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Gas boiler
Third-party gas boiler
a
Outdoor unit
b
Gas boiler
c
Space heating circuit
d1+d2
Parts of mandatory options EKADDONJH and
EKADDONJH2 (= connection kit for third-party gas boiler):
d1: External pump (EKADDONJH)
d2: Non-return valve (EKADDONJH2)
5.1.1
Dedicated gas boiler
The dedicated gas boiler (=NHY2KOMB28+32AA) is recommended
for new installations.
Using this gas boiler, you can produce domestic hot water as
follows:
▪ Domestic hot water by tank
▪ 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
5.1.2
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.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
System layout
d2
d2
a
b
c
d1
d
65°C
c
95°C
95°C
c
e
95°C
95°C
M
89°C
d
Using this gas boiler, you can only produce domestic hot water as
instant domestic hot water by gas boiler.
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
5 About the system
d
e5
f4
c
f3
f1
f2
–10
–5
0
T
(°C)
a
Installer reference guide
11
5
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