Viessmann VITOMAX 200-HS Operating And Service Instructions page 39

Commissioning
The length of the shutdown period also
determines the preservation measures
described in chapter "Preservation". A
short-term shutdown is not recommen-
ded, as every start-up process subjects
the boiler to additional stresses. For a
period of up to 24 hours or over a week-
end, the boiler should continue in oper-
ation. If pressure can be reduced via an
additional pressure regulator or via the
PLC, then the boiler can be operated
with reduced pressure (approx. 2 bar).
Only close the steam valve downstream
of the thermal water treatment (TWA)
outlet.
Note
For this ensure that the thermal water
treatment plant is not closed off by
damper valves, i.e. that it is not isolated
from the system pressure. Keep the ther-
mal water treatment plant – and the
boiler – under pressure during short
shutdown periods.
Steps to take the boiler out of use
■ Shut down combustion and close the
fuel valve
■ Feed the boiler up to the controlled
water level
■ Close the steam (see information
regarding the thermal water treatment
plant above) and feed valves
■ Switch off the circuit breaker
(cont.)
Commissioning
39