EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075
- R410A - Air-cooled scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWYQ-
- R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
62
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Master - Slave 1 - Slave 2. Any other addressing will generate a
configuration alarm
M/S Num Of Unit
2
2,3,4
Indicate the number of chiller belonging to Master Slave network. This
parameter have to be set only in the chiller Master, in all Slave units it can
be let at default value as ignored.
M/S Sns Type
NTC10K
NTC10K, PT1000
Define the sensor type used to measure the common leaving water
temperature.
This parameter have to be set only in the chiller Master, in all Slave units it
can be let at default value as ignored.
5.10.3.2 System enable
The startup and shutdown of all system can be performed applying the normal enabling commands
(Local/Remote switch, HMI command, enable by Modbus/BACNet/Lon) to the master unit.
All other slaves unit maintain however their local enabling. When a slave is locally not enable, the
master will consider it as not ready unit and will not send it starting commands.
Since that the master loses his its local enabling (used as system enable), it is present in the menu
4.2.5.2 the parameter
Master Enable
that allows to disable the Master. Disable the Master unit
means that it will not use for the thermoregulation but it will continue to acquire the common
leaving water temperature and it will continue to send the activation command to the slave units.
5.10.3.3 System setpoint
Temperature control in the MS is performed on the base of the common evaporator leaving water
temperature respect the target value set in the Master chiller. This setpoint is global for all system
and it is sent by the Master to all Slaves through the serial communication.
Like in the single chiller, every function to modify the target value (LWT Reset, Double setpoint,
changes by Modbus/BACNet/Lon) can be applied to the Master to modify the global temperature
target.
On the Slave chillers the parameter
Active Setpt
(refer to section 4.1) always will display
the target received by the master except when the unit is in alarm communication or the
function
is active.
5.10.3.4 System Operating Mode: Cool/Heat/Ice
All units belonging to the Master Slave network always have to work with same operating mode.
Since that in all units the operating mode is local, master chiller does not send its operating mode,
it is very important verify that the changeover Cool, Heat, Ice always will be performed in all unit.
For the water cooled chiller remember that the Master Slave cannot manage the Pursuit
mode.
5.10.3.5 Operation with a communication alarm
All Slave units communicate through a serial communication with the Master unit. If during the
normal functioning occurs a communication failure between Master and Slave the system continue
to run with the followings behavior:
