Shutting Down The System; Preservation - Viessmann VITOMAX 200-HS Operating And Service Instructions

Functions
(cont.)
Sampling cooler rZ
Function
Removal of water samples to carry out
comparative tests

Shutting down the system

For short interruptions ≤ 3 days, maintain
the positive pressure in the boiler system
incl. all boiler-related drives (thermal
water treatment etc.). See also
page 38.

Preservation

The procedures listed in the following
should be considered as preservation
options. Further procedures with alter-
native chemicals should be agreed with
their manufacturer. The basis of these
instructions is the VdTÜV datasheet
TC1465 "Preserving the water side of
steam boilers" [Germany].
Operating information
Values to be checked in accordance with
country-specific regulations and to be
recorded in the boiler log
■ pH value
■ Residual hardness
■ p value (value to determine the free alka-
linity)
■ m value (value to determine the entire
alkalinity)
■ Phosphate
■ Sulphite
For longer interruptions, see chapter
"Preservation".
To prevent corrosion setting in during
idle periods when the boiler is not pres-
surised, preserve 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 preservation
during which exposure to oxygen is to be
avoided and dry preservation during
which moisture levels are to be mini-
mised.
Operating information
17