Daikin Altherma EVLQ05+08CA, Installer'S Reference Manual

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9 | Operation
Installer reference guide
180
EHYH EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
9 Operation
9.1 Overview: Operation
The gas boiler is a modulating, high-efficiency boiler. This means that the power is
adjusted in line with the desired heat requirement. The aluminium heat exchanger
has 2 separate copper circuits. As a result of the separately constructed circuits for
space heating and domestic hot water, the heating and the hot water supply can
operate independently, but not simultaneously.
The gas boiler has an electronic boiler controller which does the following when
heating or hot water supply is required:
▪ starting the fan,
▪ opening the gas valve,
▪ igniting the burner,
▪ constantly monitoring and controlling the flame.
It is possible to use the domestic hot water circuit of the gas boiler without
connecting and filling the space heating system.
9.2 Heating
Heating is controlled by the indoor unit. The boiler will start-up the heating process
when there is a request from the indoor unit.
INFORMATION
For third-party gas boilers, prolonged boiler operation at low outdoor temperatures
might be temporarily interrupted to protect the outdoor unit and water piping from
freezing. During this temporary interruption the boiler might appear to be off.
9.3 Domestic hot water
Not applicable for Switzerland
Instant domestic hot water is supplied by the boiler. Because supplying domestic
hot water has priority over space heating, the boiler will switch to domestic hot
water mode whenever there is a hot water demand. When a simultaneous space
heating and domestic hot water demand occurs:
▪ during heat pump only operation (space heating mode), the heat pump will
provide heat while the boiler is bypassed and switches to domestic hot water
mode to provide domestic hot water.
▪ 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.