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Configuration
Installer reference guide
223
ERGA04~V3A+V37 + EHSH/X(B)04+08P30+50EF
Daikin Altherma 3 R ECH₂O
4P678716-1 – 2022.01
INFORMATION
Direct (SH) is only possible in case of 1 leaving water temperature zone with:
▪
room thermostat control, OR
▪
external room thermostat control.
▪
If
Indirect (DHW)
is enabled: When boiler operation is more efficient than
heat pump operation (based on energy efficiency and operating temperatures)
the auxiliary boiler provides heat for domestic hot water, while the heat pump
continues to provide heat for the space heating circuit.
▪
If
Indirect (DHW + SH)
is enabled: The boiler primarily covers or supports
domestic hot water heating (based on energy efficiency and operating
temperatures). Moreover, energy provided by the boiler is large enough to cover
the full building demand (F-07]=0), the switch-over between heat pump
operation and boiler operation for space heating is determined by the efficiency
calculation. If the boiler is intended solely for heat pump support ([F-07]=1),
primarily the heat pump is operation for space heating and the boiler is activated
to support in case of capacity shortage.
The switch-over between the heat pump system, parallel bivalent operation (if
applicable) and the auxiliary boiler is based on the following settings:
▪
[C‑03] and [C‑04]
▪
Electricity and gas prices ([7.5.1], [7.5.2], [7.5.3], and [7.6]) or PE factor [7-03]
▪
[F-02] (only for [C-02]=2/3)
[C‑03], [C‑04],
T
calc
, and
T
lim
For space heating switch-over: 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
#
Code
Description
9.C.3
[C-03]
Range: –25°C~25°C (step: 1°C)
9.C.4
[C-04]
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.
