Daikin ETVH16UE6V7 Installer's Reference Manual page 218

10 | Configuration
Installer reference guide
218
▪ 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]
▪ Electricity price: [7.5.1], [7.5.2], [7.5.3]
▪ Gas price: [7.6]
[C‑03], [C‑04], and T
calc
Based on the settings above, the heat pump system calculates a value T
variable between [C‑03] and [C‑03]+[C‑04].
3°C
a
b
T [C-03]+[C-04]
[C-03]
calc
T Outdoor temperature
A
T Bivalent ON temperature (variable). Below this temperature, the auxiliary boiler will
calc
always be ON. T
3°C Fixed hysteresis to prevent too much switching between heat pump system and
auxiliary boiler
a Auxiliary boiler active
b Auxiliary boiler inactive
If the outdoor
temperature...
Drops below T
calc
Rises above T +3°C
calc
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
# Code
9.C.3 [C-03]
T
A
can never go below [C‑03] or above [C‑03]+[C‑04].
calc
Space heating by the heat
pump system...
Stops
Starts
OFF ON
SS1
X1M
Range: –25°C~25°C (step: 1°C)
, which is
calc
Then...
Bivalent signal for the
auxiliary boiler is...
Active
Inactive
Description
EPRA14~18D + ETVH16SU18+23E
Daikin Altherma 3 H HT F
4P644738-1D – 2023.10