Carrier 30KAV-ZE Series - Operation of Two Units as a Master;Slave Pair (Option 58); Service Valves (Option 92)

12.5 - Operation of two units as a master/slave
pair (option 58)
The master-slave pair is controlled on the water inlet without any
additional sensors being added (standard conguration). It is also
possible to control on the water outlet by adding two additional
sensors in the common supply pipe work.
All the parameters required for the master/slave function must be
congured using the MST_SLV conguration menu. All remote
controls of the Master/Slave pair (start/stop, setpoint, load
shedding, etc.) are managed by the unit congured as the master
and must only be applied to the master unit.
Each unit controls its own water pump. If there is only one common
pump, in cases with a variable ow, isolation valves must be
installed on each unit. These should be controlled (opened and
closed) using the controls for the relevant unit (in this case, valves
will be controlled using the dedicated water pump outputs). Refer
to the SmartVu™ control manual for a more detailed explanation.
WARNING:TopermitMaster/Slaveoperationbothunitsmust
be equipped with option 58.
Conguration: Control on the water outlet
B
C
Key
B
Master unit
C
Slave unit
Control panels for Master and Slave units
Water inlet
Water outlet
Water pumps for each unit (included as standard in units with hydraulic
module)
Additional sensors for the control of the leaving water temperature to be
connected on channel 1 of the slave boards of both Master and Slave unit
Communication bus CCN
Connection of two additional sensors
12.6 - Service valves (option 92)
The unit can be equipped with optional service valves to facilitate
maintenance and repair operations.
If option 92 is ordered, each refrigerating circuit will be equipped
with isolation valves on the economiser line, and at the compressor
discharge and suction.
WARNING: The valve at the compressor suction should only
beoperatedwhenthereisnodierentialpressureacrossit.
Operatingthevalvewhenthereisapressuredierentialmay
compromise the valve's sealing or even result in failure.
Equal pressure
12 - OPTIONS
88