Shutdown - Viessmann Vitomax 200-HW Operating And Service Instructions

Operating information
Operational checks
Carry out the following checks
monthly:
& Check the function of the safety
valve.
& Check the function of all control and
safety equipment.
& Check all connections and closures
for leaks.
& Check the installation room ventila-
tion.

Shutdown

To prevent corrosion setting in during idle periods, when the boiler is not pres-
surised, conserve the boiler surfaces on the flue gas and water sides, subject to
the length of the period during which the boiler is taken out of use. There is a dif-
ferentiation between wet conservation (during which exposure to oxygen is to
be avoided) and dry conservation (during which moisture levels are to be mini-
mised).
Brief interruption of operation (1 to 2 days)
Water side
Recommendation: Maintain the boiler
pressure and temperature. Where that
is not possible and the boiler should
be depressurised for several days, we
would recommend the following:
Flue gas side
Keep the heating surfaces dry.
Remove severe contamination as it
binds moisture.
6
(cont.)
Have someone carry out the following
checks every six months (in accor-
dance with TRD 602 and 604):
& Check the safety equipment.
& Check the burner.
& Check the thermal insulation on the
hot gas side, i.e. on lids and doors.
Record the results of the daily,
monthly and biannual checks in a log.
To prevent oxygen corrosion, add an
oxygen binder with twice to three
times the standard dose to the feed-
water from approx. one hour before
the boiler is shut down.