Daikin Altherma 3 R ECH2O Installer's Reference Manual page 236

11 | Configuration
Installer reference guide
236
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 , and T
calc
For space heating switch-over: Based on the settings above, the heat pump system
calculates a value T , which is variable between [C‑03] and [C‑03]+[C‑04].
calc
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
# Code
9.C.3 [C-03]
9.C.4 [C-04]
lim
T
A
can never go below [C‑03] or above [C‑03]+[C‑04].
calc
Space heating by the heat
pump system...
Stops
Starts
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.
Then...
Bivalent signal for the
auxiliary boiler is...
Active
Inactive
Description
ERLA11~16DAV3+W1 + EBSH/X(B)11+16P30+50DF
Daikin Altherma 3 R ECH₂O
4P663482-1B – 2022.07