Mitsubishi Electric EHGT17D-YM9ED Bedienungsanleitung Seite 9

4
Customising Settings for Your Home
[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 seconds, then select
"hot water".
4. Press F2 key to display the HOT WATER (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 set-
ting.
6. Enter the desired number using the function keys and press CONFIRM.
Menu subtitle Function
DHW max. temp.
Desired temperature of stored hot water
DHW max. Difference in temperature between DHW max. temp. and the temperature at
temp. drop which DHW mode restarts
DHW max.
Max. time allowed for stored water heating DHW mode
operation time
DHW mode restriction The time period after DHW mode when space heating has priority over DHW
mode temporarily preventing further stored water heating
(Only when DHW max. operation time has passed.)
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. temp. drop" (set by in-
staller), DHW mode operates and the flow from the primary
heating 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 di-
rected to the space heating circuit.
• Directly after DHW max. operation time 'DHW mode restric-
tion' will routinely operate. 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 de-
liver primary hot water to the space heating if required. How-
ever, if at this time there is no current demand for space heat-
ing, 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 ac-
cording 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 re-
duced. This is because heat pump operation is restricted using
signals from the FTC based on measured DHW tank tempera-
ture.
Note: The actual energy saved in Eco mode will vary ac-
cording to underground temperature.
<[DHW recharge]>
Select the amount of DHW. If you need much hot water, select
LARGE.
Return to the DHW/legionella prevention menu.
Note:
However, Large mode raises boiling-up frequency,
resulting in increase in power consumption.
DHW tank temp.
Stop
DHW max.
temp.
DHW max.
temp. drop
Start
DHW
mode
DHW tank temp.
DHW max.
Stop
temp.
DHW max.
temp. drop
Start
DHW
DHW max.
mode
operation
restriction
time
Forced DHW
The forced DHW function is used to force the system to operate
in DHW mode. In normal operation the water in the DHW tank
will be heated either to the set temperature or for the maximum
DHW time, whichever occurs first. However should there be a
high demand for hot water 'Forced DHW' function can be used
to prevent the system from routinely switching to space heating
and continue to provide DHW tank heating.
Forced DHW operation is activated by pressing button F1 and
Back button in the 'Option Screen'. After DHW operation finish-
es, the system will automatically return to normal operation. To
cancel forced DHW operation hold down button F1 in the 'Option
Screen'.
Default
Range Unit
value
40 - 60 °C 50
5 - 30 °C 10
30 - 120 min 60
30 - 120 min 30
Restart
Time
DHW
mode
Stop
Restart
Time
DHW
mode
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