Checking All Connections On The Heating Water Side For Leaks; Closing The Boiler Door; Checking Gas Connections For Tightness - Viessmann Vitocrossal 300 Service Instructions For Contractors

Checking all connections on the heating water side for leaks

Danger
There is a risk of injury when working on pres-
surised components.
The connections on the heating water side must
only be opened after the boiler has been dep-
ressurised.
Only drain the boiler with a suction pump when
the boiler air vent valve is open.

Closing the boiler door

18 Nm
Fig. 8
Danger
Leaks can result in a risk of poisoning through
escaping gas.
Before commissioning
■ Clean the sealing faces.
■ Check gaskets for damage and replace if
required.
Check the boiler door gasket is seated cor-
■
rectly and realign the boiler door if necessary.
Checking the filter element in the gas line (if installed); replacing if
necessary

Checking gas connections for tightness

Danger
Escaping gas leads to a risk of explosion.
Always carry out the following steps.
2.
1.
Commissioning, inspection, maintenance
Note
Also check the connections for the control equipment
and the minimum pressure switch (low water indicator)
for tightness.
1. Insert new gaskets in all gas fittings that have been
opened and retighten them.
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