Ka
ysun Amaz
on Unit
ario T
op Dischar
ge Engineering Da
ta Book
Amazon Unitario Top Discharge
176
11 Commissioning
11.1 Outdoor Unit Capacity Settings
The capacity of each outdoor unit (on switch ENC2 on each outdoor unit’s main PCB) is factory-set and should not need
changing. Check that the capacity settings are correct. Refer to Table 3-11.1.
Table 3-11.1: Outdoor unit capacity settings
Capacity settings
1
10HP
7
22HP
2
12HP
8
24HP
3
14HP
9
26HP
4
16HP
A
28HP
5
18HP
B
30HP
6
20HP
C
32HP
11.2 Multi-system Projects
For projects with multiple refrigerant systems, each independent refrigeration system (i.e. each system of one outdoor
unit and its connected indoor units) should be given a test run independently, before the multiple systems that make up a
project are run simultaneously.
11.3 Pre-commissioning Checks
Before turning on the power to the indoor and outdoor units, ensure the following:
1. All indoor and outdoor refrigeration piping and communication wiring has been connected to the correct refrigeration
system and the system to which each indoor and outdoor unit belongs is clearly marked on each unit or recorded in
some other suitable place.
2. Pipe flushing, gastightness testing and vacuum drying have been satisfactorily completed as per instructions.
3. All condensate drain piping is complete and a watertightness test has been satisfactorily completed.
4. All power and communication wiring is connected to the correct terminals on units and controllers. (Check that the
different phases of the 3-phase power supplies have been connected to the correct terminals).
5. No wiring has been connected in a short-circuit.
6.
The power supplies to indoor and outdoor units have been checked and the power supply voltages are within ±10%
of the rated voltages for each product.
7.
All control wiring is 0.75mm
2
three-core shielded cable and the shielding has been grounded.
8. The outdoor unit’s capacity switch is set correctly (see Part 3, 11.1 “Outdoor Unit Capacity Settings”) and all other
indoor and outdoor unit field settings have been set as required.
9. The additional refrigerant charge has been added as per Part 3, 8 “Charging Refrigerant”. Note: In some
circumstances it may be necessary to run the system in cooling mode during the refrigerant charging procedure. In
such circumstances, points 1 to 8 above should be checked before running the system for the purpose of charging
refrigerant and the outdoor unit liquid and gas stop valves should be opened.
During commissioning, it is important that you:
Keep a supply of R410A refrigerant at hand.
Keep the system layout, system piping and control wiring diagrams at hand.
