Daikin EPRA10EAV3 Installer's Reference Manual page 219

Bivalent
EPRA08~12EAV3+W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
Bivalent
Only applicable in case of auxiliary boiler.
About bivalent
The purpose of this function is to determine which heating source can/will provide
the heating, either the heat pump system or the auxiliary boiler or, if applicable,
the parallel operation of the two heat sources.
# Code
[9.C.1] [C-02]
▪ If Bivalent is disabled: Heating is done only by the heat pump within the
operation range. The permission signal for the auxiliary boiler is always inactive.
▪ If Direct (SH) is enabled: When the outdoor temperature drops below the
bivalent ON temperature (fixed or variable based on energy prices), the space
heating by the heat pump stops automatically and the permission signal for the
auxiliary boiler is active.
NOTICE
Direct (SH) operation is only possible if:
▪
Space heating is turned ON, and
▪
Tank operation is turned OFF.
INFORMATION
Direct (SH) is only possible in case of 1 leaving water temperature zone with:
▪
room thermostat control, OR
▪
external room thermostat control.
▪ If Indirect (DHW) is enabled: When boiler operation is more efficient than
heat pump operation (based on energy efficiency and operating temperatures)
the auxiliary boiler provides heat for domestic hot water, while the heat pump
continues to provide heat for the space heating circuit.
Description
Bivalent: Indicates, if space or DHW heating
can also be performed by means of another
auxiliary heat source than the heat pump system.
▪ 0 Off: No auxiliary boiler (gas boiler, oil burner)
is installed
▪ 1 Direct (SH): Set this value in case that the
auxiliary boiler is installed directly in the space
heating circuit.
▪ 2 Indirect (DHW): Set this value in case that
the auxiliary boiler is connected to the storage
tank and the heat generated by the auxiliary
boiler should be used for domestic hot water
heating only.
▪ 3 Indirect (DHW + SH): Set this value in
case that the auxiliary boiler is connected to
the storage tank and the heat generated by the
auxiliary boiler should be used for domestic hot
water heating as well as space heating support.
10 Configuration
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Installer reference guide
219