Daikin VRV W T-series, Operation Manual, Page: 37 / 44

English 36
● Check the fan speed setting on your remote controller.
Refer to “Operation procedure”.
● Check for open doors or windows.
Shut doors and windows to prevent wind from coming in.
● Check if there are too many occupants in the room during cooling operation.
● Check if the heat source of the room is excessive during cooling operation.
● Check if direct sunlight enters the room during cooling operation.
Use curtains or blinds.
● Check if the air flow angle is proper.
Refer to “Operation procedure”.
● Check if the entering water temperature of the outside unit is within the operation range.
Do not exceed the operation range.
● Check if the water flow rate of the outside unit water is within the operation range.
Do not exceed the operation range.
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 makeup water (4) (6)
Item (5)
Cooling water system (3)
Hot water system (2) Tendency (1)
Circulation system
Circulation water Makeup water
Circulation water
(68 to 140°F(20 to 60°C)) Makeup water
Corrosion Scale
Standard items
pH (77°F(25°C)) 6.5 to 8.2 6.0 to 8.0 7.0 to 8.0 7.0 to 8.0
 
Electrical
Conductivity
(mS/ft(mS/m))(77°F(25°C))
Less than 24.4(80) Less than 9.1(30) Less than 9.1(30) Less than 9.1(30)
 
Chloride ions
(mgcl˜/L)
Less than 200 Less than 50 Less than 50 Less than 50

Sulfate ions
(mgSO
42-
/L)
Less than 200 Less than 50 Less than 50 Less than 50

Acid consumption
(pH4.8)
(mgCaCO
3
/L)
Less than 100 Less than 50 Less than 50 Less than 50

Total hardness
(mgCaCO
3
/L)
Less than 200 Less than 70 Less than 70 Less than 70

Calcium hardness
(mgCaCO
3
/L)
Less than 150 Less than 50 Less than 50 Less than 50

Ionic-state silica
(mgSiO
2
/L)
Less than 50 Less than 30 Less than 30 Less than 30

Reference items
Iron (mgFe/L) Less than 1.0 Less than 0.3 Less than 1.0 Less than 0.3
 
Copper (mgCu/L) Less than 0.3 Less than 0.1 Less than 1.0 Less than 0.1

Sulfate ion
(mgS 2- /L)
Shall not be
detected
Shall not be
detected
Shall not be
detected
Shall not be
detected

Ammonium ion
(mgNH
4+
/L)
Less than 1.0 Less than 0.1 Less than 0.3 Less than 0.1

Residual chlorine
(mgCl/L)
Less than 0.3 Less than 0.3 Less than 0.25 Less than 0.3

Free carbon dioxide
(mgCO
2
/L)
Less than 4.0 Less than 4.0 Less than 0.4 Less than 4.0

Stability index 6.0 to 7.0 — — —
 