Daikin Altherma HT User manual

User Guide – Altherma HT
For your new Daikin Altherma high temperature heat pump
your comfort. our world.

User Guide – Altherma HT
1
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!
Your new Daikin Altherma
heat pump
Outdoor unit Hot water cylinder Hydrobox Daikin Altherma controller
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
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.

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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 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.
Hydrobox
The hydrobox is located below the hot water
cylinder. This distributes hot water around the
central heating and to the cylinder. The Daikin
Altherma controller communicates with the
hydrobox for efficient use.
Cylinder
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. The cylinder
is being heated when the symbol is shown on
the Daikin Altherma controller. Once a week the
water in the cylinder is heated to 60°C to ensure
the cylinder remains free from bacteria.
Your heating system in detail
and getting the most from it

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.
Underoor 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.

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Your Daikin Altherma
remote controller
1. On/off 6. Room temp adjust 11. Weather compensation on/off
2. LCD display 7. Leaving water temp adjust 12. Quiet mode on/off
3. Set temperature of heating 8. Time adjust 13. Time display
4. Not used 9. Schedule timer on/off 14. Day of week indicator
5. Hot water on/off 10. Programming button 15. Operation mode icons
1
3
2
4
5
12
11
14
13
15
910 876

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Useful functions on your
Daikin Altherma controller
Reheat function
This mode will prevent your tank from cooling
down lower than a specified temperature
(as set-up by your installer). This will ensure your
tank is always at a minimum temperature so you
are less likely to run out of hot water.
On your Daikin controller press the
button for 5 seconds to enable reheat. The
icon will be displayed on your screen. To turn off
the reheat function, press the button.
The icon will disappear.
Central heating operation
This option will operate if you have a room
thermostat controller installed. Use the
button on the Daikin controller to switch
on/off central heating. When the and
room temperature is displayed too.
Use the and
buttons to increase or decrease your desired
room temperature. The maximum room
temperature setting is 32°C.

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Maximising your energy savings
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 water supply temperature up or down
by pressing the
buttons on the controller.
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.
This feature (called weather compensation or
economy mode) should be selected on the
controller, and the automatic symbol will
show in the controller display. If this symbol is
not shown, press the button.

User Guide – Altherma HT
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Changing the hot water timer settings
If you wish to set the hot water to heat at times other than those
already set, you need to adjust the controller:
1. To enter the schedule timer function, press
2. Press the button until the symbol
begins to flash on the display
3. Press
4. The time of the 1st action will now appear, you can scroll
through any programmed actions via
5. To adjust the action push and hold until the display
begins to flash
6. You can now adjust the action time via
7. Use to choose on/off
8. To confirm the changes press , it will then advance to
the next action
9. Repeat the last step until all required actions are programmed
10. Press and hold until ‘setting’ appears to save the changes
11. Press repeatedly to go back through the screen levels
until you are back to the normal screen
Setting the clock
If for any reason you require to re-set the clock,
1. Push and hold the button until the clock starts to flash
2. Adjust the time via the
3. Adjust the day via the
4. To save the changes push

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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.
Is the mains power switched o?
Check that the heating switches are switched
ON, including the switch located next to the
outdoor unit.
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.
Your checklist for
diagnosing possible faults
www.daikin.co.uk
For full user instructions, please refer to the Daikin Altherma
operation manual.