Installation- Mechanical
21PKGP-SVX19A-EN
CAUTION
●
The user needs to regularly test the water quality before the installation and during the operation to ensure that
the water quality meets the requirements of the above table. Once the water quality exceeds the allowable range
for a long time, there’s possibility corrosion leakage and serious scaling for the heat exchanger.
●
Any item with corrosion tendency show that long-term water quality exceeding the allowable range can lead to
corrosion leakage of the heat exchanger, even lower the performance or aect normal operation.
●
Any item with a tendency to scale down indicates that the water quality exceeds the allowable range for a
long time, which will lead to serious scaling of the heat exchanger, aect the heat exchange performance, and
directly lead to the decrease of the cooling (heating) capability of the unit.
●
The loss caused by the user’s water quality problem shall be borne by the user.
Ethylene glycol antifreeze to the circulating water
For chiller units, when the local minimum environment temperature is lower than 0°C, ethylene glycol antifreeze must be added
to the circulating water for the low ambient temperature unit, and the freezing point of the antifreeze must be 2-5 °C lower than
the local minimum environment temperature. The concentration of the antifreeze ethylene glycol must be checked regularly to
prevent the unit from being damaged.
The concentration of ethylene glycol should be higher than 20% to prevents hydrolytic corrosion at low concentrations.
When replenishing circulating water, the make-up water should be containing the same concentration of ethylene glycol. And it
is required to weekly test the concentration.
The relation between the concentration of ethylene glycol and the freezing point shows in the following table & chart.
Properties of ethylene glycol liquid
Density
(20°C)
Ethylene glycol
precentage (V%)
Freezing Point
(°C)
Density
(20°C)
Ethylene glycol
precentage(V%)
Freezing Point
(°C)
1.034 26.4 -10 1.084 64 -62
1.038 27.2 -12 1.085 64.8 -64
1.041 29.6 -14 1.086 65.6 -66
1.044 32 -16 1.087 66.3 -68
1.048 34.2 -18 1.039 68.5 -66
1.051 36.4 -20 1.09 69.6 -64
1.053 38.4 -22 1.091 70.8 -62
1.056 40.4 -24 1.092 72.1 -60
1.059 42.2 -26 1.094 73.3 -58
1.061 44 -28 1.095 74.5 -56
1.063 45.6 -30 1.096 75.8 -54
1.064 47 -32 1.097 77 -52
1.066 48.2 -34 1.098 78.4 -50
1.068 49.6 -36 1.1 79.6 -48
1.07 51 -38 1.101 81.2 -46
1.071 52.1 -40 1.102 82.5 -44
1.073 53.6 -42 1.103 83.9 -42
1.074 54.6 -44 1.104 85.4 -40
1.075 55.6 -46 1.105 86.9 -38
1.077 56.8 -48 1.107 88.4 -36
1.078 58 -50 1.108 90 -34
1.079 59.1 -52 1.109 91.5 -32
1.08 60.2 -54 1.11 93 -30
1.081 61.2 -56 1.111 95.5 -26
1.082 62.2 -58 1.112 97.8 -20
1.084 64 -62 1.113 100 -13.1
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