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User Guide – New Altherma LT Split
For your new Daikin Altherma low temperature heat pump
Your new Daikin Altherma
heat pump
In this manual you will find information and guidelines that will allow
you to run your Daikin Altherma heat pump system in the most energy
efficient and cost effective way.
We hope you enjoy a warm and comfortable winter season!
System overview
The heart of your new central heating system
is a highly efficient Daikin Altherma air source
heat pump. The heat pump heats the water
which flows around your central heating and
separately heats the hot water when required
in your hot water cylinder. The central heating
is usually controlled from a Daikin controller or
Outdoor unit
Hot water cylinder
programmable room thermostat which
switches the heat pump on and off at preset
times, sending warm water through the
central heating. Most radiators have thermostats
(TRV’s) fitted to control the individual
room temperatures.
Daikin Altherma controller
User Guide – New Altherma LT Split
Your heating system in detail
and getting the most from it
Outdoor unit
Outside is the heat pump. This extracts heat
from the air, even below 0°C and uses this heat
to heat the water passing through the central
heating and hot water cylinder.
The hydrobox is located indoors. This distributes
hot water around the central heating and
to the cylinder. The Daikin Altherma controller
communicates with the hydrobox for
efficient use.
The outdoor unit pulls in air from the rear,
extracts the heat in the air, and blows the cooled
air out the front. This is done automatically,
and there is no need to set or adjust it.
If the rear of the outdoor unit gets clogged
up with leaves or debris, the efficiency of your
heating system can be reduced, this should be
checked regularly and cleaned with a soft brush.
Similarly, don’t block the front of the unit up by
leaning anything against it.
User Guide – New Altherma LT Split
Hot water is stored in the cylinder. To ensure low
running costs the cylinder is normally set to heat
to 50°C. Your system is set up to heat the water
in the cylinder at the time when it is cheapest.
If you have Economy 7 this will be during
off-peak periods. If not, it will be during the
day when the air temperature is higher. Once
a week the water in the cylinder is heated to
above 60°C to ensure the cylinder remains free
from bacteria.
Hot water preparation in detail
Your system is set up to heat the water in the cylinder at the time
when it is cheapest. If you have Economy 7 this will be during
off-peak periods. If not, it will be during the day when the air
temperature is higher.
Programmable room thermostat
You may have a room thermostat installed in
your property. It would be located in the hall or
within certain rooms. It controls when the house
is heated, and to what temperature.
It is likely the thermostat has been set to
heat the house to 21°C in the early morning,
lunchtime and evening, with a cooler 18°C
at other times from Monday to Friday.
At weekends, it is set to 21°C from early morning
until late evening, with 18°C over night.
Heat emitters: radiators
Most radiators are fitted with Thermostatic
Radiator Valves (TRV’s) as shown in the picture
which ensures rooms will not become
too warm.
Temperatures are represented by numbers
or roman numerals I, II, III, IIII. The higher the
number, the warmer the room temperature.
Each valve should be set according to the
temperature you wish to achieve.
Underfloor heating (UFH) and/or
fan coil units (FCU)
If UFH heating is installed you may see
a manifold in your airing cupboard
or similar with pipes going
into the floor. This will heat
your floors, which in turn
heat your home. If FCU are
installed you will see them
on your walls. FCU operate
in a similar way to radiators,
but a fan in the unit
pushes heat into the
space around it.
Your Daikin Altherma
remote controller
1. Home pages
• Switches between home pages for room temperature, tank temperature and leaving water
temperature (when on the home pages)
• Goes to the home page (when you are in the menu structure)
2. Error information
• If an error occurs with your Daikin Altherma heat pump unit the information is displayed here
• Turns on or off one of the controls (room temperature, tank temperature and leaving
water temperature), depending on which home screen is shown on the display
• Opens menu page when on the home page or goes back a level when you are within the
menu structure
5. Navigation buttons
• Navigates through the menu structure, selects and changes settings
OK/enter button
• Confirms a selection
• Goes to the next step when in programming mode
• Enters a sub-menu when in the menu structure
User Guide – New Altherma LT Split
Useful functions on your
Daikin Altherma controller
Raising the hot water temperature
Storing water at higher temperatures is wasteful,
because heat loss from the cylinder will be
increased and the heat pump running costs
will increase.
However, should you find the hot water is not
hot enough, it can be increased by going to the
domestic hot water home page. Press
you reach the domestic hot water home page
(display will show ‘tank’ in top right corner).
You will see either a temperature setting e.g.
symbol on the screen.
Additional hot water other than
pre-set times (boost function)
If you run out of hot water you can go into
booster mode. Press
until you reach the
domestic hot water home page.
Now press until you reach to activate
domestic hot water booster mode.
Note: Increased use of boost function will affect
overall efficiency of the system.
Use the
button to increase the volume of
hot water in the tank.
Note: You need to ensure the domestic hot
water function is ‘ON’ to be able to adjust the
settings. Press
if you do not see a green light
above the
Note: If you see the
symbol, this
means the domestic hot water is based on
weather compensation, thus cannot be
changed from the home menu.
User Guide – New Altherma LT Split
Maximising your energy savings
To increase the efficiency of the central heating
system, your heat pump will automatically vary
the temperature of the water going through
your central heating. The colder the temperature
gets outside, the warmer the circulating water
through your central heating.
When in the automatic (weather compensation)
mode, if you feel the house is too warm or
not warm enough you can adjust the central
heating temperature up or down. Press
until you reach the room temperature home
page. Use the
button to increase
the room temperature.
Note: You need to ensure the room temperature function is ‘ON’ to be able to adjust the settings.
if you do not see a green light above the
Activating the schedule timer
To activate the schedule timer press
until you reach the
room temperature home page (display will show ‘room’ in top
right corner). Use the
to move between heating modes.
When you reach the
symbol you are in scheduled mode.
The next scheduled timer function is shown at the bottom of
the screen, for example wed 17:00
Heating modes: = Scheduled mode
= Comfort daytime mode (20°C)
= Eco nighttime mode (18°C)
Note: = At the next scheduled action, desired temperature will increase
= At the next scheduled action, desired temperature will not change
= At the next scheduled action, desired temperature will decrease
User Guide – New Altherma LT Split
Setting the clock
If for any reason you require to re-set the clock,
to go to any home page
to enter the menu function and press
‘set time / date’ is highlighted
3. Press
until you reach the ‘time’ setting. Press
4.Press to adjust the hour or and then or to move across
to adjust the minutes. Now Press or to adjust the minutes
to confirm and save the new time and press
return to the home page
Changing the central heating timer settings
If you wish to set the central heating to heat at times other than
those already set, you need to adjust the settings on the controller:
to go to the home page
to enter the menu function
3. Press
until ‘user settings’ is highlighted, press
4. Press
until ‘set schedules’ is highlighted, press
5. When ‘room temp.’ is highlighted, press
6. When ‘set heating schedule’ is highlighted, press
7.If you wish to change an existing schedule choose the name
of the schedule you wish to change and press
, OR if you
want to start a new schedule, choose ‘empty’ and press
8.‘Mon’ will be highlighted, this is the schedule for Monday.
to enter the schedule for the selected day, or or
to select another day
Continued overleaf...
User Guide – New Altherma LT Split
Changing the central heating timer settings
9.Press or to change the hour time of the schedule and
to change minutes. Press
to set type of schedule.
You can either set a room temperature or choose ‘eco’ (18°C)
or ‘comfort’ (20°C) modes. Press or to switch between
modes or to adjust temperatures
to move to the next schedule for the day.
Repeat step 9 for the next timer schedule
11.When you have set all schedules for the day, press
12.You are able to copy the schedule set for Monday, to other days
in the week. Press until ‘copy day’ is highlighted. Press
13.‘No’ will be highlighted under ‘Tue’. If the same schedule is
required for Tuesday, press until ‘yes’ appears. Press to
move to Wednesday. Repeat this step until you have copied
the schedule for the days you require. Press
to confirm
and return to the schedule timer screen
14.If you would like a different schedule, for example on the
weekend, press until the days on the left-hand side are
15.Press or until the day you wish to adjust is highlighted.
Press to enter schedule timer adjustment screen and
adjust timer schedules as described in step 9
16.When all schedules are set, press
‘same schedule’ is reached, press
and press
17.Save the schedule timer under either ‘user defined 1, 2 or 3’.
Press or to move between the user schedules 1, 2 or 3.
to confirm
18.You can edit the name of the schedule. Press or to adjust
the first letter and to adjust the next letters. Press
to return to the home screen
User Guide – New Altherma LT Split
Changing the central heating timer settings
to enter menu and press
is highlighted and press
until ‘select schedules’
21. When ‘room temperature’ is highlighted press
22. When ‘heating’ is highlighted, press
23. Press until the name of the schedule you have changed is
highlighted and press
Your checklist for
diagnosing possible faults
If the radiator is too cold check that
the radiator TRV is set to a high
enough level.
A room may become warm enough without
the radiator being more than lukewarm.
Is the programmable thermostat
set too low?
Check that the temperature on the
programmable thermostat is set high enough
to start the heat pump.
In the event you have checked the points
opposite, and the system still fails to operate
normally, you can manually reset the system by
turning off the power, waiting 60 seconds then
turning it back on.
If the system still does not operate
as normal, check the display on the controller
for a fault code (typically a number and a letter
for example 7H) and contact your housing
association, making reference to the
displayed code.
Is the mains power switched off?
Check that the heating switches are switched
ON, including the switch located next to the
outdoor unit.
For full user instructions, please refer to the Daikin Altherma
operation manual.
User Guide – New Altherma LT Split
your comfort. our world.
Balanced Paper
Daikin units comply with the European regulations
that guarantee the safety of the product.
Daikin Europe N.V. participates in the Eurovent Certification
Programme for Air Conditioners (AC), Liquid Chilling
Packages (LCP) and Fan Coil Units (FC); the certified data of
certified models are listed in the Eurovent Directory. Multi
units are Eurovent certified for combinations up to 2 indoor
units. VRV products, Rooftops, FWB-J and FWD-units are not
within the scope of the Eurovent Certification Programme.
The present leaflet is drawn up by way of information only and
does not constitute an offer binding upon Daikin UK. Daikin UK has
compiled the content of this leaflet to the best of its knowledge.
No express or implied warranty is given for the completeness,
accuracy, reliability or fitness for particular purpose of its content
and the products and services presented therein. Specifications are
subject to change without prior notice. Daikin UK explicitly rejects
any liability for any direct or indirect damage, in the broadest sense,
arising from or related to the use and/or interpretation of this leaflet.
All content is copyrighted by Daikin UK.
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