COMPENSATING CONTROLLER FOR DISTRICT HEATING SUB-STATIONSWITH TWO HEAT EXCHANGERS OPTIONAL TELEMANAGEMENT  XTT 608
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• TELEMANAGEMENT : Enabled with ACB 460 accessory.

APPLICATION

Designed for the control of district heating substations comprising one heat exchanger Heating (modulating control) and one DHW heat exchanger (On-Off or modulating).

• Data communication with other controllers via serial connection.

Essential detectors:

• 1 heating flow sensor.

• 1 DHW storage tank sensor.

Optional accessories:

• 1 outside sensor.

• 1 room sensor.

• 1 primary return sensor.

• 1 heating return sensor.

• 1 DHW distribution 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 heating flow temperature:

  • At fixed point with desired flow temperatures Fixed Point 1-2.

  • Compensated with desired room temp. Normal 1…5, Setback 1-2, Frosprot.

  • Variable in relation to temperature requested by heating zones ( ).

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

• Forced valve closure for:

  • Minimum opening limit.

  • Minimum flow or heat limit in primary circuit (from heat meter).

• Limited valve opening for:

  • Maximum opening limit.

  • Maximum limit of temperature primary circuit return.

  • Maximum limit flow primary circuit.

  • Maximum limit temperature difference between primary and secondary returns.

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

• Timed programming with seven 24hour programs and two 7day programs.

• Functions:

  • Optimized start and stop; Eco off; Frosprot.

• Control of temperature DHW at fixed point (storage or distribution or storage & distribution):

  • Three-wire modulating control or On-Off valve primary circuit heat exchanger DHW.

  • Timed control DHW circulation pump.

  • Timed programming with seven 24hour programs and two 7day programs.

  • Antibacteria function.

• 25 annual periods with dates and separate programming for heating and DHW.

• Summer exercise function for valves and pumps.

• Automatic switching GMT – BST and summer/winter switching.

• Metering degree-days.

• Input for measurement flow or input for On-Off alarm

• Input for program changing switch or input for On-Off alarm.

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

• Data recorder.

Code		Description	Data sheet
XTT 608		Optimising compensator for district heating.	B 284
ACB 460		Plug-in for communication via .	-

SONDE E ACCESSORI