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E 121 - DTU 614 C2 Eng. 04.07.01
We reserve the right to make changes without notice
COSTER
TEMPERATURE AND HUMIDITY CONTROLLER
FOR ONE-BATTERY AIR HANDLING UNIT
DTU 614
C2 Eng.
• Temperature and relative humidity control in air handling units
• 24-hour, 7-day, and yearly period programming
• Communication systems:
– telemanagement C-Bus
• 24 V power supply; DIN rail mounting
1. APPLICATION
DTU 614 is designed for temperature and humidity control in air handling units composed of:
• 1 hot/chilled water or vapor battery with 3-wire modulating control
or electric batteries with 1-,2-, or 3-stage On-Off control
or direct expansion batteries with 1- or 2-stage On-Off control
• 1 adiabatic humidifying unit with On-off control
or vapor-operated, with 0...10 V– control (alternative to air damper control)
• 1 air mixing unit with 0...10 V– air damper actuators
or 1 heat recuperator with 0...10 V– or On-Off control (CSV 304 converter).
The equipment can be included in a Telemanagement system through the C-Bus connection.
2. FEATURES
The main features of DTU 614 are as follows:
• One 3-wire modulating output, or 2-stage On-off (two equal loads) or 3-stage (two unequal loads) outputs,
configurable for:
– room temperature control (heating or cooling) with summer external compensation if desired, minimum
and maximum flow limits to prevent cold drafts, hot air stratification and condensing in the air ducts.
– flow temperature control (heating or cooling) with winter and summer compensation if desired
– pre-heating temperature control at variable values according to room temperature and humidity
– battery antifreeze temperature control
– One On-off output for winter adiabatic humidifying unit control
• One 0...10 V– progressive output, configurable for:
– air mixing control based on temperature comparison, with minimum external air limit
– external air control for room dehumidification with compensation of dew temperature on glass windows and
with minimum external air limit
– heat recuperator On-Off control according to room-external temperature comparison
– vapor-operated humidifier setting by means of a 0...10 V– control
• One 3-wire On-Off output for manual or automatic seasonal switching.
• Two On-Off outputs for fan and pump control according to time setting in use
• Winter battery frostprotection temperature control
• Time setting including 25 24-hour programs, 5 7-day programs, and 25 yearly period programs
• Alarms for detector short and open circuits and for system and equipment malfunction.
C BUS
3. ACCESSORIES
No. Description Type Application Range Sensing element t° Code Data sheet
1 Duct flow air temperature detector STA 010 0…60 °C NTC 10 kΩ B1 –
1 Duct outside air temperature detector STA 001 –30…+40 °C NTC 1 kΩ B2 –
or wall outside air temperature detector SAE 001 –30…+40 °C NTC 1 kΩ B2 –
1 Duct extract air temperature detector STA 010 0…40 °C NTC 10 kΩ B3 –
or room air temperature detector SAB 010 0…40 °C NTC 10 kΩ B3 –
1 Duct pre-heating temperature detector STA 010 0…40 °C NTC 10 kΩ B4 –
or dew point temperature detector STV 010 0…40 °C NTC 10 kΩ B4 –
1 Room relative humidity and temperature detector SAU 012 0…40 °C ; 20…80 % NTC 10 kΩ B3-B6 –
or duct relative humidity detector SUR 012 20…80 % – B6 –
or duct relative humidity detector (swimming pools) SUR 051 10…90 % – B6 –
1 Battery frostprotection temperature detector – flush SAF 010 0…40 °C NTC 10 kΩ B7 –
or immersed SIH 010 0…40 °C NTC 10 kΩ B7 –
1 0…10 V – to 2-stage On-Off Duct converter CSV 304 ––U1–
1 Temperature set-point adjuster CDB 100 ± 5 °C–Rt°–
1 Relative humidity set-point adjuster CDB 200 ± 5 %H – RH –
1 Outside air minimum distance positioner PCS 04 ––Rs–
E 121
04.07.01
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