TM 9-4940-342-14&P 10     Change 1 a. Close  all  service  valves  (fig  2-1,  indexes  7,  9, 14, 17, 22, 31, 32, 33 and 38). b. Be  sure  switches  (fig  2-1,  indexes  1,  3  and  4) are OFF. c. Set   electrical   disconnect   switch   (20)   to   ON (lever up), check that motor reset switch (21) has been reset if required. d. Set  selector  valve  (8)  to  low  volume  position (lever horizontal) that provides 300 GPH. e. Open  shut-off  valve  (17)  if  using  water  under pressure as source, or open auxiliary water valve (22) if using standing water not under pressure. f. Open one of the discharge valves (32). g. Open  on-fuel-off  valve  (33)  and  strainer  valve (39). h. Turn on pump control switch (4), allow water to run out of cleaning nozzle for a minimum of 6 minutes. i. Secure cleaning nozzle to prevent whipping. j. Turn on low burner switch (1).  Cleaner should start, providing 300 GPH of solution. NOTE If starting after a flame failure, an automatic seven-second purge period is required.  If burner starts and then shuts down, and the indicator light (2) is on, then this indicates a flame failure lockout. Reset burner reset switch (25). WARNING If while operating this equipment, a flameout occurs, fault isolate the problem prior to trying a restart.  Under no conditions should this  machine  be  tried  to  start  more  than  twice.  If  excess  fuel  is present,  the  burner  assembly  must  be  removed  and  excess  fuel evacuated.    The  disposal  of  excess  fuel  and  absorbent  material must  be  in  accordance  with  your  local  safety  office,  EPA,  state, and local OSHA rules and regulations.  Do not . . . repeat  . . . do not try and start this equipment more than twice as an explosion could occur. k. Open soap control valve (7), wait a few minutes until  soap  appears  at  cleaning  nozzle,  and  adjust  to desired  mixture.    Approximately  ¼  to  ½  turn  open  is recommended  starting  point.    Adjust  counterclockwise to increase concentration. NOTE Refer   to   paragraph   2-9   for   instructions   on   how   to   add   soap solution.  The soap concentration can be varied as follows: Minimum (5% concentration) two lbs soap to five gallons water. Minimum (10% concentration) four lbs soap to five gallons water. Each mark (hole) on soap tank gage is equivalent to 1½ gallons. l. If   more   volume   is   required,   move   lever   of selector  valve  (8)  to  HIGH  position  (vertical)  and  turn on high burner switch (3).  This provides 600 GPH. WARNING Due  to  extreme  pressure  velocity  at  600  GPH  two  operators  are recommended    to    be    present    during    600    GPH    operating procedures. NOTE Low burner switch (1) remains on. m.   If one cleaner gun is to be used, the unit may be operated  in  either  the  HIGH  (600  GPH)  (with  a  5/16- inch  nozzle)  or  LOW  (300  GPH)  (with  a  no.  1  drill nozzle)  position.  When  using  two  cleaning  guns  the HIGH position should be used per paragraph 2-11. n. Adjust  temperature  and  pressure  control  valve (34)   for   either   Vapor   or   Rinse.      For   vapor   set   at approximately 325° and lower temperature for hot water rinse. 2-9.  Adding Soap Solution a. Accomplish steps a through i of paragraph 2-8. b. Open soap fill and stir valve (9), close discharge valves (32). c. Fill  tank  at  soap  fill  port  (35)  until  tank  is  2/3 full (or 2/3 of remaining capacity, if adding to partially full tank) with water. d. Turn off pump control switch (4), close soap fill and stir valve (9) and open discharge valves (32). e. Turn on low burner switch (1).  Cleaner should start providing 300 GPH. f. While    cleaner    is    coming    up    to    operating temperature and pressure, add required quantity of soap solution. (1) Minimum (5% concentration) two lbs soap to five gallons water. (2) Minimum   (10%   concentration)   four   lbs soap to five gallons water. (3) Each  mark  (hole)  on  soap  tank  gage  is equivalent to 1½ gallons. g. When  cleaner  is  up  to  pressure  (steam),  repeat step  b of this paragraph and allow hot discharge water to fill and stir (mix) compound. h. When   solution   tank   is   full,   open   discharge valves (32) and close soap fill and stir valve (9). i. Cleaner   is   now   ready   for   normal   operation. Refer to appropriate instructions. 2-10.  Stopping (Refer to Fig 2-1) a. Secure cleaning nozzle to avoid whipping. b. Turn off low burner switch (1) and high burner switch  (3)  and  allow  unit  to  run  until  temperature  on temperature gage (10) indicates 100° F or less. c. Turn off pump control switch (4). d. Turn off soap control valve (7). NOTE Unit is now ready for restart.  If not going to be used in less than a half-hour, close all valves (8, 9, 14, 22, 32 and 33) and turn off disconnect switch (20) (lever down). 2-11.  Operation of Equipment a. There are five different modes of operation for the  steam  cleaner,  300  GPH  per  each  gun,  one  or  two guns  with  steam  vapor,  600  GPH  one  gun  with  steam vapor, and hot or cold rinse.  The instructions for each of these follows.