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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