COMPENSASTING OPTIMISER FOR BURNERS
OF ANY TYPE INCLUDING SEQUENCING,
OF SEVERAL BOILERS

XTC 638

 clicca sull'immagine per ingrandire

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  • TELEMANAGEMENT : Enabled using ACB 400 accessory.

APPLICATION

Designed for sequencing two boilers with one- or two-stage burners and shut-off valves. Control of primary manifold temperature with temperature measurement by means of a sensor on manifold or two sensors on the boilers..

  • Communication with other controllers via serial C-Ring protocol.

Essential detectors:

  • 1 temperature sensor on manifold or 2 boiler sensors

Optional accessories:

  • 1 outside sensor.

FEATURES

  • Power supply: 230V~;

  • Consumption: 5VA;

  • DIN 105 X 115 modular enclosure;

  • Protection: IP 40.

  • Digital programming by means of four keys and alphanumeric display.

  • Setting dates of heating season and automatic switching GMT – BST.Seven 24hour periods and two 7day programs.

  • 25 holiday programs and one special period with dates.

  • Control of zone temperature:

    • Fixed point;

    • Variable in relation to outside temperature;

    • Variable in relation to temperature requested by consumer zones.

  • Sequencing: manual switching from display or timed automatic.
  • Automatic inversion of sequence in event of lockout of lead boiler.
  • Enabling of lag boiler according to mean temperature of zone.
  • Digital control of burners and of valves with adjustable delay closure.
  • Theoretical metering of burner operating hours.
  • Two inputs for measurement and alarms for flue gas temperature and for lockout burners. 
  • Three digital alarm inputs. 
  • Alarms for plant faults and for open or short sensor circuit.
Code  

Description

Data sheet
XTC 638  

Temperature controller for a modulating boiler, for several boiler in sequence and other functions

A 610

DETECTORS AND ACCESSORIES

Code   Description Application range

Sensing element

 Data sheet
ACB 460   Plug-in for communicating via . - - T 433
SAE 001   Outside temperature sensor. -40 ... 40 °C NTC 1 kΩ N 120
SIH 010   Immersion temperature sensor. 0 ... 99 °C NTC 10 kΩ N 140
SCH 010   Surface temperature sensor   NTC 10 kΩ N 130
SAB 010   Room temperature sensor 0 ... 40 °C NTC 10 kΩ N 111
STF 001   Flue gases temperature sensor. 0 ... 500 °C Pt 1 kΩ N 165