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Direct Support Troubleshooting Guide (Continued) . - TM-10-4610-232-34_71
Direct Support Troubleshooting Guide (Continued) - TM-10-4610-232-34_73

TM-10-4610-232-34 Water Purification Unit Reverse Osmosis 3 000 GPH Trailer Mounted Flatbed Cargo 22-1/2 Ton 8 Wheel Tandem Model No. WTA-060 Manual
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TM 10-4610-232-34 Table  2-1.  Direct  Support  Troubleshooting  Guide  (Continued) MALFUNCTION TEST  OR  INSPECTION CORRECTIVE   ACTION (b) Repair starter MS8-1M if its contact is closed with the pluinger out or if it is open when the plunger is depressed (para. 2-25). (c)  Return  the  ROWPU  to  service  and  check  phase  1  of  the  backwash  cycle. Step 9. Open the media filter top drain valve and watch that the media filter pressure drops below 5 psig. Check that the  indicating  plunger  on  relay  K15  is  out. If  the  plunger  on  K15  is  in,  refer  to  feed  low  pressure  switch  troubleshooting. Step 10. Watch the level assembly on the media filter. It should turn white as the water level drops in the media filter. Relay  K10S  (REF:  Interconnection  diagram  FO-2,  Sheet  6)  indicating  plunger  should  go  in  when  the  white flags reach the bottom switch on the level assembly. Relay K11 should pull in shortly after K10 pulls in. (The time  delay  between  K10  and  K11  is  dependent  on  how  much  pressure  is  in  the  filter.  If  PSL8  (REF: Interconnection  diagram  FO-2,  Sheet  14)  is  still  sensing  pressure,  it  will  keep  K11  de-energized  until  the pressure  drops  low  enough  to  allow  the  switch  to  close.) (a)  If  the  flags  do  not  turn  white  on  the  level  assembly  and  water  has  stopped  draining  from  the  media filter  top  drain,  refer  to  media  filter  level  assembly  plugged  troubleshooting  in  TM  10-4610-232-12. (b)  If  K10  does  not  pull  in  and  the  water  level  has  reached  the  bottom  switch  on  the  level  assembly (actuation  point  is  midway  through  the  switch),  go  to  step  11. (c) If K10 pulls in but K11 does not, go to step 18. Step 11. Shut down ROWPU and generator. Refer to electrical drawings in Appendix D. Disconnect connector at the bottom  switch  of  the  media  level  assembly.  Check  continuity  across  J35A  (REF:  Interconnection  diagram FO-2, Sheet 15) and J35B. If there is continuity, go to step 14. NOTE Be careful when removing the float. It will drop out when the cover is removed from the level assembly. Step 12. Remove the bottom of the level assembly and remove the float. Check for continuity across J35A and J35B with  the  float  removed. (a)  If  there  is  continuity,  the  float  is  not  dropping  far  enough  to  actuate  the  switch.  Clean  out  anything plugging the lines to the level assembly and clean out the level chamber. (b)  If  there  is  nothing  plugging  the  lines  or  chamber,  it  is  possible  that  the  switch  is  loose  and  slipped slightly  out  of  position,  Move  it  up  the  chamber  a  little  and  go  to  step  13.  Do  not  tighten  the  switch clamp  too  tight,  it  will  crack  from  overtightening. Step  13.  Check  that  J35A  and  J35B  show  continuity  and  insert  the  float  into  the  level  chamber  with  the  arrow  up. Slowly push it up the chamber and watch the multimeter. It should show the switch opening as the float goes past it and stay open. Slowly let the float drop and watch that the switch closes as the float goes by it. It should then stay closed. (a)  If  the  switch  (LSLL)  (REF:  Interconnection  diagram  FO-2,  Sheet  15)  does  not  operate  as  described, replace it (para. 4-52 of TM 10-4610232-1 2). (b)  Return  the  ROWPU  to  operation  and  check  phase  1  operation. Step  14.  Reconnect  J35  and  remove  P16  (REF:  Interconnection  diagram  FO-2,  Sheet  15)  from  the  control  panel. Check  for  continuity  across  P16T  and  P16U. If there is no continuity, replace/repair the cable and connectors between the panel and the LLSL switch (para. 2-18). Step  15.  Check  continuity,  point-to-point,  from  LK1  (SW2)  (REF:  interconnection  diagram  FO-2,  Sheet  6)  to  J16T. Repeat the procedure from LK1 (SW1) to J16U. (a)  Repair  any  loose  or  damaged  wire  (para.  2-20). (b)  Replace/repair  connector  J16  if  faulty  (para.  2-21). Step  16.  Remove  wire  #2A  from  K10.  Check  continuity,  point-to-point,  from  CB9  (wire  #264)  to  LK1(AC)  and  from LK1(LOAD)  to  relay  K10(K1).  Check  continuity,  point-to-point,  from  transformer  T1(X2)  (REF:  Interconnec- tion diagram FO-2, Sheet 10) to relay K10 (wire #2A). Repair any loose or damaged wire (para. 2-20). Change 1 2-51







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