8 Configuration
Installer reference guide
73
ERGA04~08DAV3(A) + EHVH/X04+08S18+23DA
Daikin Altherma – Low temperature split
4P495248-1 – 2017.12
#
Code
Description
[9.C.1]
[C-02]
Bivalent: Indicates if the space heating is
also performed by means of another heat
source than the system.
▪ 0 No: Not installed
▪ 1 Yes: Installed. The auxiliary boiler
(gas boiler, oil burner) will operate
when the outdoor ambient temperature
is low. During bivalent operation, the
heat pump is turned off. Set this value
in case an auxiliary boiler is used.
▪ 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 indoor unit stops automatically
and the permission signal for the auxiliary boiler is active.
▪ If Bivalent is disabled: Space heating is only done by the indoor
unit within the operation range. The permission signal for the
auxiliary boiler is always inactive.
INFORMATION
▪ The combination of setting [4‑03]=0/2 with bivalent
operation at low outdoor temperature can result in
domestic hot water shortage.
▪ 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 EKRP1HB (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
Boiler efficiency
Depending on the used boiler, this should be chosen as follows:
#
Code
Description
[9.C.2]
[7‑05]
▪ 0: Very high
▪ 1: High
▪ 2: Medium
▪ 3: Low
▪ 4:Very low
Possibility 1: Based on the outdoor temperature
Set all electricity prices ([7.5.1]~[7.5.3]) to "0" in the menu structure.
Also set the following values:
NOTICE
Do NOT use overview settings!
#
Code
Description
[9.C.3]
[C-03]
Bivalent ON temperature: Defines the
outdoor temperature below which the
permission signal for the auxiliary boiler
is active (X1 and X2 on EKRP1HB is
closed) and space heating by indoor unit
is stopped.
[9.C.4]
[C-04]
Hysteresis: Defines the temperature
difference between the ON temperature
and the OFF temperature.
Permission signal X1–X2
T
A
[C-03]
[C-04]
a
b
T
A
Outdoor temperature
[C-03]
Bivalent ON temperature (fixed)
a
Auxiliary boiler active
b
Auxiliary boiler inactive
Possibility 2: Based on the outdoor temperature and energy prices
The installer can set a temperature range [C‑04]. Depending on the
energy prices, a calculated point T
calc
varies within a range between
[C‑03] and [C‑03]+[C‑04]. It is recommended to choose [C‑04] bigger
than the default value to have an optimal operation when choosing
possibility 2.
Electricity and gas prices
#
Code
Description
[7.5.1]
N/A
Electricity price > High
[7.5.2]
N/A
Electricity price > Medium
[7.5.3]
N/A
Electricity price > Low
[7.6]
N/A
Gas price
INFORMATION
Electricity price can only be set when bivalent is ON
([9.C.1] or [C-02]). These values can only be set in menu
structure [7.5.1], [7.5.2] and [7.5.3]. Do NOT use overview
settings.
When the outdoor temperature reaches below the T
calc
point, then
the permission signal for the auxiliary boiler becomes active. To
prevent too much switching, there is a hysteresis of 3°C.
#
Code
Description
[9.C.3]
[C-03]
Bivalent ON temperature: Below this
temperature bivalent operation will
always be ON.
[9.C.4]
[C-04]
Operation range between which T
calc
is
calculated.
Permission signal X1–X2 (
EKRP1HB
)
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].
a
Auxiliary boiler active
b
Auxiliary boiler inactive
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