Daikin EPRA10EAV3 Installer's Reference Manual page 50

6 | Application guidelines
Installer reference guide
50
▪ Install non-return valves.
▪ The external heat source is controlled by the ON/OFF signal on the indoor unit
(X12M/3 and X12M/4). See
4
source" [ 130].
▪ To setup the heat emitters, see
4
system" [ 34].
Configuration
Via the user interface (configuration wizard):
▪ Set the use of a direct (SH) bivalent system as external heat source.
▪ Set the bivalent temperature and hysteresis.
NOTICE
▪
Make sure the bivalent hysteresis has enough differential to prevent frequent
changeover between indoor unit and auxiliary boiler.
▪
Because the outdoor temperature is measured by the outdoor unit air
thermistor, install the outdoor unit 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.
Changeover to external heat source decided by an auxiliary contact
▪ Only possible in external room thermostat control AND one leaving water
temperature zone (see
▪ The auxiliary contact can be:
- An outdoor temperature thermostat
- An electricity tariff contact
- A manually operated contact
- ...
▪ Setup: Connect the following field wiring:
L
H
Indoor/Auto/Boiler
A
K1A
N
B Boiler thermostat input
TI
A Auxiliary contact (normally closed)
H Heating demand room thermostat (optional)
K1A Auxiliary relay for activation of indoor unit (field supply)
K2A Auxiliary relay for activation of boiler (field supply)
Indoor Indoor unit
Auto Automatic
Boiler Boiler
"9.3.10 To connect the changeover to external heat
"6.2 Setting up the space heating/cooling
"6.2 Setting up the space heating/cooling
Com
Indoor
X12M
15 22
K1A
K2A
system" [
B TI
X Y
K2A
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
4
34]).