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 ow 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 oor heating. The sub­station is available in several capacity
variants.

District heating (DH)

The substation is prefabricated with in­terconnecting components such as t­ting 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 oor 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, dierent
heat exchangers dimensioned for cen­tral or oor heating can be used.

Domestic hot water (DHW)

The domestic hot water is prepared
in a heat exchanger based on the ow
principle and the temperature is regu­lated by the selfacting controller with
integrated dierential 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 ow
through the heat exchanger, only when
hot water is tapped and blocks the ow
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
dierential pressure controller com­pensates for variations in supply tem-

perature and varying dierential 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 eciency
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 op ­tional and must be ordered separately.

Construction

All pipes are made of stainless steel.
The connections are made by nuts and
gaskets. The substation oers variable
connection possibilities, as connec tion
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.

heating.danfoss.com

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CIRCUIT DIAGRAM – EXAMPLE

DHW

DCW

(Option: Circ.)
DH
Supply

Bypass

DH
Return

Design specications:

Nominal pressure (prim./sec.): PN 16 / PN3
Max supply temperature: 120 °C (design temperature)
Min. ∆P: See capacity examples
Brazing material (HEX): Copper

Weight incl. cover: Max. 60 kg (incl. packing)

Cover: White-lacquered steel

Electrical supply: 230 V AC

Dimensions (mm):

Without cover: H 860 x W 650 x D 365
With cover: H 860 x W 700 x D 380

Connections sizes:

DH: G ¾” (ext. thread)
DCW + DHW + HE + FH: G ¾” (int. thread)
Circulation: G ¾” (ext. thread)

DHW: CAPACIT Y EXAM PLES, 10°C / 45°C

top view

1 Plate heat exchanger HE
2 Plate heat exchanger DHW
5 Strainer
6 Non-return valve
7 Ball valve
8 Circulation pump HE

10 Circulation pump FH
11 Safety valve HE
12 Safety valve DHW
13 Thermometer
14 Pocket for pressure gauge
15 Manometer
16 Expansion vessel
23 Sensor pocket for heat meter

FH
Supply

FH
Return

24 Fitting piece for heat meter

25 Controller Danfoss ECL210/A260
26 Outdoor sensor, ESMT
27 Sensor Danfoss, ESMC
29 Actuator HE, AMV 13
30 Multifunctional control valve

HE
Supply

33 Actuator HE, AMV 150
34 Three-way valve VMV
38 PT°C 2 controller
40 Thermostat for bypass/circ.

HE
Return

----------------------------------------------­Options:

57 Safety thermostat monitor

Connections:

1. District heating (DH) supply

2. District heating (DH) return

3. Heating (HE) return

4. Heating (HE) supply

5. Floor heating (FH) supply

6. Floor heating (FH) return

7. Domestic hot water (DHW)

8. Domestic cold water (DCW)

Options:

• Cover, white-lacquered steel, with door

• Electronic controller Danfoss ECL310

• Circulation set for DHW recirculation

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

• Pipe insulation

• Mounting of heat meter (supplied by customer)

Wall

• Supplementar y tting set for change of tting piece size
¾ x 110 mm to tting piece size 1“ x 190 mm

Recirculation:

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

HEATING: CAPACITY EXAMPLES

3/4” x 110 mm

AHQM

TOTAL

Capacity

[kW]

Plate heat

exchanger

Supply flow

primary

[°C]

Return flow

primary

[°C]

DHW

tap load

[l/min]

Pressure loss

primary

[bar]

Flow rate

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

primary

[l/h]

Capacity

[kW]

Plate heat

exchanger

23 26 70 / 38 33 / 60 0,50
30 40 70 / 38 33 / 60 0,60 1120
10 40 60 / 30 33 / 60 0,27 880
35 26 95 / 41 38 / 70 0,38 760

1

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 552 °C or 603 °C (DHW 10/45°C)
or 654 °C (DHW 10/50 °C).

HE circuit

primary

[°C]

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

© Danfoss | DHS-SRMT/ PL | 2016 . 12

HE circuit

secondary

[°C]

Pressure loss

primary

(total1) [bar]

3

Flow

Primary

(total1) [l/h]

980

VL.GP.W2.02