Viessmann Vitomax 200-LW M64A, Инструкция по эксплуатации и обслуживанию

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8
Longer interruptions of operation
Water side
Wet preservation if no risk of frost
*1
exists
1. Fill the boiler up to the highest possi-
ble level with treated feedwater. To
prevent oxygen corrosion, add an
oxygen binder to the boiler water (e.g.
sodium sulphite) in accordance with
the manufacturer's instructions. Test
the oxygen binder concentration at
least monthly and top up if required.
For this, ensure a good admixing with
the boiler water (thermal or mechani-
cal agitation).
2. In multi boiler systems if only some
boilers must be preserved, these can
be filled with desalinated boiler water
from the boilers that remain in use.
This will also maintain the tempera-
ture.
3. Maintaining pressure in a fully filled
boiler using nitrogen (preferably nitro-
gen 5.0) of 0.1 to 0.2 bar can prevent
corrosion.
Dry preservation if there is a risk of
frost
*1 or prolonged idle period
Drain the boiler at 90 °C and then open
the water connections.
Dry the boiler thoroughly and fill with
dessicant (e.g. silica gel) in accordance
with the manufacturer's details.
Ensure that the dessicant does not come
into contact with the boiler material. Then
close the boiler again. Check in regular
intervals whether the dessicant is still
able to absorb moisture.
Flue gas side
Thoroughly clean and dry the surfaces
on the flue gas side.
Maintain the alkaline balance of the
wash water (pH 8-9, in the case of
ammonia pH 10).
After thoroughly drying the surfaces, pre-
serve them with a thin film of graphite or
varnish.
Keep the surfaces dry during the idle
periods (by adding a dessicant such as
silica gel or by air circulation via a con-
nected dryer).
Further details
For further details, see the operating
instructions for preservation on the water
and hot gas side or the VdTÜV data-
sheets (no. 1465, Oct. 1978) and the
VGB (no. R116H, 1981) [or local regula-
tions].
*1 See chapter "Using antifreeze in boilers"
Operating information
Shutdown
(cont.)
5727 529 GB