Parker Sporlan LAC-4 Nota de publicación

INSTALLATION INSTRUCTIONS

To ensure proper performance, head

pressure control valves must be selected

and applied correctly. This is covered

thoroughly in Bulletin 90-30. However,

proper installation procedures are equally

important.

Valve Location/Piping Suggestions -

LAC-4 valves can be installed in horizontal

or vertical lines, whichever best suits the

application and permits easy accessibil-

ity of the valves. However, consideration

should be given to locating these valves

so they don’t act as oil traps or that solder

cannot run into the internal parts dur-

ing brazing. Care should also be taken

to install the valves with the flow in the

proper direction.

Figure 3 is a piping schematic only to illus-

trate the general location of the LAC-4

valve. In most cases the valve is located at

the condensing unit. When the condenser

is remote from the compressor, the usual

location is near the compressor. Spor-

lan recommends that recognized piping

references be consulted for assistance in

piping procedures. Sporlan is not respon-

sible for system design, any damage aris-

ing from faulty system design, or for mis-

application of its products. If these valves

are applied in any manner other than as

described in this bulletin, the Sporlan

warranty is void.

Inlet Strainer - The need for an inlet

strainer is a function of system cleanliness.

Inlet strainers are available for the LAC-4

and LAC-4-DS (3/8” ODF fittings must

have a rolled stop to support the strainer).

Keep in mind that the LAC model actu-

ally has two inlet fittings (condenser and

Head Pressure Control Valves

LAC-4 and LAC-4-DS

INSTALLATION AND SERVICING INSTRUCTIONS

SD-134 / 82021

discharge) and it may be desirable to use

an inlet strainer in both fittings.

Brazing Procedures - Any of the com-

monly used brazing alloys for high side

usage are satisfactory. However, when sol-

dering or brazing, it is very important that

the internal parts be protected by wrap-

ping the valve with a wet cloth to keep the

body temperature below 250°F. Also, when

using high temperature solders, the torch

tip should be large enough to avoid pro-

longed heating of the copper connections.

And, always direct the flame away from the

valve body.

Test and Operating Pressures - Inert

dry gases such as nitrogen, CO2or helium

are often used for leak detection. Excessive

leak testing or operating pressures may

damage these valves or reduce the life of

the diaphragm or bellows.

CAUTION: Inert gases must be added

to the system carefully through a

pressure regulator. Unregulated gas

pressure can seriously damage the

system and endanger human life.

Never use oxygen or explosive gases.

The maximum pressure that this valve

can withstand without damage is 500 psig.

Care must be taken to keep test or operat-

ing pressures below this maximum rated

pressure.

Table 1

FITTING SIZE INLET STRAINER

PART NUMBER

3/8” 825-003

1/2” 825-004

RECEIVER

DISCHARGE

RECEIVER

CONDENSER

Page 2 / SD-134

VALVE SETTINGS

LAC-4

The LAC-4 is available with 4 standard set-

tings for various refrigerants as shown in

Table 2. Some manufacturers’ systems use

other settings which are critical to system

operation e.g. harvest cycle on ice makers.

These non-standard settings are available

for replacement but delivery time may be

extended. See Figure 1.

LAC-4-DS

The LAC-4-DS provides the choice of two

settings, 100 psig or 180 psig (other com-

binations of high and low settings have

been produced). The higher setting is ob-

tained by a combination spring force and

air charge in the upper dome assembly.

See Figure 2. The valve supplied with the

higher of the two settings is stamped on

the hex flats of the condenser connection.

When the valve is used on systems with:

Refrigerant 407A, 407F, 448A, 449A,

and 502

1. Remove low setting stamp from hex flat

with a file.

2. Install valve. It is set to maintain 180

psig during low ambient conditions.

Refrigerant 134a and 513A

1. Clip 3/4” off dome capillary tube to

relieve air charge.

2. Remove paint from end of

capillary tube.

3. Fuse tip to prevent moisture from

entering dome.

4. Remove high setting stamp from hex

flat with a file.

5. Install valve. It is now set to maintain

100 psig during low ambient

conditions.

CONDENSER

LAC - 4

Figure 1

LAC - 4 - DS

Figure 2

WARNING: Serious injury could result from an explosion caused by the rapid expansion

of trapped liquid refrigerant subjected to high temperature. Always open or vent the sys-

tem before applying heat to remove system components. Break the element charging

cap tube on valve dome by hand or with a clean cut tool. Do not use side cutters which may

seal the opening.

SERVICE INSTRUCTIONS

There are several possible causes for system malfunction with “refrigerant side” head

pressure control and these may be difficult to isolate from each other. As with any form

of system trouble-shooting, it is necessary to know the existing operating temperatures

and pressures before system problems can be determined. Once the actual malfunction

is established, it is easier to pinpoint the cause and then take suitable corrective action.

The following chart lists the most common malfunctions, the possible causes, and the

remedies.

Figure 3

The LAC-4 Liquid Flow capacities are equal to the above hot gas flow capacities (at 5 psi ∆P) at less than

two psi pressure drop.

Table 2

REFRIGERANT RECOMMENDED SETTINGS (PSI)

12, 134a, 513A 100

401A 120

22, 502, 407A, 407F, 448A, 449A 180

404A, 507, 402A 210

Table 3

LOW AMBIENT (Winter) CAPACITIES - TONS

Capacities are based on 0°F Evaporator, 94°F Condenser, 10°F Subcooled Liquid;

Valve Setting of 100 psig for R-134a / 513A;

180 psig for 407A / 407F / 448A / 449A; 210 psig for 404A / 507

PRESSURE

DROP ACROSS

VALVE

(PSI)

REFRIGERANT

134a / 513A 448A / 449A 407A / 407F 404A / 507

MINIMUM AMBIENT DESIGN TEMPERATURE °F

-20 0 20 -20 0 20 -20 0 20 -20 0 20

5 2.9 3.1 3.5 3.4 3.6 3.9 3.7 4.0 4.3 2.5 2.6 2.9

10 4.0 4.3 4.8 4.7 5.0 5.5 5.2 5.6 6.1 3.5 3.7 4.0

20 5.4 5.9 6.6 6.5 7.0 7.6 7.2 7.7 8.4 4.8 5.1 4.9

SD-134 / Page 3

COMPRESSOR RECEIVER

CONDENSER

LAC

FOR USE ON REFRIGERATION and/or AIR CONDITIONING SYSTEMS ONLY

⚠WARNING – USER RESPONSIBILITY

Failure or improper selection or improper use of the products described herein or related items can

cause death, personal injury and property damage.

• This document and other information from Parker-Hannifin Corporation, its subsidiaries and authorized distributors provide

product or system options for further investigation by users having technical expertise.

• The user, through its own analysis and testing, is solely responsible for making the final selection of the system and

components and assuring that all performance, endurance, maintenance, safety and warning requirements of the

application are met. The user must analyze all aspects of the application, follow applicable industry standards, and follow

the information concerning the product in the current product catalog and in any other materials provided from Parker or

its subsidiaries or authorized distributors.

• To the extent that Parker or its subsidiaries or authorized distributors provide component or system options based upon

data or specifications provided by the user, the user is responsible for determining that such data and specifications are

suitable and sufficient for all applications and reasonably foreseeable uses of the components or systems.

SD-134 / 82021

Parker Hannin Corporation

Sporlan Division

206 Lange Drive • Washington, MO 63090 USA

phone 636 239 1111 • fax 636 239 9130

www.sporlan.com

MALFUNCTION - LOW HEAD PRESSURE

POSSIBLE CAUSE REMEDY

1. Insufficient refrigerant charge to

adequately flood condenser

2. LAC fails to close due to:

a. Foreign material in valve.

b. Loss of air charge in element.

3. Wrong setting on LAC (e.g. 100 psig

on Refrigerant 22 or 502 system)

4. Discharge line to LAC restricted.

1. Charge system according to

Manufacturers Specifications or if

unavailable use Bulletin 90-30-1.

2. See Below:

a. Cause LAC to open by raising

condensing/receiver pressure

above valve setting by cycling

condenser fan. If foreign material

does not pass through valve,

replace LAC.

b. Replace LAC.

3. Replace LAC with valve with correct

setting.

4. Remove restriction in fitting(s) or line.

MALFUNCTION - HIGH HEAD PRESSURE

POSSIBLE CAUSE REMEDY

1. Dirty condenser coil.

2. Air on condenser blocked off.

3. Too much refrigerant charge.

4. Undersized receiver.

5. Non-condensable (air) in system.

6. Liquid port or liquid line plugged.

7. Wrong setting on LAC (e.g. 180 psig

on Refrigerant 12 systems).

8. Spring overheated during

installation, increasing the LAC

setting.

9. Condenser fans not running.

1. Clean coil.

2. Clear area around unit.

3. Remove charge until proper head

pressure is maintained.

4. Check receiver capacity against

refrigerant required to maintain

desired head pressure.

5. Purge from system.

6. Remove blockage in port or liquid

line.

7. Replace LAC with valve with correct

setting.

8. Replace LAC.

9. Repair or replace fan motor.

Page 4 / SD-134

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