50RB

50RB
Instruction Sheet
PA-00264
January 2008
50RB Solenoid Valves
50RB Solenoid Valves
GENERAL INFORMATION
Emerson 50RB series solenoid valves are two-way direct
acting, normally closed solenoid valves. For liquid and hot
gas applications only.
UL File No.: MH25894
Guide No.: Y10Z
MWP: 600 psig MOPD: 300 psi
Minimum pressure rating: Less than 1 psi
Fluid temperature range: -20 to +250°F
For applications not cataloged, consult Emerson Climate
Technologies Flow Controls Division Applications Engineering Department.
SAFETY INSTRUCTIONS
1. Read all instructions thoroughly. Failure to comply
can result in valve failure, system damage, or
personal injury.
2. To be used only on Refrigerant 134a, 22, 404A and
507. For applications or fluid media not specifically
cataloged, consult the Emerson Climate Technologies Flow Controls Division Applications Engineering
Department.
3. Do not use a solenoid valve as a safety shut-off
valve.
4. WARNING If a hand valve is installed ahead of a
solenoid valve, it should be opened as soon as the
service is complete. If both the solenoid valve and
hand valve were closed, trapping liquid between the
two can cause dangerous hydrostatic pressure,
resulting in personal injury.
5. Do not use a solenoid valve on any system where the
system pressure can exceed the maximum working
pressure (MWP) of the valve.
6. The solenoid coil should be fused in accordance with
local codes. Electrically ground the valve body.
7. Do not use with ammonia or on hazardous or
corrosive fluids.
8. Do not install in Hazardous Locations.
Do not use a solenoid valve as a safety shut-off valve
when making repairs to a system.
DISCONNECT ELECTRICAL POWER SOURCE, SHUT
OFF FLUID POWER SOURCE AND DEPRESSURIZE
VALVE.
INSTALLATION INSTRUCTIONS
Solder Connections
Arrow on valve body must point in direction of flow.
Failure to follow brazing instructions may result in body
warping or external leakage of refrigerant. Allow body and
line connections to cool sufficiently to avoid damage to
synthetic materials.
Use chill blocks or wrap wet cloths around valve body
during brazing to prevent overheating. The tip of the torch
should be large enough to avoid prolonged heating of the
connections.
DIRECT FLAME AWAY FROM VALVE BODY.
The use of soft solders is not recommended.
On valves with brass ODF connections, use an alloy
whose flow point is above 800°F.
Do not dent, bend, or use the enclosing tube as a lever. A
damaged enclosing tube may result in coil burnout or
inoperative leads. This could damage the coil and cause a
coil burnout. Before energizing valve, be sure that the
source voltage and frequency matches that on the coil
label. Do not energize coil unless coil is attached to valve.
See Installation Instructions.
COIL INSTALLATION
Before removing coil from valve, disconnect electrical
power source. Failure to do so will cause coil to
burnout.
1. Place coil over the enclosing tube. Coil may be
rotated 360° for ease of wiring. It is recommended
that coil lead connections be soldered on 24V A.C
applications.
2. Press coil housing down firmly and secure coil
housing by screwing retaining bolt to 20 inch lbs.
BEFORE INSTALLATION
Read installation and safety instructions thoroughly.
Retain for future reference.
Verify coil type, voltage and frequency to system electrical
power source. The coil information appears on the coil
label. Valves may be mounted horizontal, on side or in a
vertical line. Allow adequate clearance above valve for
removal of coil. Direction of flow must match arrow on
body.
Proper valve sizing is important. An oversize valve may
result in hammering or chattering. An undersize valve may
considerably reduce system capacity. Do not attempt to
install a valve before pumping the system down to
atmospheric pressure. Make absolutely certain that the
pressure in the lines is at atmospheric pressure before
removing any valve parts.
www.emersonclimate.com/flowcontrols
11911 Adie Road P.O. Box 411400 St. Louis MO 63141 USA
CUSTOMER SERVICE (314) 569-4666
VALVE NOMENCLATURE: example 50RB 4T22
50R
Basic Valve
Type
B
Design
Series
4
Port Size
(In 1/64")
T
Connection Type
T=ODF straight thru
B=ODF right angle
2
Inlet
Connection Size
(In 1/8")
50RB
DIMENSIONAL DIAGRAMS
1.54
3.35
1.50
REQUIRED FOR
COIL REMOVAL
2.72
4.43
FLOW
2.68
50RB4B22
SHOWN WITH "SML" COIL
1.50
REQUIRED FOR
COIL REMOVAL
1.54
2.00
FLOW
30" LEAD
WIRE
5.50
.50
STRIPPED
50RB4T22
SHOWN WITH "SML" COIL
2
Outlet
Connection Size
(In 1/8")
TROUBLESHOOTING GUIDE
Symptom
Valve
Will Not
Open
Valve
Will Not
Close
Cause
Movement of plunger (armature) or
diaphragm restricted
a) Corroded parts
b) Foreign material lodged in valve
c) Dented or bent enclosing tube
d) Warped or distorted body to:
1. Improper brazing
2. Crushing in vise.
Remedy
Replace valve.
Coil burnout.
See instructions below dealing with coil burnout.
Improper wiring
Check electrical circuit for loose or broken
connections. Attach voltmeter and/or ammeter to coil
leads and check voltage, inrush and holding currents.
Faulty contacts on relays or thermostats.
Check contacts in relays and thermostats. Clean or
replace as required.
Voltage & frequency rating of solenoid coil
not matched to electrical supply:
a) Low voltage
b) High voltage
c) Incorrect frequency.
Check voltage & frequency stamped on coil assembly
to make certain it matches electrical source. If it does
not, obtain new coil assembly with proper voltage &
frequency rating.
a) Locate cause of voltage drop and correct. Install
proper transformer, wire size as needed. Be sure
all connections are tight and that relays function
properly.
b) Excessively high voltage will cause coil burnout.
Obtain new coil assembly with proper voltage
rating.
c) Obtain new coil assembly with proper frequency
rating.
Operating pressure differential higher than
valve MOPD rating.
Reduce pressure differential to less than 300 psi.
Electrical feedback keeping coil energized,
or switch contacts not breaking circuit to
solenoid coil.
Attach voltmeter at coil leads and check for
feedback or closed circuit. Correct faulty contacts
or wiring.
Reverse pressures (outlet pressure greater
than inlet pressure), or valve installed backwards.
Install check valve at valve outlet, or install with flow
arrow in proper direction.
TROUBLESHOOTING GUIDE
Symptom
Valve Closed,
But Flow
Continues
(Seat
Leakage)
Cause
Valve seat damaged.
Remedy
Replace valve.
Synthetic seat material chipped.
Replace valve.
Valve improperly applied or assembled.
Replace with proper valve or assemble correctly.
Coil Burnout
Supply voltage at coil too low (below 85% of rated
coil voltage)
Locate cause of low voltage and correct (check
transformer, wire size, and control rating).
Supply voltage at valve too high (more than 10%
above coil voltage rating).
Locate cause of high voltage and correct (install
proper transformer or service).
Valve located at high ambient.
Ventilate or isolate the area from high ambient.
Remove covering or insulation from coil housing.
Diaphragm or plunger (armature) restricted due
to: corroded parts, foreign material lodged in the
valve, dented or bent enclosing tube, or warped
or distorted body due to — improper brazing or
crushing in vise.
Correct cause of corrosion or source of foreign
material in the system. Replace valve.
With valve closed, pressure difference across
valve is too high — preventing valve from opening.
Reduce pressure differential to less than 300 psi.
Improper wiring:
Inrush voltage drop causing the plunger to fail to
pull into magnetic field due to:
– Wiring the valve to the load side of motor
starter.
- Wiring the valve in parallel with another
appliance with high inrush current draw.
- Poor connections, especially on low voltage,
where connections should be soldered.
Wire size of electrical supply too small.
Correct wiring according to valve manufacturers
instructions. Solder all low voltage connections.
Use correct wire size.
Electrical supply (voltage & frequency)
not matched to solenoid coil rating.
Check coil voltage & frequency rating to be sure it is
rating for the electrical service supplied. Install a
new coil with the proper voltage & frequency rating.
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