Mitsubishi Electric Ecodan HUS210FTC4ST Installation Manual page 56

Main Controller
26
Legionella Prevention Mode settings (LP mode)
During Legionella Prevention Mode the temperature of the stored water
is increased above 60°C to inhibit legionella bacterium growth. It is
strongly recommended that this is done at regular intervals. Please
check local regulations for the recommended frequency of heat ups.
1. Use button F3 to choose legionella mode active YES/NO.
2. Use button F4 to edit the legionella function.
3. Use F1 and F2 keys to scroll through the menu selecting
each subtitle in turn by pressing CONFIRM.
4. Enter the desired number using the function keys and
press CONFIRM.
Explanation of Legionella Prevention Mode operation
1. At the time entered by the installer 'Start time'
flow of useful heat from the system is diverted
to heat the water in the DHW tank.
2. When the temperature of the stored water
exceeds the 'Hot Water temp.' set by the
installer (above 65°C) primary circuit water
is no longer diverted to heat the DHW tank.
3. Whilst LP mode is in operation hot water is
not directed to the space heating circuit.
4. Directly after LP mode operation 'Duration
of max. temp' will operate. The duration of
this feature is set by the installer and during
its operation stored water temperature will
be monitored.
5. If stored water temperature should drop to LP
restart temp, LP mode will restart and primary
water flow from the heat source(s) will be directed
to the DHW tank to boost the temperature. Once the
set time for Duration of Max. temp has passed LP mode
will not recur for the set interval (set by installer).
6. It is the responsibility of the installer to ensure the settings for
Legionella Prevention are compliant with local and national guidelines.
FTC4 Installation Manual
56
(continued)