CONTROLLER FOR DISTRICT HEATING SUB-STATIONS
WITH A SINGLE HEAT EXCHANGER
OPTIONAL TELEMANAGEMENT 

XTT 618

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  • TELEMANAGEMENT : Enabled with ACB 400 accessory.

APPLICATION

Suitable for the control of district heating sub-stations comprising one heat exchanger with valve and secondary circuit pump.

  • Data communication with other controllers via connection.

Essential detectors:

  • 1 secondary flow sensor.

Optional accessories:

  • 1 outside sensor.

  • 1 primary flow sensor.

  • 1 primary return sensor.

  • 1 secondary return sensor.

FEATURES

  • Power supply: 230V~.

  • Consumption: 5VA.

  • DIN 105 x 115 modular enclosure.

  • Protection: IP 40.

  • Digital programming by means of 4 keys and alphanumeric display.

  • Control of secondary flow temperature:

    • At fixed point.

    • Compensated with correction of origin of heating curve.

    • Variable in relation to desired temp. pf heating zones ().

  • Modulating control (3-wire) of control valve of primary circuit heat exchanger.

  • Forced valve closure for:

    • Minimum opening limit.

    • Minimum flow or heat limit in primary circuit (from heat meter by means of voltage free switch).

  • Limited valve opening for:

    • Maximum opening limit.

    • Maximum limit flow or energy primary circuit (from heat meter by means of voltage free switch).

    • Maximum limit temperature difference between primary and secondary returns.

    • Maximum limit of primary circuit return temperature.

  • Minimum and maximum limit of secondary flow temperature.

  • On-Off control of secondary pump in relation to demand for heat.

  • Input for metering flow or energy for limits or On-Off alarm.

  • Input for measuring water loss or On-Off alarm.

  • Input for TeleOn or On-Off alarm.

  • Alarms for plant faults and for open or short sensor circuit.

  • Data recorder.

Code  

Description

Data sheet
XTT 618  

Controller for district heating sub-stations.

B 283
XTT 618/S1   Controller for district heating sub-stations (hight temperatures). B 283/S1

DETECTORS AND ACCESSORIES

Code   Description Application range

Sensing element

 Data sheet
ACB 400   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 (secondary flow, primary return) 0 ... 99 °C NTC 10 kΩ N 140
STH 001   Immersion temperature sensor (primary flow, primary return). 0 ... 300 °C Pt 1 kΩ N 140
SHF 001   Cable-type temperature sensor (primary flow & return). 0 ... 180 °C Pt 1 kΩ N 145