Daikin ECB1MUW, Installation Manual

EUWN16~ ECB1~3MUW

Packaged water-cooled water chillers

4PW13852-1

Installation manual

3

C

HECKING

THE

WATER

CIRCUIT

The units are equipped with water inlets and water outlets for connec-
tion to a chilled water circuit and to a hot water circuit. These circuits
must be provided by a licensed technician and must comply with all
relevant European and national regulations.

Before continuing the installation of the unit, check the following
points:

1

A circulation pump must be provided in such a way that it dis-
charges the water directly into the heat exchanger.

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 (<1 mm) must be installed at the pump
suction as to protect the pump and the heat exchanger from
foreign matter.

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.

6

Shut-off valves should be provided at the unit so that normal
servicing can be accomplished without draining the system.

7

Vibration eliminators in all water piping connected to the chiller
are recommended to avoid straining the piping and transmitting
vibration and noise.

W

ATER

QUALITY

SPECIFICATIONS

 A = corrosion 

B = scale

C

ONNECTING

THE

WATER

CIRCUIT

The evaporator and condenser are foreseen of GAS male pipe thread
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.

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 as specified in the table below.

P

IPING

INSULATION

The complete water circuit, inclusive all piping, must be insulated to
prevent condensation and reduction of the cooling capacity.

Protect the water piping against water freezing during winter period
(e.g. by using a glycol solution or heatertape).

evaporator water

condenser water

circulating 

water

[<20°C]

supply 

water

circulating 

water

[20°C~60°C]

supply 

water

tendency 

if out of 

criteria

Items to be controlled

pH

at 25°C

6.8~8.0

6.8~8.0

7.0~8.0

7.0~8.0

A + B

Electrical 
conductivity

[mS/m]

at 25°C

<40

<30

<30

<30

A + B

Chloride ion

[mgCl

-

/l]

<50

<50

<50

<50

A

Sulfate ion

[mgSO

4

2-

/l]

<50

<50

<50

<50

A

M-alkalinity 
(pH4.8)

[mgCaCO

3

/l]

<50

<50

<50

<50

B

Total hardness

[mgCaCO

3

/l]

<70

<70

<70

<70

B

Calcium 
hardness

[mgCaCO

3

/l]

<50

<50

<50

<50

B

Silica ion

[mgSiO

2

/l]

<30

<30

<30

<30

B

Items to be referred to

Iron

[mgFe/l]

<1.0

<0.3

<1.0

<0.3

A + B

Copper

[mgCu/l]

<1.0

<0.1

<1.0

<0.1

A

Sulfide ion

[mgS

2-

/l]

not detectable

A

Ammonium ion

[mgNH

4

+

/l]

<1.0

<0.1

<0.3

<0.1

A

Remaining 
chloride

[mgCl/l]

<0.3

<0.3

<0.25

<0.3

A

Free carbide

[mgCO

2

/l]

<4.0

<4.0

<0.4

<4.0

A

Stability index

—

—

—

—

A  +  B

Minimum 

water volume (l)

Minimum 

water flow

Maximum 

water flow

16Hp

205

62 l/min

247 l/min

20Hp

268

80 l/min

321 l/min

24Hp

311

93 l/min

373 l/min

32Hp

205

123 l/min

493 l/min

36Hp

268

142 l/min

568 l/min

40Hp

268

161 l/min

642l/min

44Hp

311

173 l/min

694 l/min

48Hp

311

186 l/min

745 l/min

52Hp

205

204 l/min

814 l/min

56Hp

205

222 l/min

889 l/min

60Hp

268

241 l/min

963 l/min

64Hp

268

254 l/min

1015 l/min

68Hp

268

267 l/min

1066 l/min

72Hp

311

280 l/min

1118 l/min

The water pressure should not exceed the maximum
working pressure of 10 bar.

NOTE

Provide adequate safeguards in the water circuit to
make sure that the water pressure will never exceed
the maximum allowable working pressure.