oxycom IntrCooll Std. Manual page 39

3.16.3
3.16.4
3.16.4.1
Controller I/0 I/0 type
J17 Isolated RS485 port
3.16.4.2
Controller I/0 I/0 type
J6 Analog input
J12 Digital input
J23 Potential free contact
Version 1.3, 2021-12-14
- Power supply to the external fuse.
- 2
4x0.75 mm (shielded) cabling to and between OxyConnect the thermostats
and the IntrCooll®s.
Note
The gateway control box must be placed indoors.
Control by a Building Management System
IntrCooll® can be connected to a Modbus RTU (RS485) Building Management
System (BMS) as slave device.
The contractor must take care of the control system that regulates the
temperature control, fan speed and operation mode.
The Modbus interface information is available in a separate document. This can
be requested at Oxycom.
Control by an air handling unit
For pre-cooling purposes, the IntrCooll® can be controlled by and synchronized
with an air handling unit (AHU). There are two different control options:
- Modbus RTU (RS485)
- Analog control (6 wire cable)
Modbus RTU (RS485)
I/0 function Protocol
Modbus control Modbus RTU
Analog control (6-wire cable)
I/0 function Signal type
0 V = 0% fan speed
Fan speed input 0-10V
10 V = 100% fan speed
Off (no circuit) = Free Cooling
Cooling On/Off
On (circuit) = Cooling
Open (no circuit) = No alarm
Alarm contact N.O.
Closed (circuit) = Active alarm
For the analog control method IntrCooll® PCB must switched to AHU Pre-cooling
mode. The following will apply:
- J6: When the speed input signal of the external fan is less than 0.2V the unit
will go to stand-by.
Prepare the location
Connection type Connection
Pin 1) A-
2-wire
Pin 3) B+
Connection type Connection
Pin 1) 0 V
2-wire
Pin 3) 0 V - 10
V input
Pin 1) +24
VDC output
2-wire
Pin 3) Input
Pin 1) N.O.
2-wire
Pin 2) P
1
2
3
4
5
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