Danfoss VX Akva Lux II 2H Fact sheet

VX Akva Lux II 2H

Substation for single-family, semi-detached and terraced houses

District heating substation for indirect heating, with two heating circuits and instantaneous domestic hot water. Designed for wall-mounting. Connection of pipes in top or bottom of substation.

Application

The VX Akva Lux II 2H is a substation featuring high performance and simple operation. The VX Akva Lux II 2H is especially suitable for two-pipe systems and systems with floor heating. The substation is available in two variants, - one variant with an electronic controller ECL 300/C62 for control of the two heating circuits and with a self-acting controller for control of the DHW circuit and another variant with an electronic controller ECL 301/L76 for control of all circuits.

District heating (DH)

Thesubstationisprefabricatedwithinterconnecting components such as fitting piece for heat meter, mounted in the district heating return pipe and sensor pockets for insertion of a heat meter, as well as strainer, ball valves, thermometers and manometers.

Heating (HE)

The substation features two heating circuits with two separate stainless steel plate heat exchangers, safety valve, manometer, thermometers, strainers, air valve, outlet for expansion vessel and circulation pumps. Each heating circuit is controlled by an electronic actuator and a two-way valve, placed on the district heating side, in combination with an electronic temperature controller with an outdoor temperature sensor.

Domestic hot water (DHW)

The domestic hot water is prepared in a highefficient heat exchanger, and for optimum control of the DHW temperature two control variants are available:

Self-acting control of DHW temperature

Combined hydraulic and thermostatic regulation of DHW through the self-acting controller with integrated differential pressure controller, - the PTC2 + P controller.

The use of hydraulic regulation widely prevents the formation of lime scale and bacteria due to the fact, that the valve closes immediately after the tapping is ended. Furthermore the combined control function compensates for variations in temperature in the district heating network. A thermostatic by-pass enables tapping of hot water without delay. The cold water connection includes a combined ball valve/non-return valve and safety valve.

This variant is equipped with by-pass function as a standard, but it is prepared for DHW circulation. Switching to DHW circulation is possible from a constructional point of view, requiring only mounting of a separate circulation set (not part of the delivery).

Electronic control of DHW temperature

The domestic hot water is controlled by an electrical actuator and a two-way valve in combination with the ECL controller. This

variant is applicable only on systems with DHW circulation. Separate circulation set for DHW circulation is part of the delivery and must be mounted on site.

Construction

All pipes are made of stainless steel, connected with nuts and gaskets. The substation offers variable connection possibilities, as connection of pipes can be established both in the top or in the bottom of the substation. The VX Akva Lux II 2H can be delivered with white-lacquered steel cover, with door.

FeATURES AND BENEFITS

•Substation for large single-family houses

•Indirect heating, DHW heating based on flow principle

•Self-acting or electronic control of DHW temperature

•Capacity: 15-30 kW HE / 7-14 kW FH,

60 kW DHW

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

•Pipes and plate heat exchanger made of stainless steel

•Minimized risk of lime scale and bacteria formation

•Electrical wiring from factory - Plug & Play

VL.GP.C1.02. © Danfoss 09/2010

VX Akva Lux II 2H

Circuit diagram - example, variant with self-acting control of DHW temperature

	1 Plate heat exchanger HE
	2 Plate heat exchanger DHW
	5	Strainer
	6 Non-return valve
	7	Ball valve
		HE
DHW		Supply
Circ.		HE
		Return
DCW
DH		HE
Supply	Bypass	Supply
DH		HE
Return		Return

8 Circulation pump HE

11Safety valve HE

12Safety valve DHW

13Thermometer

14Pressure gauge ½”

15Manometer

16Expansion vessel

17Air screw 23

23Sensor pocket for heat meter

24Fitting piece for heat meter 3/4” x 110 mm

25Controller Danfoss ECL300/C62

26Outdoor sensor, ESMU

27Sensor Danfoss, ESMC

29Actuator HE, AMV 150

302-way valve VS2

38 PT°C 2 controller

40 Thermostat for bypass/circ.

-------------------------------------------

61 Circulation pipe (option)

62 Non-return valve (option)

64 Circulation pump (option)

Technical parameters:
Nominal pressure:	PN 16
DH supply temperature:	Tmax	= 120 °C
DCW static pressure:	pmin	= 2,5bar
Brazingmaterial(HEX):	Copper
Weight incl. cover:	52kg
(incl. packing)
Cover:	White-lacquered
	steel
Electrical supply:	230V AC
Dimensions (mm):
Without cover:	H 860 xW 660 x D 380
Withcover:	H860xW700xD400
Connections sizes:
DH:	G ¾”(ext. thread)
DCW + DHW + HE:	G ¾”(int. thread)

			700
<![if ! IE]> <![endif]>30	110	175		200			215
<![if ! IE]> <![endif]>610								<![if ! IE]> <![endif]>780 860
	1	2	3 4	5	6	7	8	9
	85 100 130 656565656560 Wall
<![if ! IE]> <![endif]>44	1	2	3 4 5		6 7		8	9

<![if ! IE]>

<![endif]>400

Top view

*(Expansionvesselincl.bracket&T-pieceispartofthe delivery, but must be mounted on site, - piping is not part of the delivery.)

Connections:

1.District heating (DH) supply

2.District heating (DH) return

3.Circulation

4.Heating(HE)return

5.Heating(HE)supply

6.Floor heating (FH) supply

7.Floor heating (FH) return

8.Domestic hot water (DHW)

9.Domestic cold water (DCW)

Options:

•Cover,white-lacqueredsteel,withdoor

•Insulationofcover

•CirculationsetforDHWcirculation(forVXAkva

Lux II H2 with self-acting control of DHW)

DHW: Capacity examples, 10 °C/58 °C

	DHW	Plate heat	Supply	Return	DHW	Pressure	Flow rate
	Capacity		flow	flow	Tap load	loss	Primary
		exchanger	Primary	Primary		prim.
	kW				l/min		l/h
			°C	°C		*bar
	60,0	XB 37H-1 40	70	20.3	18	0,57	1040

* Heat meter not incl.

Heating: Capacity examples - two circuits

	Heating		Heating	Heating	Pressure loss	Flow rate
		Plate heat	circuit	circuit
	capacity				Primary	Primary
		exchanger	Primary	Secondary
	kW				(total***) bar*	(total***) l/h
			°C	°C
	2 x 15	XB06L-1 24	115/42.7	40/70	0.62	900
	2 x 7	XB06L-1 24	115/40.1	40/45**	0,20	710

*Heat meter not incl. **Floor heating

***Calculated on the basis of 100% heat flow rate + DHW capacity of 60kW at 115°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.GP.C1.02 © Danfoss 09/2010

DKDHR