EN/07.2013/58/53
In the next figure the connection is shown.
4.8. Sequencing
The parameters involved are:
• S01 COOLING SET POINT: pre-set= 25°C
• S03 HEATING SET POINT: pre-set= 15°C
• S06 COOLING BAND: pre-set= 5°C
• S07 HEATING BAND: pre-set= 5°C
• M01 AUTOMATIC LEAD LAG ADDRESS: pre-set = 0
• M03 NUMBER OF PRESENT UNITS: pre-set = 1
• M04 MAX NUMBER OF UNITS ON: pre-set = 1
• M05 ROTATION HOUR SETTING: pre-set = 24h
• M06 LEAD LAG ENABLE: pre-set = 2
• M158 ENABLE DANFOSS COMPRESSOR: pre-set = NO
• M180 OTHER COMPRESSOR START IN SEQUENCING MODE: pre-set = 50%
4.8.1. General description
The sequencing function must be enabled when it’s necessary to use a system with more than two units.
The configuration system is similar to bus one, the number of units which can be present is limited by parameter M03
and the number of units that can be on simultaneously is limited by parameter M04.
In the following figure is shown the configuration system.
MASTER SLAVE SLAVESLAVESLAVE
USER
In the system there is only one master board, there may be only one user board and the other units are all slaves; a
slave board may be the user board too. The user board has to be connected to the RS485 serial port called USER of
the board.
To the master board can be connected either a CO3 user or a EO3 user.
– If the users connected to the slave boards are different from the user connected to the master board, the users
connected to the slave boards can’t be used when the remote user mode is enabled.
– If the users connected to the slave boards are equal to the user connected to the master board, the keypad of the
users connected to the slave boards can’t be locked when the remote user mode is enabled.
The units don’t have the same values for their parameters.
The master is always the board with the lowest lead lag address (parameter M01), therefore the board with serial
address 1 is always the master. If the master doesn’t work, automatically another unit will replace it, in this case the
board with serial address 2. When the board with serial address 1 works well, it becomes the master.
UNIT 1
SLAVE
UNIT 2
SLAVE
RS485
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