Weather compensated controller WDC20

Presentation

WDC20 weather compensated controllers are intended for the control of room heating or cooling in more demanding systems and domestic hot water preparation with solar system.

Radiator room heating system control.
Floor heating or cooling system control.
Convector heating or cooling system control.
Wall or ceiling heating or cooling system control.
Domestic hot water heating.

Features

52 preset hydraulic schemes.
Room heating or cooling according to the time programme.
Domestic hot water heating according to the time programme.
Solar system domestic hot water heating.
Control of heating systems with a storage tank.
The possibility of connecting 2 room units.
BOOST function for intense room heating.
Integrated solar system protection features.
13-language user interface.
Wizard for an easy and quick device start-up.
Notifications on the activated protection functions and warnings about system failures.
Possibility to simulate sensors and analyse the system operation.
Remote control with the help of the SeltronHome system.

Documentation

Download

Technical Data Sheet - EN (PDF)

Outlined functions

Start-up wizard

The WDD controller is equipped with a start-up wizard, which takes you through the initial setup of the controller in 3 or 4 steps.

Step 1: language selection.
Step 2: hydraulic scheme selection.
Step 3: setting the heating curve for the first heating circuit.
Step 4: setting the heating curve for the second heating circuit.

The WDC controller provides the connection of RCD room units. The room unit provides measurements of room temperature, selection of operation mode and setting of daytime and nighttime temperatures. Up to two room units may be connected to one WCD controller.

WDC BUS connection of multiple controllers

A random number of WDC controllers can be interconnected with the BUS connection. The master controller controls heat sources and heating circuits, meanwhile the slave controllers only control heating circuits. The outdoor sensor and the boiler temperature sensor are connected to the master controller.

WXD Remote control with the help of SeltronHome system

The WDC controllers may be connected to the SeltronHome platform, which provides the heating remote control using a smartphone or tablet. Remote control is enabled through the CLAUSIUS application for the end user and the KELVIN app for service technicians. The CLAUSIUS application provides the adaptation of the heating to our lifestyle, which leads to greater comfort and reduced heating expenses.

Typical hydraulic scheme

Oil boiler, 2 mixing circuits, domestic hot water storage tank.

Example: hydraulic scheme 423.

Technical data

Tehnični podatki	WDC20
Backlit graphic display
Operating hours meter
Weekly program timer
Connection voltage	230 V~, 50 Hz
Own consumption	2.5 W
Standby power consumption	Max. 0.5 W
No. of inputs	7 pcs temperature sensor (Pt 1000)
No. of outputs	7 pcs mechanical 1 pc electronic 2 pcs PWM or analogue 0÷10 V (Y1, Y2)
Relay outputs	4 (1) A ~, 230 V~
Triac outputs	1 (1) A ~, 230 V~
Power supply of built-in clock	Battery CR2032 (Li-Mn) 3 V
Accuracy of built-in clock	+/-1 s (24 h) at 20 °C
Degree of protection	IP20 according to EN 60529
Safety class	I according to EN 60730-1
Operation mode	1B according to EN 60730-1
Type of temperature sensors	Pt1000 or KTY10
Operation mode	3-point PID
Housing material	ASA – thermoplastic
Permissible ambient temperature	5÷40 °C
Storage temperature	-20÷65 °C
Product weight	450 g
Number of pieces in a package unit	6 pieces
Dimensions
Electrical connection

Performance comparison

	WDC10B	WDC10	WDC20
Application
Radiator room heating system control
Floor heating or cooling system control
Convector heating or cooling system control
Wall or ceiling heating or cooling system control
Domestic hot water heating
Technical characteristics
No. of preset hydraulic schemes	7	17	52
No. of room units	2	2	2
No. of mechanical relays	6	6	7
Number of electronic relays	—	1	1
No. of analogue outputs (0÷10 V or PWM) for the control of the circulation pump or an energy source	2	2	2
No. of temperature sensor inputs	7	7	7
BUS option – the interconnection of WDC controllers and connection with other Seltron controllers
System control
Control of a heating system with radiators
Floor heating or cooling system control
Convector heating or cooling system control
Wall or ceiling heating or cooling system control
Domestic hot water heating system control
Heating circuits control
Direct circuit
Mixing circuit
Direct and mixing circuit	—
Two mixing circuits	—	—
Domestic hot water heating
Switchover between direct heating circuit and domestic hot water heating
Domestic hot water circulation
Automatic switchover between heat sources	—	—
Control of the supply line constant temperature
Single-stage storage tank loading	—	—
Heat source control
Solid fuel boiler
Solid fuel boiler with a pellet burner	—	—
Liquid fuel boiler
Liquid fuel boiler with a two-stage burner
Combined boiler	—	—
Gas flow boiler	—	—
Heat pump	—	—
Storage tank
Auxiliary heating with electricity
Solar collectors	—
Domestic hot water heating
With a primary heating source
With a storage tank
Using a solar system	—
User functions
Room heating or cooling according to the time programme
Automatic winter/summer mode switchover
PARTY function – activation of the comfort operation mode
ECO function – activation of the economy operation mode
HOLIDAY function – activation of the operation mode during the holiday season
Domestic hot water heating according to the time programme
One-time domestic hot water heating
BOOST function for intense room heating
Function for screed drying
Heating system protection
Anti-legionella protection (for a controlled energy source)
Storage tank overheating protection
Boiler overheating protection
Collector frost protection	—
Forced pump start at the highest collector temperature	—
Switching off of the pump when the safety temperature has been exceeded	—
Solar system protection when collectors are overheating	—
Storage tank recooling to the desired temperature	—
Periodic start of the pump and mixing valve during a period of inactivity
A comprehensive overview of the heating system operation
Graphic display of temperatures according to days of the last week
Detailed display of temperatures for the current day
Notifications on the activated protection functions and warnings about system failures
Possibility to simulate sensors and analyse the system operation.
Remote access
With a separate dedicated cable, the controller can be connected to a computer
Possibility of connectivity to the SeltronHome platform, which allows remote control via a smartphone or tablet
Setup and installation
Wizard for an easy and quick device start-up
13-language user interface
Languages: EN, DE, FR, NL, PL, ES, SL, IT, CS, LT, GR, HU, HR
Setting up the operation by selecting the hydraulic scheme
“Help” button for quick help with the setup
Graphically adjustable time programmes
Option to simulate the system operation
Logging and display of changes made to the setup
Option for retrieval of the basic setup in the event of data loss or unwanted changes
Option for programming free outputs
Possibility of wall or DIN rail installation
Simple installation and connection