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7.7 - Operation of two units in master/slave mode
(option 58)
As standard, the control of a master/slave assembly is from
the entering water temperature and does not require any
additional sensors (standard conguration). It can also be
controlled from the leaving water temperature, in this case
two additional sensors must be added on the common
piping.
All parameters, required for the master/slave function must
be congured using the Conguration menu MST_SLV.
All remote controls of the master/slave assembly (start/
stop, set point, load shedding, etc.) are controlled by the
unit congured as master and must only be applied to the
master unit.
Each unit controls its own water pump. If there is only one
common pump, and in cases with variable ow, isolation
valves must be installed on each unit. They will be
activated at the opening and closing controlled by the
individual units using the water pump control signals.
Refer to the 30XAV-ZE Touch Pilot control manual for a
more detailed explanation.
WARNING: Both units must have option 58 to allow the
Master/Slave operation.
Legend:
1 Master unit
2 Slave unit
Control boxes of the master and slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard for units with hydronic
module)
Additional sensors for leaving water control, to be connected to channel 1 of
the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors
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