Refrigerating Specialties Division
1
FEATURES
Unique Modular construction • Interchangeable parts • Many control variations are
possible with the use of a few Modules and kits • All common variations have no
external piping.
Pilot operated characterized V-Port for precise control • 21 kg/cm
2
(300 psig) maximum
rated pressure (MRP) • Suitable for all common refrigerants and oil.
Flanges for threaded or welded iron pipe and copper tube • Easy to service • Close-
coupled strainers.
ADAPTOMODE
®
PRESSURE REGULATORS
Series A4A
Port Size 20 mm - 100 mm (3/4" - 4")
FOR AMMONIA, R-12, R-22, R-502
OTHER REFRIGERANTS AND OIL
INDEX
PAGES
A4A Inlet Pressure Regulator .................................................... 2, 3, 4
A4AE Inlet Pressure Regulator, Remote Sensing Connection ... 2, 3, 4
A4AK Reseating Relief Regulator ............................................... 2, 3, 4
A4AL Differential Pressure Regulator .......................................... 2, 3,4
A4AO Outlet Pressure Regulator ................................................. 2, 3, 5
A4AOE Outlet Pressure Regulator,
Remote Sensing Connection ............................................. 2, 3, 5
A4AOS Outlet Pressure Regulator With Electric Shut-Off ............ 5, 6, 7
A4AOM Electrically Compensated Outlet Pressure Regulator .............. 5
PAGES
A4AS Inlet Pressure Regulator With Electric Shut-Off ................... 6, 7
A4AB Inlet Pressure Regulator With Electric
Wide Open Variation ............................................................. 6, 8
A4AD Dual Inlet Pressure Regulator ............................................... 6, 8
A4AM Electrically Compensated Inlet Pressure Regulator ........ 2, 3, 9
A4AP Pneumatically Compensated Inlet Pressure Regulator
With 1:1 Ratio .................................................................... 2, 3, 9
A4A3P Pneumatically Compensated Inlet Pressure Regulator
With 3:1 Ratio ...................................................................... 9, 10
A4AT Direct Acting Temperature Regulator .................................. 9, 10
A4AOT Reverse Acting Temperature Regulator .............................. 5, 10
INSTALLATION
All regulators are packed for maximum protection. Unpack carefully.
Check the carton to make sure all flanges and other items are unpacked.
Save the enclosed instructions for the installer and eventual user.
Do not remove the protective coverings from the inlet and outlet of the
regulator until the regulator is ready to be installed. Protect the inside
of the regulator from moisture, dirt and chips before and during
installation. When welded or brazed flange connections are used, all
slag, scale and loose particles should be removed from the flange
interior before the regulator is installed between the flanges. It is
advisable to install a close-coupled companion strainer (RSF) at the
inlet of the regulator to help protect it from any foreign material in the
system.
The A4A series of regulators will give optimum performance if mounted
in a horizontal line in a vertical position with the manual opening stem
on bottom. Where other positions are desired, the factory should be
consulted; please give application and piping details. The regulator must
be installed with the arrow on the valve body pointing in the direction of
the fluid flow for the regulator to function properly. Backward flow through
the regulator is uncontrolled and will vary with the valve model and the
reverse pressure drop encountered.
Tighten the flange bolts and nuts evenly to provide proper seating of
the flange gasket and to avoid damage to gaskets of flanges. (See
Flange Bolt Torque Table, p. 12) Avoid using the regulator flange bolts
to stretch or align pipe. Even the heavy duty semi-steel body of an
A4A can be distorted, causing the precision parts to bind.
The regulator should be installed in a location where it is easily
accessible for adjustment and maintenance. The location should be
such that the regulator can not be easily damaged by material handling
equipment. When it is necessary to insulate the regulator (and
companion strainer), the insulation should be installed to provide access
to the regulator (and companion strainer) for adjustment and
maintenance. Proper indicating gauges should be installed to be easily
visible to the operating engineer for system checking and adjusting
purposes.
Where a modular pilot solenoid or electric motor is used, it must be
connected to a circuit of the same voltage and frequency (Hz) as printed
on the nameplate of the solenoid or motor. All wiring and power sources
(such as transformers) must be adequate to supply full voltage to the
coil or motor at all times. A Flange Ring-Tube Assembly is furnished
with each Type A4AO (Outlet) and Type A4AL (Differential) Regulator
for easy field connection of outlet pressure to the regulator.
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I S O 9 0 0 1 C E R T I F I E D
