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6.3.3.5 Check to the Electric System
WARNING
(1)Do not check the power supply without any proper detection device and preventive
measures, or it would lead to severe injuries or even death.
(2)Each single unit should be supplied with dedicated power lines. After wiring, check the
following items one by one.
1) Is the size of the air switch proper?
2) Does all electric installation meet corresponding electric standards or codes?
3) Is all wiring correct?
4) Are all interlocks work well?
5) Do all contacts work well?
6) Are the power supply and insulation in good condition?
7) Is the set point of the control and protection elements correct?
6.4 Initial Run
Following inspections above, the unit is allowed for initial run.
6.4.1 Check for Initial Run
Check for initial run should be performed by four steps as shown below.
6.4.1.1 Check for Communication
Check if the displayed number of modules is the same as the real number. If so, it indicates
communication goes normal. If not, take the following inspections.
(1)Are all connected units powered on?
(2)Does each single unit have a unique address?
(3)Is there any single unit which has not been detected by the control? Is the communication
line of the mainboard connected correctly or is the communication line itself non-
defective?
6.4.1.2 Check for a Single Unit
(1)Commission one single unit first and stop all others.
(2)Do its compressor, fans and the 4-way valve run normally without any unusual noise?
(3)Is the voltage phase difference lower than ±2%?
(4)Voltage phase difference =(Phase difference between the max and average voltage)/
(Average voltage)×100%.
(5)Start up this single unit.
(6)Do its compressor, fans and the 4-way valve run normally without any unusual noise?
(7)Check other units one by one in the same way.
6.4.1.3 Check for the Water Flow of a Single Unit
In order to prevent the water temperature changing too quickly, it is suggested to open all
terminal units in commissioning, and observe and record the pressure drop of the manometers
A Series Modular-type Air-cooled (Heat Pump) Chiller
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