Start-Up; Preliminary Checks; Actual Start-Up; Operation Of Two Units In Master/Slave Mode - Carrier AQUASNAP 30RA B Series Manual

11 - START-UP

11.1 - 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 pumps, air handling
units and all other equipment connected to the evaporator.
- Refer to the manufacturer's instructions.
- For units without hydronic module, the water pump
overheat protection device must be connected in series
with the pump contactor power supply. If the pump is not
supplied with the unit (unit without hydronic module),
verify that the power input of the field-installed pump
does not exceed the rating of the standard pump contactor,
supplied in the control box (max. 3 kW for sizes 040 to
160 and max. 5.5 kW for sizes 200 and 240).
- Refer to the wiring diagram supplied with the unit.
- Ensure that there are no refrigerant leaks.
- Confirm that all pipe securing bands are tight.
- Confirm the the electrical connections are secure.

11.2 - 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.
• Please refer to the controls section of this manual.
The unit should be started up in Local ON mode.
Ensure that all safety devices are satisfied, especially the high
pressure switches.

11.3 - Operation of two units in master/slave mode

The control of a master/slave assembly is in the entering water
and does not require any additional sensors (standard confi-
guration). It can also be located in the leaving water. In this case
two additional sensors must be added on the common piping.
All parameters, required for the master/slave function must be
configured using the Service Configuration 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.
26
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).
30RA 040 to 240 (standard configuration: return water
1
30RA 090 to 240 (with configuration: leaving water
1
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
control)
2
control)
2