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Refrigerating Specialties Division

1

BULLETIN DN23-11

Type A4AM-DN

Februay 2002

Installation and Service Information

Electrically Compensated

Pressure Regulators

Type A4AM-DN, A4AOM-DN, & A2BM-DN

PORT SIZE 3/8”-4” (20-100MM)
FOR AMMONIA, R22, R134A, R502
OTHER COMMON REFRIGERANTS

FEATURES

 

Unique modular construction

 

Suitable for all common refrigerants and oils

 

Easy to service

 

Interchangeable parts

 

362 psig (25 bar) design pressure (PS)

 

Pilot operated characterized Modulating Plug for precise

  control

 

Manual opening stem

 

Close coupled strainers, optional

 

Stainless steel diaphragm

 

Flanges for threaded or welded steel pipe and copper tube

  (copper not for ammonia)

 

Available in most standard R/S regulator variations

   (A4AMS, A4ADM, etc...)

 

Complies with Pressure Equipment Directive 97/23/EC

Fig. 1 A4AM

Description:
These heavy duty, pilot operated pressure regulators are
suitable for R-717,  R-22, R-502 and other common refriger-
ants and fluids approved for use in refrigeration systems. All A4
Regulators are pilot operated using upstream pressure for the
opening force and require a minimum 2 psi (0.14 bar) pressure
drop to fully open. These valves are generally ordered with a
close coupled upstream strainer to prevent the entrance of
foreign material into the valve and the rest of the system. The
fluid temperature range for the A4 Series of Regulators is   -50F
to 220F (-45C to 105C).

PURPOSE:

These electrically compensated A4AM inlet pressure regula-
tors modulate the flow of refrigerant gas or liquid to maintain a
varying upstream (or inlet) pressure in response to an electrical
signal applied to a low voltage motor mounted on a regulator
pilot.  When supplied with Range D, they also can be used to
control condensing pressures; for example, as part of a heat
reclaim system.

These regulators are excellent in controlling evaporator pres-
sure/temperature where load fluctuations are great, such as
hot carcass chilling, warm fruit and wine chilling and cooling
tunnels.  They are also useful where product load is fairly
constant but very close temperature or humidity control is
desired.

When the regulator is used in a location where excessive
moisture, corrosion or explosive atmosphere exists, or in low
temperature applications where ice could accumulate on the
pilot valve stem, the A4AR with A2BM remote pilot can be used.
(See Fig. 7)

I S O   9 0 0 1   C E R T I F I E D

310219

Содержание A2BM-DN

Страница 1: ...psi 0 14 bar pressure drop to fully open These valves are generally ordered with a close coupled upstream strainer to prevent the entrance of foreign material into the valve and the rest of the system...

Страница 2: ...s reached Turning the adjusting screw in will lower the pressure turning it out will raise the pressure If after several hours of operation the tempera ture is not as desired readjust the pressure adj...

Страница 3: ...24 volts AC Fixed stroke 160o No auxiliary switches This motor is used with controllers that provide a stable noise free proportional output of 4 20mA nominal 25mA maximum See Fig 13 Model M6281A 100...

Страница 4: ...is controlling at the lower of two set points This would be the electrically compensated low pres sure pilot doing the controlling When the pilot solenoid is de energized the regulator is controlling...

Страница 5: ...losing 35 Dirt Wiper Retainer 36 Dirt Wiper 37 Seal Bottom Cap 38 Bottom Cap 39 Screw Bottom Cap 40 Packing Washer 41 Packing Ring 42 Stuffing Box Nut 43 Gasket Seal Cap 44 Seal Cap 45 Gasket Flange 4...

Страница 6: ...ntal line in a vertical position with the manual opening stem on bottom Where other positions are desired the factory should be consulted please give applica tion and piping details To function proper...

Страница 7: ...1 Screw Body 32 Body 33 Throttling Plug Asm 34 Spring Closing 35 Dirt Wiper Retainer 36 Dirt Wiper 37 Seal Bottom Cap 38 Bottom Cap 39 Screw Bottom Cap 40 Packing Washer 41 Packing Ring 42 Stuffing Bo...

Страница 8: ...iaphragm Follow er 16 Gasket Bonnet 17 Diaphragm 18 Seat Pilot 19 Gasket Adapter 20 Valve Body 21 Plug 76 Motor 77 Cam Lock Screw 78 Motor Cam 79 Motor Mounting Screw 80 Cam Follow er Asm 81 Lock Nut...

Страница 9: ...nship and materials for a period of one 1 year from date of shipment from originating factory This warranty is in force only when products are properly installed field assembled maintained and operate...

Страница 10: ...14 1 1 5 8 239 9 4 N ODS TUBE 7 8 19 0 8 1 3 8 25 1 0 1 5 8 28 1 1 2 5 8 38 1 5 3 1 8 43 1 7 4 1 8 55 2 2 ENGAGE 1 1 8 23 0 9 1 5 8 28 1 1 2 1 8 33 1 3 3 1 8 43 1 7 3 5 8 48 1 9 MENT 1 3 8 25 1 0 2 1...

Страница 11: ...Refrigerating Specialties Division 11 Fig 12 M6281A 1009 Fig 11 Penn M150 JGA Fig 13 M7284A 1020 Fig 10 M9181A 1012...

Страница 12: ...40 3 COVER BOTTOM A4A S4A 1 5 8 to 2 1 2 DUCTILE IRON GGG 40 3 BONNET A4W DUCTILE IRON GGG 40 3 COMPONENT DESCRIPTION MATERIAL Kv VOLUME BODY 2 A4A DN DUCTILE IRON GGG 40 3 42 4 1 61 L ADAPTER 2 A4A D...

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