Daikin D2C20ND028A5AA [2/24] Introduction 2
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Daikin D2C20ND028A5AA [2/24] Introduction 2

Daikin D2C20ND028A5AA [2/24] Introduction 2
Table of Contents
Operation manual
2
D2C20ND028A5AA + D2C24ND035A5AA
Wall-mounted condensing boiler
3P469438-10H – 2018.05
Table of Contents
1 Introduction 2
1.1 About the unit ............................................................................ 2
1.2 About the documentation .......................................................... 2
1.2.1 Meaning of warnings and symbols.............................. 2
2 Safety instructions 2
2.1 Installation ................................................................................. 2
2.2 Smell of gas............................................................................... 3
2.3 Modifications on the unit............................................................ 3
2.4 Gas conversion ......................................................................... 3
2.5 For the user ............................................................................... 3
3 Operation 3
3.1 User interface ............................................................................ 3
3.1.1 Buttons and dials ........................................................ 3
3.1.2 LCD screen................................................................. 4
3.1.3 Status indicator ........................................................... 4
3.2 Operating the unit...................................................................... 4
3.2.1 To switch ON the unit.................................................. 4
3.2.2 About the low water temperature function .................. 4
3.2.3 About the electronic gas adaptive system calibration. 4
3.3 Basic usage............................................................................... 5
3.3.1 About the home screen............................................... 5
3.3.2 To select the operation mode ..................................... 5
3.3.3 Possible operation modes........................................... 5
3.3.4 Changing temperature setpoints................................. 5
3.3.5 Possible central heating operation modes.................. 6
3.3.6 About the central heating ECO mode ......................... 6
3.3.7 About the domestic hot water operation ..................... 6
3.3.8 About the domestic hot water comfort mode .............. 7
3.3.9 About the boiler frost protection.................................. 7
3.3.10 About Energy Metering Function ................................ 7
3.4 Error handling............................................................................ 7
3.5 Menu functions .......................................................................... 7
3.5.1 To use menu level 1.................................................... 7
3.5.2 Info menu.................................................................... 8
3.5.3 User settings menu..................................................... 8
3.5.4 Installer settings menu................................................ 9
4 Maintenance and cleaning 10
4.1 To clean the outer surface of the unit........................................ 10
5 Energy saving tips 10
6 Contact 10
7 Error codes 10
1 Introduction
1.1 About the unit
This Daikin unit is a wall-mounted gas-fired condensing boiler that
can supply heat to central heating systems, as well as supply
domestic hot water. Depending on settings, it is possible to use the
unit solely for hot water or solely for central heating. Hot water
supply type can be instantaneous or by means of a hot water
storage tank. Heating only boilers do not supply domestic hot
water. The type of the boiler can be recognised from the model
name written on the identification label, which is located at the right
cover of the unit. See table below:
Model Type Domestic hot water
supply
D2C20ND028A5AA D2C20ND028 Instantaneous
D2C24ND035A5AA D2C24ND035 Instantaneous
A control unit, which contains a user interface, controls the ignition,
safety systems, and other actuators. User interaction is provided via
that user interface, which is composed of an LCD screen, push
buttons, and two dials, and which is located on the front cover of the
unit.
1.2 About the documentation
The instructions contained in this document are intended to guide
you through the operation of the unit. Damage caused by non-
observance of these instructions are not under the responsibility of
Daikin.
▪ The original documentation is written in English. All other
languages are translations.
▪ The precautions described in this document are written for users
and cover very important topics, follow them carefully.
▪ Please read the instructions in the manual carefully, for your
safety and health.
▪ Please keep this manual for future reference throughout the unit's
period of use.
▪ Request the installer to inform you about the settings that he
made to configure your system.
1.2.1 Meaning of warnings and symbols
DANGER
Indicates a situation that results in death or serious injury.
WARNING
Indicates a situation that could result in death or serious
injury.
CAUTION
Indicates a situation that could result in minor or moderate
injury.
NOTICE
Indicates a situation that could result in equipment or
property damage.
INFORMATION
Indicates useful tips or additional information.
2 Safety instructions
Always observe the following safety instructions and regulations.
2.1 Installation
WARNING
Installation, service, maintenance and repair of the boiler
can only be carried out by suitably qualified competent
persons, in accordance with the applicable legislation,
regulations, rules and guidelines.
WARNING
The unit may only be operated with its casing properly
mounted. Otherwise, in unfavourable conditions, material
damage or even injury or death can result.
CAUTION
A discharge pipe must be connected to the condensate
trap in order to prevent contact with the condensate.

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