Daikin ERLA03DAV3 Installer's Reference Manual page 128

9 | Configuration
Installer reference guide
128
Bivalent
Only applies to indoor unit installations with an auxiliary boiler (alternating
operation, connected in parallel). The purpose of bivalent operation is to
determine which heating source can/will provide the space heating, either the
indoor unit or an auxiliary boiler.
# Code
N/A [C-02]
▪ If bivalent is enabled: When the outdoor temperature drops below the bivalent
ON, the space heating by the indoor unit stops automatically and the permission
signal for the auxiliary boiler is active.
▪ If bivalent is disabled: Space heating is only done by the indoor unit within the
operation range. The permission signal for the auxiliary boiler is always inactive.
INFORMATION
▪
The bivalent operation function has no impact on the domestic water heating
mode. The domestic hot water is still and only heated by the indoor unit.
▪
The permission signal for the auxiliary boiler is located on the EKRP1HBAA (digital
I/O PCB). When it is activated, the contact X1, X2 is closed and open when it is
deactivated. See illustration below for the schematic location of this contact.
X2M
YC Y1 Y2 Y3 Y4
Boiler efficiency
Depending on the used boiler, this should be chosen as follows:
# Code
N/A [7‑05]
Indicates if the space heating is also performed
by means of another heat source than the
system.
▪ 0 No
▪ 1 Bivalent : Installed. The auxiliary boiler (gas
boiler, oil burner) will operate when the
outdoor ambient temperature is low. During
bivalent operation, the heat pump is turned off.
Set this value in case an auxiliary boiler is used.
OFF ON
SS1
X1M
Boiler efficiency
▪ 0: Very high
▪ 1: High
▪ 2: Medium
▪ 3: Low
▪ 4: Very low
Description
Description
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1A – 2020.05