Air-water heat pump with enclosure, yes or no

I have the following problem: We want to build a KfW house with an air heat pump. Now the builder says the air heat pump cannot be installed because the development plan states that an enclosure is required for the air heat pump. Are there air heat pumps that must not be placed in enclosures? Should the builder have pointed this out to me?
That's all for now... hope to get some answers here.

And why don't you just build an enclosure? If the development plan says so, then it doesn't matter what is available on the market, there just has to be an enclosure..

Because the architect said it is not possible to build an enclosure around the air heat pump. That was my question whether there are air heat pumps that are not allowed to be placed in enclosures. Or is it generally the case that any air heat pump, regardless of the manufacturer, can be placed in an enclosure?

It is a Thermia iTec air heat pump.

I don't know the air heat pump, but if your architect thinks it won't work with it (just call the manufacturer and ask), then just take another one that works... Where exactly is the problem?

Better no enclosure

Oh God! Air heat pumps are basically built without enclosures, without further description, it is related to the flow-through. The development plan cannot prohibit technical necessities -> discussion with the district/municipality. Otherwise, the system should be installed according to the manufacturer's specifications, as only then is there a guarantee for trouble-free operation.