Daikin EPRA14DAW1 Installer's Reference Manual page 190

9 | Configuration
Installer reference guide
190
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:
Formula
COP = (Electricity price / gas price)
boiler efficiency
(a)
Make sure to use the same units of measurement for the electricity price and gas price
(example: both c€/kWh).
2 Determine the value of [C‑03] using the graph. For an example, see the table
legend.
COP
6
5
4
3
2
1
0
-14 -12 -10 -8 -6
a [C‑03]=2.5 in case of COP=3 and LWT=35°C
b [C‑03]=10.5 in case of COP=3 and LWT=55°C
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
-4 -2 0 2 4 6 8 10
2.5 (a)
10.5 (b)
Description
Example
12 14
EPRA14~18DAV3+W1 + ETVH/X16S18+23DA6V+9W(G)
Daikin Altherma 3 H HT F
4P587502-1A – 2020.01