Stop
Start
Restart
Stop
DHW tank temp.
DHW max.
temp.
DHW max.
temp. drop
DHW max.
operation
time
DHW
mode
restriction
Time
DHW max.
temp.
DHW max.
temp. drop
DHW tank temp.
Stop
Start
Restart
Time
DHW
mode
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. opera-
tion 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 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 deliver primary hot water to the space heating if required.
However, if at this time there is no current demand for space
heating, 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 us-
ing 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 ac-
cording to underground temperature.
<DHW recharge>
Select the amount of DHW. If you need much hot water, se-
lect LARGE.
Return to the DHW/legionella prevention menu.
Note:
However, Large mode raises boiling-up frequency,
resulting in increase in power consumption.
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
Range Unit Default
value
DHW max. temp.
Desired temperature of stored hot water
40 - 60 °C
50
DHW max.
temp. 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 preventing further stored water heating
(Only when DHW max. operation time has passed.)
30 - 120 min 30
* When the DHW max. temp is set over 55°C, the temperature at which DHW mode restarts must be less than 50°C to protect the device.
DHW
mode
DHW
mode
Forced DHW
The forced DHW function is used to force the system to oper-
ate in DHW mode. In normal operation the water in the DHW
tank will be heated either to the target 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
finishes, the system will automatically return to normal opera
-
tion. To cancel forced DHW operation hold down button F1 in
the ‘Option Screen’.
B-244
Water to Water Heat Pump (WTW)
7
Cylinder
unit/
Hydrobox/GSHP/WTW
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