Start-Up; Preliminary Checks; Actual Start-Up; Operation Of Two Units In Master/Slave Mode - Carrier AquaSnap 61AF 022 Installation, Operation And Maintenance Instructions

10 - START-UP

10.1 - Preliminary checks

Never be tempted to start the heat pump without reading fully,
andunderstanding, the operating instructions and without
havingcarried out the following pre-start checks:
- Check the water circulation pumps, air handling units and al
other equipment connected to the condenser.
- Refer to the manufacturer's instructions.
- 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.

10.2 - 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
condenser.
- All setpoint adjustments and control tests must be
carried out before the unit is started up.
- Please refer to the 61AF SmartVuTM control manual.
The unit should be started up in Local ON mode. Ensure that all
safety devices are satisfied, especially the high pressure switches.
10.3 - 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
configuration). 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, setpoint, load
shedding, etc.) are controlled by the unit configured as master
and must only be applied to the master unit.
Depending on the installation and control type, each unit can
control its own water pump. Please install check valves in the
leaving water piping of each unit, as shown in the following
diagrams. 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).
Standard configuration: return water control
Configuration: leaving water control
Legend
B
Master unit
C
Slave unit
Additional CCN board (one per unit, with connection via communication bus)
Water inlet.
Water outlet
Water pumps for each unit (included for units with hydraulic module)
T Additional sensors for leaving water control, to be connected to channel 1
T
of the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors
Check valve