Daikin ERGA06EAV3H Installer's Reference Manual page 228

11 | Configuration
Installer reference guide
228
When the storage tank temperature rises above the temperature required to
ensure sufficient domestic hot water, the resulting energy can be used to support
space heating. This energy can either be provided by a solar system or an auxiliary
boiler connected to the storage tank. The latter is desirable, if the auxiliary heater
is at the given conditions more efficient than the heat pump. To ensure optimal
energy usage, several parameters should be adjusted according to the individual
system setup.
NOTICE
To ensure safe operation of the system, do NOT turn off DHW when space heating is
required.
Tank boiler hysteresis
# Code
[9.O.1] [7‑0D]
The tank boiler hysteresis determines the switch between space heating by heat
pump (while boiler is preheating the tank) and space heating by tank heating
support (while boiler may or may not operate).
This applies only, when tank energy is allowed to be used for space heating
([C‑02]=3) and the auxiliary boiler is deemed more efficient by the efficiency
calculation for space heating. For lower tank boiler hysteresis values, the system
switches more often between the two operation modes. Higher hysteresis values
lead to an increase in boiler operation and the space heating support starts only at
higher tank temperatures.
T
tank
HP!
B:on
T
B off
T
set
HP
T
SH
HP on
HP
tank
B Boiler
HP Heat pump
HP Tank heating by heat pump
tank
HP Space heating by heat pump
SH
Tank Space heating by tank heating support
SH
T Storage tank temperature
tank
T In this example: Tank setpoint (may differ depending on space heating setpoint)
set
T Boiler off temperature (T
B Off
T HP tank heating ON temperature (Tank setpoint–[6‑00])
HP on
HP! HP more efficient according to efficiency calculation for space heating
B! Boiler more efficient according to efficiency calculation for space heating
B:on Boiler on
B:OK Boiler on allowed
Support Tank state: Support
Preheat Tank state: Pre heating
Range: 2°C~20°C (step: 0.5°C)
! B H ! P
B:on
Support
[7-0D]
3°C
[6-00]
Tank
SH
HP
SH
HP
tank
+3+[7‑0D])
set
Description
B:OK
Preheat
t
ERGA04~08EAV3+V3A+V37 + EHSH/X(B)04+08P30+50EF
Daikin Altherma 3 R ECH₂O
4P678716-1 – 2022.01