Important Information Regarding The Refrigerant Used; Checking The Water Circuit; Connecting The Water Circuit; Water Charge, Flow And Quality - Daikin EUWAC8FZW1 Installation And Operation Manual

Ensure that a protective guard is installed in front of
the air outlet to prevent that the fan blades be
touched. The protection must comply with relevant
European and national regulations.
When connecting the unit to the ducting, a pressure
NOTE
drop will be created and the air flow will be reduced.
The total external pressure drop may not exceed
100 Pa for the EUWAC5 and 150 Pa for the
EUWAC8+10. (For external pressure drop calculation,
refer to "Annex II" on page
The fan pulley has been factory set to work with an
external static pressure of 0 to 150 Pa for the 8 and
10 Hp models. Other pulley settings are possible for
lowering the airflow and thus reducing the sound level
of the unit. But lowering the airflow may lead to
reduced performance (refer to
page 13).
Also refer to "Annex III" on page 17
characteristics.
5 Fasten the unit in place using four anchor bolts.
6 Remove the upper and lower service plate.
7 Connect the drain outlet at one side to the drain. Provide a trap
with a minimum fall of 75 mm in the drain pipe to prevent that the
negative pressure, produced by the fan, disturbs the drain (refer
to figure in chapter "Selection of location" on page
I
MPORTANT INFORMATION REGARDING THE
REFRIGERANT USED
This product contains fluorinated greenhouse gases covered by the
Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type: R407C
(1)
GWP value: 1652.5
(1)
GWP = global warming potential
The refrigerant quantity is indicated on the unit name plate.
C
HECKING THE WATER CIRCUIT
The EUWAC 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.
Before continuing the installation of the EUWAC, check the following
points:
1 A circulation pump must be provided in such a way that it
discharges the water directly into the evaporator. A voltage-free
contact is provided in the switch box to steer the pump.
2 A flow switch must be installed in the water outlet pipe to prevent
the unit from operating at a water flow which is too low. A
terminal is provided in the switch box for the electrical
connection of the flow switch.
3 A wire mesh strainer must be installed at the pump suction to
protect the pump and the heat exchanger from foreign matter.
The mesh size has to be between 0.5 and 1.5 mm.
4 Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance or in
case of shut down.
5 Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible for
servicing. The water inlet pipe is specially designed to obtain a
complete air purge of the evaporator.
Installation and operation manual
3
16)
"Troubleshooting" on
for the fan
2).
6 Provide adequate safeguards in the water circuit to make sure
that the water pressure will never exceed the maximum
allowable working pressure.
C
ONNECTING THE WATER CIRCUIT
Piping connections (water inlet and outlet) must be made from the
right side of the water chiller. (See figure 1)
If air, moisture or dust get 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.
W ,
ATER CHARGE FLOW AND QUALITY
To assure proper operation of the unit, a minimum water volume is
required in the system and the water flow through the evaporator
must be within the operation range, specified in the table below.
EUWAC5
EUWAC8
EUWAC10
The minimum water volume v [kg] in the system should moreover full
fill the criteria below:
v > (Q / 2) x t / (C x y)
Q highest cooling capacity of the unit within the range of
application (kW)
t antirecycling timer of unit (AREC)/2(s)=120 s
C specific heat capacity of the fluidum (kJ/kg°C)=4.186 kJ/kg°C for
water
y steplength (°C)
standard setting=3°C
(refer to the chapter "Operating the
The water quality must be in accordance with the specifications listed
in the table below.
circulating
Items to be controlled
pH at 25°C
Electrical conductivity [mS/m]
at 25°C
-
Chloride ion
[mg Cl /l]
2-
Sulphate ion [mg SO /l]
4
M-alkalinity (pH4.8) [mg CaCO /l]
3
[mg CaCO /l]
Total hardness
3
[mg CaCO /l]
Calcium hardness
3
[mg SiO /l]
Silica ion
2
Items to be referred to
Iron [mg Fe/l]
Copper [mg Cu/l]
2-
Sulphide ion not detectable
[mg S /l]
+
Ammonium ion [mg NH /l]
4
Remaining chloride [mg Cl/l]
[mg CO /l]
Free carbide
2
Stability index
The water pressure should not exceed the maximum work-
ing pressure of 10 bar.
Minimum Maximum
water flow water flow
16 l/min 64 l/min
23 l/min 92 l/min
28 l/min 112 l/min
unit" for adjustments)
tendency if out
water supply water of criteria
6.8~8.0 6.8~8.0 corrosion + scale
<40 <30 corrosion + scale
<50 <50 corrosion
<50 <50 corrosion
<50 <50
<70 <70
<50 <50
<30 <30
<1.0 <0.3 corrosion + scale
<1.0 <0.1 corrosion
not detectable corrosion
<1.0 <0.1 corrosion
<0.3 <0.3 corrosion
<4.0 <4.0 corrosion
— — corrosion + scale
EUWAC5~10FZ
Packaged air-cooled water chillers
4PW14037-1D
scale
scale
scale
scale