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Setting rS3, Changeover Timeout, indicates the duration of each cycle. This can be a value from 1 to
9999 minutes.
If a Slave needs to execute heating mode, Redundancy operation is ignored.
If the Master needs to execute heating mode, the Slaves will keep operating based on the Redundancy
Algorithm.
The redundancy time increases only if there is at least one active (non-redundant) unit cooling from the
active units group.
The changeover between units happens only if no active unit is cooling.
Modbus Communication
Detailed instructions on Modbus communication can be found in the link below.
https://seifertsystems.com/site/assets/files/6903/rdtg2001-0_2_-_generic_modbus_table.pdf
Further notes:
From Modbus side, any setting can be with 0.1°C precision. From the display, the precision is 0.5°C.
When having a setting, example 30.4°C, this will be rounded to 30.5°C when accessed via display.
When Ambient, Icing and Pressure are not enabled, the value displayed (Modbus) is -50°C.
When saving settings via communication, S is shown on display for 1 second.
When system goes in Cooling Mode, C is shown on display for 1 second.
When system goes in Heating Mode, H is shown on display for 1 second.
When accessing the Display Settings of Menu 2/3, any settings from Modbus are ignored.
When running a test with the door contact open, the display only shows TEST, since the unit will not be
OFF.
When running a test with Alarms, the Alarms and TEST are shown together.
When unit is not Modbus Address 1, the Master/Slave and Redundancy parameters are hidden from
Menu3 when using Client Password. (MS1, MS2, MdL, rS1, rS2, rS3).
The Blue LED is ON when the unit is cooling.
A red LED is ON when the unit is heating.
The red LED flashes when an alarm is present.
Revisions Nr. 1-11 - 08.01.2024
Doc. nr. 99870800201USL
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