Water Quality Specifications; Piping Work - Daikin EWWD440AAYNNO series Installation And Operation Manual

Water quality specifications
The quality of chilled (hot) water largely affects the performance and
life time of this unit. It is therefore very important to check the water
quality before using it, and to keep monitoring the quality of water
after installing the unit.
Water quality standard values for the water shall be as in the table.
Items to be controlled
pH at 25°C
Electrical conductivity [mS/m] at 25°C
Chloride ion [mg Cl
Sulfate ion [mg SO
M-alkalinity (pH 4.8) [mg CaCO
Total hardness [mg CaCO
Calcium hardness [mg CaCO
Silica ion [mg SiO
Items to be referred to
Iron [mg Fe/l]
Copper [mg Cu/l]
Sulfide ion [mg S
Ammonium ion [mg N
Remaining chloride [mg Cl/l]
Free carbide [mg CO
Stability index
(A) corrosion (B)
CAUTION
Use chilled/hot water and condenser water that
complies with water quality specifications.
Deterioration of water quality may lead to water leakage,
etc.

Piping work

All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and
national regulations.
The units are equipped with a water inlet and water outlet for
connection to a chilled water circuit. This circuit must be
provided by a licensed technician and must comply with all
relevant European and national regulations.
The evaporator and condenser are foreseen of flanges for the
water inlet and outlet (refer to the outlook diagram). Evaporator
and condenser water connections are to be made in accordance
with the outlook diagram, respecting the water in- and outlet.
If air, moisture or dust gets in the water circuit, problems may
occur. Therefore, always take into account the following when
connecting the water circuit:
1. Use clean pipes only.
2. Hold the pipe end downwards when removing burrs.
3. Cover the pipe end when inserting it through a wall so that no
dust and dirt enter.
Before continuing the installaiton of the unit, check the following
points:
1. Measures against vibration
Mount the expansion joint near the unit so that operation
vibration of the unit does not propagate to the equipment
system.
Equip the piping with supports at appropriate points.
Installation and operation manual
8
condenser water
circulating system
circulating
water supply water
6.5~8.2 6.0~8.0
<80 <30
–
<200 <50
/l]
2 –
<200 <50
/l
4
/l]
<100 <50
3
/l]
<200 <70
3
/l]
<150 <50
3
/l]
<50 <30
2
<1.0 <0.3
<0.3 <0.1
2–
not detectable
/l]
+
/l] <1.0 <0.1
4
<0.3 <0.3
/l]
<4.0 <4.0
2
6.0~7.0 —
scale (C) corrosion+scale
evaporator water
once through
system
circulating
once through water
water [<20°C] supply water
6.8~8.0 6.8~8.0
<40 <40
<50 <50
<50 <50
<50 <50
<70 <70
<50 <50
<30 <30
<1.0 <1.0
<1.0 <1.0
not detectable not detectable
<1.0 <1.0
<0.3 <0.3
<4.0 <4.0
— —
2. Supplying a proper flow to the unit
A circulation pump must be provided in such a way that it
discharges the water directly into the evaporator.
3. Removing foreign materials
Periodic cleaning of the scale adhered to the inside of the
unit is required.
For the sake of facilitating the cleaning, provide the water
piping system with stopvalves at both inlet and outlet sides.
In addition, for ease of opening the water chamber of the
condenser and evaporator, we recommend to use short
pipes with flanges at both the water piping side and the unit
side.
For periodic cleaning and maintenance, provide valves for
release to atmosphere, drain off valves and valves for
chemical cleaning between stopvalves provided in the water
piping system and the unit body.
For drain off valves, lay down the drain piping to the drain
ditch.
heated water
low temperature
circulating
water
[20°C~60°C] supply water
6.8~8.0 7.0~8.0 7.0~8.0
<30 <30 <30
<50 <50 <50
<50 <50 <50
<50 <50 <50
<70 <70 <70
<50 <50 <50
<30 <30 <30
<0.3 <1.0 <0.3
<0.1 <1.0 <0.1
not detectable
<0.1 <0.3 <0.1
<0.3 <0.25 <0.3
<4.0 <0.4 <4.0
— —
Pump interlocks must be installed in the water
outlet pipe to prevent the unit from operating at a
water flow which is too low. 3 terminals are
provided in the switch box for the electrical
connection of the pump interlock.
Improper installation of the pump interlock can
result in severe damage of the equipment.
A wire mesh strainer must be installed at the inlet
of the heat exchanger to protect the heat
exchanger from foreign matter. Distance between
the inlet of the heat exchanger and the wire mesh
strainer must be <0.5 m.
Improper installation of the wire mesh strainer will
result in severe damage of the equipment.
Packaged water-cooled water chillers
tendency if
out of criteria
(C)
(C)
(A)
(A)
(B)
(B)
(B)
(B)
(C)
(A)
(A)
(A)
(A)
(A)
— (C)
EWWD440~850AAYNNO**
4PW25558-1B