MCAC-2008-11 Air-cooled Modular Chiller
51
Notice:
a. The DIGIT switch has been set well in the factory and needn’t change.
b. Please turn on the main power 12 hours before staring to preheat the compressor. If the compressor is not
preheated enough, it maybe damaged.
3) Adjust carefully the water flow switch on water system or close valve at inlet to ensure the water flow
volume is 90% of the rating.
4) Check if any component of the unit is loose and the unit has no distortion and rupture.
5) Before starting, please check carefully if the power voltage and wiring are right. Check if the power
sequence is correct. If not, it needs to exchange. Check if the connecting part is tight and fasten once again.
6) Connect the water flow switch correctly to the control cycle.
7) Put the Temp. Sensor to the right position, and then fasten it well to prevent from falling off.
2. Testing
1) Turn on the unit by wire controller. If there is ERROR Code displayed, please first eliminate the
malfunction; confirm there is no malfunction before restarting.
2) After 30 minutes, when the temp of water is stable, adjust the water flow volume to nominal value to
ensure the unit running normally.
3) When the unit is working, check the Running Current, Running Pressure, Water Pressure, Water flow
Volume, Water Temp. Difference between inlet and outlet water, What’s more, adjust the water flow volume
according to the actual conditions to ensure the unit running normally. The follow real values are reference:
Ambient temp.=27 , Cooling condition℃
4) Optimizing the setting parameters according to the local weather and concerning operation references.
5) After the unit stops, start the unit 10 minutes later to prevent the unit from starting frequently. Check if the
control and protection devices are normal according to the following table:
Models 30kW module and 65kW module
High-pressure switch
Cut off
Close
MPa
Reset automatically, unadjusted
4.4
3.2
For compressor
Low-pressure switch
Cut off
Close
MPa
Reset automatically, unadjusted
0.15
0.3
“00” presents to select digital compressor (as the main unit.)
“11” presents to select constant compressor (as the auxiliary unit.)
System
Item
A system
(Digital)
A system
(Constant)
A system
(Constant)
A system
(Constant)
Compressor running current 6A 8A 8A 8A
Condenser temp. 39℃ 38℃ 38℃ 37℃
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