Parker A4AM-DN Installation And Service Information

Parker A4AM-DN Installation And Service Information Manual pdf 1 page image

Refrigerating Specialties Division 1BULLETIN DN23-11Type A4AM-DNFebruay 2002Installation and Service InformationElectrically CompensatedPressure RegulatorsType A4AM-DN, A4AOM-DN, & A2BM-DNPORT SIZE 3/8”-4” (20-100MM)FOR AMMONIA, R22, R134A, R502OTHER COMMON REFRIGERANTSFEATURES•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 precisecontrol•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/ECFig. 1 A4AMDescription:These heavy duty, pilot operated pressure regulators aresuitable for R-717, R-22, R-502 and other common refriger-ants and fluids approved for use in refrigeration systems. All A4Regulators are pilot operated using upstream pressure for theopening force and require a minimum 2 psi (0.14 bar) pressuredrop to fully open. These valves are generally ordered with aclose coupled upstream strainer to prevent the entrance offoreign material into the valve and the rest of the system. Thefluid temperature range for the A4 Series of Regulators is -50Fto 220F (-45C to 105C).PURPOSE:These electrically compensated A4AM inlet pressure regula-tors modulate the flow of refrigerant gas or liquid to maintain avarying upstream (or inlet) pressure in response to an electricalsignal applied to a low voltage motor mounted on a regulatorpilot. When supplied with Range D, they also can be used tocontrol condensing pressures; for example, as part of a heatreclaim system.These regulators are excellent in controlling evaporator pres-sure/temperature where load fluctuations are great, such ashot carcass chilling, warm fruit and wine chilling and coolingtunnels. They are also useful where product load is fairlyconstant but very close temperature or humidity control isdesired.When the regulator is used in a location where excessivemoisture, corrosion or explosive atmosphere exists, or in lowtemperature applications where ice could accumulate on thepilot 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 D310219