Johnson Controls PENN P70 Series User manual

Installation Instructions

Issue Date June 12, 2006

P70, P72, and P170 Series Controls for

Low Pressure Applications

Application

P70, P72, and P170 Series Controls for Low Pressure

Applications provide low-side pressure control on

commercial refrigeration and air-conditioning

applications.

IMPORTANT: Use the P70, P72, and P170

Series Controls for Low Pressure Applications only

as an operating control. Where failure or malfunction

of a P70, P72, or P170 pressure control could lead

to personal injury or property damage to the

controlled equipment or other property, additional

precautions must be designed into the control

system. Incorporate and maintain other devices such

as supervisory or alarm systems or safety or limit

controls intended to warn of, or protect against,

failure or malfunction of the P70, P72, or P170

pressure control.

Part No. 24-7664-1601, Rev. C www.johnsoncontrols.com

P70A and P170A type models with Single-Pole

Single-Throw (SPST) Open-Low switch action are the

most popular models and are typically used for

Open-Low operation and pump-down control.

P70 and P170 Series control models are also

available with SPST Open-High switch action and are

typically used for capacity control. 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 Series control models have a Double-Pole

Single-Throw (DPST) switch with load-carrying

contacts that provide direct control of 208-240 VAC

single-phase motors up to 3 hp, 480 VAC

single-phase, non-compressor motors, and 208-220

VAC 3-phase motors up to 5 hp. See Table 6.

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. See

Table 2.

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.

The Manual Reset Lockout mechanism does not

allow the control to automatically reset after the control

has Cutout, providing shutdown capability for

unmonitored equipment. See Manual Reset Operation.

NEMA 1 enclosures are standard on most models.

NEMA 3R enclosures are available on select models.

CAUTION: Risk of Property Damage.

Mount the pressure control separately from the

electrical cabinet and seal all electrical piping to

prevent ammonia from migrating to electrical

components. Where there may be exposure to

ammonia, use only ammonia compatible control

modules and pressure connections. System

shutdown due to improper adjustment may cause

property damage.

Dimensions

MountingHole

3/16

5Diameter

2-Mounting Holes

10-32 UNF-2B

Thread

101

3-1/16

1-5/16

1/16

15/16

2-1/16

53 1-1/4

3/16

7/8

22 Conduit Hole

5/16

3-1/4

83 5/16

1-1/8

1-7/8

5/16

3/8

10 X3/16

Diameter

Mounting Hole

(NEMA 1/2 in.)

3-1/4

13/16

2-13/16

1-11/16

1-3/4

Figure 1: Dimensions of P70, P72, and P170

Pressure Controls with NEMA 1 Enclosures,

in. (mm)

4-1/16

104

4-1/16

104

5/8

2-11/16

3/8

1-1/4

31 1-5/8

7/16

1-9/16

401/2

3/4-NPSM

Rigid Conduit

Hole

2-15/16

3/16

1/2

4 Mounting Holes

5/16

8Diameter

Figure 2: Dimensions of P70, P72, and P170

Pressure Controls with NEMA 3R Enclosures,

in. (mm)

Note: These dimensions are nominal and are

subject to accepted manufacturing tolerances and

application variables.

Mounting

Mount the control in an accessible position, where the

control and pressure-connection line are not subject to

damage.

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 or control

bellows, which could cause control malfunction.

Controls with NEMA 1 enclosures may be mounted on

horizontal or vertical flat 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 with screws supplied when mounting the

control to a flat horizontal surface. See Figure 3.

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.

IMPORTANT: Use only the mounting screws

supplied with the Universal Mounting Bracket to

avoid damaging internal components. Be careful not

to distort or bend the control case when mounting

the control to an uneven surface. Using other screws

or bending the control case will void the warranty.

Use mounting screws

provided. Longer screws

may damage control.

Mounting Holes fo

Flat Vertical Surfaces

Universal Mounting

Bracket

(Part Number 271-51)

Mount bracket to

horizontal surface.

Figure 3: Mounting the P70, P72, and P170 Low

Pressure Controls with NEMA 1 Enclosures

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.

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, you

must comply with all standards and regulations

governing the containment and handling 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 2 to 3 in. [50 to 75 mm]

diameter). Securely fasten the coiled tubing.

2 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions

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 pneumatic and pressure-connection lines

to remove air, moisture, and other contaminants in a

manner consistent with applicable environmental

regulations and standards.

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. Also see Electrical Ratings.

Check the wiring terminal designations on the control

switch-block, and refer to the following guidelines and

applicable wiring diagram when wiring the control.

WARNING: Risk of Electric Shock.

Disconnect each of the multiple power supplies

before making electrical connections. More than one

disconnect may be required to completely

de-energize equipment. Contact with components

carrying hazardous voltage can cause electric shock

and may result in severe personal injury or death.

IMPORTANT: Use copper conductors only.

Make all wiring connections in accordance with local,

national, and regional regulations. Do not exceed the

control’s electrical ratings.

IMPORTANT: Use only the terminal screws

that are supplied with the switch-block. Using other

screws may cause damage to the switch-block and

will void the warranty.

Load

Line

Open-High switch action:

opens on pressure rise.

(C and D Models)

Load

Line M1

Open-Low switch action:

opens on pressure drop.

(A and B Models)

Figure 4: Typical Wiring for SPST Open-Low

Switch and Open-High Switch

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

Load

Alarm

1 to 3 opens, and 1 to 2 closes

on pressure rise.

Figure 5: Typical Wiring for SPDT Switch

(P70E and F Type Models)

Line

Load

Line M2

Alarm

Circuit

Power

Alarm

Main circuit (Line to M2) opens and

auxiliary circuit (Line to M1) closes

on pressure rise.

Figure 6: Typical Wiring for 4-Wire, 2-Circuit

Switch (P70G and H Type Models)

Line M1

Load

Line M2

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

L3*

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

Figure 7: Typical Wiring for DPST Switch

(P72A and B Type Models)

P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions 3

Table 1: Single Pressure Controls Switch Action, Low Events, High Events, Model Types, and Electrical

Rating Table References

Switch and Action Low Event High Event Model Types - Electrical

Rating Table Reference

Single-Pole Single-Throw

(SPST) Open-Low Cutout

(Opens Line to M1) Cut In

(Closes Line to M1) P70A, P70B, P170A

See Table 3.

SPST Open-High Cut In

(Closes Line to M1) Cutout

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

See Table 3.

Single-Pole Double-Throw

(SPDT) Opens 1 to 2 and

Closes 1 to 3 Closes 1 to 2 and

Opens 1 to 3 P70E

See Table 4.

4-Wire, 2-Circuits,

1 N.O., 1 N.C.

Open-Low

Cutout

(Opens M2 to Line and

Closes M1 to Line)

Cut In

(Closes M2 to Line and

Opens M1 to Line)

P70G, P70H

See Table 5.

4-Wire, 2-Circuits,

1 N.O., 1 N.C.

Open-High

Cut In

(Closes M2 to Line and

Opens M1 to Line)

Cutout

(Opens M2 to Line and

Closes M1 to Line)

P70J, P70K, P170K

See Table 5.

Double-Pole Single-Throw

(DPST)

Open-Low

Cutout

(Opens M1 to Line and

M2 to Line)

Cut In

(Closes M1 to Line and

M2 to Line)

P72A, P72B

See Table 6.

DPST

Open-High Cut In

(Closes M1 to Line and

M2 to Line)

Cutout

(Opens M1 to Line and

M2 to Line)

P72C, P72D

See Table 6.

Adjustments

Adjustment of the P70, P72, and P170 low pressure

controls varies, 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 an All-Range or MICRO-SET

model. See Table 1 for switch action, low event, and

high event of the various control models. See Figure 8

for an illustration and instructions on control

adjustments.

Adjusting All-Range Controls

All-Range pressure controls have scaleplates that

display the Cut In and Cutout setpoints. (See the

visible scale on the control.) Turn the range screw to

adjust the Cut In and Cutout setpoints up or down

simultaneously while maintaining a constant pressure

differential. Turn the differential screw to adjust (only)

the low event on the left side of the scale (which

changes the differential pressure value).

Adjusting MICRO-SET Controls

MICRO-SET low-side pressure controls have

scaleplates that display the Cut In setpoint and

Differential setting. (See visible scale on control.) Turn

the range screw to adjust the Cut In setpoint on the

right side of the scale. Turn the differential screw to

adjust the differential setting on the left side (which

changes the Cutout pressure value).

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, may cause

inaccurate control operation, and will void the

warranty.

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 mounting and wiring

control, attach a reliable set of gauges to the

controlled equipment, and operate the equipment (at

least) three cycles at the pressures necessary to

verify control setpoints and proper equipment

operation.

4 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions

Figure 8: Adjusting P70, P72, and P170 Controls for Low Pressure Applications

Limited Knob Adjustment

Some models are supplied with a Limited Knob

Adjustment Kit which limits adjustments to the

pressure control and helps 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 9, 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.

Adjustment Knob withSet Screw

Indicator Plate

Spacer*

Installation of Knob Kit to

Lock Differential Screw and

Allow LimitedAdjustment of

Range Screw

Installation of Knob Kit to

Lock Range Screw, and

Allow Limited Adjustment of

Differential Screw

Range Screw

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

screw as knob.

OnAll-Range controls, always place spacer on rangescrew.

Figure 9: Installing Limited Knob Adjustment Kit

P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions 5

Manual Reset Operation

Pressure controls with the Manual Reset option lock

out when they reach Cutout pressure and must be

manually reset by the user to restart the controlled

equipment. The manual reset mechanism is trip-free

and cannot be overridden by blocking or tying the

reset button down.

n 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.

Table 2: Standard P70, P72 and P170 Control Models for Low Pressure Applications

Model

Number Switch Action Range

in. Hg to psig

(kPa)

Differential

psi (kPa) Pressure

Connection Maximum

Working

Pressure (MWP)

psig (kPa)

MICRO-SET Control Models (For Noncorrosive Refrigerants)

P70AB-12 36 in. Cap. with

1/4 in. Flare Nut

P170AB-12

SPST

Open-Low 12 in. Hg to

80 psig

(-41 to 551 kPa)

Minimum 5 (34)

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

Connector

325

(2241)

All-Range Control Models (For Noncorrosive Refrigerants)

P70AB-1 1/4 in. Male Flare

Connector

P70AB-2

SPST

Open-Low 36 in. Cap. with

1/4 in. Flare Nut

P70CA-1 SPST

Open-High

Minimum 7 (48)

Maximum 50 (345)

36 in. Cap. with

1/4 in. Flare Nut

P70EA-10 SPDT

1 to 3 Open-Low

1 to 2 Close-Low

5 (34)

Fixed 1/4 in. Male Flare

Connector

P72AA-1

P72AB-1

DPST

Open-Low 36 in. Cap. with

1/4 in. Flare Nut

P170AB-2 SPST

Open-Low

P170CA-1 SPST

Open-High

20 in. Hg to

100 psig

(-68 to 690 kPa)

Minimum 7 (48)

Maximum 50 (345)

1/4 in. Male Flare

Connector

325

(2241)

All-Range Control Models (Ammonia Compatible)

P70AA-5 SPST

Open-Low

P70CA-4 SPST

Open-High

20 in. Hg to

100 psig

(-68 to 690 kPa)

Minimum 7 (48)

Maximum 50 (345) 1/4 in. SS Female

NPT 325

(2241)

Low Pressure Control Models for High Pressure Non-Corrosive Refrigerants

Model

Number Switch Action Range psi

(kPa) Differential psi

(kPa) Pressure

Connection Maximum

Working

Pressure (MWP)

psig (kPa)

P70AA-2 36 in. Capillary with

1/4 in. Flare Nut

P170AA-2

SPST

Opens-Low 0 to 150 psig

(0 to 1034 kPa) Adjustable

10 to 70

(69 to 483) 1/4 in. Male Flare

Connector

325

(2241)

6 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions

Electrical Ratings

Table 3: SPST Electrical Ratings (P70A, B, C, D, and P170A, B, C, D Type Models)

Standard Single-Phase Ratings Hermetic Compressor

Single-Phase Ratings

120 VAC 208 VAC 240 VAC *480 VAC *600 VAC 208/240 VAC

Motor Full-Load Amperes 24 18.7 17 5 4.8 24

Motor Locked-Rotor Amperes 144 112.2 102 30 28.8 144

Non-Inductive Amperes 22 22 22 -- -- --

Pilot Duty 125 VA at 120 to 600 VAC; 57.5 VA at 120 to 300 VDC

* Not for compressor motor loads

Table 4: SPDT Electrical Ratings Standard Differential Switch (P70E Type Models)

Standard Single-Phase Ratings

120 VAC 208 VAC 240 VAC 277 VAC*

Motor Full Load Amperes 16.0 9.2 8.0 7.0

Motor Locked Rotor

Amperes 96.0 55.2 48.0 42.0

Non-Inductive Amperes 16.0 16.0 16.0 16.0

Pilot Duty 125 VA at 120 to 600 VAC 125 VA at 24 to 600 VAC

* Rating for P70EC models only

Table 5: 4-Wire, 2-Circuit Electrical Ratings (P70G, H, J, K, and P170K Type Models)

Standard Single-Phase Ratings

Line-M2 (Main Contacts) Line-M1 (Auxiliary Contacts)

120

VAC 208

VAC 240

VAC 277

VAC *480

VAC *600

VAC 120

VAC 208

VAC 240

VAC 277

VAC

Motor Full Load

Amperes 16.0 9.2 8.0 -- 5 4.8 6.0 3.3 3.0 --

Motor Locked Rotor

Amperes 96.0 55.2 48.0 -- 30 28.8 36.0 19.8 18.0 --

Non-Inductive

Amperes 16.0 9.2 8.0 7.2 -- -- 6.0 6.0 6.0 6.0

Pilot Duty (for both

sets of contacts) 125 VA at 24 to 600 VAC; 57.5 VA at 120 to 300 VDC

* Not for compressor motor loads

P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions 7

Table 6: DPST Electrical Ratings (P72A, B, C, and D Type Models)

Standard Ratings Hermetic

Compressor

Ratings

120

VAC

1Ø

208

VAC

1Ø

240

VAC

1Ø

208

VAC

3Ø

220

VAC

3Ø

*480

VAC

1Ø

*600

VAC

1Ø

208

VAC

1Ø

240

VAC

1Ø

Motor Full-Load Amperes 24 18.7 17 15.9 15 5 4.8 24 24

Motor Locked-Rotor Amperes 144 112.2 102 95.4 90 30 28.8 144 144

AC Non-Inductive Amperes 24 24 24 24 24 -- -- -- --

DC Non-Inductive Amperes 3 0.5 0.5 0.5 0.5 -- -- -- --

Pilot Duty 125 VA at 120 to 600 VAC; 57.5 VA at 120 to 300 VDC

* Not for compressor motor loads

Technical Specifications

Product P70, P72 and P170 Series Controls for Low Pressure Applications

Switch Action P70, P170: SPST; 4-wire/2-circuit; or SPDT PENN®switch P72: DPST

Pressure Connection P70, P72 Standard Models

various connections

available.

P170 Standard Models

1/4 in. SAE male flare Ammonia Compatible Models

1/4 in. stainless steel female

NPT connection

Ambient Temperature P70E and P70F Type Models: 50 to 104°F (10 to 40°C)

All Other Models: -40 to 140°F (-40 to 60°C)

Case and Cover NEMA 1 Enclosures: Case is galvanized steel; cover is plated and painted steel.

NEMA 3R Enclosures: Case and cover are plated and painted steel.

Dimensions (H x W x D) NEMA 1 Enclosure: 3-1/4 x 4 x 2-1/16 in. (83 x 101 x 53 mm)

NEMA 3R Enclosure: 4-1/16 x 4-1/16 x 2-15/16 in. (104 x 104 x 74 mm)

Approximate Shipping

Weight Individual Pack: (NEMA 1 Enclosure) 2.4 lb (1.08 kg);

Bulk Pack: (NEMA 1 Enclosure in multiples of 25 controls) 60 lb (27.2 kg)

Compliance For information on specific models, contact Refrigeration Application Engineering

at 1-800-275-5676.

Accessories 271-51 Universal Mounting Bracket (supplied with standard controls)

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

specifications, contact Refrigeration Application Engineering at 1-800-275-5676. Johnson Controls, Inc. shall not be liable for damages

resulting from misapplication or misuse of its products.

Controls Group

507 E. Michigan Street

P.O. Box 423 Published in U.S.A.

Milwaukee, WI 53201 www.johnsoncontrols.com

8 P70, P72, and P170 Series Controls for Low Pressure Applications Installation Instructions

Controles para Aplicaciones de Baja Presión

Series P70, P72, y P170

Aplicación

Los Controles para Aplicaciones de Baja Presión de las

Series P70, P72, y P170 proporcionan control de presión

del lado bajo en aplicaciones de refrigeración comercial y

de aire acondicionado.

IMPORTANTE: El propósito de los Controles para

Aplicaciones de Baja Presión de las Series P70, P72, y

P170 es de controlar equipo bajo condiciones normales de

operación. Donde un mal funcionamiento o falla de un

control de presión P70, P72, o P170 pueda resultar en una

condición anormal de operación, que a su vez pueda

causar lesión personal o daño al equipo u otra propiedad,

se deben instalar otros aparatos (controles de límite o de

seguridad) o sistemas (de alarma o supervisión) para

advertir o protegir contra éstas fallas o mal funcionamiento

del control de presión P70, P72, o P170, y mantenerse

como parte del sistema de control.

Modelos de Tipo P70A y P170A con interruptor de Un

Polo – Un Tiro (SPST) con acción Abre al bajar son los

modelos más populares y se usan típicamente para una

operación de Abre en baja y control de evacuación.

También los modelos de la Serie P70 y P170 están

disponibles con interruptor SPST con acción Abre al subir

se usan típicamente para controlar capacidad. Los

modelos de control con interruptor de Un Polo-Dos Tiros

(SPDT) o 4 alambres – 2 circuitos permiten que los

usuarios instalen aparatos de alarma u otros circuitos de

control.

Los modelos de la Serie P72 tienen un interruptor de

Dos Polos-Un Tiro (DPST) con contactos para llevar la

carga que proporcionan control directo a motores

monofásicos de 208-240 VCA hasta 3 HP, motores

monofásicos de 480 VCA no de compresor y motores

trifásicos de 208-220 VCA hasta 5 HP. Refiérese a la

Tabla 6.

Estos controles están disponibles en varios rangos de

presión y son compatibles con los refrigerantes más

comúnes. También se usan en aplicaciones de aire, agua,

y otros líquidos no corrosivos. También tenemos modelos

compatibles con amoníaco. Ver la Tabla 2.

La opción MICRO-SET® provee un ajuste refinado del

diferencial para un control preciso de la presión en

aplicaciones criticas de baja presión.

Algunos modelos están disponibles con Ajuste de Perilla

Limitado, que restringe ajuste de la presión y evita un

ajuste excesivo o el manejo inexperto. Vease Ajuste de

Perilla Limitado.

El mecanismo de Bloqueo de Restablecimiento Manual

no permite que el control se restablezaca

automáticamente después de llegar al punto de

Desconexión, y proporciona la capacidad de apagado para

equipo no monitoreado. Ver Ajuste de Operación de

Restablecimiento Manual.

Las cajas NEMA 1 son estándar en la mayoría de los

modelos.

Las cajas NEMA 3R están disponibles en ciertos modelos.

PRECAUCION: Riesgo de Daño al Equipo.

El amoníaco es muy corrosivo a componentes de cobre

y latón. En aplicaciones de amoníaco se deben usar

sólo modelos de control y conexiones de presión

compatibles con amoníaco. El control de presión se

debe instalar separadamente del gabinete eléctrico y se

deben sellar todos los conductos eléctricos para evitar

que el amoníaco se filtre a los componentes eléctricos.

Dimensiones

3/16

101

3-1/16

1-5/16

1/16

15/16

2-1/16

53 1-1/4

3/16

7/8

5/16

3-1/4

83 5/16

1-1/8

1-7/8

5/16

3/8

10 X3/16

3-1/4

13/16

2-13/16

1-11/16

1-3/4

2 Orificios de Montaje

10/32 UNF/2B

Hilos

Diametro del

Orificio de Montaje

Diametro del

Orificio de

Montaje

con rosca 10/32 UNF/2B

Orificio conduit

Figura 1: Dimensiones de los Controles de Presión

P70, P72, y P170 con Cajas NEMA 1, pulg. (mm)

Instrucciones de Instalación de los Controles de Serie 70, P72, y P170 para Aplicaciones de Baja Presión 9

12 Instrucciones de Instalación de los Controles de Series P70, P72, y P170 para Aplicaciones de Baja Presión

4-1/16

104

4-1/16

104

5/8

2-11/16

3/8

1-1/4

31 1-5/8

7/16

1-9/16

401/2

3/4-NPSM

Orificio del Conducto

Rígido

2-15/16

3/16

1/2

4 Orificios de Montaje

5/16

Diametro

Conduit

Figura 2: Dimensiones de los Controles de Presión

P70, P72, y P170 con Cajas NEMA 3R, pulg. (mm)

Nota: Estas dimensiones son nominales y están sujetas a

las tolerancias de manufactura y variables de la aplicación

aceptadas.

Instalación

Instale el control en una posición accesible, donde el

control y la línea de conexión de presión no estén sujetos

a daños.

Instale el control de presión en una posición vertical y

nivelada. Coloque la línea de conexión de presión de

manera que se pueda drenar lejos del fuelle del control.

Los puntos de entrada de la presión se deben localizar en

el lado superior de la linea del refrigerante. Esto reduce la

posibilidad de que el aceite, líquidos, o sedimento se

acumulen en la conexión de presión o en el fuelle del

control, que podría causar un mal funcionamiento del

control.

Los controles con cajas NEMA 1 pueden que ser

instalados en superficies planas, horizontales o verticales.

Use dos tornillos o pernos a través de los dos orificios

exteriores en el reverso de la caja de control cuando se

instale directamente en una superficie plana y vertical.

Use los dos orificios internos con el soporte de Instalación

Universal, con los tornillos provistos, al instalar el control

en una superficie plana y horizontal. Vea la Figura 3.

Los controles con cajas NEMA 3R están diseñados para

instalarse en una posición nivelada y vertical, con el

elemento sensor y la conexión conduit hacia abajo. Todos

los empaques deben estar en su lugar. La instalación de

las cajas NEMA 3R en cualquier otra posición que no sea

vertical y nivelada puede atrapar agua en la caja y

sumergir los componentes internos del control.

IMPORTANTE: Use sólo el tornillo de instalación

proveído con el soporte de Instalación Universal para

evitar daños a los componentes internos. No tuerza la caja

de control cuando se instale el control en una superficie

vertical irregular.

Utilice los tornillos de

montaje provistos. Los

tornillos mas largos

pueden dañar el control.

Instale el sorporte a la

superficie horizontal.

Orificios de Montaje para

Superficies Planas y Verticales

Figura 3: Instalación de los Controles de Presión

Baja P70, P72 y P170 con Cajas NEMA 1

Conexiones de Presión

Los controles de baja presión P70, P72 y P170 se

conectan al equipo controlado por medio de un capilar o

manguera flexible (excepto los modelos para amoníaco),

disponibles en diferentes estilos de conexión de presión.

Siga estas pautas cuando al instalar las lineas de conexión

de presión:

IMPORTANTE: Si estos controles se instalan en equipo

que contiene materiales peligrosos o regulados, tal como

refrigerantes o lubricantes, el instalador y usuario deben

observar todas las reglamentaciones que gobiernan el

manejo y contención de esos materiales.

Evite Dobleces Agudos en el Tubo Capilar

Los dobleces agudos pueden debilitar los tubos del

capilar, que resultarían en fugas u obstrucciones.

Permita Soltura en el Tubo Capilar

Dejar el tubo capilar un poco flojo puede ayudar a

amortiguar la vibración mecánica que pueda debilitar o

dañar los tubos capilares.

Enrolley Asegure el Exceso del Tubo Capilar

Cuidadosamente enrolle cualquier exceso de tubo capilar en

bobinas lisas y redondas (aproximadamente de 2 a 3 pulg.

[25 a 50 mm] de diámetro). Sujete el capilar enrollado.

Evite el Contacto entre el Tubo Capilar y Objetos

Agudos o Abrasivos

La vibración de los objetos agudos o abrasivos que estén en

contacto con los tubos capilares pueden resultar en fugas.

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