8 Configuration
Installer reference guide
58
ERLQ004~008CAV3 + EHBH/X04+08CA
Daikin Altherma - Low Temperature Split
4P313774-1C – 2012.11
Booster heater and heat pump operation
For systems with separate domestic hot water tank (only for
EHBH/X)
# Code Description
N/A [4-03] Defines the operation permission of the
booster heater depending on ambient,
domestic hot water temperature or
operation mode of heat pump. This
setting is only applicable in reheat mode
for applications with separate domestic
hot water tank.
▪ 0: Booster heater operation is NOT
allowed except for "Disinfection
function" and "Powerful domestic
water heating".
Only use this in case the capacity of
the heat pump can cover the heating
requirements of the house and
domestic hot water over the complete
heating season.
If the outdoor temperature is below
setting [5-03] and [5-02]=1, the
domestic hot water will not be heated.
The domestic hot water temperature
can be maximum the heat pump OFF
temperature.
▪ 1: Booster heater operation is allowed
when required.
▪ 2: The booster heater is allowed
outside the operation range of the heat
pump for domestic hot water
operation.
Booster heater operation is only
allowed if:
▪ Ambient temperature is out of the
operating range: T
a
<[5-03] or
T
a
>35°C
▪ Domestic hot water temperature is
2°C lower than the heat pump OFF
temperature.
The booster heater will be allowed to
operate when T
a
<[5-03] depends of the
status of [5-02].
If bivalent operation is enabled and
permission signal for auxiliary boiler is
ON, the booster heater will be restricted
even when T
a
<[5-03]. See [C-02].
▪ 3 (default): The booster heater is
allowed when the heat pump is NOT
active in domestic hot water operation.
Same as setting 1, but simultaneous
heat pump domestic hot water
operation and booster heater
operation is not allowed.
When setting [4-03]=1/2/3, the booster
heater operation can still be restricted by
the booster heater allowance schedule.
N/A [7-00] Overshoot temperature. Temperature
difference above the domestic hot water
set point temperature before the booster
heater is turned OFF. The domestic hot
water tank temperature will increase with
[7-00] above selected temperature
set point.
Range: 0~4°C (default: 0)
N/A [7-01] Hysteresis. Temperature difference
between booster heater ON and booster
heater OFF temperature. The minimum
hysteresis temperature is 2°C.
Range: 2~40°C (default: 2)
# Code Description
N/A [6-00] The temperature difference determining
the heat pump ON temperature.
Range: 2~20°C (default: 2)
N/A [6-01] The temperature difference determining
the heat pump OFF temperature.
Range: 0~10°C (default: 2)
BH Booster heater
HP Heat pump. If heating up time by the heat pump
takes too long, auxiliary heating by the booster
heater can take place
T
BH OFF
Booster heater OFF temperature (T
U
+[7-00])
T
BH ON
Booster heater ON temperature (T
BH OFF
−[7-01])
T
HP MAX
Maximum heat pump temperature at sensor in
domestic hot water tank
T
HP OFF
Heat pump OFF temperature (T
HP MAX
−[6-01])
T
HP ON
Heat pump ON temperature (T
HP OFF
−[6-00])
T
DHW
Domestic hot water temperature
T
U
User set point temperature (as set on the user
interface)
t Time
Timers
# Code Description
N/A [8-00] Minimum running time for domestic hot
water operation. During this time, space
heating/cooling is NOT allowed, even
when the target domestic hot water
temperature has been reached.
Range: 0~20 minutes (default: 5)
N/A [8-01] Maximum running time for domestic hot
water operation. Domestic hot water
heating stops even when the target
domestic hot water temperature is NOT
reached. The actual maximum running
time also depends on setting [8-04].
▪ When system layout = Room
thermostat control: This preset value is
only taken into account if there is a
request for space heating or cooling. If
there is NO request for space heating/
cooling, the tank is heated until heat
pump OFF temperature.
▪ When system layout ≠ Room
thermostat control: This preset value is
always taken into account.
Range: 5~95 minutes (default: 30)
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