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Daikin EHY2KOMB32AA — установка и эксплуатация газового котла: руководство пользователя [31/48]

8 Operation

Installation and operation manual

EHY2KOMB28+32AA

Daikin Altherma H Hybrid – Gas boiler module

4P538953-1A – 2020.02

7 Put the front panel back in its place.

8 Operation

8.1 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.

8.2 Heating

Heating is controlled by the outdoor unit. The boiler will start-up the

heating process when there is a request from the outdoor 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.

8.3 Domestic hot water

Not applicable for Switzerland

Instant domestic hot water is supplied by the boiler. When a

simultaneous demand of space heating and domestic hot water

occurs, domestic hot water has priority over space heating.

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.

8.4 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.

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.

Ventilation

When the appliance is started, the fan goes to starting speed. When

the starting speed is reached, the burner is lit. The code will also be

visible when post-ventilation is taking place after the burner has

stopped.

Ignition

When the fan has reached its starting speed, the burner is ignited by

means of electric sparks. During ignition the code will be visible on

the service display. If the burner does NOT ignite, a new ignition

attempt occurs after 15 seconds. If after 4 ignition attempts the

burner is NOT yet burning, the boiler will go into fault mode.

Domestic hot water operation

Not applicable for Switzerland

The domestic hot water supply has priority over space heating

performed by the gas boiler. If the flow sensor detects a domestic

hot water demand of more than 2 l/min, space heating by the gas

boiler will be interrupted. After the fan has reached speed code and

ignition is done, the boiler controller goes into domestic hot water

mode.

During the domestic hot water operation, the fan speed and hence

the appliance power are controlled by the gas boiler controller so

that the domestic hot water temperature reaches the domestic hot

water temperature setting.

The domestic hot water supply temperature must be set on the user

interface of the hybrid module. See the user reference guide for

more details.

Domestic hot water comfort function/Frost protection/Keep

hot function

Not applicable for Switzerland

appears on the display when either the domestic hot water comfort

function, the frost protection function or the keep hot function is

active.

space heating operation

When a space heating request is received from the outdoor unit, the

fan is started, followed by the ignition, and the space heating

operation mode. During the space heating operation, the fan speed

and hence the appliance power are controlled by the gas boiler

controller so that the space heating water temperature reaches the

desired space heating supply temperature. During the space heating

operation, the requested space heating supply temperature is

indicated on the operating panel.

Daikin EHY2KOMB32AA — установка и эксплуатация газового котла: руководство пользователя [31/48]

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