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Installation and maintenance manual

Large installation Drainback

Solar DrainbackDB40S

DB50DB100DB150

en

Dear customer,Thank you for purchasing this equipment.

Before using the product, please read this manual carefully and keep it in a safe place for future reference. In order to ensure continued safe and efficient operation, we recommend that the product is regularly inspected and maintained. Our after-sales and maintenance department can help you with this.

We trust that this product will deliver exceptional performance for many years.

3

Contents

Solar DrainbackEN7662865 - v07 - 20102017

Table of contents1 Safety 5

1.1 General safety instructions 5

1.1.1 General safety 5

1.1.2 Electrical safety 6

1.2 Recommendations 6

2 About this manual 8

2.1 General Information 8

2.2 Symbols used 8

3 Technicalspecifications 9

3.1 Directives 9

3.2 Technical data 9

3.3 Dimensions and connections 10

3.3.1 DB40S 10

3.3.2 DB50 and DB100 11

3.3.3 DB150 12

3.4 Electrical diagram 13

3.4.1 DB40S 13

3.4.2 DB50, DB100 and DB150 13

4 Description of the product 14

4.1 Description of the product 14

4.2 Operating principle 15

4.3 Main components 16

4.3.1 DB40S 16

4.3.2 DB50, DB100 and DB150 16

4.4 Standard delivery 17

5 Before installation 18

5.1 Installation regulations 18

5.2 Electrical requirements 18

5.3 Design of the installation 18

5.3.1 Location dimensions 18

5.3.2 Accumulator location 18

5.3.3 Minimum incline 19

5.3.4 Balancing valves 19

5.3.5 Installation examples 20

5.3.6 Pipe diameter calculation 30

5.3.7 Checking the volume 30

5.3.8 Quantity of antifreeze 31

6 Installation 32

6.1 General 32

6.2 Hydraulic diagram 32

6.2.1 DB40S 32

6.2.2 DB50, DB100 and DB150 33

6.3 System connection 33

6.4 Filling the installation 34

4

Contents

Solar Drainback EN7662865 - v07 - 20102017

6.4.1 General 34

6.4.2 Checks before filling 34

6.4.3 DB40S 35

6.4.4 DB50, DB100 and DB150 35

6.4.5 Checks after filling 36

7 Solar control 37

7.1 Description of the Basic solar control 37

7.1.1 Keys 37

7.1.2 System monitoring screen 37

7.1.3 Channel indicator 37

7.1.4 Symbol bar 37

7.1.5 System diagram 38

7.2 Description of the Premium solar control 38

7.2.1 Keys and dial 38

8 Frequency inverter 40

8.1 General 40

8.2 Description of the frequency inverter 40

8.2.1 Functions of the screen and keys 40

8.3 Auto adjustment 41

8.4 Automatic mode 42

9 Commissioning 43

9.1 General 43

9.2 Checklist before commissioning 43

9.3 DB40S commissioning procedure 43

9.3.1 Procedure 43

9.3.2 Basic factory setting values 44

9.4 Commissioning procedure for the DB50, DB100 and DB150 44

9.4.1 Procedure 44

9.4.2 Premium factory setting values 46

10 Maintenance 49

10.1 General 49

10.2 Standard servicing and maintenance operations 49

11 Troubleshooting 50

11.1 General malfunctions 50

11.2 DB40S malfunctions 51

11.3 DB50, DB100 and DB150 malfunctions 51

12 Decommissioning 52

12.1 Decommissioning procedure 52

12.2 Recommissioning procedure 52

13 Disposal 53

13.1 Disposal and recycling 53

5

1 Safety


1 Safety

1.1 General safety instructions

1.1.1 General safety

DangerThis appliance can be used by children aged 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they are given correct supervision or instruction on using the appliance in complete safety and understand the hazards involved. Children must not play with the appliance. Cleaning and user maintenance must not be carried out by children without supervision.

Danger of electrocutionBefore any work, switch off the power supply to the appliance.

CautionUse only genuine spare parts.

NoteOnly qualified professionals are permitted to install the appliance, in accordance with prevailing local and national regulations.

WarningDo not touch the pipes. Depending on the settings, the temperature of the pipes may exceed 60 °C.

WarningTake care with the domestic hot water. Depending on the settings, the temperature of the domestic hot water may exceed 60 °C.

WarningOnly qualified professionals are authorised to work on the appliance and system installation.

6

1 Safety


NoteThe installation must comply with all the provisions of the current regulations and directives governing work and interventions in individual homes, blocks of flats and other buildings.

1.1.2 Electrical safety

CautionIf the appliance is supplied with a power supply cable which is damaged, it must be replaced by the manufacturer, its After-Sales department or persons with similar qualifications in order to avoid any danger.

NoteThe installation must comply with all the provisions of the current regulations and directives governing work and interventions in individual homes, blocks of flats and other buildings.

CautionDo not neglect to service the appliance. Contact a qualified professional or take out a maintenance contract for the annual maintenance of the appliance

1.2 Recommendations

CautionThe installation must comply with all the provisions of the regulations (DTU, EN, etc.) governing work and interventions in individual homes, blocks of flats or other buildings.

NoteKeep the appliance accessible at all times.

NoteRegularly check that the system is operating correctly.

7

1 Safety


NoteNever remove or cover the labels and data plates affixed to appliances. The labels and data plates must be legible throughout the entire service life of the appliance.Damaged or illegible instructions and warning stickers must be replaced immediately.

NoteOnly remove the casing to perform maintenance and repair work. Refit the casing after maintenance and repair work.

8

2 About this manual


2 About this manual

2.1 General Information

This manual is intended for installers of Solar Drainback systems.

2.2 Symbols used

This manual uses various danger levels to draw attention to certain special instructions. This is to improve user safety, prevent potential problems and guarantee that the appliance operates correctly.

DangerRisk of dangerous situations that may result in serious personal injury.

Danger of electrocutionRisk of electric shock.

WarningRisk of dangerous situations that may result in minor personal injury.

CautionRisk of material damage.

NoteHighlights important information.

AdviceReference to other manuals or pages in this manual.

9

3 Technical specifications



3.1 Directives

This product complies with the requirements of the following European Directives and standards:• Electromagnetic Compatibility Directive 2004/108/EC

Generic standards: EN 61000-6-3, EN 61000-6-1Relevant Standard: EN 55014

• 2006/95/EC Low Voltage DirectiveGeneric standard: EN 60335-1

For all provisions and Directives referred to in these instructions, it is agreed that all addenda or subsequent provisions will apply at the time of installation.

3.2 Technical data

Tab. 1 Technical data for Solar Drainback systems

DB40S DB50 DB100 DB150

Maximum field of collectors m2 38 50 100 150

Tank capacity l 100 100 150 200

Manometric head of the pump m 25 30 25 30

Nominal flow rate l/h 1140 1500 3000 4500

Supply voltage V 1~230/50 Hz 1~230/50 Hz 1~230/50 Hz 1~230/50 Hz

System output kW 0,56 1,16 1,22 2,42

Maximum current A 4 3 3 3,3

Protection rating IP 20 20 20 20

Solar control box model Basic Premium Premium Premium

Domestic hot water loop (1) Yes Yes Yes

High-efficiency pack Yes Yes Yes

Energy meter Yes Yes Yes

(1) The domestic hot water loop consists of a heat exchanger and an accelerator pump for the domestic hot water loop.

10



3.3 Dimensions and connections

3.3.1 DB40S

Tab. 2 DB40S connections

Connection Size

1 Connection above the accumulator coil G1” M

2 System return (upper connection of solar panels) G1” M

3 System drain (used for commissioning) G1/2” M

4 Flow pipe to solar installation (lower connection of solar panels)

G1” M

5 Supply cable (included) -

6 Feedthroughs for temperature sensors -

7 Filling/draining the installation G1/2” M

8 Connection below the accumulator coil G1” M

1790

600 600 88

1

56

43

87

2300

406512

295512474 533 41,5

93

1731

11



3.3.2 DB50 and DB100

Tab. 3 DB50 and DB100 connections

Connection Size




G1” M




7 Domestic hot water outlet G1” M

8 Domestic hot water inlet G1” M

1790

600 600

45

32

876

1

300406

512

295

512406474 533 41,5

93

1731

12



3.3.3 DB150

Tab. 4 DB150 connections

Connection Size




G1” M




7 Domestic hot water outlet G1” M

8 Domestic hot water inlet G1” M

2174

600 600

45

32

876

1

300406

512

295

512406474 533 41,5

93

2115

13



3.4 Electrical diagram

3.4.1 DB40S

A Basic solar controlB Electrics boxC Solar pumpD Switch

3.4.2 DB50, DB100 and DB150

AB

D

2 4

1

A1

A2

3L

C

L

N

N

A1 A2

1 3 L N

4

2

R1 N L N L N

L

N

L N

230V,50Hz

1 (1) A 240 V~

LNR1

N

201918

1716151413121 2

IP 20

T2 A100 ... 240 V~

50-60 Hz

Temp . Sensor Pt1000S2S1 S3 S4 VBus

PWM

VFD

Made in GermanyDeltaSol® CS/2

3 4 5 6 7 8 9 10

A Premium solar controlB Frequency inverterC EMI filterD InductanceE Solar pumpF Energy meterG Domestic hot water loop accelerator pump

A B

C DE

F G

L N

U1 V1 W1

U1

K K1

U2

LN

L

R4

R4

PWMA AI1

COM

+24V

LI1

L

LN

N

U1U2

1-23-4

S6

N

R2

N

U /T1

V /T2

W /T3

230V,50Hz

R /L1

S /L2

8888 88 88

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

N N N N

R3 R2 R1 L 1 2 3 4 5 6 7 8 9

10 11

VBus

VBu

s

S5/V

40

S4S3

GN D

S6

S7

Sensor s

S2S1

100 ... 240 VT4 A

50-60 Hz

N

R3 R2 R1 L

R1-R3| 1 (1) A 240 V~R4 |1 (1) A 30 V

IP 20

R4

PWM

A0-

10 V

PWM

B0-

10 V

SD

R4

14

4 Product description


4 Description of the product

4.1 Description of the product

The Solar Drainback system is a compact unit providing protection against overheating. Conventional installations are prone to overheating which can shorten their service life and require intervention from maintenance engineers. With Drainback systems, solar installations with a large surface area are fully protected against this issue.Solar Drainback systems offer the following advantages:• Passive safety to protect against overheating. This means that the

solar system is protected under all circumstances, including in the event of a power supply fault.

• A wide range covering the vast majority of solar energy installations.• A manometric head of up to 35 m, depending on the model, which

covers the majority of building heights.• Guaranteed protection against overpressure as, on expansion, the

heat transfer fluid is absorbed by the air contained in the installation itself.

• Installation time is minimised as the system is supplied fully assembled and configured.

• Easy to use, the Drainback system needs no expansion vessels, air bleed valves, heat sinks (air heaters), 3-way valves or air separators.

• Reduced maintenance costs. The heat transfer fluid does not degrade, there are fewer components to check and the system constantly operates at low pressure: all these factors dramatically reduce preventive and corrective maintenance costs.

• Better adaptability to the uses of the installation. In buildings which have varying patterns of use, (e.g. schools, hotels, sports centres), the Drainback system is always available to meet the demand, while remaining in hibernation mode when it is not needed.

Premium units (DB50, DB100 and DB150) offer the following additional functions:• Energy meter used to measure energy savings.• Solar control box equipped with the VBus protocol enabling

connection to the building management software for remote monitoring of the operation of the installation.

• Heat exchanger for the built-in domestic hot water tank.• High-efficiency pack enabling the solar pump flow rate to be adapted

to the demand.

15



4.2 Operating principle

The operating principle is as follows:1 When idle, the solar panels remain empty, and the heat transfer fluid

is stored inside the Drainback unit.

2 When there is a demand and the sun is shining, the solar circuit pump starts up, transferring the heat transfer fluid to the panels.

3 Once the demand is satisfied, the pump stops and the heat transfer fluid returns to the Drainback unit owing to the effect of gravity. In this way, although there is still solar radiation, there is no vapour formed and the antifreeze is not degraded.

16



4.3 Main components

4.3.1 DB40S

1 Control box2 Safety valve3 Electrics box4 Pressure gauge5 Solar circuit pump6 Flow regulator7 Drainback vessel8 Drain valve

6

7

1

2

8

3

5

4

1

2

6

9

487

3

5

10

4.3.2 DB50, DB100 and DB150

1 Control box2 Safety valve3 Pressure gauge4 Solar circuit pump5 Flow regulator6 Frequency inverter7 Domestic hot water loop accelerator pump8 Energy meter9 Heat exchanger10 Drainback vessel

17



4.4 Standard delivery

Each Solar Drainback system package contains;• A Solar Drainback system• A pre-configured Basic or Premium solar control• Two PT1000 temperature sensors• Warranty card• An installation and maintenance manual• EC Declaration of conformity

18

5 Before installation



5.1 Installation regulations

CautionThe system must be installed by a qualified professional in accordance with prevailing local and national regulations.

5.2 Electrical requirementsTab. 5 Electrical data

Values

Supply voltage 1~230 V/50 Hz

Power supply Single phase

5.3 Design of the installation

5.3.1 Location dimensions

Decide on the ideal position for the installation, taking into account the legal provisions and the requirements in terms of space for the appliance. Allow sufficient space around the Drainback system to ensure adequate access to the appliance and enable any and all maintenance operations to be carried out.The dimensions shown in the figure should be used as a guideline.

1500

≥300

≥300

500

5.3.2 Accumulator location

The distance between the upper connection on the collectors and the accumulator must be between 2 and 25 m, depending on the model.

Related informationTechnical data, page 9.

Note(1) For greater heights, contact our technical department.

Hmin = 2mHmax = 35m(1)

19



5.3.3 Minimum incline

To ensure the correct operation of the Drainback system, the routing of the connection pipes between the solar collectors and the Solar Drainback system must not include any kind of siphon or rising gradient, as this would impede this system from draining.

CautionThe horizontal sections of piping must have a minimum incline of 3º to enable the installation to drain. However, greater inclines are recommended, where possible.

It is important not to oversize the connection pipes as this would produce excess fluid in the installation. Similarly, it is essential to check that the pipes do not create an excessive pressure drop as this would reduce the manometric capacity of the installation and could even impair its operation.

Related informationPipe diameter calculation, page 30.

In DB40S systems, the solar accumulator coil inlet must be below the Drainback vessel outlet, where possible. An air vent device must be fitted at the highest connection point. The air vent must be able to be isolated. After filling, the section A-B will be completely drained. Any air pockets remaining in this piping will affect the correct operation of the pump.

≥3%

A

B

A

B

5.3.4 Balancing valves

The balancing valves are used to regulate the flow circulating in each of the collector coils.For those installations where it is not possible to create an inverted return, it is recommended to use balancing valves to balance the flows circulating through each row of collectors.Where possible, it is recommended to design the rows of collectors minimising the number of collectors to ensure balance.

CautionThe flow rates on each row must be regulated to ensure a constant flow rate (15-60 l/h·m2) for each collector.

20



5.3.5 Installation examples

■ DB40S Drainback system and instantaneous combi boiler (residential building)

>3% >3%

SF1

SM

T

SM

T

1

3

2

54 7 8

9

1011

12

13

14

1516

6

1 Solar energy2 Temperature sensor on collectors3 DB40S Drainback system4 Shut-off valve5 Safety valve6 Vasoflex7 Retaining valve8 Pump9 On/off valve10 Draining the installation11 Domestic hot water accumulator12 Three-way thermostatic valve13 Instantaneous combi boiler14 Heating15 Domestic hot water16 Domestic cold water

21



■ DB40S Drainback system and condensing boiler for DHW and 1 direct heating circuit

ST

T KP

HP

TLP

TZP

>3% >3%

SF1

S

T

T

M

TTWF

SF4

M

M

SVFK

SRFK

SATF

T

1

2

3

4

5 6

7

9

8

10 11 1213

14

16 171518

19

20

21

22

23

1 Solar energy2 Temperature sensor on collectors3 DB40S Drainback system4 Shut-off valve5 Draining the installation6 Domestic hot water interaccumulator7 Safety valve8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Energy metering module15 Radiator flow pipe16 Domestic hot water17 Radiator return18 Domestic hot water recirculation pump19 Thermometer20 Three-way valve with domestic hot water recirculation21 Heating circuit 22 Pressure gauge23 Condensing boiler

22



■ DB40S Drainback system and instantaneous combi boiler with solar kit (residential building)

>3% >3%

SF1

MS

M

1

3

4

5

6

78

9

10

11

12

1314

2

1 Solar energy2 Temperature sensor on collectors3 DB40S Drainback system4 Shut-off valve5 Safety valve6 Pump7 Draining the installation8 Solar interaccumulator9 Vasoflex10 Solar kit11 Instantaneous combi boiler12 Heating13 Domestic hot water14 Domestic cold water

23



■ DB40S Drainback system and centralised boiler for DHW

>3% >3%

SF1

SF4

SATF

STWFTLP

M

T T

1

2

3

4

5

6

8

9 10 11 1213

14

17

18

19

20

15

16

7

1 Solar energy2 Temperature sensor on collectors3 DB40S Drainback system4 Shut-off valve5 Safety valve6 Draining the installation7 Solar interaccumulator8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Three-way valve with domestic hot water recirculation15 Domestic hot water recirculation pump16 Thermometer17 Pressure gauge18 Pump19 Three-way mixing valve20 Centralised boiler

24



■ DB40S Drainback system and condensing boiler for DHW and 1 direct heating circuit (tertiary sector)

>3% >3%

SF1

SF4

SATF

S2

TLPM

T T

HPM

TSF4

1

2

3

4

6

5

78

9 10 11 1213

14

15

16

17

1819

2021

22

2324

1 Solar energy2 Temperature sensor on collectors3 DB40S Drainback system4 Shut-off valve5 Safety valve6 Draining the installation7 Solar interaccumulator8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Accelerator pump15 Thermometer16 Domestic hot water17 Four-way valve18 Domestic cold water19 Domestic hot water backup accumulator20 Pump21 Pressure gauge22 Heating circuit23 Condensing boiler

25



■ DB50/100/150 Drainback system and instantaneous combi boiler (residential building)

>3% >3%

SF1

SM

T

SM

T

1

3

2

4 6 7

8

910

11

12

13

1415

5

1 Solar energy2 Temperature sensor on collectors3 DB50/DB100/DB150 Drainback system4 Safety valve5 Vasoflex6 Retaining valve7 Pump8 On/off valve9 Draining the installation10 Domestic hot water accumulator11 Three-way thermostatic valve12 Instantaneous combi boiler13 Heating14 Domestic hot water15 Domestic cold water

26



■ DB50/100/150 Drainback system and condensing boiler for DHW and 1 direct heating circuit

ST

T KP

HP

TLP

TZP

>3% >3%

SF1

S

T

T

M

TTWF

SF4

M

M

SVFK

SRFK

SATF

T

1

2

3

4

5 6

7

9

8

10 11 12

14

16 171518

19

20

21

22

23

1 Solar energy2 Temperature sensor on collectors3 DB50/DB100/DB150 Drainback system4 Shut-off valve5 Draining the installation6 Domestic hot water interaccumulator7 Safety valve8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Energy metering module15 Radiator flow pipe16 Domestic hot water17 Radiator return18 Domestic hot water recirculation pump19 Thermometer20 Three-way valve with domestic hot water recirculation21 Heating circuit 22 Pressure gauge23 Condensing boiler

27



■ DB50/100/150 Drainback system and instantaneous combi boiler with solar kit (residential building)

>3% >3%

SF1

M

S

M

1

3

4

5

6

78

9

10

11

12

1314

2

1 Solar energy2 Temperature sensor on collectors3 DB50/DB100/DB150 Drainback system4 Shut-off valve5 Safety valve6 Pump7 Draining the installation8 Solar interaccumulator9 Vasoflex10 Solar kit11 Instantaneous combi boiler12 Heating13 Domestic hot water14 Domestic cold water

28



■ DB50/100/150 Drainback system and centralised boiler for DHW

>3% >3%

SF1

SF4

SATF

STWFTLP

M

T T

1

2

3

4

5

6

8

9 10 11 1213

14

17

18

19

20

15

16

7

1 Solar energy2 Temperature sensor on collectors3 DB50/DB100/DB150 Drainback system4 Shut-off valve5 Safety valve6 Draining the installation7 Solar interaccumulator8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Three-way valve with domestic hot water recirculation15 Domestic hot water recirculation pump16 Thermometer17 Pressure gauge18 Pump19 Three-way mixing valve20 Centralised boiler

29



■ DB 50/100/150 Drainback system and condensing boiler for DHW and 1 direct heating circuit (tertiary sector)

>3% >3%

SF1

SF4

SATF

S2

TLPM

T T

HPM

TSF4

1

2

3

4

6

5

78

9 10 11 1213

14

15

16

17

1819

2021

22

2324

1 Solar energy2 Temperature sensor on collectors3 DB50/DB100/DB150 Drainback system4 Shut-off valve5 Safety valve6 Draining the installation7 Solar interaccumulator8 Vasoflex9 Retaining valve10 Counter11 Screen filter12 Mains power supply13 Domestic cold water14 Accelerator pump15 Thermometer16 Domestic hot water17 Four-way valve18 Domestic cold water19 Domestic hot water backup accumulator20 Pump21 Pressure gauge22 Heating circuit23 Condensing boiler

30



5.3.6 Pipe diameter calculation

To size the piping, it is recommended that the linear pressure drop of the pipes does not exceed 40 mmH2O/m and the maximum speed does not exceed 2 m/s (the design flow rate taken into account is 30 l/h·m2).

Tab. 6 Diameter of piping with a 30% glycol concentration at 40 ºC

Flow (l/h)Recommended diameter Large diameter

Nominal diameter v (m/s) ΔP(mmH2O/m) Nominal

diameter v (m/s) ΔP(mmH2O/m)

500 Ø22x1.0 0.44 18.4 Ø28x1.5 0.28 6.4

1000 Ø28x1.5 0.57 21.2 Ø35x1.5 0.35 6.6

1500 Ø28x1.5 0.85 42.9 Ø35x1.5 0.52 13.3

2000 Ø35x1.5 0.69 22.0 Ø42x1.5 0.47 8.6

2500 Ø35x1.5 0.86 32.4 Ø42x1.5 0.58 12.7

3000 Ø35x1.5 1.04 44.7 Ø42x1.5 0.70 17.4

3500 Ø42x1.5 0.82 22.8 Ø54x2.0 0.49 7.1

4000 Ø42x1.5 0.93 28.9 Ø54x2.0 0.57 8.9

4500 Ø42x1.5 1.05 36.2 Ø54x2.0 0.63 11.1

5.3.7 Checking the volume

Tab. 7 Tank volumes

DB40S DB50 DB100 DB150

Tank volume 100 L 100 L 150 L 200 L

Tab. 9 Installation volumes

Number of SOL250 collectors

Solar capture surface area (m2)

Collectorfieldvolume (L) Max.flow(l/h) Recommended internal

diameter (mm)Volume per linear metre (L/m)

8 20 18.4 1500 25 0.49

10 25.0 23.0 1500 25 0.49

15 37.5 34.5 1500 25 0.49

20 50.0 46.0 1500 25 0.49

25 62.5 57.5 3000 32 0.80

30 75.0 69.0 3000 32 0.80

35 87.5 80.5 3000 32 0.80

40 100.0 92.0 3000 32 0.80

45 112.5 103.5 4500 39 1.19

50 125.0 115.0 4500 39 1.19

55 137.5 126.5 4500 39 1.19

60 150.0 138.0 4500 39 1.19

CautionWe must ensure that the theoretical volume of the installation is less than the storage volume of the tank to guarantee that the unit can store the entire volume of the installation. If the volume of the installation is greater than the volume of the tank, the installation's drainpipes will have to be used to store the excess fluid.

31



■ Installation example

We have an installation with 35 SOL250 solar collectors, i.e. the total solar capture surface area is 87.5 m2 and the collector field volume is 80.5 L.Solar capture surface area:Scap = 35 x 2.5 m2 = 87.5 m2

Collectorfieldvolume:Vcap=35 x 2.3 L = 80.5 L

If the total height is 20 m, with a horizontal distribution section measuring 50 m, in total, there will be 90 m of pipework with an interior diameter of 32 mm. This length of piping corresponds to a total volume of 72 L.Pipework volume:LP=20+20+50=90 m pipingVP=90 m·0.8 L/m=72 L

These 72 L are added to the 80.5 L from the collector field, to obtain a theoretical volume of 152.5 L in total for the installation.Total theoretical volume:VT=Vcap+VP=72 L+80.5 L=152.5 L

Taking a 20% safety margin, the total required volume of the Drainback to store the entire volume necessary for the installation is 183 LVolume of Drainback unit:VDB=VT·1.2=152.5 L·1.2=183 L

In this case, a DB150 system with a tank with a capacity of 200 L must be used, this ensures that the total volume of fluid in the installation is stored inside the tank of the DB150 system.

5.3.8 Quantity of antifreeze

BAXI heat transfer fluid can be used to fill the installation, in the correct concentration for the minimum foreseeable outdoor temperature in the location. If it can be guaranteed that the fluid in the installation will always be stored in the tank, the glycol concentration can be reduced; otherwise, it is recommended to use a mix of water and glycol in the following proportions:

Tab. 8 Concentration of heat transfer fluid

Volume of heat transfer fluid 26% 33% 37%

Minimum outdoor temperature -10 ºC -15 ºC -20 ºC

CautionUnder no circumstances should the mixture of water and glycol exceed 40%.

WarningAlthough it is non-toxic, odourless and biodegradable, it is appropriate to take precautions when handling the product. You are recommended to use gloves which are resistant to chemical products and to wear suitable eye protection when handling the product.

WarningIf the fluid comes into contact with your skin, wash it with soap and water. If it comes into contact with your eyes, wash them immediately with plenty of clean running water.

32

6 Installation


6 Installation

6.1 General

The following observations must be taken into account for a Solar Drainback installation:• Once all the hydraulic connections have been completed, check the

sealing of the entire circuit.• It is helpful to protect the collectors from the potential effects of

solar radiation once the packaging has been removed, until the installation has been filled.

• If there is no demand, or it is anticipated that there will be long periods without any DHW being extracted, it is recommended to protect the system using thermal blankets.

• Once all the connections on the solar control box sensors have been completed, it is important to check that these do not run across other electrical cables as this could generate interference and alter the readout values.

• It is recommended to use a shielded cable for the sensor connections.

6.2 Hydraulic diagram

6.2.1 DB40S

1 Flow pipe to the solar installation2 Return from the solar installation3 System drain4 Upper coil connection5 Drain valve6 Lower coil connection7 Filling branch pipe

1

DB40

23

4

67

5

33

6 Installation


6.2.2 DB50, DB100 and DB150

1 Flow pipe to the solar installation2 Return from the solar installation3 System drain4 Solar circuit heat exchanger input5 Solar circuit heat exchanger output6 Filling branch pipe7 Domestic hot water inlet8 Domestic hot water outlet

Tout

12

3

85

6

74

DB50, DB100 y DB150

6.3 System connection

WarningCarry out the electrical connections on the appliance according to the requirements of current standards, the information given in the wiring diagrams provided with the appliance and the recommendations in this instruction manual. Only qualified professionals may carry out electrical connections, always with the power off.

Earth the appliance before making any electrical connections.Disconnect the mains supply before carrying out any work on the appliance and the accessories connected to the appliance.The Drainback system is supplied fully prewired. Do not modify the connections inside the control unit.The electrical power supply is obtained via the connection cable prewired in the appliance.

WarningIf the power cable is damaged, for safety reasons this must only be replaced by the manufacturer, by its After-Sales department or by qualified personnel.

34

6 Installation


The appliance must be powered with a circuit equipped with a multipole switch with a contact opening distance of 3 mm.Earthing must comply with the prevailing installation standards.

CautionSeparate the sensor cables from the 230 V circuit cables.The installation must be fitted with a main switch.

All the connections are made on the terminal blocks supplied for this in the Drainback system connection box.

NoteFailure to observe these rules may result in interference and malfunctioning of the controller, and even damage to the electronic circuits.

6.4 Filling the installation

6.4.1 General

CautionDuring the start-up process, pay particular attention to cover the collectors, in order to avoid an undesirable increase in pressure.

CautionThe installation must be filled with the system empty.

6.4.2 Checksbeforefilling

Before filling the installation, check the sealing of the entire circuit to ensure that there are no leaks in the system:1 Pressurise the installation with water.2 Check the sealing of the installation.3 Configure solar control relay 1 in manual mode and set it to 100%.

Related informationSolar control, page 37

4 Regulate the total flow rate.5 Balance the rows.

Related informationBalancing valves, page 19

6 Switch off the pump.7 Drain the installation

35

6 Installation


BA C D

E F

6.4.3 DB40S

Close all the valves before filling the installation:

NoteThe installation must be filled using mechanical or electrical filling equipment.

1 Calculate the amount of antifreeze fluid required for the installation.

Related informationQuantity of antifreeze, page 31.

2 Mix the amount of antifreeze fluid required with tap water.3 Connect the outlet of the filling unit to the filling valve on the

installation (E).4 Open the filling valve on the installation (E).5 Fill until the filling station pressure is reached (the solar accumulator

coil will be full).6 Open the upper connection valve to the accumulator coil (A). The

Drainback tank will begin to fill.7 Open the system's drain valve (C) until fluid flows out.8 Close the filling valve on the installation (E).9 Close the system's drain valve (C).

NoteThe order of steps 8 and 9 is important to avoid over-pressurising the system.

6.4.4 DB50, DB100 and DB150

Close all the valves before filling the installation.

NoteThe installation must be filled using mechanical or electrical filling equipment.

1 Calculate the amount of antifreeze fluid required for the installation.

Related informationQuantity of antifreeze, page 31.

2 Mix the amount of antifreeze fluid required with tap water.3 Connect the outlet of the filling unit to the filling valve on the

installation (D).4 Open the filling valve on the installation (D).5 Open the system's drain valve (B).6 Fill the system until the heat transfer fluid flows out of the drain valve (B).7 Close the filling valve on the installation (D).8 Close the system's drain valve (B).

NoteThe order of steps 6 and 7 is important to avoid over-pressurising the system.

A B C

D E F

36

6 Installation


6.4.5 Checksafterfilling

If the theoretical volume of the installation is less than the capacity of the tank, proceed to start up the system.

Related informationChecking the volume, page 30.

If the theoretical volume of the installation is greater than the capacity of the tank, contact the technical department.Once the installation has been filled:1 Configure solar control relay 1 in manual mode and set it to 100%.

Related informationSolar control, page 37.

2 Check that the collector field fills correctly.3 Switch off the pump.4 Check that the installation has drained correctly.

WarningHandle with care: risk of high temperatures!

5 Configure solar control relay 1 in automatic mode.

Related informationSolar control, page 37.

WarningBefore configuring the control in automatic mode, ensure that the installation is full and ready to use, to avoid heating the Drainback vessel when empty.

37

7 Solar control


7 Solar control

7.1 Description of the Basic solar control

7.1.1 Keys

The controller is operated using the 3 keys under the screen:1 Forwards (+)2 Back (-)3 SET (selection/adjustment mode)Key 1 is used to move forwards in the menu or to increase values. Key 2 is used to move backwards in the menu or to reduce values. Key 3 is used to select channels and confirm settings.During normal operation, the screen only shows the display channels.To switch between channels, press keys 1 and 2.To access the setting channels, press key 1 until you reach the last display channel; then press and hold key 1 for approximately 2 seconds. When the screen shows a setting channel, the "SET" symbol will appear on the right-hand side.To select a setting channel, press key 3. "SET" begins to flash. Set the desired value using keys 1 and 2. Briefly press key 3. "SET" will appear permanently, the value set is stored in the memory.

7.1.2 System monitoring screen

The system monitoring screen comprises 3 parts:• Parameter indicator• Symbol bar• System diagram

7.1.3 Channel indicator

The channel indicator has two lines. The top line has 16 segments and mainly indicates the names of the parameters and submenus. The bottom line also has 16 segments and indicates values and parameters.

7.1.4 Symbol bar

The symbols in the symbol bar indicate the status.

Tab. 9 Meaning of symbols

Symbol permanently lit Flashing Operating status indication

Relay 1 active

The temperature of the accumulator has exceeded the maximum value

+ Accumulator safety disconnection activated

Collector safety disconnection activated

Collector cooling on

System cooling on

+ Accumulator cooling on

1

3

2

SET

ºCºK

SET

ºCºK

SET

ºCºK

38

7 Solar control


Tab. 9 Meaning of symbols

Symbol permanently lit Flashing Operating status indication

Accumulator cooling on standby with holiday mode enabled

+ Accumulator cooling on standby with holiday mode on

Minimum threshold collector on

Frost protection function enabled

Frost protection function on

+ Manual mode relay 1 ON

Manual mode relay 1 OFF

Sensor fault

7.1.5 System diagram

The system monitoring screen shows the selected system diagram. This includes various symbols which represent the system components. Depending on the operating status of the system, these symbols may be permanently lit, flashing or may not appear at all.

Tab. 10 Meaning of symbols in the system diagram

Symbol permanently lit Operating status indication

Collector with sensor

Pump

Temperature sensor

Accumulator with heat exchanger

• The pump symbol flashes when the corresponding relay is activated.• The sensor symbols flash once the corresponding display channels

are selected.• The sensor symbols flash quickly to indicate a fault on the

corresponding sensors.

7.2 Description of the Premium solar control

7.2.1 Keys and dial

The controller is operated using the 2 keys and the dial below the screen:1 Go back to previous menu2 Confirm/select3 Move up/down, increase/reduce values4 Manual mode5 Holiday modeBriefly press the manual mode key to access the manual mode menu.Holiday mode is accessed using the corresponding key. Press and hold this key for approximately 3 seconds to display the Holiday days parameter to enter the number of days' absence. When a value over 0 is entered, the mode set in the Holiday mode menu will be enabled and a countdown of the remaining days will be shown from 00:00. If this value is set to 0, the mode will be disabled.

SET

ºCºK

1

3

2

4

5

39

7 Solar control


Control indicatorThe control features a control indicator with various colours in the centre of the dial. This indicates the following operating statuses:

Tab. 11 Premium solar control box operating statuses

Colour Permanently lit Flashing

Green All correct Manual mode: one relay at least in manual mode

Red Broken sensor cable, short-circuit on the cable of one sensor, monitor flow rate, overpressure, low pressure

Yellow Holiday mode ON Temperature difference too high, night-time circulation, SUPP/RET reversed, maximum temperature exceeded, updating, MicroSD card write error

40

8 Frequency inverter



8.1 General

If the inverter has not been connected to the power supply for a prolonged period of time, the condensers must be restored to full power before the pump is started up.Power the inverter for one hour before starting up motor if the inverter has not been connected to the power supply for the following periods of time:• 12 months at a maximum storage temperature of 50 ºC• 24 months at a maximum storage temperature of 45 ºC• 36 months at a maximum storage temperature of 40 ºCEnsure that no start command can be run before an hour has elapsed.Check the date of manufacture if the inverter is being started up for the first time; if the date of manufacture is over 12 months, carry out the specific procedure.

CautionFailure to follow these instructions may damage the unit.

8.2 Description of the frequency inverter

8.2.1 Functions of the screen and keys

1 The ESC key is used to navigate through the menu (go back) and to set parameters (cancel).

2 The dial selector is used to navigate through the menu (up or down) and to set parameters (increase/decrease a value or an accessory option).

3 The ENT key (press the dial selector) is used to navigate through the menu (go forwards) and to set parameters (confirm).

4 REF mode selected (R e f - ).5 MON mode selected (M o n - ).6 CONF mode selected (C o n F ).7 Point used to show the parameter value (hundredths).8 Point used to show the parameter value (tens).9 The current display is the parameter value.10 The current display is the parameter unit.

88 8 8

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

56

1

4

3

7

10

8

2

9

41



8.3 Auto adjustmentNoteIt is recommended to perform an auto adjustment procedure on the frequency inverter before starting up the unit.

1 To access the auto adjustment function, select the configuration (C o n F ) menu using the dial and confirm by pressing the ENT key.

8o8C 8n 8F

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8u8F lL 8L

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8i8S ln 8-

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8t8 lu 8n

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

2 Select the FULL (F u L L ) submenu and confirm.

3 Select the Quick Start submenu (S i n - ) and confirm.

4 Select the Auto adjustment function (t u n ) and confirm.

5 Select the desired action and confirm.

Tab. 12 Auto adjustment function actions

Code Name Description

n o No action Auto adjustment not in progress.

Y E S Proceed with adjustment

Auto adjustment will proceed immediately if possible and the parameter will then change automatically to [No action] (n o ).If the inverter status does not enable an auto adjustment procedure to be performed immediately, the parameter changes to [No] (n o ) and the procedure must be repeated.

C L r Clear adjustment The motor parameters measured by the auto adjustment function are reset. The motor is controlled using the preset motor parameter values. [Auto adjustment status] (t u S ) set to [Not performed] (t A b ).

42



DangerAuto adjustment moves the pump to adjust the control loops.

During auto adjustment, the motor makes small movements: it is normal to hear the system make noises and oscillations. Auto adjustment should last for 1 to 2 seconds. Do not interrupt the process. Wait until the No Action (no) command appears on the screen.

NoteThe temperature of the motor may have a considerable effect on the result of the adjustment. Perform the adjustment procedure when the motor is off and cold.

To repeat the adjustment procedure, wait until the motor has switched off and cooled completely. First, set the Auto adjustment function (t u n ) to Clear Settings (C L r ) and then repeat the adjustment procedure (Y E S ).

8.4 Automatic mode

1 To access the automatic mode, select the configuration (C o n F ) menu using the dial and confirm by pressing the ENT key.

8o8C 8n 8F

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8u8F lL 8L

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8t8C 8L 8

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

8H8C 8C 8F

ESC

RefValue

CAN Run CAN Err

UnitMon

Conf

2 Select the FULL (F u L L ) submenu and confirm.

3 Select the CTL (C t L ) submenu and confirm.

4 Select the CHCF (C H C F ) submenu and confirm.

5 Select SiN (S i N ) and confirm.

43

9 Commissioning


9 Commissioning

9.1 General

The Drainback system is commissioned to enable it to be used for the first time after it has been out of service for a prolonged period or after any circumstance requiring a full reinstallation of the system.Commissioning the system enables the user to check the various settings and perform the necessary checks to start up the system in complete safety.

9.2 Checklist before commissioning

1 Check that the installation and the system are filled with water and have been bled correctly.

2 Check the tightness of the pipe connections.3 Bleed the system if necessary.4 Check the pressure shown on the primary loop pressure gauge. 5 Check the electrical connections.6 Check that there is an earth connection and the corresponding earth

connection circuit.

9.3 DB40S commissioning procedure

9.3.1 Procedure

Once the filling procedure is complete, the Drainback system must be connected to the power supply. Although the system is configured in the factory, if the control is reset, the first time that the control is switched on, the initialisation phase begins and the commissioning menu launches automatically.The commissioning menu guides the user through the key adjustment parameters required to operate the system.

■ Language

Select the language required.

■ Unit of temperature

Select the unit of temperature.

■ Maximum temperature of the accumulator

Adjust the desired maximum temperature of the accumulator.

NoteThe control includes a function to disconnect for safety reasons (which is not adjustable); this function disables the system when the temperature of the accumulator reaches 95 ºC.

ESIDIO SET

oCUNID SET

90A MX

oCSET

44

9 Commissioning


■ Pump control

Adjust the control mode of the pump without speed control, On/Off mode.

■ Minimum speed

Adjust the minimum speed of the pump (corresponding to 100%).

■ Maximum speed

Adjust the maximum speed of the pump (corresponding to 100%).

■ Finalising settings in the commissioning menu

After accessing the last channel in the commissioning menu, a safety request is displayed to confirm the settings made. To confirm the settings made, press the central key.

NoteAll the settings made during commissioning can be changed later if necessary, via the corresponding parameter. Additional functions and options can also be enabled and adjusted.

9.3.2 Basic factory setting values

Tab. 13 Basic solar control factory settings

Language ES

Unit of temperature ºC

R1 pump control On/Off

R1 minimum speed 100%

R1 maximum speed 100%

Maximum temperature of the accumulator 85 ºC

Collector safety temperature when OBD is enabled

120 ºC

Drainback option ON

OBD connection condition - period 60 s

OBD filling time 5.0 min

OBD stabilisation time 3.0 min

9.4 Commissioning procedure for the DB50, DB100 and DB150

9.4.1 Procedure

Once the filling procedure is complete, the Drainback system must be connected to the power supply. Although the system is configured in the factory, if the control is reset, the first time that the control is switched on, the initialisation phase begins (during which the central key flashes red) and the commissioning menu launches automatically.

OnOffBOM SET

100nMN SET

100nMX SET

OK SET

45

9 Commissioning


The commissioning menu guides the user through the key adjustment parameters required to operate the system.The commissioning menu comprises the parameters described below. To make an adjustment, set the desired value using the central dial and press the right-hand key to confirm. The following parameter will appear on the screen.

■ Language

Select the language required.

■ Units

Select the unit of temperature.

Select the flow rate unit.

Select the unit of pressure.

Select the unit of energy.

■ Switching between summer and winter time

Enable or disable automatic switching between summer and winter time.

■ Time

Set the clock. Set the hours first, then the minutes.

■ Date

Set today's date. Set today's date by setting the year first, then the month and the day.

■ Select: system or diagram

Select to configure the controller with a system.

Unidad temp.o Fo C

Unidad caudalGalonesLitros

Unidad presion-

psibar

Unidad energia-

MBTUkWh

Verano/inviernoSiNo

Hora

16:25

IdiomaEnglishFrancaisSpanish

Fecha

??.??.2017

Sistema o esquemaEsquemaSistema

46

9 Commissioning


Select solar system 1. This solar system has the following configuration of sensors and relays:

Tab. 14 Sensors and relays in solar system 1

Sensors Relays; PWM/0-10 V

Collector 1 S1 Solar pump R1; PWMA

Lower accumulator S2 - -

■ Finalising settings in the commissioning menu

After selecting the system or entering the diagram number, a safety request is displayed. If the request is confirmed, the settings will be saved.To confirm the safety request, press the right-hand key.To go back into the commissioning menu, press the left-hand key. After confirming the safety request, the solar control is ready to use and the system should operate optimally with the factory settings.

NoteAll the settings made during commissioning can be changed later if necessary, via the corresponding parameter. Additional functions and options can also be enabled and adjusted.

9.4.2 Premium factory setting values

■ Solar

Tab. 15 Solar menu factory values

Basic settings

System 1

Collector

Collector min. temp. 10 ºC

Coll. safety temp. 130 ºC

Accumulator

ΔTon 6.0 K

ΔToff 4.0 K

ΔTnom 10.0 K

Ac. nom. temp. 90 ºC

Ac. max. temp. 90 ºC

Acc. Hys. 2.0 K

Increase 2.0 K

tmin 30 s

Minimum speed 40%

Accumulator On

Optional functions

Outdoor heat exchanger

Relay R2

Minimum speed 100%

Accumulator 1

Heat exchange sensor S3

Target temperature Off

ΔTon 6.0 K

Sistema

Guardar? SiEsquema

Guardar? Si

Sistema

1

47

9 Commissioning


Tab. 15 Solar menu factory values

ΔToff 2.0 K

Extend 2.0 min

Function On

Cooling mode

Variant Collector

Collector maximum temperature 110 ºC

Accumulator 1 1

Accumulated cooling Off

Function On

Drainback

Filling time 2.0 min

Stabilisation 1.0 min

Initialisation 60 s

Booster Off

Draining implosion Off

Function On

■ Installation

Tab. 16 Installation menu factory values

Optional functions

Parallel relay

Relay R4

Reference relay R1

Extend Off

Delay Off

Speed Off

Invert Off

Function On

■ Energy meter

Tab. 17 Heating menu factory values

Energy meter

Supply sensor S3

Return sensor S6

Flow rate sensor On

Flow rate sensor S6

Fluid type Water

Function On

■ Inputs/Outputs

Tab. 19 Inputs/outputs menu factory values

Inputs

S1 PT1000

S2 PT1000

S3 PT1000

S4 PT1000

S5 N/A

48

9 Commissioning


Tab. 19 Inputs/outputs menu factory values

S6 Type VFS

Min 5 l/min

Max 100 l/min

S7 N/A

Outputs

R1 Signal 0-10 V

Output A

Type Solar

Min. speed 40%

Max. speed 100%

R2 Signal Standard

Min. speed 100%

Max. speed 100%

R3 Free

R4 Signal Standard

Tab. 20 Configured inputs/outputs

Solar

Collector S1

Lower accum. S2

Primary pump R1

Parallel relay R4

Heat exchange

Heat exchanger heat source S3

Heat exchanger consumption S2

Secondary pump R2

Energy meter

Energy meter supply S3

Energy meter return S6

Energy meter flow rate S6

49

10 Maintenance


10 Maintenance

10.1 General

CautionMaintenance work must be carried out by a qualified professional.

CautionFailure to service the system will void the warranty.

CautionUse only genuine spare parts.

DangerDepending on the fluid temperature and the system pressure, if the vent screw is completely loosened hot liquid or gas can escape or even shoot out at high pressure. Beware of scaling.

DangerDepending on the operating conditions of the pump or installation (fluid temperature), the entire pump may be come very hot. Avoid touching the pipe owing to the risk of burning.

10.2 Standard servicing and maintenance operations

Have a service carried out at least once a year, or more often, depending on the regulations in force in your country:1 Check for leaks in the system.2 Check the hydraulic pressure.3 Check the fluid drained via the safety valve and fill the installation if

necessary.4 Check the status of the components.5 Check the maximum flow rate of the pump.6 Check the electrical connections.7 Check that the collectors are not too dusty. The collectors can be

cleaned with water, but they must be cold to avoid breaking the crystal.

8 Check if the collector installation shows any signs of damage or if there is any accumulated waste.

9 Check if the collector shows any signs of corrosion.10 Check if there is any damage or leaks in the accessories and

pipework, and check the condition of the insulation on these components.

50

11 Troubleshooting


11 Troubleshooting

11.1 General malfunctions

Danger of electrocutionAlways disconnect the unit from the power supply before removing the cover from the solar control.

Tab. 21 Resolving general problems

Fault Possible cause Solution

The collector field installation does not heat the accumulator water

The surface of the collectors is dirty. Clean the surface of the solar collectors.

The surrounding flow rate is insufficient.

Check the surrounding flow rate and, if necessary, adjust it to the correct value using the flow regulator.

Incorrect sensor reading. Check that the sensors are correctly positioned. If faulty, replace.

Solar control malfunction. Check the parameter configuration of the control. If in doubt, contact the technical department.

No fluid circulating in the installation.

The installation has not been correctly sized.

The installation's pipe network does not meet the criteria in terms of the required dimensions and arrangement, therefore the fluid cannot circulate.

System electrical fault. Check the electrical supply at various points in the system.

The height of the installation exceeds the manometric head of the pump.

Check the reading on the pressure gauge and the flow regulator when the pump is running.

Air found in the pump intake.Bleed the entire system. Repeat the installation filling process if necessary.

Flow rate too high. Adjust the flow rate to the desired value using the flow regulator.

The solar pump does not run.

The pump is blocked. Disassemble the pump and check that there is no obstruction. If the error persists, contact the technical department.

The solar pump is not powered. Check the pump connections. Check the electrical supply to connection R1.

The solar control is incorrectly configured. Check the configuration of the solar control.

The pump starts and stops intermittently.

The temperature difference in the control is too small. Change the ΔTon and ΔTon settings to the correct values.

Collector sensor fitted in the wrong place. Position the temperature sensor at the hottest output of the collector.

The pump starts running after a long delay.

ΔTon connection temperature difference too great. Change the ΔTon and ΔTon settings to the correct values.

Collector sensor incorrectly positioned.

When the sun is shining, briefly adjust the solar pump in manual mode, and check if the temperature of the collectors increases.

The accumulator cools down overnight.

The solar circuit pump works overnight.

Check the operating status of the pump.

Check the configuration of the solar control.

The solar pump does not run although the temperature of the collectors is greater than the temperature of the accumulator.

The temperature difference in the control is too great. Change the ΔTon and ΔTon settings to the correct values.

The solar control is incorrectly configured.

Check the configuration of the solar control.

Check the position of the sensors.

The fluid does not drain out of the installation correctly.

The installation has not been correctly designed. The minimum gradients for drainage have not been respected.

The installation's pipe network does not meet the criteria in terms of the required dimensions and arrangement, therefore the fluid cannot drain. Make sure that there are no siphons in the installation.

51

11 Troubleshooting


11.2 DB40S malfunctions

Danger of electrocutionAlways disconnect the unit from the power supply before removing the cover from the solar control.

Tab. 22 Resolving DB40S problems


symbol lit + symbol flashingBroken cable. Check the cable and replace it.

Short circuit. Check the cable and replace it.

Screen off. Power supply fault. Check the power supply to the unit. Replace the damaged cable.

11.3 DB50, DB100 and DB150 malfunctions

Danger of electrocutionAlways disconnect the unit from the power supply before removing the cover from the solar control box.

Tab. 23 Resolving DB50, DB100 and DB150 problems


The solar control flashes red.Sensor fault. Check the sensor and replace it.

Broken cable or short circuit. Check the cable and replace it.

Screen off. Power supply fault. Check the power supply to the unit. Replace the damaged cable.

The temperature difference between the accumulator and the collector increases significantly when the system is on.

There is scale in the heat exchanger. Clean the component and remove any scale. If it is broken, replace it.

The heat exchanger is blocked. Clean the heat exchanger. If it is broken, replace it.

Tab. 24 Resolving Premium solar control problems

Error code Display Monitoring function Reason

0001 Sensor error! Broken cable Broken sensor cable

0002 Sensor error! Sensor cable short circuit Short circuit on the sensor cable

0011 ΔT too high! ΔT too high Tcoll. 50 K > Tacc loaded

0021 Night-time circulation! Night-time circulation Between 23:00 and 05:00 Tcoll. > 40 ºC

0031 SUPP/RET reversed! Supply/return reversed Collector temp. does not increase after activation

0041 Monit. flow rate! Monitor flow rate Flow rate not detected by the sensor

0051 Overpressure! Monitor overpressure Flow rate not detected by the sensor

0052 Low pressure! Monitor low pressure The system pressure is below the minimum threshold value

0061 Memory fault! Settings cannot be changed or saved -

0071 Timer fault! Timer functions not available (e.g. night-time correction) -

0081 Acc. max. temp.! Maximum accumulator temperature The maximum accumulator temperature has been exceeded

0091 Reset Reset counter (not adjustable) Number of resets since start-up

52

12 Decommissioning


12 Decommissioning

12.1 Decommissioning procedure

If the Drainback system must be decommissioned, either temporarily or permanently, proceed as follows:1 Switch off the power supply to the system.2 Wait until the fluid has drained out of the installation and is stored in

the Drainback system.3 Close all the valves on the system.

NoteThe installation fluid will remain stored in the system.

12.2 Recommissioning procedure

WarningOnly qualified professionals are authorised to work on the Drainback system and the installation.

To recommission the Drainback system, proceed as follows:1 Reconnect the system to the power supply.2 Check the level of fluid stored in the system.

NoteIf this system is not completely full, fill the installation.

Related informationFilling the installation, page 34.

3 Commission the system.

Related informationCommissioning, page 43.

53

13 Disposal


13 Disposal

13.1 Disposal and recycling

WarningRemoval and disposal of the Drainback system must be carried out by a qualified installer in accordance with local and national regulations.

Disassemble the system as follows:1 Switch off the power supply to the system.2 Wait until the fluid has drained out of the installation and is stored in

the Drainback system.3 Close all the valves on the system.4 Drain the Drainback system via the valve used for filling/draining.

WarningHandle with care: the fluid inside can be very hot.

NoteThe fluid inside is a mix of glycol and water; do not pour it down the drain – recycle it appropriately.

5 Disconnect all the inlets and outlets on the system.6 Recycle or dispose of the system.

54

12 Decommissioning


© CopyrightWe hold the property rights to all the technical and technological information contained in these instructions, along with the technical descriptions and diagrams provided. These cannot be reproduced without our prior written consent. Content subject to amendment.

7662865-07

EN7662865 - v07 - 20102017

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