D Series Modular Air-cooled Scroll Chillers
35
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.
(1)
Before energization, be sure the insulation resistance between the wiring terminal and ground complies
with the local codes and regulations and check if the motor meets the insulation requirement with a
resistance meter.
(2) Check if all connenctions are in good condition and clean.
(3)
Close the main power switch.
(4)
Check if the voltage between terminals keeps balance within deviation of 2%.
(5)
Check if the power consumption of the unit complies with the rated value on the nameplate.
(6)
Be sure the power cord is capable of carrying the rated current on the nameplate.
(7)
Be sure all valves of water and refrigerant pipeline are placed properly.
(8) Reset all hand reset control elements.
(9)
Be sure all sensor are placed installed properly.
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.
Water Quality Requirement
Items
Chilled water
Potential effect
Circulating water
(<20
℃
)
Supply water
Corrosion
Scale
PH
6.5~8.0
6.5~8.0
○
○
Heat Conductivity
<200uV/cm(25
℃
)
<200uV/cm(25
℃
)
Cl ion
<50ppm
<50ppm
○
SO
4
ion
<50ppm
<50ppm
○
Fe
<1ppm
<0.3ppm
○
○
Basic ion
<50ppm
<50ppm
Hardness
<50ppm
<50ppm
○
S ion
/
/
Amonia ion
/
/
Si
<30ppm
<30ppm
○
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.
