TM 9-4940-342-14&P (3)  Loosen  scanner  cable  squeeze  connector at back of electrical control box. (4)  Remove front fire panel. (5)  Disconnect   scanner   from   scanner   sight tube. (6)  Remove scanner from unit. b.  Installation.   To   install   the   flame   scanner proceed as follows: (1)  Route     flame     scanner     cable     through squeeze connector at back of electrical control box. (2)  Connect scanner leads to terminals S1 and S2 of relay terminal board. (3)  Tighten squeeze connector around scanner cable. (4)  Connect scanner to sight tube on burner. (5)  Perform procedures in paragraph 5-43b. (6)  Replace front fire panel. 5-45.  Flame Safeguard Mounting Base (Refer to Fig C-13) a.  Removal.   To   remove   the   flame   safeguard mounting base proceed as follows: (1)  Accomplish   procedures   in   paragraph   5- 43a, steps (1) through (4). (2)  Disconnect   all   electrical   leads   to   flame relay   terminal   board.   Withdraw   leads   through knockouts in base. (3)  Remove  scanner  cable  squeeze  connector and jam nut from back of base. (4)  Remove   four   mounting   nuts   and   lock- washers from base. (5)  Remove base from box. b.  Installation.  To  install  the  flame  safeguard mounting base proceed as follows: (1)  Align base with mounting holes in box. (2)  Secure  base  with  four  mounting  screws, nuts and lockwashers. (3)  Install scanner cable squeeze connector in hole provided at back of base. Tighten in place with jam nut. (4)  Route    flame    scanner    electrical    leads through    knockouts    in    base.    Connect    leads    to terminal board. 5-46.  Fuse Holder (Refer to Fig C-13) a.  Removal. To remove the fuse holder proceed as follows: (1)  Remove electrical control box cover. (2)  Cut electrical leads at soldered connections of fuse holder. (3)  Remove  locknut  retaining  fuse  holder  in place. (4)  Remove fuse holder from box. b.  Installation.    To    install    the    fuse    holder proceed as follows: 42 (1)  Install  fuse  holder  in  hole  provided  in  side panel. (2)  Secure fuse holder with locknut. (3)  Strip  insulation  on  electrical  leads  to  fuse holder ¼-inch and solder to fuse holder terminals. (4)  Replace electrical control box cover. 5-47. Blowdown Pushbutton (Refer to Fig C-13) a.  Removal. To remove the blowdown pushbutton proceed as follows: (1)  Remove electrical control box cover. (2)  Disconnect   electrical   leads   at   pushbutton terminals. (3)  Remove   locknut   retaining   pushbutton   in place. (4)  Remove pushbutton from box. b.  Installation. To install the pushbutton accomplish procedures in paragraph 5-47a, steps (1) through (4) in reverse order. 5-48.  Magnetic Starter and Breaker Switch Assembly (Refer to Fig C-28) a.  Removal.  To  remove  the  magnetic  starter  and breaker switch assembly proceed as follows: (1)  Remove rear machinery access panel. (2)  Disconnect   power   cord   from   disconnect switch. (3)  Loosen   squeeze   connector   at   disconnect switch and remove power cord from switch. (4)  Disconnect  motor  power  leads  at  magnetic starter. (5)  Remove liquidtite connector from magnetic starter to motor at magnetic starter. (6)  Disconnect    control    transformer    primary leads at magnetic starter terminals L1 and L2. (7)  Disconnect   magnetic   coil   control   power conductors no. 2 and 11. (8)  Remove liquidtite connector from magnetic starter to electrical control box at magnetic starter. (9)  Remove  three  mounting  screws,  nuts  and lockwashers securing switch mounting plate assembly to soap and fuel tank mounting plate. (10)  Remove starter and breaker switch assembly from unit. b.  Installation.   To   install   magnetic   starter   and breaker switch assembly. (1)  Align  assembly  to  three  mounting  holes  in soap and fuel tank mounting plate. (2)  Secure   assembly   with   mounting   screws, nuts and lockwashers. (3)  Connect  liquidtite  connector  from  control box  to  magnetic  starter.  Secure  with  electrical  jam nut.