Daikin EHFZ03S18DJ3V Installer's Reference Manual page 146

10 | Configuration
Installer reference guide
146
INFORMATION
If a heat pump failure occurs and [A.6.C] is set to Manual, the room frost protection
function, the underfloor heating screed dryout function, and the water pipe
antifreeze function will remain active even if the user does NOT confirm emergency
operation.
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.
INFORMATION
Bivalent is only possible in case of 1 leaving water temperature zone with:
▪
room thermostat control, OR
▪
external room thermostat control.
# 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 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
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
Description
ERLA03DAV3 + EHFZ03S18DJ3V
Daikin Altherma 3 R F
4P596821-1B – 2021.10