Cleaning The Sight Glass In The Boiler Door - Viessmann Vitoradial 300-T VR3 Service Instructions For Contractors

Commissioning, inspection, maintenance

Cleaning the sight glass in the boiler door

Fig. 10
Check the gaskets and hose connection for leaks.
Checking the mixer for ease of operation and tightness
1. Remove the motorised lever from the mixer han-
dle.
2. Check the mixer for ease of operation.
Checking the function of the return temperature raising facility (if
installed)
Checking the installation room ventilation
Checking the flue pipe and all connections from the heat exchanger to the
flue system for tightness
Restarting the system
18
3. Check the mixer for leaks. Replace the O-rings if
the mixer leaks.
4. Snap the motorised lever into place.