Firebird combi 90 air pressure switch

[Inverness]

hi guys, I've been asked to fit a second hand boiler to a caravan until there new house is built.

It's a firebird combi 90. I had a glance over it but it looks like the air pressure switch is all taped up?. Any reason why? I don't know the history to why it would be.
Any one shone light I would be grateful.
Regards dars

 

[Vee]

Do you have a picture?

 

[Chalked]

Firebird is an oil combi. So won’t have an air pressure switch.