I also tried with this code:
! Convection in the hot surface
SF,hot,CONV,5500,1000
! Convection in the sides
SF,sides,CONV,1000,800
! Convection in the impingement pocket
SF,impingement,CONV,4600,800
! Convection in the tubes
SF,tubes,CONV,4200,800
! Temperature distribution in the hot area...