Installation manual

Tank temp.
DHW mode DHW mode
Time
DHW max.
temp.
DHW
start temp.
DHW max.
temp. drop
Stop
Start
Restart
Tank temp.
DHW max.
operation time
DHW mode
restriction
DHW mode
Time
DHW max.
temp.
DHW
start temp.
DHW max.
temp. drop
Stop
Stop
Start
Restart
27
System Set Up
5
Mode 1 - Domestic Hot Water (DHW)/Legionella Prevention
The domestic hot water and legionella prevention menus control the operation of
domestic hot water 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 F2 to display the HOT WATER (DHW) SETTING menu.
4. 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.
5. 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 starts 5–30 °C 10
DHW max. operation time Max time allowed for stored water heating DHW mode 30–120 min 30
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
<Explanation of DHW operation>
• When the tank temperature drops below the ‘DHW max. temp.’ set by the in-
staller, DHW mode operates and the flow from the primary heating circuit is
diverted to heat the water in the storage 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 hot water is not directed to the space heating
circuit.
• Directly after DHW mode operation ‘DHW mode restriction’ will operate. The du-
ration of this feature is set by the installer and during its operation DHW mode
can not be reactivated, allowing time for the system to deliver hot water to the
space heating if required.
• After the ‘DHW mode restriction’ operation the DHW mode can operate again
and 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
cylinder quickly using the full power of the heat pump. Eco mode takes a little
longer to heat the cylinder but the energy used is reduced. This is because heat
pump operation is restricted using signals from the FTC3 based on measured
cylinder temperature.
Note:
The actual energy saved in Eco mode will vary according to outdoor tem-
perature.
Return to the DHW/legionella prevention menu.
Legionella Prevention Mode settings
1. Use button F3 to chose legionella mode active YES/NO.
2. Use button F4 to edit the legionella function.
3. Use F2 and F3 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.
Menu subtitle Function Range Unit Default value
Legionella hot water temp. Desired temp of stored hot water 60–70 °C 65
Frequency Time between LP mode 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 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