Hi Vilas, I don't recall seeing the line to close it when wing anti-ice is not in use. All I can find is a note at the end of Eng shut down in FCOM.
- If the ENG 1 FIRE pb-sw is pushed, APU bleed must not be used.
- If ENG 2 FIRE pb-sw is pushed, APU bleed may be used, provided the X BLEED rotary selector is set at SHUT.
The implication there seems to be that it is not automatically inhibited by pushing the Fire p/b.