Daikin Altherma EHYHBH05A Series - Flow Resistance Graph for Appliance Domestic Hot Water Circuit; Operation Modes

11 | Operation
Installer reference guide
191
EVLQ05+08CA + EHYHBH05A + EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
▪ during boiler only operation, and with the boiler in domestic hot water mode,
space heating will NOT be provided, but domestic hot water will.
▪ during simultaneous heat pump and boiler operation, the heat pump will provide
heat and the boiler will be bypassed and switch to domestic hot water mode to
provide domestic hot water.
This manual only explains the domestic hot water making without having a
domestic hot water tank combined with the system. For the operation and needed
settings of domestic hot water in combination with a domestic hot water tank
needed for Switzerland, please see the manual of the heat pump module.
INFORMATION
For EHY2KOMB28+32AA, prolonged instant domestic hot water operation at low
outdoor temperatures might be temporarily interrupted to protect the outdoor unit
and water piping from freezing.
11.3.1 Flow resistance graph for appliance domestic hot water circuit
Not applicable for Switzerland
0.2
0
1
3
5
7
9
11
13
15
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
bar
l/min
The minimum flow for domestic hot water operation is 1.5 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.
11.4 Operation modes
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.