Viessmann Vitomax HS M73 Operating And Service Instructions page 12

Functions
Description of selected components in a steam...
Blow-down and
wT wZ
Function: Periodic removal of deposits from the boiler
Operation
Regular automatic blow-down via au-
tomated programs
Observe country-specific regulations
concerning regular manual blow-
down.
Tab. 7
Danger
A lever that kicks back may cause injury.
Do not release the lever.
TDS unit and
wU wI
Function
■ Continual checking and regulation of the salt content
through temperature-compensated conductivity elec-
trode
Desalination via TDS valve
■
Valve operates within specified limits
■
Operation
Conductivity Falling
Exceeds the set value
Exceeds the highest value
Tab. 8
Water level indicator
Function: Visual and direct water level indication
Operation
Visual water level check
When there are no operating personnel present
12
Operating information
Program switch opens the blow-down valve via the control valve. Briefly
drain off the boiler water. The resulting suction removes the sludge from
the steam boiler. Manual activation possible at any time.
Push the locking lever of the blow-down valve to the side.
Push down on the activating lever of the blow-down valve for 2 to 3 sec-
onds.
rP
(cont.)
Operating condition
Flow rate is reduced.
Valve is opened further.
Safety chain is interrupted.
Burner operation is interrupted.
Operating information
Valve on the steam and water side: Shut-off device is
"OPEN"
Flushing valve: Shut-off device is "CLOSED"
Keep valves "CLOSED"