Mitsubishi Electric PAC-IF062B-E - Domestic Hot Water DHW Legionella Prevention

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7. Main remote controller operation
DHWtanktemp.
DHW max.
temp.
DHW max.
temp. drop
Start
DHW max.
operation time
DHW mode
restriction
DHW mode
Time
Stop
Stop
Restart
DHW max.
temp.
DHW max.
temp. drop
DHWtanktemp.
Stop
Start
Restart
Time
DHW mode DHW mode
DomesticHotWater(DHW)/LegionellaPrevention
The domestic hot water and legionella prevention menus control the operation of
DHW tank heat ups.
<DHWmodesettings>
1. Highlight the hot water icon and press CONFIRM.
2. Use button F1 to switch between Normal and ECO heating modes.
3.
To edit the mode, press down the MENU button for 3 secs, then select “hot water”.
4. Press F2 key to display the HOTWATER (DHW) SETTING menu.
5. Use F2 and F3 keys to scroll through the menu selecting each component in
turn by pressing CONFIRM. See the table below for description of each setting.
6. Enter the desired number using the function keys and press CONFIRM.
Menu subtitle Function Range Unit Defaultvalue
DHW max. temp. Desired temperature of stored hot water 40 - 60 °C 50
DHW max. temperature
drop
Difference in temperature between DHW max. temp. and the temperature at which DHW mode restarts 5 - 30 °C 10
DHW max. operation time Max. time allowed for stored water heating DHW mode 30 - 120 min 60
DHW mode restriction The time period after DHW mode when space heating has priority over DHW mode temporarily pre-
venting further stored water heating
(Only when DHW max. operation time has passed.)
30 - 120 min 30
If you wish to make changes contact installer.
ExplanationofDHWoperation
• When the DHW tank temperature drops from “DHW max. temp.” by more than the
“DHW max. temperature drop” (set by installer), DHW mode operates and the
ow from the primary heating/cooling circuit is diverted to heat the water in the
DHW tank.
• When the temperature of the stored water reaches the ‘DHW max. temp.’ set by
the installer or if the ‘DHW max. operation time’ set by the installer is exceeded
DHW mode ceases to operate.
• Whilst DHW mode is in operation primary hot water is not directed to the space
heating/cooling circuit.
• Directly after DHW max. operation time ‘DHW mode restriction’ will routinely op-
erate. The duration of this feature is set by the installer and during its operation,
DHW mode can not (normally) be reactivated, allowing time for the system to
deliver primary hot water to the space heating/cooling if required. However, if at
this time there is no current demand for space heating/cooling, the system will
automatically resume DHW mode. This will continue until it receives a demand
for space heating.
• After the ‘DHW mode restriction’ operation the DHW mode can operate again and
DHW tank heating will continue according to system demand.
<Eco mode>
DHW mode can run in either ‘Normal’ or ‘Eco’ mode. Normal mode will heat the
water in the DHW tank more quickly using the full power of the heat pump. Eco
mode takes a little longer to heat the water in the DHW tank but the energy used is
reduced. This is because heat pump operation is restricted using signals from the
FTC based on measured DHW tank temperature.
Note: The actual energy saved in Eco mode will vary according to outdoor
ambient temperature.
Return to the DHW/legionella prevention menu.
Legionella Prevention Mode settings (LP mode)
1. Use button F3 to choose legionella mode active YES/NO.
2. To edit the legionella function, press down the MENU button for 3 secs and se-
lect “hot water”, then press F4 key.
3. Use F1 and F2 keys to scroll through the menu selecting each subtitle in turn by
pressing CONFIRM. See the table below for description of each setting.
4. Enter the desired number using the function keys and press CONFIRM.
During Legionella Prevention Mode the temperature of the stored water is in-
creased above 60°C to inhibit legionella bacterium growth. It is strongly recom-
mended that this is done at regular intervals. Please check local regulations for the
recommended frequency of heat ups.
Note: When failures occur on the FTC unit, the LP mode may not function
normally.
Menu subtitle Function Range Unit Defaultvalue
Hot water temp. Desired temp. of stored hot water 60–70 °C 65
Frequency Time between LP mode DHW tank heat ups 1–30 day 15
Start time Time when LP mode will begin 0:00–23:00 - 03:00
Max. operation time Maximum time allowed for LP mode DHW tank heat 1–5 hour 3
Duration of max. temp. The time period after LP mode max. water temp. has been reached 1–120 min 30
If you wish to make changes contact installer.