35
● Thoroughly flush all water pipelines before
installation, ensure no foreign matter before use.
Note that do not flush any foreign material into
plate heat exchanger.
● Apply good sealant to seal joint and the joint
must bear pressure and temperature of system.
●
If water pipes of different material are used,
ensure they are isolated, preventing electrical
conduction and corrosion.
(6) Water treatment and water quality control
● Confirm with water treatment company that
antifreezing solution, scale inhibitor, corrosion
remover that are used in water treatment do not
corrode stainless steel and copper products
before use. When system links with water tank,
to avoid domestic hot water contaminated by coil
leakage, antifreezing solution, scale inhibitor,
corrosion remover are not allowed to use.
● Water quality control methods and reference
refer to water quality requirements issued by
Japan Refrigeration and Air Conditioning
Industry Association (JRA-GL-02-1994). Medium
and low water temperature reference values of
water module unit are seen in table 8.1.
Table 8.1 Benchmark of Medium and Low Water T
emperature and Make-up Water Quality (Reference Value)
Medium and Low Water
Temperature System
Tendency
Item
Circulation water
20ºC＜T＜60 ºC
Make-up water Corrosin Scale
PH (25 ºC) 7.0 to 8.0 7.0 to 8.0 √ √
Electroconductibility(mS/m) (25 ºC)
＜30 ＜30 √ √
Chloridion(mgCI
-
/L) ＜50 ＜50 √
Sulfion (mgSO
4
2-
/L) ＜50 ＜50 √
Acid consumption(PH4.8)(mgCaCO
3
/L) ＜50 ＜50 √
Total hardness (mgCaCO
3
/L) ＜70 ＜70 √
Calcium hardness (mgCaCO
3
/L) ＜50 ＜50 √
Standard
Items
Ionic state silicon(mgCaSiO
2
/L) ＜30 ＜30 √
Iron (mgFe/L)
＜1.0 ＜0.3 √ √
Copper (mgCu/L) ＜1.0 ＜0.1 √
Sulfion (mgS
2-
/L) Undetermined Undetermined √
Ammonia ion mgNH
4
+
/L) ＜0.3 ＜1.0 √
Chlorine residue (mgCI/L) ＜0.25 ＜0.3 √
Free carbon dioxide (mgCO
2
/L) ＜0.4 ＜4.0 √
Reference
Items
Stability index - - √ √
(5) Basic requirements for operating water pipe:
●
Let the end of pipe face downward when
deburring, avoiding foreign matter invading into
pipe.
● Flexible joint should be used between water
module interface and on-site pipeline, avoiding
vibration propagation and pipeline breakage.
●
Arrange drainage interface at low positions in
water system, make water in water module and
pipeline smoothly drained out. Arrange air
exhaust device at high positions. Do not treat air
vent valve and drainage interface thermally for
repair convenience.
(4) Notes for connecting water pipe
● A small amount of water may exist in water
module. Note that when sealing cap is opened.
●
Pay attention to connection location of pipe. Do
not connect water inlet and water outlet pipe
inversely.
●
Use water pipe conforming to specification.
Dimension of water pipe is equal to or above
interface dimension in machine (G1/1/4”). For main
connecting pipeline, recommend using DN40
water pipe to reduce pressure loss in pipeline.
●
Properly keep water pipe thermal insulated and
avoid pipeline freezing.
● Regularly clean water filter.
●
Pipe and pipe joint in water module should be
easy to remove and convenient to operate and
clean.
● Galvanized parts that may cause corrosion in
water system are prohibited.
●
Water pipe and pipe joint must be supported
independently on water module.
NOTE:
Be sure to install the water strainer horizontally
on the water inlet side. In case the water ow
downwards, vertical installation is allowed.
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