TM_s-MEXT_ME28relC_00_12_19_EN
Technical manual
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
74
5
COOLING
5.1
COMMUNICATION WITH THE MR SLIM UNIT
During the management and control of Mr Slim units, it is necessary to use interface cards (PAC-IF013B-E), through which the s-MEXT unit will send commands and request
information from the Mr. Slim units.
There are 2 possible types of connections for the use of Mr Slim units, depending on the number of them being used with the s-MEXT unit.
The following diagrams identify the connections.
5.1.1
Connection to only one external Mr Slim unit
The connection, represented in the figure below, requires the internal unit (s-MEXT) to control through the RTU Modbus protocol the PAC-IF013B-E card, which will then
manage the Mr Slim external unit.
Figure 5-1:
Logic diagram for connection to 1 Mr. Slim unit
5.1.2
Connection to more than one external Mr Slim unit
With this connection, represented in the figure below, the internal unit (s-MEXT) controls through the RTU Modbus protocol the Master PAC-IF013B-E card, which will then
manage both the first external Mr Slim unit (address 0) and the Slave PAC-IF013B-E card.
The Slave PAC-IF013B-E card manages the second Mr Slim unit (address 1).
Figure 5-2:
Logic diagram for connection to 2 Mr. Slim unit
In this case, the PAC-IF013B-E Master card must be configured for the IMOUC function (Intelligent Multiple Outdoor Unit Control), independently managed by the PAC-
IF013B-E.
