Parker A4AM-DN Operating and installation instructions

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
PORTSIZE3/8”-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-
antsandfluidsapprovedforuseinrefrigerationsystems.AllA4
Regulators are pilot operated using upstream pressure for the
openingforce and requirea minimum 2psi (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
fluidtemperaturerangefortheA4SeriesofRegulatorsis -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
varyingupstream(orinlet)pressureinresponsetoanelectrical
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
pilotvalvestem,theA4ARwithA2BMremotepilotcanbeused.
(See Fig. 7)
ISO 9001 CERTIFIED
310219

Refrigerating Specialties Division 2
Important Note:
The motor cover should be kept on the motor at all times to
protect it from dust and mechanical damage. No lubrication of
the motor is required.
PRINCIPLES OF OPERATION, A4AM (SEE FIG. 1)
Themotorwillrespondto a signalfrom a suitablecontroller, for
example, a thermostat. When the temperature at the sensing
element changes the thermostat, the motor responds immedi-
ately to the signal by rotating the motor shaft. This rotation is
transmittedthroughthecamtothevalvestemandrangespring
tochange theset-point bychanging the springpressure acting
on top of the diaphragm. Whether used as part of a cooling
system to control evaporator pressure, or as part of a heat
reclaim system to control condensing pressure, an increase in
temperature at the thermostat will decrease the spring pres-
sure and lower the inlet pressure thus lowering the evaporator
or condenser temperature. Normally cam rotation is 160 de-
grees and one minute of time is required for the full cam
rotation. Amotorwith240degreesand1.5minuterotationtime
is available and must be so ordered.
TheprinciplesofoperationoftheA4AMSeriesarethesameas
forthebasicA4regulator except forthe varying set-pointof the
motorized pressure pilot. The inlet refrigerant pressure enters
thespace underthe diaphragmthrough passageN. When the
force created by the inlet pressure exceeds the varying spring
force, the diaphragm is lifted off of the pilot seat allowing
pressure to enter the top of the power piston. This causes the
powerpistontomove downward forcingthe modulating plugto
open and modulate to maintain the varying set-point pressure
as dictated by the temperature controller signal to the motor.
An increase in refrigerant inlet pressure, above the set-point
pressure setting, lifts the diaphragm further to allow more
pressureontop ofthe powerpistonand opens thevalvewider.
A decrease in inlet pressure, below the varying set-point
pressure setting, causes the diaphragm to move closer to the
pilot seat reducing the pressure to the top of the piston and
causing the closing spring to reduce the valve opening. The
pressure on top of the piston is controlled by the flow through
the bleed hole in the power piston and through the clearances
between the piston and main valve cylinder. A minimum of 2
psi (0.14 bar) pressure drop across the valve is required in
order for it to open fully.
ADJUSTMENT A4AM
Adjust the controller sensitivity to the desired point according
to the manufacturer’s directions. Open the regulator manually
(manualopeningstembackedout)andrunthesystemuntilthe
temperature at the sensing element reaches the desired level.
Adjust the controller (thermostat) setting to a reading that will
cause the cam of the motor to rotate and stop in center cam
position. Put the regulator back into automatic operation by
turning the manual opening stem in until just the flats on the
stemarevisible. Loosen the pressureadjusting screwlocknut
and turn the adjusting screw until the desired inlet pressure for
this temperature and load condition is reached. Turning the
adjustingscrewinwilllowerthepressure;turningitoutwillraise
the pressure. If after several hours of operation the tempera-
ture is not as desired, readjust the pressure adjusting screw
slightly. Once the desired setting is reached, make sure the
lock nut is tightened. The valve will now modulate in response
to load variation to maintain constant temperature.
PRINCIPLES OF OPERATION, A4AOM (SEE FIG. 2)
Thispressureregulatormodulatestheoutletpressureinaccor-
dance to load requirements as sensed by an electric thermo-
stat or humidistat that varies an electric signal applied to a
motor mounted on the regulator pilot. The motor operation is
describedabove forA4AM, exceptthe A4AOM operatesas an
outlet pressure regulator. Available in standard Range V or
Range D.
Theoutletpressureissensedunderthediaphragmthroughthe
sensing tube, which is part of the Flange Ring-tube assembly.
Whenthe force createdby the outletpressure acting underthe
diaphragm is less than the force of the range spring, the pilot
plug is open, allowing pressure to enter on top of the piston.
Thiscausesthepowerpistontoforcethethrottlingplugtoopen
to maintain constant outlet pressure. Decrease in the outlet
pressure allows the range spring to open the pilot plug further,
allowing more pressure on top of the piston and opening the
throttlingplugfurther. An increasein theoutletpressure will lift
the diaphragm against the force of the range spring, allowing
thepilot plug tostart closing. The pressureontop ofthepower
piston is decreased and the closing spring acts to reduce the
opening of the throttling plug and the flow of fluid through the
regulator. Thepressureontopofthepowerpistoniscontrolled
bytheflow through the pilotseatandthebleed through ableed
hole in the power piston and through the clearance between
the piston and the cylinder. A minimum of 2 psi (0.14 bar)
pressure drop across the regulator is required to open it fully.
ADJUSTMENT A4AOM
Adjust the controller sensitivity to the desired point according
to the manufacturer’s directions. Open the regulator manually
(manualopeningstembackedout)andrunthesystemuntilthe
temperature at the sensing element reaches the desired level.
Adjust the controller (thermostat) setting to a reading that will
cause the cam of the motor to rotate and stop in center cam
position. Put the regulator back into automatic operation by
turning the manual opening stem in. Loosen the pressure
adjusting screw lock nut and turn the adjusting screw until the
desired inlet pressure for this temperature and load condition
is reached. Turning the adjusting screw in will lower the
pressure; turning it out will raise the pressure. If after several
hours of operation the temperature is not as desired, re-adjust
thepressureadjustingscrew slightly. Once thedesired setting
is reached, make sure the lock nut is tightened. The valve will
now modulate in response to load variation to maintain con-
stant temperature.
MANUAL OPENING STEM:
All Type A4 Regulators are provided with a manual opening
stem. To open the regulator manually, back the stem out (turn
counter-clockwise) until it stops. To put the regulator into
automatic operation, turn the stem in (clockwise) until only the
flats on the stem protrude from the packing nut.

Refrigerating Specialties Division 3
OPTIONS
Ranges
AvailableinRangesA,VandD.Honeywellmotorhas160ocam
rotation which is equivalent to a change in set-point of 60 psi
(4.1 bar) for Ranges A or V, or 106 psi (7.3 bar) for Range D;
Penn motor has 240o cam rotation which changes set-point 90
psi (6.2 bar) for Ranges A or V, or 159 psi (10.9 bar) for Range
D.
Motors
Model: M9181A-1012 Honeywell Inc.
Features: Reversing, proportional motors used to operate
valvesordampersinelectricmodulatingcircuits.Oil immersed
motor and gear train for reliable performance and long life.
Wiring box provides NEMA 3 weather protection. Actuator
motor and circuitry operate from 24 volts AC. Fixed stroke,
160o. No auxiliary switches. The controller type is a 135 ohm
Honeywell Series 90 proportional controller (See Fig. 10).
Model: M7284A-1020 Honeywell Inc.
Features: Electronic Modutrol motors used to control dampers
and valves. This motor accepts a current signal from an
electronic controller to position a damper of valve at any point
between open and closed. Oil immersed motor and gear train
for reliable performance and long life. Wiring box provides
NEMA 3 weather protection. Actuator motor and circuitry
operate from 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-1009 Honeywell Inc.
Features: Floating control motor with an internal electrically
isolated feedback potentiometer. This motor is used with
controllers that provide SPDT or floating output to operate
dampers or valves. The feedback potentiometer provides an
indication of the motors shaft position and can be used for
slaving Series 90 motors or rebalancing an external control
circuit.WiringboxprovidesNEMA3weatherprotection.Actua-
tor motor and circuitry operate from 24 volts AC. Fixed stroke,
160o. No auxiliary switches (See Fig. 12).
Model: M6191B-1006 Honeywell Inc.
Features:Non-spring return, 3-wire floating control motor. This
motorisusedwithcontrollersthatprovideaswitchedorfloating
SPDT output to operate dampers or valves. Actuator motor
andcircuitry operatefrom24voltsAC.Fixed stroke,160o.One
(1), auxiliary switches (See Fig. 14).
Model: M150-JGA-1 Penn Johnson
Features: The M100J motor actuators are used to position
valves and dampers in heating ventilating, air conditioning,
refrigeration and industrial applications. The motor accepts a
Johnson Controls 0 to -2 VDC electronic controller input, or a
0to+24 VDC input,ora 3-wire 135to 1000ohmpotentiometer
input (See Fig. 11).
Fig 2. A4AOM

Refrigerating Specialties Division 4
OTHERCONFIGURATIONS
A4AMS
Description
TheTypeA4AMSisanelectricallycompensatedinletpressure
regulator with a pilot electric shut-off. The integrally mounted
solenoid must be energized for the valve to function as a
regulator. Whende-energized,the regulator isclosed,regard-
less of inlet pressure.
Purpose
The Type A4AMS should be used whenever it is required to
stop all flow (in the normal fluid flow direction) through the
regulator. Thiscould includeuseindefrostapplicationsandas
part of a temperature control system.
PRINCIPLES OF OPERATION, A4AMS
The operation of the A4AMS is the same as that described on
Page 2, except the inlet pressure from passage N must first
pass through the S6A pilot solenoid before it can reach the
diaphragm. Thus, the S6A pilot solenoid must be energized
before the A4AMS can begin to regulate, regardless of inlet
pressure (See also Bulletin D23-06).
Adjustment, A4AMS
With the solenoid pilot energized, proceed as described under
Adjustment A4AM.
A4ABM
Description
The Type A4ABM is an inlet pressure regulator with a pilot
electric wide opening feature. When the integrally mounted
solenoid is energized, the valve is wide open, thereby bypass-
ing the regulator function; i.e., not regulating. However, in the
wide open mode the regulator will still require the 2 psi (0.14
bar) minimum pressure drop. When the solenoid is de-
energized, the valve functions as an electrically compensated
inlet pressure regulator.
Purpose
The Type A4ABM frequently is used with the wide open
function,wheremaximumrefrigerationcapacityfromtheevapo-
rator is required for some period of time. With the solenoid de-
energized, the regulator is electrically compensated.
Principle of Operation A4ABM
The operation of the A4ABM is the same as that described on
Page 2 when operating as a regulator (pilot solenoid de-
energized). When the solenoid is energized the upstream
pressure from passage N bypasses the underside of the
diaphragm and is fed directly to the top of the piston where,
provided a 2 psi (0.14 bar) pressure difference exists across
the main valve throttling plug will be held open (See also
Bulletin D23-06).
Adjustment, A4ABM
With the solenoid pilot electrically de-energized, proceed as
described under Adjustment A4AM.
A4ADM
Description
The Type A4ADM is a Dual Inlet Pressure Regulator capable
of regulating at two (2) pressure levels, one a fixed set-point
and the other being the electrically compensated set-point.
When the integrally mounted S6A pilot solenoid valve is
energized, the regulator 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 at the higher set-point,
which must be adjusted on the bolt-on (outboard) pressure
pilot.
Note: The high pressure pilot must always be set higher than
what the electrically compensated pilot can reach in order to
prevent the high pressure pilot from controlling when not
required.
Purpose
The Type A4ADM uses are similar to those for the A4ABM
except, instead of operating in a wide open position when the
pilot solenoid is energized, the regulator is controlling the inlet
pressure through the motorized pressure pilot in response to
an electric signal from its controller.
Typical uses include capacity control of an evaporator at
different pressure levels to regulate temperature at varying
loadconditions(Lowpressurecompensatingpilot),andevapo-
rator pressure control combined with defrost pressure relief
(high pressure pilot).
Principles of Operation, A4ADM
The operation of the A4ADM is similar to that described on
Page 2. When the Pilot Solenoid is energized, upstream
pressure from passage N is made available to both pressure
pilot diaphragms. Since the path of least resistance will be
throughthe pressure pilotwiththe lowerset-point(lower range
spring force), that pilot will control.
When the pilot solenoid is de-energized, upstream pressure
from passage N can flow only to the higher pressure pilot,
which will then control the regulator (See also Bulletin D23-
06).
Adjustment A4ADM
Electricallyde-energizethesolenoidpilotandadjustthemodu-
lar(bolton)pressurepilotforthedesired high pressure setting.
Removethesealcapontopofthehighpressurepilot(outboard
pilot) and turn the adjusting stem clockwise to increase setting
or counter clockwise to decrease setting. Final adjustment
should be made after the system has been operating for a
period of time. Electrically energize the pilot solenoid and
adjustthemotorizedpressurepilot(lowpressure)asdescribed
under Adjustment A4AM.
A2BM
Principles of Operation, A2BM (See Fig. 5)
The A2 type pressure regulators are compact, direct dia-
phragm operated, for use with refrigerant liquid or vapor. The
A2BMandA2AMareinletpressureregulatorsthatpreventinlet
(or upstream) pressure from falling below set-point. They will
tend to open on a rise in inlet pressure above set-point and will
be closed below set-point. The pressure regulator will have a
varyingsetpointinaccordancetoloadrequirementsassensed
by an electric thermostat or humidistat that varies an electric
signal to a motor mounted on the regulator bonnet. The motor
operation is as described on Page 2 for A4AM.

Refrigerating Specialties Division 5
Fig. 3 A4AM
Item Description
8 Bonnet
9Nameplate
10 Screw , Nameplate
11 Screw , Bonnet
12 Spring Rest, Upper
13 Spring, Range
14 Spring Rest, Low er
15 Diaphragm Follow er
16 Gasket, Bonnet
17 Diaphragm
18 Seat, Pilot
19 Gasket, Adapter
27 Gauge Port Pipe Plug
28 Adapter, Body
29 Gasket, Body
30 Piston-Stem
31 Screw , Body
32 Body
33 Throttling Plug Asm
34 Spring, Closing
35 Dirt Wiper Retainer
36 Dirt Wiper
37 Seal, BottomCap
38 BottomCap
39 Screw , Bottom Cap
40 Packing Washer
41 Packing Ring
42 Stuffing Box Nut
43 Gasket, Seal Cap
44 Seal Cap
45 Gasket, Flange
46 Bolt, Flange
47 Nut, Flange
76 Motor
77 CamLock Screw
78 Motor Cam
79 Motor Mounting Screw
80 CamFollower Asm
81 Lock Nut
82 Pressure Adjusting Scre
w
83 Mounting Post
84 Guide Post
85 Guide Post Locknut
86 Mounting Plate
87 Actuating Stem
88 Stuffing Box Nut
89 Packing Ring
90 StemInsert
For replacement parts and prices, consult
PARTS KITS LIST PRICE SCHEDULE INDUSTRIAL
AND FLO-CON (PK)

Refrigerating Specialties Division 6
The inlet pressure acts on the diaphragm. When the force
created by the pressure exceeds the force of the range spring,
the diaphragm is lifted off of the valve seat and flow occurs
through the valve seat, from the regulator inlet to the outlet.
Increased inlet pressure lifts the diaphragm further, allowing
increased flow. Decrease in inlet pressure causes the dia-
phragm to move closer to the valve seat, reducing the flow.
Thus, the regulator acts to maintain the inlet pressure approxi-
matelyconstant. If theinletpressuredropsbelowtheregulator
setting, the diaphragm closes off the flow to keep the inlet
pressurefromgoingbelowthesetpoint,subjecttolimitsofseat
leakage tolerance, or leakage due to dirt particles on the seat
surfaces.
Adjustment, A2BM
Adjust the controller sensitivity to the desired point according
to the manufacturer’s directions. Loosen the pressure adjust-
ing screw lock nut and adjust pressure screw until disengaged
with the valve actuating stem. Run the system until the tem-
perature at the sensing element reaches the desired level.
Adjust the controller (thermostat) setting to a reading that will
cause the cam of the motor to rotate and stop in center cam
position. Turn the adjusting screw to engage the valve actuat-
ing stem, and adjust until the desired inlet pressure for this
temperatureandloadconditionisreached. Turningtheadjust-
ing screw in will lower the pressure; turning it out will raise the
pressure. If after several hours of operation the temperature is
not as desired, readjust the pressure adjusting screw slightly.
Once the desired setting is reached, make sure the lock nut is
tightened. The valve will now regulate in response to load
variation to maintain constant temperature.
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.
Donotremovetheprotectivecoveringsfromtheinletandoutlet
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
connectionsareused,allslag,scaleandlooseparticlesshould
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 A4 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 applica-
tionand piping details.Tofunction properly,theregulator must
be installed with the arrow on the valve body pointing in the
direction of the fluid flow. Backward flow through the regulator
is uncontrolled and will vary with valve model and the reverse
pressure drop encountered.
Tighten the flange bolts and nuts evenly to provide proper
seatingofthe flangegasket andtoavoid damage togasketsor
flanges (See Flange Bolt Torque Table). Avoid using the
regulator flange bolts to stretch or align pipe. Even the heavy
body of an A4 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
shouldbesuchthattheregulatorcannotbeeasilydamagedby
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. Do not insulate the
solenoid coil and coil housing. Proper indicating gauges
shouldbeinstalledtobeeasilyvisibletotheoperatingengineer
for system checking and adjusting purposes.
Maintenance and Service
General Procedure:
Dirt in the system is the greatest single cause of regulator
malfunction. All screens or filters should be cleaned or re-
placed when they become dirty. At start-up, it is especially
important that these items are cleaned or changed frequently.
When the RSF close-coupled companion strainer is used,
maintain according to instruction in Bulletin 00-10. Moisture in
halocarbon systems in particular, can cause corrosion or form
ice, causing the piston to freeze in position. Filter-dryers
should be used and maintained for halocarbon systems.
Before deciding to disassemble a regulator for servicing, the
following investigations should be made:
Check the manual opening stem; it should be turned in for
automatic operation.
Check the cam and cam follower alignment. There should be
clearance between the cam and follower on both sides.
Checkforsmoothactuatingstemmovementwithcam rotation.
The packing nut should be tight enough to prevent moisture
penetration and loose enough to permit smooth stem stroking.
Check regulator pressure range; if wrong, range spring must
be replaced.
Check other system components for proper operation.
Check hand valves in the system to make sure they are open
or closed as required and the system is receiving liquid or gas,
as the case may be.
Before disassembly of regulator, make certain that all refriger-
ant has been removed (pumped out) from the regulator and its
companion strainer where one is used.
Read Safety Bulletin RSBCV.

Refrigerating Specialties Division 7
Fig. 4 A4AOM
Item Description
8 Bonnet
9 Nameplate
10 Screw, Nameplate
11 Screw, Bonnet
12 Spring Rest, Upper
13 Spring, Range
14 Spring Rest, Lower
15 Diaphragm Follow er
16 Gasket, Bonnet
17 Diaphragm
19 Gasket, Adapter
20 Flg Ring-tube Asm
21 Adapter, A4AO
22 Spring Nut
23 Spring, Pilot Plug
24 Pilot Plug
25 O-Ring Seal
26 O-Ring, Pilot Plug
27 Gauge Port Pipe Plug
28 Adapter, Body
29 Gasket, Body
30 Piston-Stem
31 Screw, Body
32 Body
33 Throttling Plug Asm
34 Spring, Closing
35 Dirt Wiper Retainer
36 Dirt Wiper
37 Seal, BottomCap
38 BottomCap
39 Screw, Bottom Cap
40 Packing Washer
41 Packing Ring
42 Stuffing Box Nut
43 Gasket, Seal Cap
44 Seal Cap
45 Gasket, Flange
46 Bolt, Flange
47 Nut, Flange
76 Motor
77 CamLock Screw
78 Motor Cam
79 Motor Mounting Screw
80 Cam Follow er Asm
81 Lock Nut
82 Pressure Adjusting Screw
83 Mounting Post
84 Guide Post
85 Guide Post Locknut
86 Mounting Plate
87 Actuating Stem
88 Stuffing Box Nut
89 Packing Ring
90 StemInsert
For replacement parts and prices, consult
PARTS KITS LIST PRICE SCHEDULE INDUSTRIAL
AND FLO-CON (PK)

Refrigerating Specialties Division 8
Fig. 6
Item Description
8 Bonnet
9 Nameplate
10 Screw , Nameplate
11 Screw, Bonnet
12 Spring Rest, Upper
13 Spring, Range
14 Spring Rest, Low er
15 DiaphragmFollower
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
82 Pressure Adjusting Screw
83 Mounting Post
84 Guide Post
85 Guide Post Locknut
86 Mounting Plate
87 Actuating Stem
88 Stuffing Box Nut
89 Packing Ring
90 StemInsert
Fig. 5 A2BM

Refrigerating Specialties Division 9
Safe Operation (See also Bulletin RSBCV)
People doing any work on a refrigeration system must be
qualified and completely familiar with the system and the
Refrigerating Specialties Division valves involved, or all other
precautions will be meaningless. This includes reading and
understanding pertinent Refrigerating Specialties Division
product bulletins and Safety Bulletin RSBCV prior to installa-
tion or servicing work.
Wherecoldrefrigerantliquidlinesareused,it is necessary that
certain precautions be taken to avoid damage that could result
from liquid expansion. Temperature increase in a piping
section full of solid liquid will cause high pressure, due to the
expanding liquid that can possibly rupture a gasket, pipe or
valve.Allhandvalvesisolatingsuchsectionsshouldbemarked,
warning against accidental closing, and must not be closed
until the liquid is removed. Check valves must never be
installedupstream ofsolenoidvalvesorregulatorswith electric
shut-off, nor should hand valve upstream of solenoid valves or
downstreamof checkvalvesbecloseduntiltheliquidhasbeen
removed. It is advisable to properly install relief devices in any
section where liquid expansion could take place.
Avoid all piping or control arrangements that might produce
thermal or pressure shock. For the protection of people and
products,allrefrigerantmustberemovedfromthesectiontobe
worked on before a valve, strainer, or other device is opened
orremoved. FlangeswithODSconnectionsarenotsuitablefor
ammonia service.
Warranty
All Refrigerating Specialties products are warranted against
defects in workmanship 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 operated in use and service
as specifically stated in Refrigerating Specialties catalogs or
bulletins for normal refrigeration applications, unless other-
wise approved in writing by Refrigerating Specialties Division.
Defective products or parts of returned to the factory with
transportation charges prepaid and found to be defective by
factory inspection will be replaced or repaired at Refrigerating
Specialties option, free of charge F.O.B. factory. Warranty
does not cover products that have been altered or repaired in
thefield,damagedin transit as a result of accidents, misuse, or
abuse. Products disabled by dirt or other foreign substances
will not be considered defective.
The express warranty above constitutes the only warranty of
Refrigerating Specialties products and is in lieu of all other
warranties, expressed or implied, written or oral, including any
warranty of merchantability or warranty of fitness for a particu-
lar purpose. In no event is Refrigerating Specialties respon-
sible for any consequential damages of any nature whatso-
ever. Noemployee,agent,dealerorotherpersonisauthorized
to give any warranties on behalf of Refrigerating Specialties
norto assume forRefrigeratingSpecialties anyotherliability in
connection with any of it products.
Fig. 7
BOLT TORQUE TABLE
ITEM PORT SIZE TORQUE
7/16" Flange Bolt 1/2" 28 ft lb
5/8" Flange Bolt 3/4" - 2" 85 ft lb
3/4" Flange Bolt 2-1/2" - 3" 105 ft lb
7/8" Flange Bolt 4" 150 ft lb
5/16"-18 Bonnet Bolt 3/4" - 4" 11 ft lb
5/16"-18 Adapter Bolt 3/4" - 2" 11 ft lb
5/8"-11 Adapter Bolt 3" - 4" 75 ft lb
Bottom Cap 3/4"- 1-1/4" 150 ft lb
1/2"-13 Bottom Cap Bolt 1-5/8" - 2-1/2" 50 ft lb
5/8"-11 Bottom Cap Bolt 3"-4" 75 ft lb

Refrigerating Specialties Division 10
Fig. 8
OVERALL LENGTH DIMENSIONS WITH FLANGES
PORT 3/4" & 1" 1-1/4" 1-5/8" & 2" 2-1/2" 3" 4"
SIZE ('20 & 25 MM) (32 MM) (40 & 50 MM) 65 MM 75 MM 100 MM
DIMENSION PIPE SIZE MM INCH PIPE SIZE MM INCH PIPE SIZE MM INCH PIPE SIZE MM INCH PIPE SIZE MM INCH PIPE SIZE MM INCH
D FPT & SW 1/2" 216 8.5 1-1/4" 256 10.1 1-1/2" 307 12.1 2-1/2" 331 13.0 3" 389 15.3 3-1/2" 450 17.7
FOR PIPE 3/4" 216 8.5 1-1/2" 256 10.1 2" 256 12.1 4" 450 17.7
SIZES 1" 216 8.5
SHOWN 1-1/4" 216 8.5
E WN FOR 3/4" 254 10.0 1-1/4" 300 11.8 1-1/2" 364 14.3 2-1/2" 401 15.8 3" 478 18.8 4" 571 22.5
PIPE SIZES 1" 261 10.3 1-1/2" 304 12.0 2" 371 14.6
SHOWN 1-1/4" 261 10.3
F ODS FOR 7/8" 239 9.4 1-3/8" 269 10.6 1-5/8" 358 14.1 2-5/8" 348 13.7 3-1/8" 414 16.3 4-1/8' 503 19.8
TUBE SIZES 1-1/8" 239 9.4 1-5/8' 279 11.0 2-1/8" 338 13.3 3-1/8" 389 15.3 3-5/8" 432 17.0
SHOWN 1-3/8" 231 9.1 2-1/8" 305 12.0 2-5/8" 358 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 2-1/8" 33 1.3 2-5/8" 38 1.5
1-5/8' 28 1.1
P SW PIPE 1/2" 13 0.5 1-1/4" 15 0.6 1-1/2" 15 0.6 2-1/2" 25 1.0 3" 29 1.1 3-1/2" 32 1.3
ENGAGE- 3/4" 13 0.5 1-1/2" 15 0.6 2" 15 0.6 4" 32 1.3
MENT 1" 13 0.5
1-1/4" 18 0.7
A4AM OVERALL VALVE DIMENSIONS
PORT 3/4" & 1" 1-1/4" 1-5/8" & 2" 2-1/2" 3" 4"
SIZE (20 & '25 MM) (32 MM) (40 & 50 MM) 65 MM 75 MM 100 MM
DIMENSION MM INCH MM INCH MM INCH MM INCH MM INCH MM INCH
A A4AM 597 23.5 615 24.2 668 26.3 688 27.1 803 31.6 859 33.8
A A4AOM 620 22.4 638 23.1 691 25.2 711 26.0 826 32.5 882 34.7
B (ALL TYPES) 148 5.8 162 6.3 177 6.9 181 7.1 273 10.7 292 11.5
C (ALL TYPES) 164 6.2 203 8.0 251 9.9 252 9.9 311 12.2 359 14.1
G (ALL TYPES) 98 3.9 178 7.0 251 9.9 314 12.4 314 12.4 363 14.3
H (ALL TYPES) 117 4.6 117 4.6 140 5.5 159 6.2 176 7.0 222 8.8
J A4AM 449 17.7 453 17.9 491 19.4 507 20.0 530 20.9 566 22.3
J A4AOM 472 18.6 476 18.8 514 20.3 530 20.9 553 21.8 589 23.2

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

Refrigerating Specialties Division 12
Fig. 14 M6191B-1006
PRESSURE CONTAINING COMPONENTS A4A DN LINE: 3/4" & 1"
COMPONENT DESCRIPTION MATERIAL Kv VOLUME
BODY, A4A DN ASTM A-126 CLASS B 6.2
ADAPTER, A4A DN ASTM A-126 CLASS B &
COVER BOTTOM, A4A/S4A BARSTOCK ASTM 1213 CR 8.6
BONNET A4W ASTM A-126 CLASS B
BODY,S6A (RE G ULAR M A TL) DUC TILE IRON ASTM A536
TUBE SOLENOID, S6 SS TUBING 304
SLEEVE, SOLENOID TUBE AISI 1117 CRS BARSTOCK
BODY, A2D DN ASTM A-126 CLASS B
PRESSURE CONTAINING COMPONENTS A4A DN LINE: 1-1/4 TO 4
COMPONENT DESCRIPTION MATERIAL Kv VOLUME
BODY, A4A DN DUCTILE IRON GGG 40.3 15 0.57 L
ADAPTER, A4A DN DUCTILE IRON GGG 40.3
COVER BOTTOM, A4A/S4A BARSTOCK ASTM 1213 CRS
BONNET A4W DUCTILE IRON GGG 40.6
COMPONENT DESCRIPTION MATERIAL Kv VOLUME
BODY, 2 A4A DN DUCTILE IRON GGG 40.3 28.6 1.61 L
ADAPTER, 2 A4A DN DUCTILE IRON GGG 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 DN DUCTILE IRON GGG 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, 2-1/2 A4A DN DUCTILE IRON GGG 40.3 60 3.19 L
ADAPTER, 3 A4A DN DUCTILE IRON GGG 40.3
COVER BOTTOM, 3 A4A/S4A DUCTILE IRON GGG 40.3
BONNET A4W DUCTILE IRON GGG 40.3
COMPONENT DESCRIPTION MATERIAL Kv VOLUME
BODY, 3 A4A DN DUCTILE IRON GGG 40.3 86 3.91 L
ADAPTER, 3 A4A DN DUCTILE IRON GGG 40.3
COVER BOTTOM, 3 A4A/S4A DUCTILE IRON GGG 40.4
BONNET A4W DUCTILE IRON GGG 40.3
COMPONENT DESCRIPTION MATERIAL Kv VOLUME
BODY, 4 A4A DN DUCTILE IRON GGG 40.3 116 6.5 L
ADAPTER, 4 A4A DN DUCTILE IRON GGG 40.3
COVER BOTTOM,4 A4A/S4A DUCTILE IRON GGG 40.4
BONNET A4W DUCTILE IRON GGG 40.3
75 MM
1-1/4 IN
1-5/8 IN
2 IN
2-1/2 IN
3/4 & 1IN
20 & 25
MM
100 MM
3 IN
4 IN
32 MM
40 MM
50 MM
65 MM