3
Operating principle
BMS
MODBUS
Application diagram
COLD
HOT
MIXTURE
At the inlets the mixing valve has the hot water from the storage and
the cold water from the water mains. At the outlet there is the flow
mixed water. By means of a specific probe, the regulator measures
the temperature of the mixed water at the valve outlet and actuates
an obturator in order to maintain the setting. Temperature fluctuations
caused by flow rate or pressure variations are compensated by the
thermostat in the valve. The appliance has a built-in digital clock,
which can be used to set anti-legionella programs to disinfect
the water system and to manage a recirculation pump. The
system is disinfected by raising the water temperature to a specific
value for a set time duration. For the best thermal disinfection
control, in this type of system it may also be necessary to measure
the temperature of the water returning from the distribution network,
using the recirculation probe. When this measurement is available,
it is used to check and control the temperature reached over all
or part of the network, since the probe may be located at a significant
remote point of the system. The appliance is equipped with RS-485
interface (optional), with MODBUS protocol, for readouts and
remote setting. To use the device, it is necessary to configure the
MODBUS system with the addresses of the registers used by the
device (PC software is available).
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