Checking The Filter Element In The Gas Line; Checking The Connections On The Gas Side For Tightness; Performing Final Checks; Checking The Water Quality - Viessmann VITOCROSSAL 200 CM2 Service Instructions For Contractors

Checking the gas train filter element
3. Reassemble the gas train in reverse order.

Checking the filter element in the gas line

If a filter element is fitted in the gas line, check the filter
element and replace if necessary.

Checking the connections on the gas side for tightness

Danger
Escaping gas leads to a risk of explosion.
Always carry out the following steps.
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into contact
with electrical contacts.
1. Insert new gaskets in all gas fittings that have been
opened and retighten them.

Performing final checks

1. Carry out final checks in accordance with the
points on pages 21 to 23.

Checking the water quality

Enter the amount of top-up water, the total hardness
and the pH value in the table in the appendix on
page 62.
For water quality requirements, see page 64.
The pH value should be between 8.2 and 9.5.

Checking the safety valve function

Checking the temperature controller setting if a building management system
is used (DCC system)
!
Please note
Shutting down from full load can result in high
material stress and material damage.
If a system with a higher ranking building man-
agement system takes over the temperature
control of the boiler, adjust the settings at the
temperature controller TR. Set the electronic
temperature controller to at least 10 K below the
mechanical temperature controller.
Commissioning, inspection, maintenance
(cont.)
4. Check for gas tightness. See page.
2. Open the gas shut-off valve.
3. Check the inlet joints of the gas train for tightness.
4. Start the burner (see page 15).
5. Check for tightness:
Outlet joints of the gas train
■
Joint between the fan and the boiler door
■
■ Joint between the fan and the Venturi pipe
2. Record the actual values in the report on
page 62.
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