3 About the system
Installation manual
6
EJHA04AAV3
Daikin Altherma hybrid monobloc – Heat pump module
4P530607-1B – 2018.10
Dedicated gas Domestic hot water via tank
a
b
c
e
d
M
a
Outdoor unit
b
Gas boiler
c
Space heating circuit
d
Domestic hot water via tank
e
Motorised 3‑way valve
3.1.2
Third-party gas boiler
For existing installations, you do not need to buy a new gas boiler.
You can reuse the existing gas boiler, and the wiring of the old
thermostat.
Using this gas boiler, you can only produce domestic hot water as
instant domestic hot water by gas boiler.
Third-party gas Instant domestic hot water
e5
≤10 m
e1
e4
e2
e3
f1
f2
f3
f4
f5
a
b
c
d
e5
a
Outdoor unit
b
Gas boiler
c
Space heating circuit
d
Instant domestic hot water
e1~e5
Parts of mandatory options EKADDONJH and
EKADDONJH2 (= connection kit for third-party gas boiler).
For installation instructions, see the installation manual of
the connection kit.
e1
: External pump (EKADDONJH)
e2
: External pump cable – Power supply (EKADDONJH2)
e3
: External pump cable – PWM signal (EKADDONJH2)
e4
: Distance between external pump and gas boiler must
be as short as possible
e5
: Non-return valve (EKADDONJH2)
f1~f5
Connection of user interface (you can reuse old wiring):
f1
: Remove old thermostat
f2
: Install new user interface
f3
: Reuse old wiring
f4
: Disconnect old wiring from the gas boiler, and connect it
to new wiring
f5
: Connect new wiring to the outdoor unit
Third-party gas Domestic hot water via tank
Not possible.
Setpoint of the third-party gas boiler
To prevent freeze-up of the water piping, the third-party gas boiler
must have a fixed setpoint ≥55°C, or a weather-dependent setpoint
≥T
min
.
0
–30
–25
–20
–15
–10
–5
0
5
20
30
40
50
60
10
T
a
(°C)
T
min
(°C)
T
a
Outdoor temperature
T
min
Minimum weather-dependent setpoint for third-party gas
boiler
3.2
Freeze protection
You must protect the system against freezing. This involves:
▪ Choosing between glycol and freeze protection valves
▪ Installing the bottom plate heater
3.2.1
Glycol or freeze protection valves
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.
INFORMATION
For more information about glycol and freeze protection
valves, see
"5.3.3 To protect the water circuit against
3.2.2
Bottom plate heater
To prevent freeze-up of the bottom plate you can install the optional
bottom plate heater. In certain circumstances this is required.
Bottom plate heater (EKBPHT04JH)
▪ Prevents freeze-up of the bottom plate.
▪ Required in areas with ambient temperature <–5°C and high
relative humidity for at least 3 consecutive days.
▪ For installation instructions, see the installation manual of the
bottom plate heater.
