Midea LSBLG320/MZ - Applicable Standard of Water Quality for the Unit; Performance Adjustment Factors; Ethylene and Propylene Glycol Factors

MCAC-CTSM-2014-03 DX type water-cooled screw chiller (PCB Control)
77
analyzed before being used, such as PH value, conductivity, concentration of chloride ion,
concentration of sulfide ion, and so on.
※ Applicable standard of water quality for the unit
PH
value
Total
hardnes
s
Conductivit
y
Sulfid
e ion
Chlorid
e ion
Ammoni
a ion
Sulfate
ion
Silicon
Iron
content
Sodium ion
Calciu
m ion
7～
8.5
<50ppm
<20μV/cm(
25℃)
No
<50pp
m
No
<50pp
m
<30pp
m
<0.3pp
m
No
requirement
<50pp
m
2). Performance adjustment factors
The antifreeze must be required according to anyone condition as following:
1. The outlet water temperature is below 5℃;
2. The ambient temperature is below 0 ℃;
3. Don’t start up the unit for a long time.
4. The power supply was cut off and needn’t change the water in system.
Ethylene and Propylene Glycol Factors
A glycol solution is required when the unit with condition as mentioned. The use of glycol will reduce
the performance of the unit depending on concentration.
Ethylene Glycol
Ethylene
glycol
Evaporator side
Quality of
glycol（%）
Cooling
capacity
modification
Power
modification
Water flow
modification
Water
resistance
Freezing
point ℃
30
0.972
0.99
1.013
1.215
-16
35
0.971
0.984
1.04
1.267
40
0.965
0.977
1.074
1.325
-23
45
0.96
0.967
1.121
1.389
50
0.946
0.955
1.178
1.458
-35
Condenser side
30
0.991
1.02
1.013
1.164
-16
35
0.989
1.027
1.04
1.212
40
0.986
1.032
1.074
1.261
-23
45
0.984
1.037
1.121
1.309
50
0.98
1.044
1.178
1.362
-35
Note: the freezing point not shown here, please calculate according to interpolation method.