Danfoss Akva Lux II Se Fact sheet

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Fact Sheet

AkvaLuxIISefully insulated substation

for direct heating w/mixing loop and instantaneous domestic hot water for single-family, semi-detached and terraced houses

Application

Akva Lux II Se is a fully insulated district heating substation for direct heating with mixing loop and instantaneous domestic hot water, featuring high performance and simple operation. The Akva Lux II Se covers both the DHW and heating requirements of large and small single-family houses and is also suitable for large projects.

Construction

The Akva Lux II Se substation is available in two main types with a plate heat exchanger for domestic hot water production type XB 06H-1 26, XB 06H-1 40 or XB 06H+ 60.

The substation also features safety and nonreturn valve on the cold water connection, ball valves and sensor pockets as well as a differential pressure controller, energy-efficient circulation pump, strainers, bypass valve, an energy-saving domestic hot water controller Danfoss PTC2+P, and a removable fitting piece for installation of heat meter in the district heating supply and return line.

The heating temperature is controlled by an electronic ECL 310 controller with weather compensation, which enables further energy savings.

The heating side features a mixing loop, which provides a suitable temperature level e.g. for floor heating.

The substation is suitable and ready for connecting re-circulation and leak detection equipment.

Design

The design emphasizes a user-friendly placement of all components.

The Akva Lux II Se is supplied with an elegant insulation cover and the removable cover plate in the front insulation allows easy access to components for regulation and maintenance purposes.

The unit is delivered as standard with pipe connection downwards, but a mounting plate and pipe set are available as optional equipment, enabling pipe connection to be made in top.

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 PTC2+P DHW controller.

The Danfoss PTC2+P DHW controller with integrated differential pressure controller and energy saving function ensures that the heat exchanger is cold during standby.

Bypass (thermostatic circulation)

The substation 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 DHW comfort and energy savings balance. DHW re-cir- culation can be easily added to the substation when it is required.

FEATURES AND BENEFITS

•Possibility to connect LeanHeat Monitor for remote parameters setting and monitoring

•Fully insulated with very low heat losses

•Direct heating, DHW heating based on flow principle

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

•Ensuring the lowest return temperature by special Danfoss technologies specifically developed for substations

•Customer-specific solutions, specially adapted to the applicable technical regulations

•Advanced electronic control of heating (HE) with weather compensation.

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

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

•Capacity: 35-55 kW DHW, HE 20 kW

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 return temperature and thus a very good district heating economy.

Mounting of heat meter

The substation is equipped with 3/4” fitting pieces in the DH return or supply flow for fitting of a heat meter, - alternatively in both DH return and supply flow for leak detection.

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 bracket distance, it is possible to establish a nice piping. The removable cover plate in the front allows easy access to the specially designed chamber where most frequently used components such as ECL310 and PTC2+P are located. The easy access chamber enables faster commissioning and maintenance without removing the whole cover of the substation. Calculator of the heat meter can also be mounted into this chamber for easy reading.

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CIRCUIT DIAGRAM ( EXAMPLE)

DHW

DCW

Supply

Return

1	Plate heat exchanger DHW	26	Outdoor sensor, ESMT
4.	Diff. pressure controller	27	Danfoss sensor, ESMC
5	Strainer	29	Danfoss actuator HE, AMV 150
5A	Filter for PTC2	30	Thermostatic valve VS2
6	Non-return valve	38	PTC2+P controller
6A	Non-return valve insert	40	Thermostat for Bypass/Re-circ.
7	Ball valve	--------------------------------------
10	Circulation pump	Options (not part of delivery):
12	Safety valve DHW, 10 bar	61	Circulation pipe 2
13	Thermometer	62	Non-return valve
14	Manometer connection	64	Circulation pump
23	Sensor pocket ½”for heat meter	1For meters with 1 “thread, order a separate
24	Flex. fitting piece for heat meter	fitting set, see table below
25	3/4” x 110-165 mm1	2 Circulation pipe set for DHW re-circulation
25	Danfoss Controller ECL 310/A230	must be purchased as an option, see below
		must be purchased as an option, see below

Supply

Return

Design specifications:
Nominal pressure (primary):	PN16
Nominal pressure (DHW):	PN10
Max. supply temperature:	110 °C (design temp.)
Min. ΔP:	See capacity examples
Brazing material (HEX):	Copper
Weight:	Max. 24 kg
Insulation:	Polypropylene
	EPP λ 0.039
Electrical supply:	230 V AC
Dimensions (mm):
with insulation:	H 785 × B 550 × T 315
Connections sizes:
DH, DCW, DHW, HE:	G ¾“ IT (ext. thread)
Circulation:	R ½“ ET (ext. thread)

Recirculation:

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

Dimensional sketch:

315

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

Basic type		Code No
Type 1 PWH, EPP insulated cover		145B5190
Type 2 PWH, EPP insulated cover		145B5191
Type 3* PWH, EPP insulated cover		145B5192
Type 1 StS* PWH, EPP insulated cover		145B5193
Type 2 StS* PWH, EPP insulated cover		145B5194

*Suitable for low temperature district heating at supply temperatures in the range 50-70°C.

**StS = Stainless steel

	Option prices (loose delivery)	Option
	Circulation set incl. pipe for mounting on site	145H4438
	Mounting plate for connection of pipes in	145H4855
	top of substation	145H4855
	top of substation
	Pipe set (2 pipes) for mounting plate	145H4856
	Cover plate in the front insulation	183L5003

DHW: CAPACITY EXAMPLES 10 °C/50 °C							HEATING: CAPACITY EXAMPLES				TOTAL
Plate heat	DHW	Supply flow	Supply flow	Pressure	Flow rate	DHW	HE	HE circuit,∆t	HE circuit,∆t	Flow rate	Pressure loss	Flow rate
exchanger	capacity	primary	secondary	loss	primary	tap load	capacity	primary	secondary	primary	primary	primary
exchanger	capacity	primary	secondary	Primary	primary	tap load	capacity	primary	secondary	primary	primary	primary
HEX	[kW]	[°C]	[°C]	Primary	[l/min]	[l/min]	[kW]	[°C]	[°C]	[l/min]	[total ***bar]	(total3) [l/h]
				[*bar]
XB06H-1 26	35,0	65	22	25	714	12,5	9	25	5	310	0.421	10701
Typ 1	35,0	90	16	8	414	12,5	9	40	5	194	0.282	8702
XB06H-1 40	55,0	65	25	49	1116	19,7	9	50	5	155	0.163	6603
Typ 2	55,0	90	16	16	636	19,7	10	25	15	344	0.302	9302
XB06H+ 60	32,3	55	20	24	800	13,3	15	30	20	430	0.332	9902
Typ 3	41,0	55	21	40	1030	17,2	15	30	30	430	0.332	9902
* Stated pressure loss values are incl. of pipes, HEX and valves							20	40	40	430	0.293	8203
							15	30	30	430	0.444	12104
							15	30	30	430	0.444	12104

*** Calculated at 70% of the heating capacity + DHW capacity of 32.3 kW at a district heating supply temperature of 551, 602 or 703 °C.

4) Combination with 70% of the heating capacity + DHW capacity 41 kW (60+ HEX)

AM391471895971en-010101