34
13 - START-UP
13.1 - Preliminary checks
•
Never be tempted to start the chiller without reading
fully, and understanding, the operating instructions and
without having carried out the following pre-start checks:
•
Check the chilled water circulation pump operation
with the Quick Test function.
•
Check the air handling units and all other equipment
connected to the evaporator. Refer to the manufacturer’s
instructions.
•
Check the condensing loop water circulation pump
operation with the Quick Test function.
•
For units without hydronic module, the water pump
overheat protection devices must be connected in
series with the pump contactor power supply.
•
Ensure that there are no refrigerant leaks.
•
Confirm that all pipe securing bands are tight.
•
Confirm the the electrical connections are secure.
13.2 - Actual start-up
IMPORTANT
•
Commissioning and start-up of the chiller must be
supervised by a qualified refrigeration engineer.
•
Start-up and operating tests must be carried out with
a thermal load applied and water circulating in the
evaporator.
•
All set-point adjustments and control tests must be
carried out before the unit is started up.
The unit should be started up in Local ON mode.
For 30RWA units operating with a remote air-cooled
condenser the compressor oil level must be monitored
during the system start-up phase. This is to ensure that the
oil charge of the original compressors is sufficient for the
system size and the piping configuration. Once the oil level
has stabilised, it must not be lower than 1/4 of the oil sight
glass level. An additional oil quantity may be necessary
for piping lengths (supply/return) exceeding 200 mm.
Ensure that all safety devices are operational, especially
that the high pressure switches are switched on and that
the alarms are acknowledged.
13.3 - Operation of two units in master/slave mode
The control of a master/slave assembly is in the entering
water piping (system return) and does not require any
additional sensors (standard configuration). For 30RW
160-300 units, it can also be located in the leaving water. In
this case two additional sensors must be added on the com-
mon piping. All parameters, required for the master/slave
function must be configured using the Service Configura-
tion menu.
All remote controls of the master/slave assembly (start/stop,
set point, load shedding etc.) are controlled by the unit
configured as master and must only be applied to the
master unit.
IMPORTANT: The two units must be equipped with
option No. 155 - CCN time scheduling and communica-
tions “Clock Board”.
Depending on the installation and control type, each unit can
control its own water pump. If there is only one common
pump for the two units, the master unit can control this. In
this case shut-off valves must be installed on each unit. They
will be activated at the opening and closing by the control
of each unit (and the valves will be controlled using the
dedicated water pump outputs).
30RW/RWA 020 to 300 (standard configuration:
return water control)
30RW/RWA 160 to 300 (with configuration: leaving
water control)
legend
1
Master unit
2
Slave unit
Additional CCN board (one per unit, with connection via communication bus)
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
1
2
1
2
