TEMPERATURE & HUMIDITY CONTROLLER FOR 2-BATTERY AIR-HANDLING UNITS OPTIONAL TELEMANAGEMENT  XTU 644
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APPLICATION

For control of temperature and humidity of room and/or discharge air in air-handling units comprising:

• 1 or 2 batteries for heating and/or cooling.

• 1 modulating or On-Off humidification battery.

• 1 air mixing unit or 1 heat regenerator.

Essential detectors:

• 1 room or air duct temperature sensor.

Optional accessories:

• 1 flow temperature sensor.

• 1 pre-heating temperature sensor.

• 1 outside temperature sensor.

• 1 room or air duct humidity sensor.

• 1 outside humidity sensor.

• 1 window dew-point sensor.

• 1 temperature set-point adjuster.

• 1 humidity set-point adjuster.

FEATURES

• Power supply: 24V~.

• Consumption: 5VA.

• DIN 105 x 115 modular enclosure.

• Protection: IP 40.

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

• Three 3-wire modulating outputs or On-Off in two stages (2 equal loads) or in three stages (2 unequal loads) configurable for:

  • control of room temperature in relation to heating and cooling values requested with, if required, summer outside compensation, minimum and maximum limits of flow in order to avoid cold air currents, stratification of warm air and condensing in the air ducts.

  • control of flow temperature in relation to heating and cooling values requested with, if required, winter and summer compensation.

  • control of pre-heating temperature at a value variable in relation to room temperature and humidity.

  • control of room relative humidity in relation to humidification & dehumidification values requested.

• One progressive 0 ... 10V- output configurable for:

  • control of air mixture in relation to room-outside temperature (free cooling) or an enthalpic comparison.

  • control of outside air for controlling room dehumidification with compensation for window dew point.

  • control of heat regenerator in relation comparison room – outside temperatures.

• Manual or automatic season switching of the controller functions and of the three-wire On-Off season control.

• Variation of temperature & humidity set points by means of remote control.

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

Code		Description	Data sheet
XTU 644		Temperature & humidity controller for 2-battery air-handling unit.	E 135
ACB 460		Plug-in per comunicazione via .	-

DETECTORS & ACCESSORIES