Daikin Altherma 3 H F Installer's Reference Manual page 162

8 | Configuration
Installer reference guide
162
[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 always be ON. T
calc
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...
Drops below T
calc
Rises above T +3°C
calc
INFORMATION
▪
The bivalent operation function has no impact on the domestic water heating
mode. The domestic hot water is still and only heated by the indoor unit.
▪
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]
9.C.4 [C-04]
To determine the value of [C‑03], proceed as follows:
1 Determine the COP (= coefficient of performance) using the formula:
T
A
Space heating by the heat
pump system...
Stops
Starts
OFF ON
SS1
X1M
Range: –25°C~25°C (step: 1°C)
Range: 2°C~10°C (step: 1°C)
The higher the value of [C‑04], the higher the
accuracy of the switch-over between the heat
pump system and the auxiliary boiler.
, which is
calc
Then...
Bivalent signal for the
auxiliary boiler is...
Active
Inactive
Description
EPGA11~16DAV3 + EAVH16SU18+23DA6V
Daikin Altherma 3 H F
4P606487-1 – 2019.12
can
calc