5 About the system
Installer reference guide
11
EJHA EHY32AA
Daikin Altherma Hybrid hydrosplit heat pump
4P531180-1 – 2018.06
Gas boiler
System layout
Third-party gas boiler
d2
d1
d2
b
a
c
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 (=EHY32AA) 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 Instant domestic hot water
a
c
b
d
65°C
95°C
95°C
a
Outdoor unit
b
Gas boiler
c
Space heating circuit
d
Instant domestic hot water
Dedicated gas Domestic hot water via tank
a
b
c
e
d
M
95°C
95°C
89°C
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.
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 – 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 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
