Coster RTU 644 Manual

TEMPERATURE AND HUMIDITY CONTROLLER
FOR TWO-BATTERY AIR HANDLING UNIT
C BUS
RTU 644
Eng. C2
• Temperature and relative humidity control in air handling units
• Power supply 24 V~ , DIN rail mounting
1. APPLICATION
RTU 644 is designed for temperature and humidity control in air handling units composed of:
• 2 hot/chilled water or vapor batteries 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
or
• 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).
2. FEATURES
The main features of RTU 644 are as follows:
• Three 3-wire modulating outputs 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
– room relative humidity control – humidifying (flow limits, alternative to enthalpic comparison, if desired) and
dehumidifying
• 1 0...10 V– progressive output, configurable for:
– air mixing control based on temperature or enthalpic 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
• Manual or automatic controller function seasonal switching.
• Remote-controlled temperature and humidity setting adjustment
• Alarms for short and open detector circuits and for faulty microprocessor.
3. ACCESSORIES
No. Description
1 Duct flow air temperature detector
1 Duct outside air temperature detector
or wall outside air temperature detector SAE 001
1 Duct extract air temperature detector
or or room air temperature detector
1 Duct pre-heating temperature detector
or duct relative humidity detector
1 Room relative humidity and temperature detector
or duct relative humidity detector
or duct relative humidity detector (swimming pools) SUR 051
1 0...10 V– to 2-stage On-Off Duct converter
1 Modulating to 0...10 V– converter
1 Temperature set-point adjuster
1 Relative humidity set-point adjuster
1 Outside air minimum distance positioner
We reserve the right to make changes without notice
COSTER
vapor-operated, with 3-wire modulating control, or 1- or 2-stage On-Off co
vapor-operated, with 0...10 V– control (alternative to air damper control)
Type Application range
STA 010
–30...+40 °C
STA 001
–30...+40 °C
STA 010
SAB 010
STA 010
STV 010
0...40 °C ; 20...80 %
SAU 012
SUR 012
CSV 304
CSC 304
CDB 100
CDB 200
PCS 04
E 132 - RTU 644
Sensing
element t°
0...60 °C
NTC 10 kΩ
NTC 1 kΩ
NTC 1 kΩ
0...40 °C
NTC 10 kΩ
0...40 °C
NTC 10 kΩ
0...40 °C
NTC 10 kΩ
0...40 °C
NTC 10 kΩ
NTC 10 kΩ
20...80 % –
10...90 % –
– –
– –
– –
– –
– –
C2 Eng. 06.05.01
E 132
06.05.01
Code Data
sheet
B1 –
B2 –
B2 –
B3 –
B3 –
B4 –
B4 –
B3-B6 –
B6-B7 –
B6-B7 –
U1 –
U2 –
Rt° –
RH –
Rs –
1