Danfoss Akva Lux II VXi Fact sheet

MAKING MODERN LIVING POSSIBLE

Akva Lux II VXi

Fully insulated substation for single-family, semi-detached and
terraced houses

District heating substation for indirect heating and instantaneous domestic
hot water. Innovative DHW temperature control, PTC2+P with energy-saving
function. For wall-mounting with pipes connection in top or bottom

Application

The Akva Lux II VXi is a fully insulated sub­station featuring high performance and
simple operation. The Akva Lux II VX is es­pecially suitable for two-pipe systems and
systems with floor heating. The substation
is available in several capacity variants.

Construction

The Akva Lux II VXi substation is availa­ble in two main types with a plate heat
exchanger for domestic hot water pro­duction type XB 06H-1 26 for 1-2 dwel­lings and heat exchanger type XB 06H-1
40 for 3-4 dwellings. On the heating side
the substation is available with heat ex­changer type XB 06H-26, 40 and type XB
06L-1 24 for floor heating. The Akva Lux
II VXi also features safety and non-return
valve on the cold water connection, ball
valves, sensor pockets, differential pes­sure controller, expansion vessel, ener­gy-efficient circulation pump, thermo­stat, strainers, an energy-saving do­mestic hot water controller Danfoss
PTC2+P, as well as a Danfoss thermo­stat for control of the bypass/circulation
temperature and a flexible fitting pie­ce for mounting of heat meter in the di­strict heating return and supply line. The
substation is prepared for domestic hot
water recirculation.
ture is controlled by an
controller with weather compensation.

Design

The Akva Lux II VXi is designed for wall­mounting and during the construc­tion there has been much emphasis on
a user-friendly placement of all com­ponents. The Akva Lux II VXi is supplied
fully insulated with insulation cover in
modern design.

The heating tempera-

electronic ECL 310

Heat exchanger for DHW heating

The substation is based on a brazed,
highly efficient plate heat exchanger,
which is controlled by a thermostatic
and pressure controlled DHW control­ler, Danfoss PTC2+P with integrated dif­ferential pressure controller and energy­saving function, which ensures that the
heat exchanger is cold during standby.

Bypass (thermostatic circulation)

The water heater is supplied with a ther­mostatically controlled bypass, which
ensures that hot water is produced im­mediately, when tapping starts. The by­pass temperature is set with due consi­deration of the best possible DHW com­fort and economy. The substation is easi­ly rebuilt for application in systems with
DHW recirculation.

Domestic hot water recirculation

The substation is prepared for connec­tion to systems with DHW recirculation.
Switching to DHW recirculation is possi­ble from a constructional point of view,
requiring only mounting of a separate
circulation set (see options). The circu­lation temperature is set independently
of the set DHW temperature. This ensu­res the best possible DHW comfort, very
low standby losses and thus a very good
district heating economy.

Mounting of heat meter

The substation is equipped with 3/4” fit­ting pieces for fitting of a heat meter in
the DH return flow.

Service and maintenance

The substation is very service-friendly
and easy to install. It is mounted on the
wall and as all pipes are placed in pipe

FEATURES AND BENEFITS

• Fully insulated substation for large single­family houses

• Indirect heating, DHW heating based on
flow principle

• Electronic control of heating (HE)
temperature

• Innovative, energy-saving controller PTC2
+ P in combination with high performance
heat exchanger for on-demand water
heating without no-load losses function

• Pipes connection in top or bottom of
substation = Savings in installations costs

• Pipes and heat exchanger made of stainless
steel, connections with EPDM gaskets.

• Minimized risk of lime scale and bacteria
formation

• Electrical wiring from factory - Plug & Play

• Capacity: up to 53 kW DHW ,
Radiator 10-34 kW, Floor heating 8 kW

bracket distance, it is possible to estab­lish a nice piping either in the top or in
the bottom of the substation. The white
removable center part in the front insu­lation allows easy access to components
for regulation and maintenance purpo­ses.

districtenergy.danfoss.com

550

55

360

113,5

1: Fjv. frem
2: Fjv. retur
3: Varme retur
4: Varme frem
5: V.V.
6: K.V
7: Cirk.

POS.

Cirk.ned/QTY.

PART NUMBER

Description

1

1

145H3693

Beslag f. VX-Isol. Instrumentpanel

2

1

145H3695

Beslag VX-Isol. FJV-R

3

1

145H3696

Beslag VX-Isol. FJV-R

4

1

145H3697

Beslag f. VX-Isol Fjv-R

5

1

145H3699

Bagplade VX-Isoleret

6

1

145H3701

Grundfos UPM3 Auto 15-70 130 EUX9

7

1

145H3739

Vinkel 3/8" M mess.

8

1

145H3740

Brystnippel F68 6x3/8" klemring

9

1

145H3749

10

1

145H3753

Cimm 12L

11 1

145H3803

Manometer 0-4 bar m. slæbeviser

12 1 145H3803_1

13 1 145H3803_2
14 1

145H3811

Beslag f. veksler

15 2

145H3812

Beslag f. bundplade isolering

16 1

145H3813

Beslag f. cirk.

17 1

145H3814

Frontplade nederste

18 1

145H3816

Frontplade REDAN

19 6

145H3817

Skrue M5x80 Cyl. hoved indv. 6 kt. DIN
912

20 2

145H3818

Spånskrue 6x30

21 3

145H3819

Skrue EPP 15x32

22 2

145H3820

Skærmskive Ø5.5/30

23 1

145H3821

Ledningsholder

24 1

145H3822

Låseskinne

25 1

145H3825

Tape m. symboler

26 1

145H3826

Label -+

27 1

145H3827

Kapilarrør Ø6x0.7

28 1

145H3828

Kap.rør Ø4x1

29 1

145H3830

Kap. rør Ø4x1

30

2

101001

Pladeskrue 4.2x13

31

2

101010

Pladeskrue 4.2x8

32

1

102218

Skrue M5x65 Cyl. hoved indv. 6 kt. DIN
912

33

9

113206

Popnitte Ø4.8x10 Alu

34

1

125037

Tee 3/4"M x 3/4"N x M14x1

35

1

125121

36

1

125123

37

1

125162

38

1

125165

39

3

125301

40

1

125302

41

1

125305

42

1

125306

Danfoss Standard

A3

1:7.5

Material

SizeScale

Projection

Design

Replace

VX

Designation

E

D

C

B

A

87

6

5

4

3

2

1

kg

Weight

General tolerance accuracy

Akva Lux II VXi

Circuit diagram – example, Akva Lux II VXi with electronic controller ECL 310/A337

16 Expansion vessel
23A Sensor pocket ½”/10x1, plug

M10 for heat meter
23B Plug ½” with O-ring
24 Fitting piece for heat meter

3/4” x 110 mm
25 Controller Danfoss ECL310/

A337
26 Outdoor sensor, ESMT
27 Sensor Danfoss, ESMC
29 Actuator HE, AMV 150
30 Multifunctional control valve

AVQM

DHW

DCW

(Option: Circ.)

1 Plate heat exchanger HE
2 Plate heat exchanger DHW
5 Strainer
6 Non-return valve
7A Ball valve ¾” ext/ext, 120 mm
7B Ball valve ¾” int/ext, for

thermometer
7C Ball valve ¾” ext/ext, DHW/DCW
8 Circulation pump HE
11 Safety valve HE
12 Safety valve DHW
13 Thermometer
15 Manometer

38 PT°C 2 controller
40 Thermostat for bypass/

HE

DH
Supply

Bypass

Supply

circulation

(standard)

DH
Reurn

Design specifications:

Nominal pressure (prim/sec.): PN 16 / PN 3
Max. supply temperature: 120 °C (design temp.)
Min. ΔP: See capacity examples
Brazing material (HEX): Copper

Weight incl. cover: Max. 55 kg
(incl. packing)

Insulation: Polypropylene EPP λ 0.039

Dimensions (mm):

With insulation: H 980 × W 550 × D 360

Eletrical supply: 230 V AC

Connections sizes:

DH: G ¾“ ET (ext. thread)
DCW, DHW, HE: G ¾“ ET (ext. thread)
Circulation: R ½“ ET (ext. thread)

Recirculation:

100 350 100

7

65 100 80 80 80 80 65

1 2 3 4 5 6

1 2 3 4 5

6

54 800 136

HE
Return

Connections:

1. District heating (DH) supply

2. District heating (DH) return

3. Heating (HE) return

4. Heating (HE) supply

5. Domestic hot water (DHW)

6. Domestic cold water (DCW)

7. Circulation

Options:

• Circulation set for DHW recirculation

• KFE filling and drain valve ¼” (for mounting in ball
valve

• Connection of pipes can be established in the top
or in the bottom of the substation

• Mounting of heat meter (supplied by customer)

Remember to order circulation set for systems that feature DHW
recirculation.

DHW: Capacity examples 10 °C/45 °C

DHW

capacity

[kW]

Plate heat

exchanger

Supply flow

primary

[°C]

Return flow

primary

[°C]

DHW

tap load

[l/min]

Pressure

loss

Primary

Flow rate

primary

32.3 XB 06H-1 26 55 21.8 13.16 0.36 840

32.3 XB 06H-1 26 60 18.9 13.16 0.24 680

32.3 XB 06H-1 40 55 19.0 13.16 0.27 770

32.3 XB 06H-1 40 60 17.3 13.16 0.24 680

41.0 XB 06H-1 26 60 20.4 16.83 0.41 890

41.0 XB 06H-1 26 70 16.8 16.83 0.23 660

53.0 XB 06H-1 40 60 19.1 21.67 0.55 1110

53.0 XB 06H-1 40 70 15.7 21.67 0.31 840

Danfoss Redan A/S · District Heating · Omega 7, Søften · DK-8382 Hinnerup · Denmark
Tel.: [phone] · Fax: [phone] · [e-mail] · www.redan.danfoss.dk

VL.JV.V1.02 © Danfoss 02/2017 DKDHR

[l/h]

top view

Heating: Capacity examples

Heating
capacity

2

Floor heating

3

Calculated at 70% of the heating capacity + DHW capacity of 32.3 kW with heat exchanger XB06H-1 26

at a district heating supply temperature of 55

Plate heat
exchanger

19 XB06H-1 26 70/40 35/60
31 XB06H-1 40 70/40 35/60

8 XB06L-1 24

7 XB06H-1 40270/31 30/35
10 XB06H-1 40 60/30 25/55
34 XB06H-1 26 90/44 40/70

HE circuit

primary

2

70/31 30/35

[° C]

HE circuit

secondary

[° C]

2

2

4

°C or 605 °

Pressure loss

primary

(total3) bar

0.40

0.87

0.17

0.17

0.29

0.49

C (DHW 10/45°C) or 656 °

Tot al

5

5

5

5

4

6

Flow rate

primary

(total3) [l/h]

5

920

5

1160

5

660

5

650

4

880

6

840

C (DHW 10/50 °C).