oxycom 3800OXYSTD, Manual

Page: 39 / 68

Prepare the location
Version 1.3, 2021-12-14 39
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- Power supply to the external fuse.
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4x0.75 mm
2
(shielded) cabling to and between OxyConnect the thermostats
and the IntrCooll®s.
Note
The gateway control box must be placed indoors.
3.16.3 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.
3.16.4 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)
3.16.4.1 Modbus RTU (RS485)
Controller I/0 I/0 type I/0 function Protocol Connection type Connection
J17 Isolated RS485 port Modbus control Modbus RTU 2-wire
Pin 1) A-
Pin 3) B+
3.16.4.2 Analog control (6-wire cable)
Controller I/0 I/0 type I/0 function Signal type Connection type Connection
J6 Analog input Fan speed input 0-10V
0 V = 0% fan speed
2-wire
Pin 1) 0 V
10 V = 100% fan speed Pin 3) 0 V - 10
V input
J12 Digital input Cooling On/Off
Off (no circuit) = Free Cooling
2-wire
Pin 1) +24
VDC output
On (circuit) = Cooling Pin 3) Input
J23 Potential free contact Alarm contact N.O.
Open (no circuit) = No alarm
2-wire
Pin 1) N.O.
Closed (circuit) = Active alarm Pin 2) P
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.