Viessmann Vitomax HS M73 Operating And Service Instructions page 10

Functions
Description of selected components in a steam boiler system
Detailed information
Manufacturer's documents for the individual
components
Level electrodes to
qP
Permanently modulating water level control
Level electrode for continual and load-dependent
steam boiler filling
Function
Continual water level control comprising:
Level electrode
■
Level controller
■
Continual control of the boiler water level via a
feedwater control valve or variable speed pump
Tab. 1
Maximum water level (HW electrode
Level electrode to safeguard against overfilling
Function Operating condition
Self-monitoring overfill Standard
protection comprising: water level
Level electrode
■
Evaluation device
■
High
water level
The level drops again
Tab. 2
Additional HW electrode for up to 72 h operation
without continuous supervision according to
TRD 604
According to EN 12953-6, for a system with up to 72 h
operation without continuous supervision, this function
can also be performed by level electrode
10
qW
qP
Operation
Water level differs from set
value.
)
qQ
Operating information
Electrode is not immersed in conducting boiler water.
Feedwater pump operation enabled.
Feedwater pump operates.
The filling of the steam boiler is continual and load-dependent.
Electrode is immersed in conducting boiler water. Registers a
high resistance.
The feedwater pump is shut down via the pump relay.
Feedwater supply to the steam boiler interrupted.
Feedwater pump starts automatically, dependent on demand.
.
qP
Operating information
The controller issues pulse to
feedwater control valve or varia-
ble speed pump.
The filling of the steam boiler is
continual and load-dependent.
Note
Observe country-specific regulations.