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5 Application guidelines
K1A Auxiliary relay for activation of indoor unit (field
supply)
K2A Auxiliary relay for activation of boiler (field supply)
Indoor Indoor unit
Auto Automatic
Boiler Boiler
NOTICE
▪ Make sure the auxiliary contact has enough differential
or time delay to prevent frequent changeover between
indoor unit and auxiliary boiler.
▪ If the auxiliary contact is an outdoor temperature
thermostat, install the thermostat in the shadow so that
it is NOT influenced or turned ON/OFF by direct
sunlight.
▪ Frequent changeover may cause corrosion of the
auxiliary boiler. Contact the manufacturer of the
auxiliary boiler for more information.
5.4
Setting up the domestic hot water tank
The DHW tank can be:
▪ Integrated in the indoor unit
▪ Installed standalone as option
5.4.1
System layout – Integrated DHW tank
Only for EHVH/X.
UI
a
b c
d
f
h
h
M
e
g
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Motorised 3‑way valve
g DHW tank
h Shut-off valve
i Collector (field supply)
FHL1...3 Under floor heating
UI User interface
5.4.2
System layout – Standalone DHW tank
Only for EHBH/X.
Installer reference guide
14
i
FHL1
FHL2
FHL3
a
b c
d e
f
f
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Shut-off valve
g Motorised 3‑way valve
h Collector (field supply)
i DHW tank
j Heat exchanger coil
FHL1...3 Under floor heating
5.4.3
Selecting the volume and desired
temperature for the DHW tank
People experience water as hot when its temperature is 40°C.
Therefore, the DHW consumption is always expressed as equivalent
hot water volume at 40°C. However, you can set the DHW tank
temperature at a higher temperature (example: 53°C), which is then
mixed with cold water (example: 15°C).
Selecting the volume and desired temperature for the DHW tank
consists of:
1
Determining the DHW consumption (equivalent hot water
volume at 40°C).
2
Determining the volume and desired temperature for the DHW
tank.
Possible DHW tank volumes
Type
Integrated DHW tank
Standalone DHW tank
Energy saving tips
▪ If the DHW consumption differs from day to day, you can program
a weekly schedule with different desired DHW tank temperatures
for each day.
▪ The lower the desired DHW tank temperature, the more cost
effective. By selecting a larger DHW tank, you can lower the
desired DHW tank temperature.
▪ The heat pump itself can produce domestic hot water of maximum
55°C (50°C if outdoor temperature is low). The electrical
resistance integrated in the heat pump can higher this
temperature. However, this consumes more energy. Daikin
recommends to set the desired DHW tank temperature below
55°C to avoid using the electrical resistance.
ERHQ011~016BA + ERLQ011~016CA + EHVH/X16S18+26CA
g
h
M
FHL1
FHL2
i
j
FHL3
Possible volumes
▪ 180 l
▪ 260 l
▪ 150 l
▪ 200 l
▪ 300 l
Daikin Altherma - Low Temperature Split
4P313777-1C – 2012.11
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