Orion RKS400F-S, Operation Manual, Page: 28 / 60

26
Water Quality Management
CAUTION
1. Chilled water should be either clean water (tap water) or a 30 to 40% solution of industrial use ethylene glycol in water.
Use of non-approved water can result in damage to the product, leaking, and possible electric shock or electrical shorts.
Refer to the following chart for information regarding the standard quality guidelines for clean (tap) water.
■
Water Quality Control of Clean Water
Item Working water
Standard
components
pH (25
℃ ）
6.8
〜
8.0
Electrical conductivity (25
℃ ）（
μ S/cm
）
1
〜
400
Chloride ion (mgCl¯/L) Max. 50
Sulphate (mgSO
₄
²¯/L) Max. 50
Acid consumption (pH4.8)(mgCaCO
₃
/L) Max. 50
Total hardness (mgCaCO
₃
/L) Max. 70
Calcium hardness (mgCaCO ₃ /L) Max. 50
Silica ion (mgSiO
₂
/L) Max. 30
Reference
components
Iron (mgFe/L) Max. 1.0
Copper (mgCu/L) Max. 1.0
Sulfide ion (mgS²¯/L) Not detected
Ammonium ion (mgNH
₄ ⁺
/L) Max. 1.0
Residual chlorine (mgCl/L) Max 0.3
Free carbon dioxide (mgCO
₂
/L) Max. 4.0
Excerpt from JRA-GL-02-1994 guidelines from The Japan Refrigeration and Air Conditioning Industry Association.
In case of using additive agents, please manage the concentration according to directions of the additive agent
manufacturer. Our company has confirmed that following antifreezes and additive agents are available.
Usage Name
Concentration
Amount
Remark
Antifreeze
Corrosion proof
Aurora brine
30
〜
40
％
Cooling capacity declines 10%.
Vulnerable to corrosion below 30% Nybrine
Corrosion proof Contlim K-6000 2000mg/L Cold and lukewarm water / Hot water
Corrosion proof
Antibacterial protection
Contlim mini #30 1 bottle/liquid 250L Valid period: 3 months
2. If a problem is found after a regular inspection of the water circuit, clean the water tank and water circuit and replace the
water in the tank as necessary. Even if no abnormalities are noticed, evaporation will occur and concentration of
impurities will increase. Therefore the water in the water tank should be replaced once every 3 months. For further
information on regular inspections, see the section on, "Regular Inspections and Maintenance".
3. Refer to the following chart in order to avert future trouble.
Condition of working
water
Description of trouble Procedures to take
The working water has chloride
ion or other corrosive
components
The presence of chloride ion or other corrosive
components can lead to the corrosion of stainless steel in
areas where water passes, and can also lead to water and
gas leaks.
Even if the concentration of corrosive components is
within water quality standards, rust and other floating
matter can form and stick to surfaces or scaling can form
and separate resulting in progressive oxygen
concentration cell corrosion.
ORION's water quality standards are designed to
help control corrosive substances such as chloride
ion, and avoid problems like the progression of
scaling as well as other problems related to water
quality. Water quality management should be
carried out to ensure that working water is within
the prescribed water quality standards.
Install a strainer (20
〜
40 mesh) that can trap and
prevent iron rust and other foreign matter from
entering the product.
When using a concrete water
tank Elution from concrete tanks can lead to a rise in pH in
addition to easy separation of scaling (calcium carbonate,
etc.) resulting in clogging of the evaporator. Also water
leakage can occur due to corrosion from flaked scaling.
Beware of a rise in pH, and if the water quality
standard level is exceeded, change the water. If
using a new concrete water tank, repeatedly
change the water in the tank before using in order
to reduce the quantity of components leeching
from the new concrete.
When using additives in the
working water such as
antifreeze or other viscous
additives Pump capacity (head) will be reduced. Use a low concentration of industrial-use ethylene
glycol water solution of 30 to 40%. Antifreeze does
not evaporate so periodically replace lost water in
order to prevent increasing concentrations.