Danfoss Akva Lux II GW Fact sheet

Fact Sheet

Akva Lux II GW

Instantaneous water heater for low-temperature district heating

FEATURES AND BENEFITS

• Prepared for low-temperature
district heating

• Very low heat losses

• Cold heat exchanger during
standby, - no standby losses

• DHW controller PTC2+P with integrated
dierential pressure controller
and energy-saving function

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

• Minimized risk of lime scale
and bacteria formation

• Capacity: up to 53 kW DHW

Application

Akva Lux II GW is an instantaneous wa­ter heater featuring high performance.
It meets the future energy demands
for low energy consumption and very
low standby heat losses. It is especially
suitable for large villas with for instance
several bathrooms or jacuzzi and for the
large family, for which an exceptionally
large amount of water is required. The
Akva Lux II GW is also very suitable for
small apartment houses with 2-4 apart­ments.

Construction

The Akva Lux II GW water heater is pre­fabricated with a gasketed, highly e­cient plate heat exchanger for domes­tic hot water production, a domestic
hot water controller Danfoss PTC2+P,
as well as a Danfoss FJVR thermostat
for control of the bypass/circulation
temperature. A circulation set, a safety
set or, if approved by local regulations,
a Danfoss AVE expansion unit to avoid
having to establish a discharge pipe, is
available as optional equipment.

Design

The Akva Lux II GW is designed for
wall-mounting and the design empha­sizes a user-friendly placement of the
controllers. The Akva Lux II GW can be
supplied with a white-lacquered cover
in modern design.

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.

Domestic hot water recirculation

The water heater is prepared for do­mestic hot water circulation. If the
household piping includes hot water
recirculation the water heater must
be connected to the hot water recir­culation system and aa circulation
pump and a non-return valve must
be mounted on the circulation pipe
and a safety valve must be mounted
in the DCW inlet. The pump must be
installed so that it pumps towards
the water heater. Domestic hot water
recirculation ensures that hot water is
available at the tapping point without
waiting time and waste of water. 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. Please note that Akva Lux
II with AVE expansion unit should not
be used on systems with domestic hot
water recirculation.

Heat exchanger for DHW heating

The water heater is based on ahigh­ly ecient gasketed plate heat
exchanger, which is controlled by
a thermostatic and pressure con­trolled DHW controller, Danfoss
PTC2+P with integrated dierential
pressure controller and energy-sav­ing function, which ensures that the
heat exchanger is cold during stand­by. After completion of the tapping
process, the controller immediately
blocks the district heating ow, to
avoid standby losses and to protect
the heat exchanger from the for­mation of lime scale and growth of
bacteria. The heat exchanger is cold
during standby, so the heat loss is
very low. The integrated dierential
pressure controller compensates
for variations in supply temperature
and varying dierential pressure and
thereby ensures a constant hot water
temperature at all times.

Service and maintenance

The water heater 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.

heating.danfoss.com

CIRCUIT DIAGRAM – EXAMPLE

5

6

DHW

1

circ.

1. Gasketed plate heat exchanger in stainless steel, type

2

U141RH

2. Domestic hot water controller Danfoss PTC2+P with energy-saving

function (= cold heat exchanger during standby).

3. By-pass/circulation thermostat Danfoss FJVR.

4. Connection of capillary tube from Danfoss FJVR acting as by-pass
(standard function).

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

Bypass

4

DCW

Design specications

Nominal pressure (prim/sec.): PN 16 / PN 16
Max. supply temperature: 120 °C
DCW static pressure: p
Min. ΔP: see capacity examples
Chloride compounds: max. 300 mg/l

Weight incl. cover: (incl. packing) 17 kg
Cover: White-lacquered steel

Dimensions (mm):

Without cover: H463 × W280 × D230
With cover: H463 × W300 × D240

Connections sizes:

DH, DCW, DHW: G ¾“ ET (ext. thread)
Circulation: R ½“ ET (ext. thread)

DHW DH

= 2.0 bar

min

Supply

3

DH

Return

DHW circulation:

5. Connection of capillary tube from Danfoss FJVR acting as circulation
thermostat.

6. Connection of circulation hose. Circulation set for control
change from bypass to DHW recirculation is not part of the delivery and
must be ordered seperately.

(Please note that AVE must not be used on systems with DHW circulation. For
systems with DHW recirculation the water heater must be supplied with cir­culation pump, non-return valve and safety valve mounted in the cold water
supply).

Connections:

1. Domesctic cold water (DCW)

2. Domestic hot water (DHW)

3. District heating (DH) supply

4. District heating (DH) return

5. Circulation (not part of dly)

Cod e No’s:

Akva Lux II GW

(5)

(5)

Wall

water heater with
heat exchanger

U141RH

Options:

Cover H 430 × W 300 × D 240 mm
AVE pressure equalizer *
Circulation set for mounting on site
Safety valve set

* requires local approval

Cover Code no.:

w/o cover 004U8366
w. cover 004U8367

Top view

DHW: CAPACITY EXAMPLES AT 10°C / 45°C

DHW Capacity

[kW]

32,3 U141RH 55 22 13,16 0,23 840
32,3 U141RH 60 18 13,16 0,16 660
41,0 U141RH 60 20 16,86 0,24 880
53,0 U141RH 60 22 21,84 0,45 1200

*) Stated pressure loss values are complete, incl. pipes. heat exchanger and valves

Plate heat

exchanger

Supply flow primary

[°C]

Return flow primary

[°C]

DHW tap load

[l/min]

Danfoss Redan A/S · District Energy · Omega 7 · DK-8382 Hinnerup
Tel.: [phone] · Fax: [phone] · [e-mail] · www.redan.danfoss.dk

© Danfoss | DHS-SRMT/ PL | 2016 . 11

Pressure loss primary*

[bar]

Flow rate primary

[l/h]

VL.GP.H2.02