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Configuration
Installer reference guide
211
EPRA14~18D + ETVH/23E
Daikin Altherma 3 H HT F
4P644737-1A – 2022.03
▪
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
calc
, which is
variable between [C‑03] and [C‑03]+[C‑04].
T
A
T
calc
[C-03]+[C-04]
3°C
[C-03]
a
b
T
A
Outdoor temperature
T
calc
Bivalent ON temperature (variable). Below this temperature, the auxiliary boiler will
always be ON. T
calc
can never go below [C‑03] or above [C‑03]+[C‑04].
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…
Then…
Space heating by the heat
pump system…
Bivalent signal for the
auxiliary boiler is…
Drops below T
calc
Stops
Active
Rises above T
calc
+3°C
Starts
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.
YC Y1 Y2 Y3 Y4
X1
X2
X3
X4
OFF ON
X2M
SS1
X1M
#
Code
Description
9.C.3
[C-03]
Range: –25°C~25°C (step: 1°C)
