Daikin Altherma 3 WS EWSAH06UD 9W Series Installer's Reference Manual page 204

11 | Configuration
Bivalent
Installer reference guide
204
Brine low pressure switch
When a brine low pressure switch is installed, the unit must be configured to work
with the switch. When the switch is removed or disconnected, this setting must be
set to OFF.
# Code
N/A [C-0B]
Bivalent
Only applicable in case of auxiliary boiler.
NOTICE
Bivalent operation is only possible if:
▪
Space heating is turned ON, and
▪
DHW tank operation is turned OFF.
INFORMATION
Bivalent is only possible in case of 1 leaving water temperature zone with:
▪
room thermostat control, OR
▪
external room thermostat control.
About bivalent
The purpose of this function is to determine which heating source can/will provide
the space heating, either the heat pump system or the auxiliary boiler.
# Code
[9.C.1] [C-02]
▪ If Bivalent 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.
▪ If Bivalent is disabled: Space heating is only done by the heat pump within the
operation range. The permission signal for the auxiliary boiler is always inactive.
The switch-over between the heat pump system and the auxiliary boiler is based
on the following settings:
▪ [C‑03] and [C‑04]
Description
Activation of the brine low pressure switch
▪ 0: OFF
▪ 1: On
Description
Bivalent: Indicates if the space heating is also
performed by means of another heat source than
the system.
▪ 0 No: Not installed
▪ 1 Yes: Installed. The auxiliary boiler (gas boiler,
oil burner) will operate in space heating when
the outdoor ambient temperature is low.
During bivalent operation, the heat pump will
run in domestic hot water operation when tank
heat-up is required, or is turned OFF. Set this
value in case an auxiliary boiler is used.
EWSAH/X06UD
Daikin Altherma 3 WS
4P675765-1 – 2022.04