Flow Resistance Graph For Appliance Domestic Hot Water Circuit; Operation Modes - Daikin Altherma H Hybrid EJHA04AAV3 Installer's Reference Manual

12.3.1 Flow resistance graph for appliance domestic hot water circuit

12.4 Operation modes

EJHA04AAV3 + EHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P531180-1D – 2025.03
Not applicable for Switzerland
l/min
15
13
11
9
7
5
3
1
0.2 0.4 0.6 0.8
0
A 28 kW
B 32 kW
The minimum flow for domestic hot water operation is 2 l/min. The minimum
pressure is 0.1 bar. A low flow (<5 l/min) can reduce comfort. Make sure to set the
setpoint high enough.
The following codes on the service display indicate the following operating modes.
Off
The gas boiler is out of operation but is supplied with electric power. There will be
no response on space heating and/or domestic hot water demands. Frost
protection is active. This means that the exchanger is heated up if the water
temperature in the gas boiler is too low. If applicable, the keep hot function will
also be active.
If frost protection or keep hot function is activated, will be displayed (heating the
exchanger). In this mode, the pressure (bar) in the space heating installation can be
read on the main display.
Waiting mode (blank service display)
The LED at the button is lit and possibly also one of the LEDs for the domestic hot
water comfort function. The gas boiler is waiting for a space heating and/or
domestic hot water demand.
Pump overrun of space heating
After each space heating operation, the pump continues to run. This function is
controlled by the outdoor unit.
Boiler shutdown when the required temperature is reached
The boiler controller can temporarily stop the requested space heating demand.
The burner will stop. The shutdown occurs because the requested temperature is
reached. When the temperature drops too fast and the anti-cycle time has passed,
the shutdown will be cancelled.
Self-test
The sensors check the boiler controller. During the check-up, the boiler controller
does NOT perform any other tasks.
B
A
bar
1.0 1.2 1.4 1.6 1.8 2.0
12 Operation
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Installer reference guide
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