Parker A4W Series Installation, Service And Parts Information
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Parker A4W Series Installation, Service And Parts Information

Parker A4W Series Installation, Service And Parts Information

Adaptomode weld-end pressure regulators, port size 125-200mm 5"-8" for ammonia, r12, r22, r502 and other common refrigerants
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ADAPTOMODE WELD-END
PRESSURE REGULATORS
Types: A4W, A4WE, A4WS, A4WB,
A4WD, A4WP, A4WOE, A4WR
Port Size 125-200mm (5"-8")
FOR AMMONIA, R12, R22, R502
AND OTHER COMMON REFRIGERANTS
FEATURES
• Cast Steel Body – Strong, Lightweight.
• Welds Directly in the Line – No Flanges.
• Removable Seat – Serviceable from Top Side.
• Streamlined Fluid Flow Pattern.
• Unique Modular Construction – Same Modules
as A4A Series.
• Interchangeable Parts.
• Easy to Service.
• Pilot Operated Characterized Modulating Plug for
Precise Control.
• Suitable for All Common Refrigerants and Oil.
• 27.6 bar (400 psig) Maximum Rated Pressure (MRP).
• Many Control Variations are Possible with the Use
of a Few Modules and Kits.
• Stainless Steel Diaphragm.
• Chrome Plated Pilot Seat.
• Manual Opening Stem.
Seal Cap
Manual
Opening
Stem
Power
Piston
Removable Seat
Fig. 1 - A4W, A4WE
Refrigerating Specialties Division
050405
Seal Cap
Adjusting Stem
Range Spring
Diaphragm
Gauge Port
Pilot Seat
Modulating
Plug
Closing
Spring
1
BULLETIN 23-20D
A4W Series
August 2007
Installation, Service and Parts Information
Item ...................................................................................... Page
A4W .............................................................................................1
A4WB ...........................................................................................3
A4WD ............................................................................................4
A4WE ........................................................................................... 2
A4WOE ...................................................................................... 2, 4
A4WP ............................................................................................4
A4WR ............................................................................................5
A4WS ............................................................................................3
Adjustment, Range ......................................................................2
Assembly ......................................................................................6
Dimension Drawings ............................................................ 12, 13
Disassembly .................................................................................6
Electrical ......................................................................................5
Installation ...................................................................................5
Mintenance and Service ...............................................................8
Manual Opening Stem ............................................................ 8, 9
Pressure Setting Ranges .............................................................2
Safe Operation .......................................................................... 14
Torques, Fastener and Seat ........................................................7
Trouble Shooting ........................................................................ 9
Warning .....................................................................................14
Warranty .....................................................................................14
Description
These heavy duty, cast steel bodied (ASTIM No. A352 Grade
LCB), pressure regulators weld directly in the line and do not
require fl anges.
They are used for control of Ammonia, R-12, R-22 and R-502,
and other common refrigerants, certain oils and other fl uids
approved for use in refrigeration systems.
The A4W Series Regulators are pilot operated, using upstream
pressure for the moving force, and require a minimum 0.14 bar
(2 psi) pressure drop to fully open. The basic Type A4W is an Inlet
Pressure Regulator which tends to open on a rise in upstream
pressure above set-point and to close on a drop in pressure
below set-point.
These valves can be ordered with the Type RSW Strainer to be
welded directly to the inlet of any of the Type A4W Regulators
or use a 13mm (1/2") Type RSF Strainer in only the pilot circuit
of a Type A4WE or A4WR version of the regulator.
The A4W Series of regulators uses the same Modules as does
the A4A Series to confi gure many possible variations.
ISO 9001:2000 CERTIFIED
Index

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Summary of Contents for Parker A4W Series

  • Page 1 13mm (1/2”) Type RSF Strainer in only the pilot circuit of a Type A4WE or A4WR version of the regulator. Fig. 1 - A4W, A4WE The A4W Series of regulators uses the same Modules as does the A4A Series to confi gure many possible variations. Refrigerating Specialties Division...

  • Page 2: A4We

    Purpose Adjustment The purpose of the Type A4W Series of Pressure Regulators is to INLET PRESSURE REGULATORS - A4W - (See Fig. 1) Install an modulate the fl ow of refrigerant gas and/or liquid so as to maintain accurate pressure gauge in the gauge port. Back the Adjusting a constant set for pressure, regardless of load fl...

  • Page 3: A4Wb

    The pressure as measured at the connection to the valve must be Purpose no less than the pressure at the valve inlet. The Type A4WB frequently is used in the wide-open mode when maximum refrigeration capacity from an evaporator is required. A 13mm (1/2”) Type RSF strainer can be installed in the above line During the defrost of the evaporator, the regulator pilot solenoid to protect the critical pilot circuit of the main valve and eliminate...

  • Page 4: A4Wd

    Energize the solenoid pilot and adjust the integral pressure pilot thus providing a low limit feature to the regulator. Next, connect for the desired low pressure setting following the same procedure. the air line. From this point the regulator’s set-point will be The modular (bolt-on) pilot MUST be adjusted for a set-point increased on a 1:1 ratio with the air pressure increase.

  • Page 5: A4Wr

    The pressure on top of the Piston is controlled by the fl ow through Adjustment the Pilot Plug and the bleed through the bleed hole in the Piston. See the appropriate bulletin as listed above under “Principles of Due to the Seal Ring fi tted to the Piston, the amount of bleed to Operation”.

  • Page 6: Assembly

    operate with line voltage from 85% to 110% of rated coil voltage. standard Refrigerating Specialties solenoid valve is a 1/4-20 screw Operating with a line voltage above or below these limits may that can be used for this purpose.) result in coil burn-out. Also, operating with line voltages below If the Piston 9 cannot be removed as suggested above then use the limit will defi...
  • Page 7 Clean the sealing surfaces where the Adapter-to-Body Gasket 5 is to beinstalled and insert a new Gasket in position, making sure to line up the hole in the Gasket with the passage “N” hole (see Fig. 1) in the Valve Body 1. The gasket should have a very light fi lm of refrigerant oil applied to both surfaces before inserting in place.

  • Page 8: Manual Opening Stem

    Maintenance and Service Dirt in the system is the greatest single cause of regulator malfunction. All screens or fi lters must be cleaned or replaced when they become dirty. At start up, or when changes or additions are made, it is especially important that these items are cleaned or changed frequently.

  • Page 9: Troubleshooting Suggestions

    TROUBLE SHOOTING SUGGESTIONS SYMPTOM PROBABLE REASON CORRECTION Diaphragm or Pilot Seat dirty, damaged Clean or replace. Clean strainer. Regulator does not or frozen. shut off fl ow. Diaphragm follower stuck or damaged. Clean or replace. Install follower carefully. Piston jammed with excess dirt. Remove Piston and clean dirt from Seal Ring and groove.
  • Page 10 Parts Kits Which Are Common To All A4W Port Sizes (including A4W, A4WE, A4WS, A4WB, A4WD, A4WP, A4WOE and A4WR) Item No. Description and Contents Qty. Kit No. Item No. Description and Contents Qty. Kit No. Plug Kit, Pilot, A4WOE 200778 Stem Kit, Adjusting 202120...

  • Page 11: Manual

    Fig. 9 - S6A Pilot Fig. 8 Refrigerating Specialties Division...
  • Page 12 Fig. 12 A4WE A4WP A4WL A4WOE A4WR A4WB A4WS For All Sizes “e” is 75mm - 3.0 in. “f” is 100mm -4.0 in. “g” is 140mm - 5.5 in. A4WD Refrigerating Specialties Division...
  • Page 13 TABLE OF DIMENSIONS DIMENSION VALVE VALVE SIZE VARIATION mm 125 Common to All 15.0 10.5 10.75 A4W, A4WE 438* 17.25* A4WP, A4WL 438* 17.25* 12.5 A4WOE 463* 18.25* 12.0 A4WR 414** 16.25** 12.0 A4WB, A4WS 476* 451 ** 18.75* 17.75** A4WD 502* 476**...

  • Page 14: Warranty

    It is important that pricing, are subject to change by Parker Hannifi n Corporation you analyze all aspects of your application and review and its subsidiaries at any time without notice.

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