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3 About the system
▪ Instant domestic hot water by gas boiler
Dedicated gas boiler + Instant domestic hot water
b
a
a
Outdoor unit
b
Gas boiler
c
Space heating circuit
d
Instant domestic hot water
Dedicated gas boiler + Domestic hot water via tank
a
b
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.
Installation manual
6
d
65°C
c
95°C
95°C
c
e
95°C
95°C
M
89°C
d
Third-party gas boiler + Instant domestic hot water
e5
b
a
e4
e1
≤10 m
e2
e3
f5
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 – Pulse-width modulation (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 boiler + 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
T
(°C)
min
60
50
40
30
20
10
0
–30
–25
–20
–15
T
Outdoor temperature
a
T
Minimum weather-dependent setpoint for third-party gas
min
boiler
3.2
Freeze protection
You must protect the system against freezing. This involves:
Daikin Altherma H Hybrid – Heat pump module
d
e5
f4
c
f3
f1
f2
–10
–5
0
T
(°C)
a
EJHA04AAV3
4P530607-1D – 2020.02
5
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