Honeywell Remote Heating Controller DHC Manual

Honeywell Remote Heating Controller DHC, Heating Controller SDC Manual

Software version

This documentation is valid for software version V 3.0 of your control device. The software version is displayed after switch-on for approx. 8 s. If you are using an older software version, please contact your heating technician. Pos: 2

Safety instructions

Intended use

The SDC / DHC Smile family of controllers was designed for the sole purpose of regulating and controlling hot-water, heating and district heating systems (including hot-water production) that do not exceed a maximum flow temperature of 120 °C.

Requirements for start-up

The heating system must be complete and filled with water so that the pumps do not run dry and the heating boiler is not
damaged. The control equipment must be installed in accordance with the installation instructions. All electrical connections (voltage supply, burner, mixer motor, pumps, sensor wiring etc.) must be carried out by the technician in accordance with the applicable VDE regulations and correspond with the circuit diagrams. If floor heating is connected, a limiting thermostat must also be installed in the flow line after the heating circuit pump. This switches off the pumps at excessive flow temperatures. Before starting up the controller, have the heating technician check all requirements listed above.

NOTE: The current time and date are already set at the factory and are backed up by a battery.

The time switch functions based on a basic program and the control functions are preset for common heating systems with lowtemperature boilers.

  • Power supply

Do not disconnect the controller from the mains supply! The battery for saving all individualised data is otherwise unnecessarily strained. The frost-protection function of the controller is deactivated.

  • Connection conditions

All electrical connection work may only be carried out by qualified personnel!

  • Cable cross-sections

1.5 mm2 for all cables carrying 230 V (power supply, burner, pumps, actuator). 0.6 mm2 for bus cables (recommended type J-Y(St)Y 2 x 0.6) 0.5 mm2 for sensors, selectors and analog signal cables.

  • Maximum cable lengths

Sensor, selector and analog inputs We recommend using cables no longer than 200 m. Longer connection lines could be used, but increase the risk of interference.
Relay outputs Unlimited cable length.
Bus connections Max. length of 100 m from the first bus subscriber to the last one (incl. wall modules).

  • Cable installation

Install cables for sensors apart from the cables carrying 230 V! Branch boxes in the sensor cable must be avoided!

  • Grounding and zeroing

Local regulations on the connection of equipment must be observed!

Honeywell Remote Heating Controller DHC Display (basic display)

Honeywell Remote Heating Controller DHC Display

  1. Day of the week / Date
  2. Time
  3. Active operating mode
  4. Heat generator temperature
  5. Operating mode symbols

The illumination of the display is switched on by pressing any button or using the input button and switches off automatically if no buttons are pressed for a longer period of time. During start-up of the unit and after a power failure, a segment test with automatic fault diagnosis is carried out. The respective device type and the software version number then appear briefly. The basic display that then appears shows the day of the week, the date, the time and the heat generator temperature in automatic mode. Different values appear in the basic display depending on the set operating mode (AUTOMATIC, PARTY etc.). Thus, for example, in the ABSENT operating mode, the indication ABSENT TIL appears instead of the date and the return date instead of the temperature. Active summer deactivation is indicated by a beach umbrella symbol, and active frost protection is indicated by a snowflake symbol.

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