Daikin VRV-WIII RWEYQ24PY1 Operation Manual - Page 17
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• Check if the heat source of the room is excessive
during cooling operation.
• Check if the inlet temperature of the heat source
water is within its range.
Do not exceed its range.
• Check if the water quantity of the heat source
water is within its range.
Do not exceed its range.
11. WATER QUALITY
In order to prevent water piping from corrosion and
scale, use heat source water that meets the water
quality standards below.
Water quality standards for chilled water, hot
water and make-up water (4) (6)
Cooling water
system (3)
Circulation system
Item (5)
Circula-
Make-
tion
up
water
water
Standard items
6.5 to
6.0 to
pH (25°C)
8.2
8.0
Electrical Conductivity
Less
Less
(mS/m)(25°C)
than 80
than 30
Chloride ions
Less
Less
–
than 200
than 50
(mgcl
/L)
Sulfate ions
Less
Less
2-
than 200
than 50
(mgSO
/L)
4
Acid consumption
Less
Less
(pH4.8)
than 100
than 50
(mgCaCO
/L)
3
Total hardness
Less
Less
(mgCaCO
/L)
than 200
than 70
3
Calcium hardness
Less
Less
(mgCaCO
/L)
than 150
than 50
3
Ionic-state silica
Less
Less
(mgSiO
/L)
than 50
than 30
2
Reference items
Less
Less
Iron (mgFe/L)
than 1.0
than 0.3
Less
Less
Copper (mgCu/L)
than 0.3
than 0.1
Shall not
Shall not
Sulfate ion
be
be
2-
(mgS
/L)
detected
detected
Ammonium ion
Less
Less
+
than 1.0
than 0.1
(mgNH
/L)
4
Residual chlorine
Less
Less
(mgCl/L)
than 0.3
than 0.3
Free carbon dioxide
Less
Less
(mgCO
/L)
than 4.0
than 4.0
2
6.0 to
Stability index
–
7.0
English
Hot water system (2)
Tendency (1)
Circula-
tion
Make-
Corro-
water
up
Scale
sion
(20°C ~
water
60°C)
7.0 to
7.0 to
8.0
8.0
Less
Less
than 30
than 30
Less
Less
than 50
than 50
Less
Less
than 50
than 50
Less
Less
than 50
than 50
Less
Less
than 70
than 70
Less
Less
than 50
than 50
Less
Less
than 30
than 30
Less
Less
than 1.0
than 0.3
Less
Less
than 1.0
than 0.1
Shall not
Shall not
be
be
detected
detected
Less
Less
than 0.3
than 0.1
Less
Less
than
than 0.3
0.25
Less
Less
than 0.4
than 4.0
–
–
[NOTES]
(1) The circle marks in the columns for corrosion or
scale to develop.
(2) Corrosion has a tendency to occur when water
temperature is high (40°C or higher), and if met-
als with no protective coating whatever are
directly exposed to water, it would be a good
idea to take effective measures against corro-
sion such as adding a corrosion inhibitor or
deaeration treatment.
(3) In a condenser water circuit that uses a closed
cooling tower, the closed circuit circulating water
and make-up water must satisfy its water quality
standards for the hot water system, and passing
water and make-up water must satisfy those for
the circulation type cooling water system.
(4) Supply or make-up water should be tap water
(clean water), industrial water and underground
water except for purified water, neutral water and
softened water or the like.
(5) The fifteen items in the table above represent
typical causes of corrosion and scale.
(6) Passing water may cause corrosion.
Do not use passing water.
After-sales service and warranty
After-sales service:
WARNING
• Do not disassemble, modify or repair the unit.
This may cause water leakage, electric shock or fire.
Contact your dealer.
• If the refrigerant leaks, keep out of fire.
Although the refrigerant does not usually leak, if
the refrigerant leaks out into a room and comes in
contact with the combustible air in the equipment
such as fan heater, stove, oil (gas) cooker, etc., it
will cause toxic gas to be generated.
When a refrigerant leakage failure has been
repaired, confirm a service person that
the leakage point has been corrected
surely before restarting operation.
• Do not remove or reinstall the unit by yourself.
Incorrect installation may cause water leakage,
electrical shock or fire.
Contact your dealer.
• When asking your dealer to repair, inform
related staff of the details as follows:
• Model name and product No. of air conditioner:
• Shipping date and installation date:
Refer to the warranty card.
Refer to the warranty card.
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