page 3-704 TM 5-3895-374-24-2 RCA 3D Model RCA3V10 RCA6V383 INSTALLATION and SERVICE INSTRUCTIONS DESCRIPTION The  model  RCA3D  is  a  single  solenoid  valve  assembly with either AP coil (24" leads), Q coil (1/4”  spades), or QT  coil  (screw  terminals),  and  the  model  RCA  6V3_3 and  RCA3V_  are  Nema  4  aluminum  enclosures  with integral  solenoid  valves.    The  number  stamped  in  the position indicated by_ in the model number indicates the number of valves in the assembly.  All coils have screw terminals    for    one    step    electrical    connections    The enclosures  have  two,  314"  tapped  conduit  connections. Each solenois valve  has  a  118"  FNPT  Inlet  connection, 1/8"  FNPT  inlet  connection,  1/8"  orifice,  rated  110  PSI and exhausts to atmosphere. OPERATION Each valve opens when voltage is applied to the coil and the resultant magnetic field attracts the 430 SS  plunger with   integral   disc   off   the   seat.      In   the   deenergized position the plunger is held on the seat by a spring and the system pressure assists in seating.  The only moving parts are the plunger and spring.  To manually override the  valve,  simply  insert  a  rod,  diameter  of  a  paper  clip, into the outlet and push. INSTALLATION The  ideal  mounting  arrangement  is  to  have  the  coils  in the vertical and upright position.  This position shields the outlet,  preventing  rain  or  other  foreign  substances  from settling  therein.    Screw  terminals  in  the  coil  provide  for one step electrical connections. SERVICE The valve requires no periodic service.    Should  a  valve malfunction the cause Is usually dirt from the system.  A kit, M1131.  Is available to restore a worn valve to a new condition. VALVE WILL NOT OPEN: Step 1. Confirm adequate electrical service. Step 2. Remove cover on Nenma4assemblies Step 3. Coil-check continuity, or, I metallic click is heard when coil Is energized, the coil is not the source of the problem. Step 4. Depressurize the system. Step 5. Remove body for access  to plunger, spring and orifice. Check orifice to be sure it is not blocked or  for  other  foreign  objects  that  may  prohibit operation. Step 6. If dirt was problem clean and reassemble. Step 7. If   plunger   is   excessively   worn,   to   where   It lodged  In the  ferrule  assembly,  rebuild valve with kit M1131. VALVE WILL NOT CLOSE: Step 1. Disconnect the electrical signal to be sure coil is not continuously energized. Step 2. Depressurize the system. Step 3. Remove body for access to plunger, spring and orifice,  check  for  dirt  In  valve  preventing  disc from sealing on seat. Step 4. If dirt was  the  problem  clean  and reassemble. Step 5. If disc Is excessively worn to where It will not seal on the seat or plunger is Jammed In enclosing  tube  because  of excessive wear, rebuild valve with kit, M1131.* *To restore a vale to a new condition, all Parts Included In the kit should be changed.