Help: How do I adjust the hot water temp in boiler?

[JOB6]

Recently had a large electric boiler installed but the hot water temperature is too low which the engineer set it at and I want to adjust the hot water temp higher but there isn't a switch on the boiler to adjust the heating for the hot water, radiators or a summer/winter mode. (The radiators have thermostats on them.)
My question is; "Would there be a hot water temp control in the boiler is there any way I can set it or should I call an engineer to open the boiler and adjust it. The highest temp the hot water goes to is 80c max and that's what I want to set it to, any advice would be great.
I have a gravity fed water system in my flat with high water pressure which supplies the whole building with water.

Specifications of boiler:

Primary Heating district:
Working Pressure 10 bar
Max Temp 90 c
Capacity 15kw
Temp 88/55c

Secondary Heating
WP:10 Bar
MAX T: 90 c
Cap:15 kw
Temp: 70/50c

Hot Water
WP: 10 Bar
Max Temp: 80c
Capacity: 50kw
Temp: 10/50c

 

[Elkato531]

Part of the handover should be setting up to customer requirements so call them back if your not satisfied. 80 degrees is, however, far too hot for your hot water from a safety point of view and to avoid excessive scale deposits.

 

[Steelmasons]

The unit you have is an HIU which is supplied via a central plant room.
I doubt whether the central plant will be operating @ a temperature of 80c