Toshiba RUAGP Series Original Owner's Manual page 71

Note on use of high EER type
Water piping work is to be carried out in accordance with the laws and regulations of the installed location.
1. In terms of water quality standards, be sure to satisfy the condition of once-through water in cooling water
system as stipulated by "Water Quality Guidelines for Cooling and Air Conditioning Devices"
(JRA-GL-02-1994) of The Japan Refrigeration and Air Conditioning Industry Association.
Water quality standard values of cooling water, chilled water, warm water, and supplementary water
(1) Item names, term definitions, and units are based on JIS K 0101.
Units and values in brackets ({ }) are conventional units provided for reference.
(2) A circle (○) in a cell indicates a factor related to corrosion or scale generation tendency.
(3) Supply and supplementary source water means tap water (water supply), industrial water, or groundwater. Purified water,
grey water, and softened water are excluded.
(4) The above 15 items are representative factors of corrosion and scale impairment.
* For details, refer to the "Water Quality Guidelines for Cooling and Air Conditioning Devices" (JRA-GL-02-1994) of The
Japan Refrigeration and Air Conditioning Industry Association.
2. To prevent the spray nozzle from becoming clogged with foreign matter, install a 50-mesh strainer in the
main pipes as shown below.
Sprinkler inlet
3. Depending on the water quality, scales may adhere to the surface of the air heat exchanger. Stains such as
scales not only degrade the performance of the air heat exchanger but may damage the air heat exchanger
due to corrosion, so periodically check the scale adhesion condition on the surface of the air heat exchanger.
If scales are found on the surface of the air heat exchanger, use a brush and low-pressure water to remove
them. If necessary, install a water softener (procured locally) on the sprinkler inlet.
(1) (3)
Item
pH (25ºC）
Electrical conductivity (mS/m)(25°C)
(1)
{μS/cm} (25°C）
-
Chloride ion (mgCl /l)
2-
Sulphate ion (mgSO /l)
4
Acid consumption (pH4.8) (mgCaCO
Total hardness (mgCaCO /l)
3
Calcium hardness (mgCaCO
Ionic silica (mgSiO /l)
2
Iron (mgFe/l)
Copper (mgCu/l)
2-
Chloride ion (mgS /l)
+
Ammonium ion (mgNH /l)
4
Residual chlorine (mgCl/l)
Free carbon (mgCO /l)
2
Stability index
Pipe layout example
Main pipes
Strainer (required)
Cooling water system
Once-through
Once-through water
6.8 to 8.0
40 or less
{400 or less}
50 or less
50 or less
/l) 50 or less
3
70 or less
/l) 50 or less
3
30 or less
1.0 or less
1.0 or less
Undetectable
1.0 or less
0.3 or less
4.0 or less
-
- 69 -
(2)
Tendency
Corrosion Scale formation
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○
○
○
○
○
○ ○
○
○
○
○
○
○ ○
Air breather valves (required)
Gate valves (required)
Water drain valves (required)