Danfoss Akva Lux II TDP-F / Akva Vita II TDP-F Operating instructions

Brand: Danfoss

Model: Akva Lux II TDP-F / Akva Vita II TDP-F

Type: Operating instructions

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

District heating ﬂat station for direct heating and

instantaneous domestic hot water

Akva Lux II TDP-F / Akva Vita II TDP-F

Instructions

Table of contents EASY START-UP ........................................................................2

Types / Main components ...................................................3

General / Mounting & Start-up ..........................................4

Description ...............................................................................6

Heating circuit .........................................................................6

Domestic hot water ...............................................................8

DHW circulation ......................................................................9

Troubleshooting HE ...............................................................14

Troubleshooting DHW ..........................................................16

Maintenance ............................................................................17

EU Declaration of conformity.............................................19

Primary SecondaryDomestic hot water

DHW DCW HE

return

supply

return

DCW

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

1. The substation is prepared for wall-mount-

ing. The mounting sheet on the back of the

substation has got holes for screw installa-

tion. Fasten the substation on the wall with

two screws, bolts, expansion bolts or the

like.

2. Prior to installation any unused connections

and shut-oﬀ valves should be sealed with a

plug.

3. Mount heat meter (see page 5).

4. IMPORTANT! Due to vibrations during trans-

port all connections must be checked and

tightened before the installation.

5. For systems with safety valve, connection

for drain must be established in compliance

with local regulations.

6. For installations with domestic hot water

circulation remember to switch from bypass

to DHW circulation control and to install

circulation pump and non-return valve.

Connect pump to power supply, but do not

switch on the pump (see item 10). Please

see instructions for domestic hot water

circulation control.

Mounting - start-up 7. Fill the heat exchanger / the system with

water. Then carefully open the ball valves

on HE supply, HE return and DH supply. Sub-

sequently open the ball valve on DH return

(Please note that the ball valves are not part

of the delivery).

8. Check the substation and the domestic

installation carefully for any leakage.

9. Perform pressure testing of the domestic

installation according to local regulations.

10. Switch on circulation pump, if any.

11. Heat up the system and vent the the system

by means of the air vents on the substation

and on the radiators, - (see pages 5 and 17).

12. Finally adjust the substation according to the

enclosed installation instructions.

13. IMPORTANT! Heating and cooling of the sys-

tem may cause leakages. Therefore tighten-

ing of all connections may be necessary after

commencement of operation.

EASY START-UP!

Dimensioned sketch /

Connections:

1 DCW inlet

2 DHW

3 DCW outlet

4 DH supply

5 DH return

6 HE supply

7 HE return

Depth: 150 mm

Connections size:

¾” IT

Type A Type B

Mounting and start-up.

Please follow the below start-up instructions.

Mounting holes

460 mm

21 3 4 5 6

65 mm 65 mm65 mm 65 mm

575 mm

65 mm 65 mm

21 3 4 5 6

65 mm 65 mm65 mm 65 mm

65 mm 65 mm

440 mm

550 mm

Mounting holes

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Type A

Types:

A. Akva Lux II TDP-F with FJVR

mounted after heat meter

B. Akva Lux II TDP-F with FJVR

mounted before heat meter

Components

1 Plate heat exchanger DHW

2 Diﬀerential pressure controller

3 Thermostat for bypass/circulation

4 PTC2+P controller (Akva Lux II TDP-F)

4 PM2+P controller (Akva Vita II TDP-F)

5 Fitting piece for heat meter

6 Sensor pocket for heat meter

7 Return temperature limiter

8 Zone valve

9 Air vent

10 T-piece (w. plug ½”)

11 Strainer w. plug ½”

12 Fitting piece for cold water meter,

hot water meter

13 Flow regulator

14 Strainer

Please note:

Your substation may look diﬀerent than the

substation shown, as variants with other

components may be supplied.

Instructions for the ﬁtted components will

always be supplied together with the sta-

tion.

Type B

Safety notes

Storage

To avoid injury of persons and damages to the

device, it is absolutely necessary to read and

observe these instructions carefully.

Necessary assembly, start-up and maintenance

work must be performed by qualified and

authorized personnel only.

Please comply with the instructions of the system

manufacturer or system operator.

Unused connections and shut-oﬀ valves must be

sealed with a plug. The plugs must be removed by

an authorized service technician only.

Choice of materials

Choice of materials always in compliance with

local legislation

Warning of high pressure and temperature

The maximum temperature of the ﬂow medium

in the Akva Lux II TDP-F and Akva Vita II TDP-F is

100 °C.

The maximum operating pressure of the substation

is 10 bar.

Be aware of the installation’s permissible system

pressure and temperature.

The risk of persons being injured and equipment

damaged increases considerably if the recom-

mended permissible operating parameters are

exceeded.

We recommend that the substation is equipped

with safety valve, however, always in compliance

with local regulations.

Warning of hot surface

The substation has got hot surfaces, which can

cause skin burns. Please be extremely cautious in

close proximity to the substation.

Warning of electric shock risk

Before cleaning or servicing disconnect power

supplies.

Warning of transport damage

Before substation installation, please make sure

that the substation has not been damaged during

transport.

Sound level

≤ 55 dB

Corrosion protection

All pipes and components are made of stainless

steel and brass.

The maximum chloride compounds of the ﬂow

medium should not be higher than 300 mg/l.

The risk of equipment corrosion increases consi-

derably if the recommended permissible chloride

compounds are exceeded

If the substation is stored before installation, make

sure that the place is dry and heated.

Disposal

This product consists of materials which must not

be disposed of together with domestic waste.

Dismantle the product and sort the components

in various groups before disposal. Observe the

disposal rules of the local legislation..

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Mounting

The substation must be installed and connected by

authorized service personnel only.

Installation must be in compliance with the local

standards and regulations.

Allow for adequate space around the substation for

mounting and maintenance purposes.

Prior to the substation installation all substation

pipes and connections should be cleaned and

rinsed.

The substation should be wall-mounted. The

mounting sheet on the back of the substation has

got holes for screw installation.

A symbol for each of the diﬀerent connections is

placed on the substation.

Tightening of connections

Due to vibrations during transport all connections

must be checked and tightened before the

substation is installed.

After observing that the substations operates

in accordance with the dimensioning basis, the

connections must be tightened again and the

substation can be taken into continuous use.

Heat meter assembly, ﬁtting piece

The ﬂat station is equipped with a ﬁtting piece for

insertion of a heat meter.

Assembly of heat meter

Loosen nuts from ﬁtting piece, remove ﬁtting

piece and replace with heat meter.

After mounting of heat meter remember to

check all threaded connections and tighten if

necessary.

DCW meter (option)

The substation can be equipped with a ﬁtting

piece for insertion of DCW meter.

Assembly of DCW meter

Please refer to above assembly instructions for

heat meter.

Filling, start-up

Prior to the Akva Lux II TDP-F and Akva Vita II TDP-F

installation all its pipes and connections should be

cleaned and rinsed. After that the strainers should

be cleaned.

Before starting-up, check if:

- pipes are connected according to the circuit

diagram,

- release valves are shut oﬀ,

- threaded and ﬂanged connections are

tightened.

Fill the heat exchanger / the system with water:

1) Carefully open ball valves on HE supply,

HE return and DH supply.

2) Finally open the ball valve on DH return.

(Please note that the ball valve are not part of the

delivery).

After that the shut-oﬀ valves should be opened

and the operation of the substation must be

observed (e.g. temperatures, pressure, thermal

expansion, leakages). After h

eat-up of the system

it should be vented by means of the air vents on

the substation and on the radiators

After that the operation of the substation must

be observed. If the substation operates

in accord-

ance with the designed parameters, it can be

taken into continuous use.



All Danfoss plate heat exchangers and substations

have been pressure tested prior to delivery.

Electrical connection 230 V AC

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

District heating substation for direct heating for

single-family, semi-detached and terraced hous-

es as well as ﬂats. With one heating circuit and in-

stantaneous water heater for domestic hot water

heating. Designed for wall mounting.

Description

General PLEASE NOTE that other variants may be supplied.

The control function, however, is basically as de-

scribed below. Please always observe the enclosed

producer instructions for the mounted controller.

Heating circuit

Temperature control

The required room temperature is controlled by

radiator thermostats (ﬁxed setting throughout the

year).

It is recommended that all radiators are opened a

little in each room.

The diﬀerential pressure controller reduces the

ﬂuctuating pressure in the district heating net-

work to a small and invariable operating pres

sure

in the substation and thereby ensures the best

possible operating conditions for radiator thermo-

stats, which enables individual control of the room

temperature.

The diﬀerential pressure controller is preset from

factory and should not be adjusted afterwards

Diﬀerential pressure

controller

Return temperature limiter Return temperature limiters are used to limit the

return temperature of radiators.

The return temperature limiter FJVR is a self-act-

ing P-band regulator, which regulates according

to the temperature of the heating medium.

The FJVR includes a thermostatic element and a

valve body. Once the set temperature is exceeded,

the valve shuts down and re-opens only when the

temperature has dropped below the set value.

The return temperature limiter should be set to

the required maximum return temperature, in

compliance with the local demands.

Approximate thermostat scale setting:

I = 10° C

1 = 20 °C

2 = 30 °C

3 = 40 °C

4 = 45 °C

I = 50 °C (max. temperature)

To ensure suﬃcient cooling and proper operation

the HE return temperature must be lower than

the temperature set on the ﬂow controller.

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Option

Electronic programmable

room thermostat

The Akva Lux II TDP-F ﬂat station can be equipped

with a zone valve, and thereby the substation can

be supplied with an electronic programmable

room thermostat.

In this case temperature is controlled by the room

thermostat and radiator thermostats. Please note

that the room thermostat keeps the temperature

at a constant level in the whole apartment accor-

ding to the set room parameters.

Consult additional maintenance instructions for-

room thermostat for further information. It is re-

commended to avoid fully opened thermostats

on some radiators and fully shut-oﬀ on others.

Higher temperature at the top and lower tempe-

rature at the bottom part of radiators means that

the system operation is correct. To keep correct

temperature and friendly microclimate for human

beings in the apartment, it is recommended to en-

sure regular airing in rooms.

Note:

Before mounting of the

electronic room thermo-

stat, an actuator must

be mounted on the zone

valve.

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Description - Akva Lux II TDP-F

The domestic hot water is prepared in the heat ex-

changer based on the ﬂow principle and the tem-

perature is controlled by the combined hydraulic

and thermostatic self-acting controller PTC2+P

with integrated diﬀerential pressure controller (1).

Description - Akva Vita II TDP-F

The domestic hot water is prepared in the heat

exchanger based on the ﬂow principle and the

temperature is controlled by the hydraulic self-act-

ing controller PM2+P with integrated diﬀerential

pressure controller (2).

PTC2+P controller for domestic hot water (1).

The DHW temperature setting is adjusted with

the handle for temperature setting, by turning the

handle in “+” direction (warmer), or “-” direction

(colder). The temperature should be set to 45-50 °C

at normal use (7-8 l/min.) The temperature should

never exceed 55 °C to avoid lime scale precipita-

tion in the heat exchanger.

PM2+P controller for domestic hot water (2).

The DHW temperature setting is adjusted with the

handle in “red” direction (warmer), or in “blue” di-

rection (colder). The temperature should be set to

45-50 °C at normal use (7-8 l/min.) The tempera-

ture should never exceed 55 °C to avoid lime scale

precipitation in the heat exchanger.

FJVR thermostat for bypass

As a standard the substation is equipped with

a bypass thermostat, Danfoss FJVR with return

temperature limiter 10/50 C° , which ensures that

hot water is available immediately, when tapping

starts. It is recommended to set the thermostat

in pos.3.

If the water temperature rises too slowly it can be

necessary to set the thermostat at higher value.

Circulation thermostat

Switching to DHW circulation control is possible

from a constructional point of view, requiring only

an additional circulation set. The components for

DHW circulation are not part of the delivery and

must be ordered separately and mounted on site.

If the substation is connected to the DHW circulation

system in the building, the FJVR thermostat (3) will

function as a circulation thermostat and control

the circulation water temperature, independently

of the set DHW temperature. It is recommended to

set the thermostat in pos 3.

For DHW circulation control 3 circulation sets are

available as optional equipment:

The 3 circulation sets and control change pos-

sibilities from bypass to DHW circulation will be

described on the following pages.

Please note that this description applies both to

Akva Lux II TDP-F and Akva Vita II TDP-F.

Approximate scale setting

Pos. 2 = 30°C

3 = 40°C

4 = 45°C

Domestic hot water

DHW temperature control

Bypass thermostat (standard)

DHW circulation

Control change from bypass to

circulation

Handle for temperature setting

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

3 + 6

3 + 4

Connection of capillary

tube by means of

union nut +

cutting ring

• Demountplugs in pos. A and B (6 mm Allen

key).

• Mount3/8”x3/4”hexagonnipple,3/4Ø21,4

mm union nut and ½” x 28,5 mm hexagon

nipple in pos. A (pack) (for mounting of circula-

tion pipe (not part of the delivery)).

• Mount1/4”x6mmhexagonnippleinpos.B

(pack).

• Demountcapillarytubeandunionnutinpos.

C and D (scrap).

• Plugtheholeinpos.Cwithunionnut+ball

plug in pos. C.

• Demount3/4”pluginpos.E

• DemountFJVRthermostatin(F).Unscrew3/4”

reducer bushing from FJVR thermostat and

scrap.

• Mount3/4”plug+gasketinpos.(F).

• MountFJVRthermostatinpos.(E).

• Fitnewcapillarytubefrom(D)to(B)bymeans

of union nut and cutting ring.

Connection

of capillary

tube for

circulation

Connection of

circulation pipe

Union nut + ball plug

Union nut +

cutting ring

Control change from bypass to

DHW circulation

Circulation set 1

1) 1 pc. 3/8” x 3/4” hexagon nipple

2) 1 pc. 1/4”x 6 mm hexagon nipple

3) 3 pc. union nut 6 mm

4) 1 pc. ball plug

5)1pc.capillarytubeØ6mm

6) 2 pc. cutting ring

7)1pc.3/4Ø21,4mmunionnut

8) 1 pc. ½” x 28,5 mm hexagon

nipple

(Please note that this circulation set

is prepared for application in other

substation types too. - Therefore

excess components may occur and

we ask you please to ignore these).

Remember circulation pump and non-

return valve assembly (this is not part of

the delivery and must be ﬁtted remotely

on site).

The pump must pump water in direction

towards the substation.

3 + 6

7 + 8

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

• Demountplugs in pos. A and B (6 mm Allen

key).

• Mount3/8”x3/4”hexagonnippleinpos.A

(pack) and mount circulation pipe in hexagon

nipple.

(Please note that the width of the station will

increase by 120 mm).

• Mount1/4”x6mmhexagonnippleinpos.B

(pack).

• Demountcapillarytubeandunionnutinpos.

C and D (scrap).

• Plugtheholeinpos.Cwithunionnut+ball.

• Demount3/4”pluginpos.E.

• DemountFJVRthermostatin(F).Unscrew3/4”

reducer bushing from FJVR thermostat and

scrap.

• Mount3/4”plug+gasketinpos.(F).

• MountFJVRthermostatinpos.(E).

• Fitnewcapillarytubefrom(D)to(B)bymeans

of union nut and cutting ring.

Control change from bypass to

DHW circulation

Circulation set 2

1) 1 pc. 3/8” x 3/4” hexagon nipple

2) 1 pc. 1/4”x 6 mm hexagon nipple

3) 3 pc. union nut 6 mm

4) 1 pc. ball plug

5)1pc.capillarytubeØ6mm

6) 2 pc. cutting ring

7) 1 pc. hexagon nipple ½” x ½”

8) 1 pc.circulation pipe ø15 mm

(Please note that this circulation set

is prepared for multiple applica-

tions. - Therefore excess compo-

nents may occur and we ask you

please to disregard these).

Remember circulation pump and non-

return valve assembly (this is not part of

the delivery and must be ﬁtted remotely

on site).

The pump must pump water in direction

towards the substation.

3 +6

3 + 4

Connection of capillary

tube by means of union

nut + cutting ring

Connection

of capillary

tube for

circulation

Connection of

circulation pipe

Union nut + ball plug

Union nut +

cutting ring

3 + 6

7 +8

4 + 5

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

• Demountplugs in pos. A and B (6 mm Allen

key).

• Mount3/8”x3/4”hexagonnippleinpos.A

(pack) and mount circulation pipe in hexagon

nipple.

(Please note that the width of the station will

increase by 120 mm).

• Mount1/4”x6mmhexagonnippleinpos.B

(pack).

• Demountcapillarytubeandunionnutinpos.

C and D (scrap).

• Plugtheholeinpos.Cwithunionnut+ball.

• Demount3/4”pluginpos.E.

• DemountFJVRthermostatin(F).Unscrew3/4”

reducer bushing from FJVR thermostat and

scrap.

• Mount3/4”plug+gasketinpos.(F).

• MountFJVRthermostatinpos.(E).

• Fitnewcapillarytubefrom(D)to(B)bymeans

of union nut and cutting ring.

Control change from bypass to

DHW circulation

Circulation set 3

1) 1 pc. 3/8” x 3/4” hexagon nipple

2) 1 pc. 1/4”x 6 mm hexagon nipple

3) 3 pc. union nut 6 mm

4) 1 pc. ball plug

5)1pc.capillarytubeØ6mm

6) 2 pc. cutting ring

7) 1 pc. hexagon nipple ½” x ½”

8) 1 pc.circulation pipe ø15 mm

9) 1 pc. pump Wilo Star-Z 15

10) 1 pc. non-return valve

(Please note that this circulation set

is prepared for multiple applica-

tions. - Therefore excess compo-

nents may occur and we ask you

please to disregard these)

Remember circulation pump and non-

return valve assembly (this is not part of

the delivery and must be ﬁtted remotely

on site).

The pump must pump water in direction

towards the substation.

3 + 6

Connection of capillary

tube by means of union

nut + cutting ring

Connection of

capillary tube

for circulation

Connection of

circulation pipe

Union nut + ball plug

Union nut +

cutting ring

3 + 6

8 + 9 + 10

The bypass thermostat FJVR can be mounted be-

fore the heat meter

This applies to Akva Lux II TDP-F / Akva Vita II TDP-F,

type B and for these types the control change

from bypass to DHW circulation must be done as

follows, by means of the previously described cir-

culation sets 1, 2 and 3:

• Demountplugsinpos.A und B (6 mm Allen

key).

• Mount3/8”x3/4”hexagonnippleinpos.A

(pack) and mount circulation pipe in the

hexagon nipple..

• Mount1/4”x6mmhexagonnippleinpos.B

(pack).

• Demountcapillarytubeandunionnutinpos.

C and D (scrap).

• Plugtheholeinpos.Cwithunionnut+ball

plug.

• Fitnewcapillarytubefrompos.Dtopos.Bby

means of a union nut and cutting ring.

Control change from bypass to

DHW circulation

(Please note that this circulation set

is prepared for multiple applica-

tions. - Therefore excess compo-

nents may occur and we ask you

please to disregard these)

Remember circulation pump and non-

return valve assembly (this is not part of

the delivery and must be ﬁtted remotely

on site).

The pump must pump water in direction

towards the substation.

Connection

of circulation

pipe

Connection of

capillary tube for

circulation

6 mm

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Circulation pump Pump start-up

Do not start up the pump until the system has been

ﬁlled with the ﬂow media. The pump vents itself au-

tomatically after a short operational period. Short-

term dry-running will not harm the pump.

For more information about the pump please refer

to enclosed installation and maintenance instruc-

tions:

WILO-STAR-Z 15

Installation and Maintenance Instructions.

D Einbau- und Betriebsanleitung

GB Installation and operating instructions

F Notice de montage et de mise en service

NL Inbouw- en bedieningsvoorschriften

Instrucciones de instalación y funcionamiento

I Istruzioni di montaggio, uso e

manutenzione

GR Οδηγίες εγκατάστασης και λειτουργίας

S Monterings- och skötselanvisning

FIN Asennus- ja käyttöohje

DK Monterings- och skötselanvisning

H Beépítési és üzemeltetési utasítás

PL Ins trukcja montażu i obsługi

CZ Návod k montáži a obsluze

RUS Инструкция по монтажу и

эксплуатации

LV Instalēšanas un ekspluatācijas instrukcijas

SK Návod na montáž a obsluhu

Wilo-Star-Z 15

4 106 234-Ed.02 / 2008-02-Wilo

PN 10

PN 30

I-230 V

50 Hz

22 W

Imax 0,25mA

Flow regulator A ﬂow regulator is a control device, which, ir-

respectively of mains pressure, maintains the

designated ﬂow rate. This means that the ﬂow

regulator automatically equalizes all changes in

pressure within a large pressure range (normally

1 to 10 bar), and thereby ensures a constant.

ﬂow regardless of water supply pressure.

Even at low pressures the required ﬂow is ob-

tained. At high pressures no unnecesssary water

is wasted.; in fact much water and energy can be

saved by using ﬂow regulators.

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Troubleshooting

Heating

Problem Possible cause Solution

No heat

Strainer clogged on DH or HE

side (radiator circuit)

Filter in district heating meter

clogged

Defective or wrongly set diﬀe-

rential pressure controller

Defective room thermostat/

actuator

Motor valve defective - or pos-

sibly dirt in the valve housing

Automatic controls wrongly set

or defective - possibly power

failure

Air pockets in the system

Clean strainer.

Clean the ﬁlter (after consult-

ing the district heating plant).

Check the functioning of the

diﬀerential pressure controller

- clean valve seat if required.

Check the functioning of the

room thermostat / actuator.

Check the functioning of valve

- clean valve seat if required.

Check if the setting of the con-

troller is correct - see separate

instructions. Check the power

supply.

Vent the installation thorough-

ly.

Uneven heat distribution Air pockets in the system

Vent the installation thorough-

Supply temperature too high

Wrong setting of automatic

controls

Defective controller. The

controller does not react as it

should in accordance with the

instructions

Adjust automatic controls,

see instructions for automatic

controls.

Call in automatic controls

manufacturer or replace

controller.

Supply temperature too low

Wrong setting of automatic

controls

Defective controller. The

controller does not react as it

should in accordance with the

instructions

Strainer clogged

Adjust automatic controls,

see instructions for automatic

controls.

Call in automatic controls

manufacturer or replace

controller.

Clean strainer

If operating disturbances occur, the following

basic features should be checked before carrying

out actual troubleshooting:

- the substation is connected to electricity (ap-

plies only to substations with room thermostat)

- the strainer on the district heating supply is

clean,

- the district heating ﬂow temperature is at the

normal level (summer, at least 60 °C, winter at

least 70 °C),

- the diﬀerential pressure is higher than or equal

to the normal (local) diﬀerential pressure in the

district heating network. - if in doubt, ask the

district heating plant,

- there is pressure on the system.

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Problem Possible cause Solution

Unzureichende Kühlung

Too small heating surface/too

small radiators compared to

the total heating requirement

of the building.

Poor utilization of existing

heating surface.

The system is single-pipe.

Increase heating surface

Make sure the heat is

distributed evenly across the

full heating surface – open

all radiators and keep the

radiators in the system from

heating up at the bottom.

Higher temperature at the

top and lower temperature at

the bottom part of radiators

means that the system

operation is correct.

It is extremely important to

keep the supply temperature

to the radiators as low as ever

possible, while maintaining a

reasonable level of comfort.

Troubleshooting

Heating

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Troubleshooting

Domestic hot water

PM 2 + P controller

PTC2 + P controller

Problem Possible cause Solution

In general: Does the controller

work incorrectly

If the quantity of tap water

is normal (temperature

unimportant), it indicates that

the controller works correctly.

Locate defect in another part of

the installation

(see below).

In general: Are the operating

conditions satisfactory?

The substation requires a

DH supply temperature

of minimum 60 °C and a

diﬀerential pressure during

operation according to the

information stated in the

product sheet

Contact district heating sup-

plier.

DHW tap load too low;

Tap temperature too low;

Tap temperature ﬂuctuates

- Strainer in DH supply

clogged.

- Defective non-return valve in

thermostatic battery (DHW

tap temperature lower than

DHW from unit).

- Defective non-return valve in

hot water circulation (circula-

tion return pipe is getting

cold during tapping of hot

water).

- Lime scale precipitation in

plate heat exchanger for DHW

(Δt primary too low during

DHW tapping).

- DCW ﬂow too high (big nomi-

nal diameter of pipe, high

DCW pressure), in total max.

16-17 litres per minute.

Clean strainer.

Clean or replace non-return

valve.

Clean or replace non-return

valve

Replace the plate heat

exchanger.

DCW reduction.

DH return water temperature

too high while on standby;

The plate heat exchanger is

cold…

The bypass thermostat is

defective or wrongly adjusted.

Replace or adjust bypass ther-

mostat correctly.

DH return water temperature

too high while on standby;

The plate heat exchanger is

hot…

Short-circuiting of plate heat

exchanger or defective control-

ler.

Replace plate heat exchanger or

controller.

DH return temperature too

high during hot water tapping.

Lime scale precipitation in the

plate heat exchanger for DHW.

Replace the plate heat

exchanger.

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

The substation requires little monitoring, apart

from routine checks and cleaning of strainers. To

ensure the best operating conditions regular in-

spection of the substation and a check of all re-

levant operating parameters are recommended,

for example in connection with meter reading.

Meter reading

We recommend that you read your meter regu-

larly and that you write down the meter read.

Cooling / Return temperature reading

The cooling, i.e. the temperature diﬀerence be-

tween district heating supply and district heating

return is of great importance for the total heat

economy. It is therefore very important to observe

the supply and return temperatures. Normal tem-

perature diﬀerence is 30-35 °C

Cleaning

All strainers should be checked and cleaned at

least once every year, typically in connection with

start-up of the heating system.

Tightening of connections

All threaded and ﬂanged connections should be

checked and tightened in connection with meter

reading. All threaded and ﬂanged connections

should be tightened regularly and especially in

connection with start-up after the summer pe-

riod.

Venting of system

Always vent the radiators and the substation be-

fore the heating season by means of the air vents

on the substation and on the radiators.

Safety valve

The safety valves’ task is to protect the substation

from pressures exceeding the permissible pressure.

The blow-oﬀ pipe of the safety valves must not be

closed. The blow-oﬀ pipe outlet should be placed

so that it provides safety relief and it is possible to

observe water dropping from the safety valves.

It is advisable to check the operation of the safety

valves by turning the valve head in the indicated

direction.

Strainer

Strainers should frequently be cleaned from

sediments by authorized personnel, according

to producer’s instructions and dependent on the

substation’s operating conditions.

Maintenance

Meter reading

Cooling

Cleaning

Tightening

Venting

Safety valve

Strainer

Notes:

Instructions Akva Lux II TDP-F / Akva Vita II TDPS-F

VI.GE.R1.02 · Produced by Danfoss Redan A/S · 05.2010

VI.GE.R1.02 Produced by Danfoss Redan A/S · 05.2010

DECLARATION OF CONFORMITY

We, the manufacturer

Danfoss Redan A/S

Omega 7, Søften

DK-8382 Hinnerup

Tel.: +45 87438943

Fax: +45 87438944

do hereby declare that the following products:

Danfoss Redan Substations

are in conformity with the following directives and standards:

2006/95/EC, Low Voltage Directive

2004/108/EC, EMC Directive

Applied Standards:

EN 60 335 – 1

EN 55 014

EN 61 000 – 6 – 2

EN 61 000 – 6 – 3

This declaration of conformity is provided that the given instructions are followed and that no

alterations are made by third party.

Place: Date:

Director, Operations:

DK-8382 Hinnerup 30/10 2008

Danfoss Redan A/S

Omega 7, Søften

DK-8382 Hinnerup

Telefon: +45 87438943

Telefax: +45 87438944

redan@danfoss.com

www.redan.danfoss.dk

VI.GE.R1.02 · Produced by Danfoss Redan A/S · 05.2010

Instructions Akva Lux II TDP-F / Akva Vita II TDP-F

Danfoss Akva Lux II TDP-F / Akva Vita II TDP-F Operating instructions

Danfoss Akva Lux II TDP-F / Akva Vita II TDP-F Operating instructions

Danfoss Akva Lux II TDP-F / Akva Vita II TDP-F Operating instructions

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