Installation manual

Tank temp.
Time
Stop
Stop
Start
Restart
Restart temp.
Stop temp.
( LP mode : Legionella Prevention Mode )
LP mode
LP mode
Mode
finish
Duration of Max. temp.
Hot water temp.
Space
Heating
28
System Set Up
5
Please note that LP mode uses the assistance of electric heaters (if present)
to supplement the energy input of the heat pump. Heating water for long
periods of time is not effi cient and will increase running costs. The installer
should give careful consideration to the necessity of legionella prevention
treatment whilst not wasting energy by heating the stored water for excessive
time periods. The end user should understand the importance of this feature.
ALWAYS COMPLY WITH LOCAL AND NATIONAL GUIDANCE FOR YOUR
COUNTRY REGARDING LEGIONELLA PREVENTION.
<Explanation of Legionella Prevention Mode operation>
• At the time entered by the installer ‘Start time’ fl ow useful heat from the system
is diverted to heat the water in the storage tank.
• When the temperature of the stored water exceeds the ‘Hot Water temp.’ set by
the installer (above 65°C) water is no longer diverted to the tank.
• Whilst LP mode is in operation hot water is not directed to the space heating
circuit.
• Directly after LP mode operation ‘Duration of max. temp’ will operate. The dura-
tion of this feature is set by the installer and during its operation stored water
temperature will be monitored.
• If stored water temperature should drop to LP restart temp, LP mode will restart
and water flow from the plate heat exchanger will be directed to the tank to
boost the temperature. Once the set time for Duration of Max. temp has passed
LP mode will not recur for the set interval (set by installer).
• It is the responsibility of the installer to ensure the settings for legionella preven-
tion are compliant with local and national guidelines.
Mode 2 - Heating/Cooling
The heating and cooling menus deal with space heating and cooling using either
a radiator or under-fl oor system depending on the installation.
Cooling is only available on ERPT models. Cooling menus will not be displayed
unless the cylinder unit is an ERPT model.
From the main settings menu
1. Use F1 and F2 buttons to highlight heating/cooling icon then press CON-
FIRM.
2. The heating and cooling menu will be displayed.
3. To select the sub-menus press the function button below the icon required.
E.g. for MODE change press F1
Heating/Cooling
1. Under this sub-menu the mode of heating or cooling is selected.
2. For HEATING choose between
• Flow temperature (
)
• Room temperature (
)
• Compensation curve (
)
3. For COOLING choose between
If using an under fl oor system in cooling mode the fl ow temperature must be
selected and it should be set to avoid creating condensation.
• Flow temperature (
)
• Room temperature (
)
4. To choose between the different modes for heating and cooling highlight the
mode preferred and press select.
5. Press the BACK button to return to the heating and cooling menu.
If compensation curve mode was selected as the heating mode please read the
following instructions.
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 tem-
perature or for the maximum DHW time, whichever occurs fi rst. However should
there be a high demand for hot water ‘Forced DHW’ function can be used to
prevent the system switching to space heating (/cooling) and continue to provide
DHW tank heating.
Forced DHW mode is activated by pressing button F1 when the ‘Option Screen’
is displayed.