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Items
Electrical
conductivity (25°C)
-
Cl
Basic
items
2-
SO
4
Acid consumption
(pH4.8)
Total hardness
Fe
2-
S
Other
items
+
NH
4
SiO
2
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.
Therefore, the pipe system should be cleaned periodically. Oxalic acid, acetic acid and formic acid can
be used as the organic cleaning agent, but the strong chloracid is not allowed as it will corrode the copper
tube of the heat exchanger and then lead to water and refrigerant leakage.
■ Preparation of materials and tools
Several bags of environmental friendly scale remover, or similar cleaning liquid.
■ Cleaning Instructions
Step 1: estimate the required amount of scale remover in accordance with the system water volume
and severity of scaling.
Step 2: add the scale remover to the water tank and the scale remover.
Step 3: start through the contactor the water pump every 10 minutes and spread the scale remover in
water more quickly and widely.
Step 4: after that, follow the steps below:
(1) Let the water pump run for another 1-2 hours.
(2) 1-2 hours later, change the cleaning solution to anti-rusting agent. Then, drain the water system and
check the water quality. If water is cloudy, then it indicates the cleaning effect is satisfactory.
(3) Open the water inlet to see if scale on the shell and tube has been removed. If not, clean the shell
and tube separately again by the skilled serviceman and then rinse them. If there is still sand, scale
and other foreign matters at the bottom of the shell and tube, let cleaning solution in from the inlet
pipe and then let the foul water out through the drain outlet.
(4) Fully charge the water system and let it run for another 1-2 hours.
Water quality requirement
pH (25°C)
μs/cm
-
mg(Cl
)/L
2-
mg (SO
)/L
4
mg (CaCO
) /L
3
mg (CaCO
) /L
3
mg (Fe) /L
2-
mg (S
) /L
+
mg (NH
)/L
4
mg (SiO
)/L
2
NOTE: "○" indicates possible corrosion or scaling.
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
Cold/hot water
Circulating
Makeup
water
water
6.8-8.0
6.8-8.0
<400
<300
<50
<50
<50
<70
<1.0
Undetectable
Undetectable
<1.0
<30
32
Trend
Corrosion
○
○
<50
○
<50
○
<50
<70
<0.3
○
○
<0.3
○
<30
Scale
○
○
○
○
○
○
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