Daikin EPRA10EAV3, Installer'S Reference Manual

Page: 225 / 304

10 | Configuration
Installer reference guide
225
EPRA08~W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1B – 2022.07
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 Description
[9.O.1] [7‑0D] Range: 2°C~20°C (step: 0.5°C)
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
HP!
[7-0D]
3°C
[6-00]
T
B off
T
set
T
HP on
! P H ! B
B:on B:on
Support
B:OK
Preheat
HP
tank
HP
tank
HP
SH
HP
SH
Tank
SH
T
tank
B Boiler
HP Heat pump
HP
tank
Tank heating by heat pump
HP
SH
Space heating by heat pump
Tank
SH
Space heating by tank heating support
T
tank
Storage tank temperature
T
set
In this example: Tank setpoint (may differ depending on space heating setpoint)
T
B Off
Boiler off temperature (T
set
+3+[7‑0D])
T
HP on
HP tank heating ON temperature (Tank setpoint–[6‑00])
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
Tank free energy hysteresis
# Code Description
[9.O.2] [7‑0E] Range: 2°C~22°C (step: 0.5°C)
The tank free energy hysteresis defines the storage tank limit temperature, above
which heat pump and boiler is stopped in case solar energy is provided and solar
priority is active ([C‑00]=0).