Daikin EBLA09D V3 Series Installer's Reference Manual page 212

11 | Configuration
Installer reference guide
212
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]
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:
Formula
COP = (Electricity price / gas price)
boiler efficiency
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)
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.
(a)
× If:
▪ Electricity price: 20 c€/kWh
▪ Gas price: 6 c€/kWh
▪ Boiler efficiency: 0.9
Then: COP = (20/6)×0.9 = 3
, which is
calc
Then...
Bivalent signal for the
auxiliary boiler is...
Active
Inactive
Description
Example
EBLA09~16D + EDLA09~16D
Daikin Altherma 3 M
4P620241-1B – 2022.05