Commissioning And Maintenance; Check Before Startup; Requirements On Water System And Water Quality - Gree D Series Owner's Manual

7 Commissioning and Maintenance

The unit shall be maintained periodically by the skilled servicemen from Gree or a designed
person under our professional guide to guarantee the unit operates reliably in a long term.

7.1 Check before Startup

Please finish the following steps before staring the system.
Before energization, be sure the insulation resistance between the wiring terminal and ground
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complies with the local codes and regulations and check if the motor meets the insulation
requirement with a resistance meter.
Check if all connenctions are in good condition and clean.
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Close the main power switch.
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Check if the voltage between terminals keeps balance within deviation of 2%.
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Check if the power consumption of the unit complies with the rated value on the nameplate.
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Be sure the power cord is capable of carrying the rated current on the nameplate.
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Be sure all valves of water and refrigerant pipeline are placed properly.
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Reset all hand reset control elements.
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Be sure all sensor are placed installed properly.
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7.2 Requirements on Water System and Water Quality

Be sure to open the water pump after the water system has been flushed times and the water
quality has met the requirements and meanwhile be sure the water flow rate and pressure are
within the allowable range.
The industrial water generates little scale when used as the refrigeration medium while the
well or river water will generate much more scale and sands which would reduce the flow rate of
the evaporate and cause freezing. Therefore, the well or river water must be firstly treated with the
water softening equipment and analyze the PH, heat conductivity, Cl ion, and S ion before use.
Items
PH
Heat Conductivity
Cl ion
SO ion
4
Fe
Basic ion
Hardness
S ion
Amonia ion
Si
Na ion
NOTE: "○" indicate possible corrosion or scale.
Even if the water qualify is under the strict control, calcium dioxide or other minerals will still
form on the surface of the heat exchanger which will affect the heat exchange efficiency and be
eliminated by formic acid, lemon acid, acetic acid or other organic acid.
Copyright 2018. This translation is property of GREE PRODUCTS SL. All rights reserved. Total or partial reproduction without its express authorization is prohibited.
D Series Modular Air-cooled Scroll Chillers Owner's Manual
Water Quality Requirement
Chilled water
Circulating water
(<20℃ )
6.5~8.0
<200uV/cm(25℃ )
<50ppm
<50ppm
<1ppm
<50ppm
<50ppm
/
/
<30ppm
/
Supply water
6.5~8.0
<200uV/cm(25℃ )
<50ppm
<50ppm
<0.3ppm
<50ppm
<50ppm
/
/
<30ppm
/
30
Potential effect
Corrosion Scale
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