Danfoss Akva Lux II VX H2WP Fact sheet

Fact Sheet

Akva Lux II VX H2WP

District heating substation for single-family, semi-detached and terraced houses

FEATURES AND BENEFITS

•• Substation for large single-family 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

•• Capacity: 20-30 kW HE/ 41-53 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

Application

The Akva Lux II VX H2WP is a substation featuring high performance and simple operation. The Akva Lux II VX H2WP is especially suitable for two-pipe systems and systems with floor heating. The substation is available in several capacity variants.

District heating (DH)

The substation is prefabricated with interconnecting components such as fitting piece and sensor pockets for insertion of a heat meter, as well as strainers, ball valves, thermometers and pockets for pressure gauges.

Heating (HE)

The heating side features a pleate heat exchanger and two heating circuits. The radiator heating circuit consists of a safety valve, non-return valve, manometer, thermometers, strainer, expansion vessel, ball valves, multifunctional control valve, actuator and circulation pump, and the floor heating circuit consists of a non-return valve, thermometers, safety thermostat, strainer, ball valves, threeway valve, actuator and circulation pump. The temperature for the heating circuits is controlled by an electronic

temperature controller with an outdoor temperature sensor. Depending on substation’s application, different heat exchangers dimensioned for central or floor heating can be used.

Domestic hot water (DHW)

The domestic hot water is prepared in a heat exchanger based on the flow principle and the temperature is regulated by the selfacting controller with integrated differential pressure controller - the PTC2+P with esaveTM function. Supreme ease of operation is obtained via the combined hydraulic and thermostatic regulation of the PTC2+P controller. The pressure-controlled part allows primary and secondary side flow through the heat exchanger, only when hot water is tapped and blocks the flow immediately after completion of the tapping process. The thermostatic part controls the domestic hot water temperature. Thanks to the quickacting hydraulic control of the heat exchanger, it is largely protected from the formation of lime scale and growth of bacteria. The PTC2+P controller with integrated differential pressure controller compensates for variations in supply tem-

perature and varying differential pressure and thereby ensures a constant domestic hot water temperature at all times. A thermostatic bypass enables tapping of hot water without any delay,

– ensuring the best possible efficiency and economy. The cold water connection includes a combined ball valve/ non-return valve and safety valve.

Domestic hot water recirculation

The Akva Lux II VX H2WP is equipped with bypass function as a standard, but it is prepared for DHW recirculation. Switching to DHW recirculation is possible from a constructional point of view, requiring only mounting of a separate circulation set (see options). Equipment for DHW recirculation is optional and must be ordered separately.

Construction

All pipes are made of stainless steel. The connections are made by 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 Akva Lux II VX H2WP can be delivered with white-lacquered steel cover, with door.

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	CIRCUIT DIAGRAM – EXAMPLE
	1	Plate heat exchanger HE	10	Circulation pump FH
	2	Plate heat exchanger DHW	11	Safety valve HE
	5	Strainer	12	Safety valve DHW
	6	Non-return valve	13	Thermometer
	7	Ball valve	14	Pocket for pressure gauge
	8	Circulation pump HE	15	Manometer
			16	Expansion vessel
			23	Sensor pocket for heat meter
	DHW	FH	24	Fitting piece for heat meter
		Supply		3/4” x 110 mm
			25	Controller Danfoss ECL210/A260
		FH	26	Outdoor sensor, ESMT
			27	Sensor Danfoss, ESMC
		Return
	DCW		29	Actuator HE, AMV 13
			30	Multifunctional control valve
	(Option: Circ.)
				AHQM
	DH	HE	33	Actuator HE, AMV 150
	Supply	Supply	34	Three-way valve VMV
	Bypass		38	PT°C 2 controller
	DH	HE	40	Thermostat for bypass/circ.
			-----------------------------------------------
	Return	Return	Options:
			57	Safety thermostat monitor
	Design specifications:	Connections:

Nominal pressure (prim./sec.):	PN 16 / PN3		1. District heating (DH) supply
Max supply temperature:	120 °C (design temperature)		2. District heating (DH) return
Min. ∆P:	See capacity examples		3. Heating (HE) return
Brazing material (HEX):	Copper		4. Heating (HE) supply
Weight incl. cover:	Max. 60 kg (incl. packing)		5. Floor heating (FH) supply
			6. Floor heating (FH) return
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Cover:	White-lacquered steel		7. Domestic hot water (DHW)
Electrical supply:	230 V AC		8. Domestic cold water (DCW)
			Options:
Dimensions (mm):
			• Cover, white-lacquered steel, with door
Without cover:	H 860 x W 650 x D 365
			• Electronic controller Danfoss ECL310
With cover:	H 860 x W 700 x D 380		• Circulation set for DHW recirculation
Connections sizes:			• Connection of pipes can be established in the top or in
			the bottom of the substation
DH:	G ¾”(ext. thread)
			• Pipe insulation
DCW + DHW + HE + FH:	G ¾”(int. thread)		• Mounting of heat meter (supplied by customer)
Circulation:	G ¾” (ext. thread)	Wall	• Supplementary fitting set for change of fitting piece size
			¾ x 110 mm to fitting piece size 1“ x 190 mm
			Recirculation:
	top view		Remember to order circulation set for systems that
			feature DHW recirculation.

DHW: CAPACITY EXAMPLES, 10°C / 45°C

	Capacity	Plate heat	Supply flow	Return flow	DHW	Pressure loss	Flow rate
			primary	primary	tap load	primary	primary
	[kW]	exchanger
			[°C]	[°C]	[l/min]	[bar]	[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	60z	18,9	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

	Capacity	Plate heat	HE circuit	HE circuit
			primary	secondary
	[kW]	exchanger
			[°C]	[°C]
	23	26	70 / 38	33 / 60
	30	40	70 / 38	33 / 60
	10	40	60 / 30	33 / 60
	35	26	95 / 41	38 / 70

Pressure loss	Flow
primary	Primary
(total1) [bar]	(total1) [l/h]
0,503	980
0,603	1120
0,272	880
0,384	760

1Calculated 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 552 °C or 603 °C (DHW 10/45°C)

or 654 °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

© Danfoss | DHS-SRMT/ PL | 2016 . 12

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