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, ener- gy-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. The heating temperature is controlled by an electronic ECL 310 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.

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

••Fullyinsulatedsubstationforlargesinglefamilyhouses

••Indirectheating,DHWheatingbasedon flowprinciple

••Electroniccontrolofheating(HE) temperature

••Innovative,energy-savingcontrollerPTC2 +Pincombinationwithhigh performance heatexchangerforon-demandwater heatingwithoutno-loadlossesfunction

••Pipesconnectionintoporbottomof substation=Savingsininstallationscosts

••Pipesandheatexchangermadeofstainless steel,connectionswithEPDMgaskets.

••Minimizedriskoflimescale and bacteria formation

••Electricalwiringfromfactory-Plug&Play

••Capacity:upto53kWDHW, Radiator10-34kW,Floorheating8kW

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.

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Akva Lux II VXi

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

DHW

DCW	(Option: Circ.)
DH
Supply	Bypass
	(standard)
DH
Reurn

1	Plate heat exchanger HE	16	Expansion vessel
2	Plate heat exchanger DHW	23A	Sensor pocket ½”/10x1, plug
5	Strainer		M10 for heat meter
6	Non-return valve	23B	Plug ½” with O-ring
7A	Ball valve ¾” ext/ext, 120 mm	24	Fitting piece for heat meter
7B	Ball valve ¾” int/ext, for		3/4” x 110 mm
	thermometer	25	Controller Danfoss ECL310/
7C	Ball valve ¾” ext/ext, DHW/DCW		A337
8	Circulation pump HE	26	Outdoor sensor, ESMT
11	Safety valve HE	27	Sensor Danfoss, ESMC
12	Safety valve DHW	29	Actuator HE, AMV 150
13	Thermometer	30	Multifunctional control valve
15	Manometer		AVQM
		38	PT°C 2 controller
	HE	40	Thermostat for bypass/
			circulation
	Supply
	HE
	Return

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:

			550
100			350			100
						<![if ! IE]> <![endif]>54
						<![if ! IE]> <![endif]>800
					7	<![if ! IE]> <![endif]>136
65	100	80	80	80	80	65
1		2	3	4	5	6
1		2	3	4	5	6

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.

top view

DHW: Capacity examples 10 °C/45 °C

	DHW	Plate heat	Supply flow	Return flow	DHW	Pressure	Flow rate
	capacity		primary	primary	tap load	loss	primary
		exchanger
	[kW]		[°C]	[°C]	[l/min]	Primary	[l/h]
	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

Heating: Capacity examples

Total

Heating

Plate heat

HE circuit

HE circuit

Pressure loss

Flow rate

primary

secondary

primary

primary

capacity

exchanger

[° C]

[° C]

(total3) bar

(total3) [l/h]

19

XB06H-1 26

70/40

35/60

0.405

9205

31

XB06H-1 40

70/40

35/60

0.875

11605

8

XB06L-1 242

70/31

30/352

0.175

6605

7

XB06H-1 402

70/31

30/352

0.175

6505

10

XB06H-1 40

60/30

25/55

0.294

8804

34

XB06H-1 26

90/44

40/70

0.496

8406

2Floor heating

3Calculated 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 554 °C or 605 °C (DHW 10/45°C) or 656 °C (DHW 10/50 °C).

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

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