Daikin VRVWII RWEYQ30MY1 Operation Manual - Page 17

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01_EN_3P153897-1.fm Page 12 Wednesday, March 2, 2005 3:32 PM
• 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.

10. 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)
Circulation
Make-up
water
water
Standard items
pH(25°C)
6.5 to 8.2
6.0 to 8.0
Electrical Conductivity
Less than
Less than
(mS/m)(25°C)
80
30
Chloride ions
Less than
Less than
–
(mgcl
/L)
200
50
Sulfate ions
Less than
Less than
2-
(mgSO
/L)
200
50
4
Acid consumption
Less than
Less than
(pH4.8)
(mgCaCO
/L)
100
50
3
Total hardness
Less than
Less than
(mgCaCO
/L)
200
70
3
Calcium hardness
Less than
Less than
(mgCaCO
/L)
150
50
3
Ionic-state silica
Less than
Less than
(mgSiO
/L)
50
30
2
Reference items
Less than
Less than
Iron (mgFe/L)
1.0
0.3
Less than
Less than
Copper (mgCu/L)
0.3
0.1
Shall not
Shall not
Sulfate ion
be
be
2-
(mgS
/L)
detected
detected
Ammonium ion
Less than
Less than
+
1.0
0.1
(mgNH
/L)
4
Residual chlorine
Less than
Less than
(mgCl/L)
0.3
0.3
Free carbon dioxide
Less than
Less than
(mgCO
/L)
4.0
4.0
2
Stability index
6.0 to 7.0
–
[NOTES]
(1) The circle marks in the columns for corrosion or
scale to develop.
English
Hot water system (2)
Tendency (1)
Circulation
water
Make-up
Corrosion Scale
(20°C ~
water
60°C)
!
!
7.0 to 8.0
7.0 to 8.0
Less than
Less than
!
!
30
30
Less than
Less than
!
50
50
Less than
Less than
!
50
50
Less than
Less than
!
50
50
Less than
Less than
!
70
70
Less than
Less than
!
50
50
Less than
Less than
!
30
30
Less than
Less than
!
!
1.0
0.3
Less than
Less than
!
1.0
0.1
Shall not
Shall not
!
be
be
detected
detected
Less than
Less than
!
0.3
0.1
Less than
Less than
!
0.25
0.3
Less than
Less than
!
0.4
4.0
!
!
–
–
(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:
Refer to the warranty card.
• Shipping date and installation date:
Refer to the warranty card.
• Malfunction:
Inform the staff of the defective details.
(Malfunction code being displayed on
the remote controller.)
• Name, address, telephone number
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