1
E 136 - XTA 624 C1 Eng.
22.11.10 AM
REV. 02
We reserve the right to make changes without notice
COSTER
XTA 624
C1
Eng.
• Temperature control in air handling units
• Communication systems :
– C-Bus : XTA 624 Telemanagement optional;
to enable Telemanagement use the "
C-Bus Plug-in" type
ACB 400 C1 or later
,
to be ordered separately as accessory.
• 24 V ~ power supply; DIN rail mounting
1. APPLICATION
XTA 624 is designed for temperature 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 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. OPERATION
The main features of XTA 624 are as follows:
• Two 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.
– flow temperature control (heating or cooling) with winter and summer compensation if desired
– pre-heating temperature control at a fixed value
• One 0...10 V– progressive output, configurable for:
– air mixing control based on temperature comparison or with minimum external air limit
– heat recuperator On-Off control according to room-external temperature comparison
• 2 pump control On-Off outputs accoring to output load
• Manual seasonal switching from a display or an external switch.
• Remote-controlled temperature setting adjustment
• Alarms for short and open detector circuits and for system and equipment malfunction.
• Programming by means of 25 24-hour programs, five 7-day programs, and 25 annual period programs
• Enabled for data transmission via C-Bus with local PCs or remote Telemanagement PC.
• Optional C-Bus transmission of data with local PCs or remote Telemanagement PC.
To enable data transmission and Telemanagement use the “C-Bus Plug-in” type ACB 400 C1 or later
To communicate locally with a PC use the test Plug-in type ACX 232
3. ACCESSORIES
No.
Description
Type
Application range
Sensing
Code
Data
element
sheet
1
Duct flow air temperature detector
STA 010
0…60 °C
NTC 10 k
Ω
B1
–
1
Duct outside air temperature detector
STA 001
–30…+40 °C
NTC 1 k
Ω
B2
–
or
wall outside air temperature detector
SAE 001
–30…+40 °C
NTC 1 k
Ω
B2
–
1
Duct extract air temperature detector
STA 010
0…40 °C
NTC 10 k
Ω
B3
–
or
room air temperature detector
SAB 010
0…40 °C
NTC 10 k
Ω
B3
–
1
Duct pre-heating temperature detector
STA 010
0…40 °C
NTC 10 k
Ω
B4
–
1
Temperature set-point adjuster
CDB 100
± 5 °C
–
Rt°
–
1
Outside air minimum distance positioner
PCS 04
–
–
Rs
–
Accessory for Telemanagement
1
Plug-in for communicating via C-Bus
ACB 400 C1
–
–
–
E 136
22.11.10 AM
REV. 02
BUS
C
OPTIONAL
TEMPERATURE CONTROLLER FOR TWO-BATTERY
AIR HANDLING UNIT
