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DANGER: RISK OF BURNING
In case of high leaving water set points for space heating
(either a high fixed set point or a high weather-dependent
set point at low ambient temperatures), the heat exchanger
of the boiler can be heated up to temperatures higher than
70°C.
In case of a tapping demand, it is possible that a small
volume of water tapping (<0.3 l) has a temperature higher
than 70°C. To prevent scalding, it is recommended to
install a thermostatic valve according to the following
schematic:
d
a=boiler, b=domestic hot water from the boiler, c=cold
water inlet, d=shower, e=thermostatic valve (field supply)
To connect the water piping for domestic hot
water (applicable for Switzerland)
For Switzerland, domestic hot water should be made by a domestic
hot water tank. The domestic hot water tank must be installed with a
3-way valve to the space heating piping. See the manual of the
domestic hot water tank for more details.
To connect the water piping for space heating
NOTICE
To prevent leakages, do NOT rotate existing connections.
NOTICE
Mount the pipes without tension to avoid ticking sounds
from the pipes.
1 Rinse the space heating installation carefully.
2 Connect the space heating outlet (a) and space heating inlet (b)
to their connections as indicated in the following illustration:
a
Fit the space heating installation with the following parts:
▪ A filling/draining tap in the space heating inlet, immediately
underneath the unit.
▪ A draining tap at the lowest point of the installation.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
a
b
c
e
b
▪ An overflow valve of 3 bar in the input pipe at a distance of no
more than 500 mm from the unit. Between the unit and the
overflow valve there may be no valve or constriction.
▪ An expansion vessel in the space heating inlet (in the B-pack or in
the installation).
▪ If there are pipes running up, use a check valve within close
distance of the unit. This prevents a thermosiphon effect from
occurring during tap water operation.
Note that the optional valve kits EKVK4A and EKVK6A can also be
used to connect the space heating installation.
NOTICE
Make sure that the straight brass fitting connections are
tightened thoroughly to prevent leakage. Maximum torque
is 30 N∙m.
9.6.5
To protect the water circuit against
freezing
About freeze protection
Frost can damage the system. To prevent the hydraulic components
from freezing, the software is equipped with special frost protection
functions, that include the activation of pump in case of low
temperatures.
However, in case of a power failure, these functions cannot
guarantee protection.
Do one of the following to protect the water circuit against freezing:
▪ Add glycol to the water. Glycol lowers the freezing point of the
water.
▪ Install freeze protection valves. Freeze protection valves drain the
water from the system before it can freeze.
NOTICE
If you add glycol to the water, do NOT install freeze
protection valves. Possible consequence: Glycol leaking
out of the freeze protection valves.
Freeze protection by glycol
Adding glycol to the water lowers the freezing point of the water.
The required concentration depends on the lowest expected outdoor
temperature, and on whether you want to protect the system from
bursting or from freezing. To prevent the system from freezing, more
glycol is required. Add glycol according to the table below.
INFORMATION
▪ Protection against bursting: the glycol will prevent the
piping from bursting, but NOT the liquid inside the
piping from freezing.
▪ Protection against freezing: the glycol will prevent the
liquid inside the piping from freezing.
Lowest expected
Prevent from
outdoor
bursting
temperature
–5°C
10%
–10°C
15%
–15°C
20%
–20°C
25%
–25°C
30%
9 Installation
Prevent from
freezing
15%
25%
35%
—
—
Installer reference guide
37
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