6
|
Application guidelines
Installer reference guide
51
EPRA14~W1 + ETSH/X(B)16P30+50EF
Daikin Altherma 3 H HT ECH₂O
4P679467-1 – 2022.02
NOTICE
▪
Make sure the auxiliary contact has enough differential or time delay to prevent
frequent changeover between indoor unit and auxiliary boiler.
▪
If the auxiliary contact is an outdoor temperature thermostat, install the
thermostat in the shadow so that it is NOT influenced or turned ON/OFF by direct
sunlight.
▪
Frequent changeover may cause corrosion of the auxiliary boiler. Contact the
manufacturer of the auxiliary boiler for more information.
Setpoint of the auxiliary gas boiler
To prevent freeze-up of the water piping, the auxiliary 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 auxiliary gas boiler
6.3.2 Setting up an indirect auxiliary heat source for domestic hot water and space heating
The auxiliary boiler (field supply) is connected to the storage tank and controlled by
the ON/OFF signal on the indoor unit. It can do the domestic hot water heating
and, if allowed by the user, space heating via tank heating support. Whether heat
pump or auxiliary boiler operates, depends on outdoor and storage tank
temperatures.
Setup
1
Integrate the auxiliary boiler as follows:
A
B
a
b
c
d
d
e
A
Main leaving water temperature zone
B
One single room
a
Dedicated Human Comfort Interface (BRC1HHDA used as room thermostat)
b
Auxiliary boiler (field supply)
