Low Energy Tariff; Anti-Legionellosis - Mitsubishi Electric i-BX-N Technical Manual

Table of Contents

TM_i-BX(-N)_NC05_00_06_20_EN

5.3

LOW ENERGY TARIFF

This function can be activated from the digital input (command normally given by the electricity meter) and forces the loading of the DHW storage

tank during time bands when the electricity tariff is reduced. When the contact is active, the DHW setpoint is forced to the "comfort setpoint (parameter

0023) even if the setpoint set by the user would impose "economy setpoint" based operation (parameter 0022).

For the default values of the various parameters, see the parameters table

5.4

ANTI-LEGIONELLOSIS

The purpose of this function is to treat the water contained in the DHW storage tank, heating it to a certain temperature and for a period that can be

set from the parameter, in order to eliminate any Legionellosis bacteria. The function (enabled using parameter 0222) requires the definition of a

setpoint (parameter 0211) which must be reached within a certain time, starting from a settable time (parameter 0221) and which must be maintained

until disinfection has been completed.

It is possible to select two types of anti-legionellosis programmes (parameter 0212):

•

Fixed days: the anti-legionellosis function can be performed on selected days (parameters 0213 to 0220; Monday to Sunday);

•

Periodic: the anti-legionellosis function can be performed at intervals from 1 to 30 days (parameter 0217). The first day to be counted for

the anti-legionellosis period will be Sunday.

The following chart indicates the time required to complete disinfection according to the temperature. If the water temperature does not exceed 60°C,

counting does not begin. When, instead, the water temperature falls below 55°C, the anti-legionellosis time is reset to ensure the bacteria do not

return.

After completing the anti-legionellosis cycle following a request, Service instruction, or weekly program, or for any other reasons for which the storage

tank temperature allows its completion, the function will be disabled for 24 hours.

Two settable thresholds are used:

•

Cycle threshold for alarm with "Anti-legionellosis not completed" message. If after n. cycles (parameter 0224) the anti-legionellosis cycle

has not yet been completed, an alarm will be generated, which will be automatically reset upon completion of the disinfection cycle.

•

Time threshold for the completion of the anti-legionellosis cycle: if for some reason the unit is unable to complete the anti-legionellosis

cycle within this time (parameter 0225 in minutes), the function will be disabled until the next request.

Based on the resources available, it is possible to select (parameter 0223) one of the following options for the completion of the anti-legionellosis

cycle:

•

Heat pump only