Ambient Operating Conditions 32 to 104°F / 0 to 40°C

Material Case: 0.062 in. / 1.6 mm Galvanized Steel

Cover: 0.028 in. / 0.7 mm Cold Rolled Steel (plated and painted)

Mounting Flat Surface or with a Universal Mounting Bracket (Part No. 271-51)

Wiring Terminal Large 8-32 x 1/4 in. Binder Head Screws

Agency Listings UL Guide No. SDFY; File SA516**

CSA Class No. 1222 01; File LR948**

**Most models. Contact Johnson Controls for a complete listing.

Dimensions (H x W x D) 5.66 x 5.32 x 2.09 in. / 144 x 135 x 53 mm

Shipping Weight 3.0 lb / 1.36 kg

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications,

consult the local Johnson Controls Refrigeration Application Engineering at (414) 274-5535. Johnson Controls, Inc. shall not be liable for damages

resulting from misapplication or misuse of its products.

Controls Group FAN 125

507 E. Michigan Street Master Catalog

P.O. Box 423

Milwaukee, WI 53201

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