24
Total
hardn-
ess
Fe
mg(Fe)/L
<1.0 <0.3 0 0
S
2-
mg(S
2-
)/L
Undetecta-
ble
Undet-
ectable 0
NH
4
+
mg(NH
4
+
)/L
<1.0 <0.3 0
SiO
2
mg(SiO
2
)/L
<30 <30
0
NOTE:“○”indicates possible corrosion or scaling.
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.
(5)stop the unit to drain up waste solution. If impossible, drain it with making up water at
the same time until all waster solution has been drained out completely (at this time
water is transparent and PH is 7).
(6)repeat 4 and 5.
(7)clean or change the filters in the water system.
(8)see if the difference between the entering and leaving water temperature is improved.
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
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