MCAC-2008-11 Air-cooled Modular Chiller
50
Note:
1) Electrify unit 12 hours before starting to pre-heating the compressors, if it is not been done in advance,
the compressor may be damaged.
2) Regulate the water flow switch and the valve on the inlet pipeline carefully to ensure the water flow can
keep the 90% of the rating.
3) Check if the components of unit are loose.
4) Check if there is any problem of power supply or wiring before starting, especially phases sequence, if it
is incorrect, exchange any two of them with each other and ensure all the components are tightly
connected.
5) Connect the water flow switch correctly to the control cycle.
6) Set tightly the Temp. Sensor to the corresponding site of unit.
13. Testing
1. Preparation
After cleaning the water system pipeline for several times, ensure the water is clean, then pump and drain
again, and start the pump to ensure the flow and the pressure of inlet and outlet pipeline is qualified.
Notice: the water pump is under the control of the main unit, so when the water system is running, it can
make the control circuit of water pump AC contactor electrify by temporarily wiring, thus to make the water
pump running.
Warning: it is absolutely forbidden to start the pump by the control of main unit before the water system
has been adjusted well.
1) Please set the address switch on the module unit’s PCB according to the rule below.
Warning: address switch setting must be done without any electric supply and when the unit is electrified,
setting is absolutely forbidden.
Unit address setting Corresponding table between address code and unit address
z 0 presents NO. 0 main unit，1～F in turn presents NO
1～15 auxiliary units.(respectively)
z One module consists of two units, so there are two
addresses for each module.
z Address of each unit should not be repeated;
otherwise modules would be unable to start due to
protection. So it must set the switch to different address
code.
Address
code
Unit address
0 NO. 0 main unit
1 NO. 1auxiliary unit
2 NO. 2 auxiliary unit
3 NO. 3 auxiliary unit
4 NO. 4 auxiliary unit
5 NO. 5 auxiliary unit
6 NO. 6 auxiliary unit
7 NO. 7 auxiliary unit
8 NO. 8 auxiliary unit
9 NO. 9 auxiliary unit
A NO. A auxiliary unit
B NO. B auxiliary unit
C NO. C auxiliary unit
D NO. D auxiliary unit
E NO. E auxiliary unit
F NO. F auxiliary unit
2) Digital scroll modular and Normal scroll modular can be selected according to DIGIT switch.
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