STIEBEL ELTRON SOL 27 basic Operation Instruction

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0<A:<-09A0</0949,<,9>40@0<><,26:88>94.3>C?=>,9/0

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40,<,9>40704=>?92A4</0<-<,.3>A099,9?9=0<090<F>09049

0<=>077?92=?9/:/0<",>0<4,710370<4990<3,7-/0<,<,9>40

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=:7.300<F>0,9/09090370<&.3F/09:/0<"F9207,?12<?9/

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&:A04>0490,<,9>40704=>?920<-<,.3>A4</H-0<903809A4<

60490,1>?921H</400=.3F/42?920490=0<F>0=/?<.340-

=>,370?0<?1<?3<:/0<F3974.30(<=,.309

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09>=>,9/090<&.3F/09207>09/8,.3090=0>C74.309=;<H.30

/0= ?9/09?9=20209H-0<:/0<20209H-0<<4>>09-704-09?9

-0<H3<>

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0<F>0490A0<-0,9/A0<6=:/0<9/?=><40-0><40-09-0><F2>

/40,<,9>40/,?0<":9,>0

40,<,9>40/,?0<-02499>1H<50/0=0<F>84>/0<E-0<2,-0/0=

0<F>0=,9/09 ?9/09/0</,=0<F>C?80<=>09",7049=0>C>

,<,9>40704=>?92091H3<0994.3>C?0490<)0<7F920<?92/0<,<,9

>40/,?0<?<.3/400<-<,.3>0,<,9>40704=>?92A4</6049090?0

,<,9>40/,?0<49,9220=0>C>40=247>1H<,7700<-<,.3>09,

<,9>40704=>?920949=-0=:9/0<01H<0>A,4204920-,?>0<=,>C>0470

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9,.3A04=4=>/40%0.39?92:/0<049=:9=>420</,>40<>0< ,?19,.3

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7,209-0=>03>6049,<,9>40,9=;<?.3

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 

*4<=49/ 94.3>@0<;4.3>0>,<,9>40704=>?9209,?D0<3,7-/0<

?9/0=<0;?-7460?>=.37,9/C?0<-<4920904&>G<?92090490=

48?=7,9/04920=0>C>090<F>0=4=>/40=0=2020-09091,77=,?1

01,3<?9/ :=>09/0= ?9/09,9/09 ?9/09/409=>490?>=.3

7,9/C?=09/0940%H.6=09/?920<1:72>0-091,77=,?101,3<?9/

:=>09/0= ?9/09>A,42020=0>C74.309=;<H.30/0= ?9/09

?9=20209H-0<:/0<20209H-0<<4>>09-704-09,?.349/40=08

,77?9-0<H3<>

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H<,?D0<3,7-0?>=.37,9/=0<A:<-0900<F>0247>/40=0,<,9>40

94.3>=207>09/4050A047420920=0>C74.309):<=.3<41>09?9/20

20-09091,77=/40!4010<-0/492?9209/0<!F9/0<20=077=.3,1>-CA

/0=8;:<>0?<=

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ENGLISH

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1. General information

The chapter "Operation" is intended for users and contractors.

The chapter "Installation" is intended for heating contractors.

Note

Read these instructions carefully and retain them for fu-

ture reference. If the appliance is passed on to a third

party please hand these instructions to the new user.

1.1 Safety information

1.1.1 Structure of safety information

KEYWORD Type of risk

Here, possible consequences are listed that may result

from non-observation of the safety information.

f Steps to prevent the risk are listed.

1.1.2 Symbols, type of risk

ZźăĒù `źĤ¼ĒÏļêń÷

!

Injury

Burns or scalding

Fire

1.1.3 Keywords

:tqHV ¼ńļêĤŒêĒĉ

DANGER If this information is not observed, it will result in serious

injury or death.

WARNING If this information is not observed, it can result in serious

injury or death.

CAUTION If this information is not observed, it can lead to medium

or minor injury.

OPERATION ________________________________________________________ 21

1. General information _______________________________________ 21

1.1 Safety information ______________________________________________ 21

1.2 Other symbols in this documentation ______________________ 22

1.3 Units of measurement _________________________________________ 22

2. Safety ________________________________________________________ 22

2.1 Intended use _____________________________________________________ 22

2.2 Safety information ______________________________________________22

3. Equipment description ____________________________________ 22

4. Operation ___________________________________________________ 22

5. Cleaning, maintenance and care _________________________ 22

5.1 Annual inspection ______________________________________________ 22

5.2 Self-cleaning _____________________________________________________ 22

5.3 Checking the system pressure _______________________________22

6. What to do if ... ? ___________________________________________ 23

INSTALLATION _____________________________________________________ 24

7. Safety ________________________________________________________ 24

7.1 Instructions, standards and regulations ___________________ 24

7.2 Safety information ______________________________________________ 24

8. Equipment description ____________________________________ 24

8.1 Standard delivery _______________________________________________24

9. Installation __________________________________________________ 24

9.1 Preparations _____________________________________________________ 24

9.2 Pipework installation __________________________________________ 24

9.3 Air vent valve ____________________________________________________ 25

9.4 Safety valve ______________________________________________________ 25

9.5 Drain facility _____________________________________________________25

9.6 Sample installation _____________________________________________ 26

10. Installation __________________________________________________ 27

10.1 Installation location ____________________________________________ 27

10.2 Lifting onto the roof ____________________________________________28

10.3 Fixing the collector _____________________________________________ 28

10.4 Making the collector connections ___________________________28

10.5 Fitting the collector sensor well _____________________________ 28

10.6 Lightning protection ___________________________________________29

10.7 Earthing system _________________________________________________ 29

10.8 Expansion vessel ________________________________________________ 29

10.9 Flushing the pipework _________________________________________ 29

10.10 Connecting the collectors and roof outlet/duct ___________ 30

10.11 Filling the solar thermal system _____________________________30

10.12 Pressure test ____________________________________________________30

10.13 Checking the system for leaks________________________________ 30

10.14 Completing the ﬁlling procedure ____________________________ 30

10.15 Thermal insulation _____________________________________________ 31

11. Commissioning _____________________________________________ 31

12. Maintenance ________________________________________________ 31

12.1 Maintenance _____________________________________________________ 31

13. Troubleshooting ____________________________________________ 32

14. Speciﬁcation ________________________________________________ 34

14.1 Data table ________________________________________________________ 34

14.2 Dimensions _______________________________________________________ 35

GUARANTEE _______________________________________________________ 38

ENVIRONMENT AND RECYCLING _________________________________ 38

START-UP PROTOCOL _____________________________________________ 38

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1.2 Other symbols in this documentation

Note

Notes are bordered by horizontal lines above and below

the text. General information is identiﬁed by the symbol

shown on the left.

f Read these texts carefully.

ZźăĒù



Damage to the appliance and environment

Appliance disposal

Never cover the appliance

f This symbol indicates that you have to do something. The ac-

tion you need to take is described step by step.

1.3 Units of measurement

Note

All measurements are given in mm unless stated other-

wise.

1.4 Other relevant documents

Observe the operating notes contained in the operating and in-

stallation instructions of the ﬁxing sets, control units, compact

installations and cylinders.

2. Safety

2.1 Intended use

This ﬂat-plate collector is designed to heat a heat transfer medium.

Any other use beyond that described shall be deemed inappro-

priate. Observation of these instructions is also part of the correct

use of this appliance.

2.2 Safety information

All steps up to the commissioning of this appliance must only be

carried out by qualiﬁed contractors.

Contractors are responsible for adherence to all currently applica-

ble regulations during installation and commissioning.

Operate the solar thermal system only if it is fully installed and all

safety equipment is ﬁtted.

!

DANGER Injury

Where children or persons with limited physical, sensory

or mental capabilities are to be allowed to control this

system, ensure that this will only happen under super-

vision or after appropriate instructions by a person re-

sponsible for their safety. Children should be supervised

to ensure that they never play with the equipment.

3. Equipment description

The ﬂat-plate collector converts light into heat.

The light penetrates the glass cover. This is made from pre-stres-

sed, highly transparent single pane safety glass. The light strikes

the absorber and is converted there into heat. The highly selective

coating of the absorber and the thermal insulation on the back of

the absorber reduce heat losses to the ambience to a minimum.

A circulating heat transfer medium is pumped to the DHW cylinder,

thus transferring the energy generated by the collector in the form

of heat. Under certain operating conditions, the inside of the col-

lector may mist up with condensate. This can happen, for example,

with a large DHW cylinder with low temperature compared to the

environment or high atmospheric humidity.

4. Operation

The solar thermal system is designed so that no special measures

are required if no hot water is drawn, even for a prolonged period

(e.g. during a summer holiday).



Damage to the appliance and environment

The process medium must not be drained off when the

system is shut down.

5. Cleaning, maintenance and care

5.1 Annual inspection

Ask your heating contractor to check the solar thermal system an-

nually

.

5.2 Self-cleaning

Generally, solar collectors require no cleaning, as they are largely

self-cleaning. However, in case of severe contamination, e.g. dust

or avian excrement, clean the collector with fresh water.



Damage to the appliance and environment

If you want to clean the collector with water, ensure that

the collector has not already been heated up by strong

sunlight.

5.3 Checking the system pressure

f Regularly check the pressure of the heat transfer medium

at the pressure gauge of the solar module. With a cold solar

thermal system (collector temperature below 30 °C), the

pressure should be between 0.35 and 0.4 MPa.

Notify your heating contractor if you notice large deviations from

the set value.

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ENGLISH

6. What to do if ... ?

The following contains descriptions of what measures to take in

order to remedy faults. If you are still unable to ﬁx the problem

using this information, please consult your heating contractor.

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Fault/error message at the controller. There is a fault in the system; the sensor is faulty or incor-

rectly connected.

Please refer to the controller operating and installa-

tion instructions.

Pressure fluctuations in the system. If the problem occurs immediately after commissioning,

there is air in the solar circuit.

Please consult a qualified contractor.

The collectors are misted up.

Moisture has entered the collector during storage.

The internal mist will evaporate after a few weeks

in operation. The moisture will progressively escape

through the integral ventilation slots.

The pump does not run although the collector

is warmer than the cylinder (no noise from the

motor, no noticeable vibration).

The maximum cylinder or collector temperature is excee-

ded. The control indicator or display on the controller is

activated.

The controller has shut down correctly and restarts

again automatically when the actual temperature

drops below their selected maximum temperature.

The power supply is interrupted. Check fuses/MCBs.

Other cause. Please consult a qualified contractor.

The pump is running, but no flow rate is di-

scernible at the flow meter with balancing

valve. The flow and return temperatures are

identical or the cylinder temperature does not

rise or rises only slowly.

Please consult a qualified contractor.

The pump is running, but no flow rate is

discernible at the flow meter with balan-

cing valve.

The shut-off valve is closed. Open the shut-off valve.

Other cause. Please consult a qualified contractor.

The pump appears to open late and switch

itself off early.

Please consult a qualified contractor.

The pump starts and switches itself off again

shortly afterwards. This repeats a few times

until the system runs correctly. The same hap-

pens in the evening.

There is still too little insolation to heat up the entire pi-

pework.

Check for faults again when there is strong insolation.

Other cause. Please consult a qualified contractor.

The pressure gauge indicates a drop in pres-

sure.

A pressure drop shortly after the system is filled is quite

normal, as air is still escaping from the system. A pres-

sure drop later on can be caused by an air lock that has

shifted. In addition during normal operation, the pressure

fluctuates by 0.02-0.03 bar depending on the system tem-

perature. If the pressure drops continuously, the system is

leaking somewhere.

Please consult a qualified contractor.

The pump runs noisily. Please consult a qualified contractor.

The system runs noisily. This is normal in the

first few days after filling the system. If this

occurs later:

Please consult a qualified contractor.

The cylinder cools down over night. After the

pump has stopped, the flow and return operate

at different temperatures. At night the col-

lector temperature is higher than the outside

temperature.

The gravity brake does not close.

Check the position of the adjusting screw on the gra-

vity brake.

Other cause. Please consult a qualified contractor.

Reheating does not work. The boiler runs for a

short while, stops and starts again. This repe-

ats frequently, until the cylinder has reached

its set temperature.

Please consult a qualified contractor.

The cylinder cools down excessively. Please consult a qualified contractor.

The pump does not switch off.

The control unit is faulty. The variable speed pump does not stop immediately

but only after it reaches its lowest speed.

Other cause. Please consult a qualified contractor.

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7. Safety

Only qualiﬁed contractors should carry out installation, commis-

sioning, maintenance and repair.

7.1 Instructions, standards and regulations

Note

Observe all applicable national and regional regulations

and instructions.

7.2 Safety information

!

WARNING Injury

A solar collector generates heat when exposed to sun-

light or other types of light. This leads to collector con-

nectors getting very hot, even when they are not ﬁlled.

There is a risk of burns and the collector suffering dama-

ge. Cover the collectors with opaque material until they

are fully installed. It is advisable to leave collectors in

their packaging until they are installed.



Damage to the appliance and environment

Be careful not to drop the collector. Be careful not to

drop any objects on the collector. Do not step onto the

collector.



Damage to the appliance and environment

Do not leave the collector unsecured. It the collector falls

down, the glass may break.

8. Equipment description

The collector is ﬁtted with a full area aluminium absorber with

highly selective coating. The ﬂat packing connections are routed

out of the side. The collector connection on the left side has a

male thread, and the collector connection on the right side has

a union nut.

A safety glass cover protects the collector. Operating the collector

with the prepared heat transfer medium (see "Speciﬁcation") pro-

vides the essential frost protection. The collector casing is made

from seawater-resistant aluminium.

8.1 Standard delivery

- Flat-plate collector

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ENGLISH

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9. Installation

Only qualiﬁed contractors should carry out installation, commis-

sioning, maintenance and repair.

Observe the accident prevention instructions.

Note

For hydraulic reasons, never link up more than ﬁve col-

lectors in series. Where several rows of collectors are

ﬁtted, they must be connected in parallel.

Note

The type-testing is limited to single hydraulic assemblies

of no more than 30 individual collectors. An individual

inspection is required for larger systems.

Note

Commercial systems, the open content of which exceeds

10 litres and is not more than 50 litres, require notiﬁca-

tion to the relevant local authority [in Germany - check

local regulations].



Damage to the appliance and environment

When ﬁlling the solar thermal system with frost and

corrosion protection, use only the heat transfer medium

which is mentioned in the table "Speciﬁcation".

9.1 Preparations

Provide all pipe runs to the building interior on site.

9.2 Pipework installation

Use copper, stainless steel or corrugated stainless steel hoses

when installing the ﬂow and return lines. With a system com-

prising up to four collectors, we recommend a pipe diameter of

Ø 18 x 1.0.

Ventilation tiles are recommended as roof outlets for tiled or sla-

te-covered roofs with more severe inclination.

For ﬂat roofs and corrugated roofs with lesser pitches, routing the

pipes through an external wall is recommended.

Avoid sawing off pipes to prevent swarf entering the system. Use

a pipe cutter for swarf-free cutting.

9.2.1 Soldered lines

Soldered lines must be brazed. Use solder to DIN EN 1044: CP105

and CP203. Use this solder without ﬂux. Only solder gunmetal

and brass ﬁttings with ﬂux F-SH-1 to EN 1045. Other ﬂux has a

detrimental effect on corrosion resistance.

9.2.2 Alternative lines

Seal lines made with locking ring ﬁttings, press ﬁttings and cor-

rugated hoses by suitable means. Seals must be resistant to glycol

and temperatures up to 180 °C.



Damage to the appliance and environment

Apply the thermal insulation only following a successful

leak test.

9.3 Air vent valve

Install a lockable manual air vent valve at a high point of the

system or route a ventilation line to a manual air vent valve. Auto-

matic quick-acting air vent valves installed close to the collector

must be able to be isolated from the system with a shut-off valve.

9.4 Safety valve



Damage to the appliance and environment

There must not be any shut-off ﬁttings between the col-

lectors and the safety valve.

The safety valve must discharge into a container that can hold the

entire content of the system. In case of smaller systems, the empty

heat transfer medium can is adequate.

9.5 Drain facility

f Install a drain valve at the lowest point of the solar thermal

system.

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9.6 Sample installation

The system diagram shows the design principle of a solar ther-

mal system.

III

26_05_01_0061

2k

10

4

1b

2

5

6

3f

3

10

11

7

V

2a

28

16

2s

III Collector

V Central heating

1b Manual air vent valve

2 Control unit

2a Outside temperature sensor

2k Temperature sensor in the collector sensor well

2s Solar thermal system cylinder temperature sensor

3f Solar thermal system DHW heating circuit pump

4 Solar module

5 Safety valve

6 Expansion vessel

7 Cylinder

10 Fill & drain valve

11 Alternative heat source (heat pump for example)

16 Set temperature remote controller

28 Cold water safety assembly to DIN 1988

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ENGLISH

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10. Installation

!

WARNING Injury

Take care when handling sharp edges. Wear suitable sa-

fety equipment.

10.1 Installation location

!

DANGER Injury

When working on roofs, observe applicable safety re-

gulations.

Have all roof work carried out by a qualiﬁed contractor.

f Check the condition of the roof structure. Observe the static

calculation. If necessary, apply for planning permission with

the relevant authority.

10.1.1 Edge and corner areas

Roof edges, and here particularly the corners, are areas exposed

to strong winds and turbulence. Minimum clearances must the-

refore be maintained.

26_05_01_0237

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A < 30 m A/8, but 1 m ≤ R ≤ 2 m

A ≥ 30 m A/8

The width of the edge/corner area "R" is 1/8 of the narrower

roof side (A), but should be at least 1 m.

In residential buildings, ofﬁce buildings and closed halls where

"A" is shorter than 30 m, the width of the edge area may be lim-

ited to 2 m.

The corner areas always have a square area with a side length

A/8.

Roof outlets

26_05_01_0607

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0.5 m < b ≤ 2 m 1 m

b > 2 m b/2, but 1 m ≤ D ≤ 2 m

Roof outlets include components that protrude more than 0.35 m

above the upper edge of the roof material at one or more points,

and that have a side measurement of at least 0.5 m. The width of

the associated edge area "D" is 1/2 of the longer component side

"b", but at least 1 m. The edge area may be limited to 2 m in width.

10.1.2 Standard snow loads for Germany

When installing the solar collectors, observe the required mini-

mum angle of inclination. This is based on the snow load zone in

which the collectors are installed. Your local Planning Ofﬁce will

provide the relevant information. When making this calculation it

is assumed that the snow can slide off the roof unimpeded.

+¼êÖäŒêĉă

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Z< Ĝ Ĝ| ŝ ŝ| ŗ

100 • • • • •

200 • • • • •

300 • • • • •

400 • • • • > 32°

500 • • • > 35° > 39°

600 • • > 37° > 41° > 44°

700 • • > 41° > 45° > 48°

800 • > 36° > 45° > 48° > 50°

900 > 35° > 40° > 48° > 50° > 52°

1000 > 39° > 43° > 49° > 52° > 53°

1100 > 42° > 46° > 51° > 53° > 54°

1200 > 44° > 48° > 53° > 54° > 55°

1300 > 47° > 49° > 54° > 55° > 56°

x Any angle of inclination (see chapter "Speciﬁcation")

* In accordance with the relevant Planning Ofﬁce

The standard snow load must also never be exceeded through the

formation of snow traps, snow drifts and ice.

10.1.3 Installed height

The collector frames are designed for a maximum installed height

of 20 m and a snow load of 1.25 kN/m². This corresponds to a

standard snow load of 1.2 kN/m².

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10.2 Lifting onto the roof

You can pull the collector onto the roof over a ladder. To do this,

place a rope around the collector frame.

Never secure the rope to the collector connections.

26_05_01_0443

1

2

1 Rope

2 Collector

26_05_01_0442

10.3 Fixing the collector

Install the collector in accordance with the installation instructions

for the ﬁxing system being used.



Damage to the appliance and the environment

If there is strong sunlight, the collectors should be cove-

red with opaque material before commissioning.

10.4 Making the collector connections

Interconnect the collectors. The collector connection on the left

side has a male thread, and the collector connection on the right

side has a union nut.

26_05_01_0129

10.5 Fitting the collector sensor well

The correct connection of the collector sensor is crucial to the

correct function of the solar thermal system.

Assemble the collector sensor well at the collector ﬂow, which is

the warmest place of the collector array.

26_05_01_0112

1

4

2

5

6

3

1 Roof outlet (corrugated hose)

2 Thermal insulation

3 Collector sensor well

4 Threaded ﬁtting

5 Heat conducting paste

6 Temperature sensor

f Coat the collector sensor of the control unit with heat

conducting paste.

f Insert the collector sensor into the collector sensor well until

it bottoms.

f Secure the sensor lead, with cable ties for example.

Never adjust or twist the ﬁtted connections.

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ENGLISH

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10.6 Lightning protection

If the building already has a lightning protection system, the col-

lector casing, mounting frame and pipework must be connected

to the existing lightning protection scheme.

10.6.1 Collector casing lightning protection

Connect the collector to the lightning protection system using

screw fittings. Use two stainless steel self-tapping screws

(Ø 6.3 mm) per collector.

f Pre-drill the holes (Ø 5 mm). Position the drill holes on the

lower part of the front of the collector in the area which is

shaded in the following illustration. When drilling the holes,

maintain a distance of at least 100 mm from the corner of the

collector casing.

26_05_01_0082

min. 100 mm

1

1 Drill holes (Ø= 5 mm)

10.6.2 Mounting frame lightning protection

f Connect the mounting frame to the lightning protection sys-

tem using screw or clamp connections.

10.6.3 Pipework lightning protection

f Connect the pipework to the lightning protection system in

close proximity to the collector (above the roof) using pipe

clips.

10.7 Earthing system

f Earth the pipework in accordance with current regulations.

All pipes must be connected to the building earthing system via

a short connection.

10.8 Expansion vessel

f Set the expansion vessel to a pre-charge pressure of

0.3 MPa (3 bar).

10.9 Flushing the pipework

Before connecting the collectors, thoroughly ﬂush the pipework

installed in the building with water so that no foreign matter

remains in the system.

Note

Flush the system with fresh water and not with heat

transfer medium.



Damage to the appliance and the environment

Avoid frost periods when you ﬂush the system with water.

Use a powerful pump with an operating pressure of approximately

0.4 MPa (4 bar) for ﬂushing.

Alternatively, you can also use a power drill pump.

26_05_01_0515

2

1

3

4

1 Solar compact installation

2 Heat transfer medium

3 Filter

4 Fill pump

Possible method:

f Connect the water supply to the ﬁll & drain valve beneath the

pressure gauge

f Connect the water drain to the ﬁll & drain valve beneath the

ﬂow meter.

f Connect the solar ﬂow and the solar return with a water

hose. This way, you replace the collector line which will not

be connected until later, and prevents contamination from

being drawn into the collector pipes.

f Close the adjusting valve in the solar module by turning the

slot on the ﬂow rate adjusting screw (above the ﬂow rate dis-

play) to the horizontal position. This ensures that the entire

system is supplied.

f Disable the gravity brake by turning the ﬁll & drain valve to a

45° position.

f Close the shut-off valves upstream of the air vent valves.

f Flush the pipes for at least 15 minutes.

f After ﬂushing, open the adjusting valve in the solar module

by turning the slot on the ﬂow rate adjusting screw (above

the ﬂow rate display) to the vertical position.

f Remove the hose which replaced the collector line and allow

the pipes to fully drain.

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10.10 Connecting the collectors and roof outlet/duct

Using two ﬂexible stainless steel corrugated tubes, connect the

collector array to the ﬂushed pipework.

f Using ﬂat packing and union nuts, attach the corrugated

pipes to the collector connections or the collector sensor

well.

The stainless steel corrugated tubes are factory-ﬁtted with ther-

mal insulation that is resistant to temperature and UV.

10.11 Filling the solar thermal system

!

CAUTION Injury

f Put on protective gloves before handling the heat

transfer medium.

f Wear suitable safety goggles.

f Observe the EC's heat transfer medium safety da-

tasheet that is printed at the end of these instructi-

ons.

Before ﬁlling the heat transfer medium circuit, ensure that the

pipework installation has been completed, the collectors are con-

nected and the cylinder has been ﬁlled.

A powerful pump with an operating pressure of approximately

0.4 MPa (4 bar) should be used for ﬁlling. Due to the high ﬂow

velocity, the air will be fully expelled.

Use only the heat transfer medium mentioned in the table "Speci-

ﬁcation". The bottles have been premixed and require no further

treatment.



Damage to the appliance and the environment

Never admix water or alternative heat transfer media.

Otherwise, the essential characteristics and corrosion

protection can no longer be guaranteed.



Damage to the appliance and the environment

Never ﬁll the system during strong sunlight. This could

lead to steam hammer inside the collectors. Cover

the collectors.

10.11.1 Preparation

» Ensure that the collectors are covered for the pressure test.

» Remove the safety valve and close the connection.

10.11.2 Filling the solar thermal system

During all ﬁlling and draining procedures, open the air vent valve

at the highest point of the system. Close the shut-off valves ups-

tream of the air vents as soon as heat transfer medium is expelled.

f Using a hose, connect the pressure side of the ﬁll pump to

the ﬁll & drain valve beneath the pressure gauge.

f Connect the heat transfer medium container to the inlet side

of the pump.

f On the lower ﬁll & drain valve, attach a drain hose and route

it into the heat transfer medium container.

f Close the adjusting valve in the solar module by turning the

slot on the ﬂow rate adjusting screw (above the ﬂow rate dis-

play) to the horizontal position.

f Disable the gravity brake by turning the ﬁll & drain valve to a

45° position.

f Switch the ﬁll pump ON.

Continue the ﬁlling process until no more bubbles are expelled

from the drain hose.

f Close the drain valve and ﬁll up to a pressure of approxima-

tely 0.35 MPa (3.5 bar).

f Open the air vent valves at the highest point of the system

and close them again as soon as heat transfer medium is

expelled.

10.12 Pressure test

f Close the shut-off valves upstream of the air vent valves to

eliminate a loss of pressure.

f Using a hydraulic lifting pump, for example, pressurise the

system to 0.78 MPa (7.8 bar) in the system.

f Close the ﬁll & drain valve on the ﬁlling side.

f Close the cap valve in order to be able to measure the

pressure drop.

The pressure must not drop for 15 minutes.

The system must be drained again to assemble the safety valve.

f Open the air vent valve at the highest point of the system.

f Open the adjusting valve in the solar module by turning the

slot on the ﬂow rate adjusting screw (above the ﬂow rate dis-

play) to the vertical position.

f To drain the system, open the ﬁll & drain valves on the ﬁll

and drain sides.

f Allow the system to fully drain.

f Open the cap valve.



Damage to the appliance and the environment

Following a pressure test, ﬁt the safety valve.

10.13 Checking the system for leaks



Damage to the appliance and the environment

The thermal insulation may only be applied following a

successful leak test.

f Reﬁll the system.

f Using the ﬁll pump, build a pressure of 0.5 MPa (5 bar).

f The test pressure must not drop for a period of two hours.

f Pressure ﬂuctuations are possible due to changing insolation

even when the collectors are covered.

f Carry out a visual inspection of all joints on the solar thermal

system.

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ENGLISH

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10.14 Completing the ﬁlling procedure

f Reduce the system pressure to the required ﬁlling pressure.

The minimum ﬁlling pressure of a cold system is 0.35 MPa

(3.5 bar).

f Close both ﬁll & drain valves with the caps supplied.

f Attach the heat transfer medium safety datasheet to the

system.

f Allow the solar thermal system to rest overnight.

f Before the onset of strong sunlight, vent the system once

more the following morning using the air vent valve.

f Enable the gravity brake by turning the ﬁll & drain valve to a

vertical position.

Note

During normal operation, the shut-off valves upstream

of the air vent valves in close proximity to the collector

must always be kept closed.



Damage to the appliance and the environment

The safety valve drain must terminate in a container that

can hold the entire system contents. In case of smaller

systems, the empty heat transfer medium can is ade-

quate. Dispose of spent process medium by permissible

means.

10.15 Thermal insulation

Ensure that the system undergoes a pressure test and a leak test

before applying thermal insulation.

Insulate all pipes. The insulation material is to be provided on site.

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to 20 20

20 - 35 30

40 - 100 identical DN

above 100 100

For insulation material with a different thermal conductivity,

re-calculate the thickness of the insulation layer.

Use temperature and UV-resistant insulation material to provide

thermal insulation for the external pipes: Mineral wool which is

backed by aluminium mesh foil, a ﬂexible EPDM hose or a clo-

sed-pore EPDM hose.

It is advisable to use a ﬁxed armour made of aluminium sheet

around the mineral wool. The EPDM hose can be ﬁnished with

UV-resistant paint.

f Provide the collector sensor well and the roof outlet with

thermal insulation, which must be tightly sealed and must be

temperature and UV-resistant.

f If necessary, cut into the side of the insulation material and

seal the slit with adhesive tape after installation.

f Where required, protect the thermal insulation against bird

or rodent attack.

11. Commissioning

f Retighten all ﬁttings.

f Check the system's ﬁlling pressure.

Note

The minimum ﬁlling pressure of a cold system (below

30 °C) is 0.35 MPa (3.5 bar).

f Check the pre-charge pressure of the expansion vessel.

Note

The expansion vessel must have a pre-charge pressure

of 0.3 MPa (3 bar).

f Complete the "Commissioning report".

f Set the integral control unit to manual. Please observe the

operating and installation instructions of the control unit

which is ﬁtted into the system.

f Check whether all required relays of the solar control unit are

connected.

f Set the control unit back to automatic mode.

The system should then start automatically subject to all starting

conditions being met. If this is not the case, check in chapter

"What to do if ..." for a possible cause for this fault.

12. Maintenance

Note

We offer you the opportunity to take out a maintenance

contract.

12.1 Maintenance

f Check that the system, including the control unit, safety

equipment and cylinder, is functioning correctly.

f Check the parts of the system exposed to the weather, moun-

ting ﬁxtures and thermal insulation to ensure that they are in

acceptable condition.

f Remove contaminants.

f Check the pH value (> 7) and frost protection level (-- 30 °C)

of the heat transfer medium. If necessary, replace the heat

transfer medium or top it up via the ﬁller inlet in the solar

module.

!

CAUTION Injury

If the heat transfer medium needs to be drained to carry

out maintenance or repair work, this work must be car-

ried out by a qualiﬁed contractor.



Damage to the appliance and the environment

Before you remove the heat transfer medium from the

collector, the collector must be protected from daylight.

Cover the collector with an opaque material.

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13. Troubleshooting

The following table of faults also contains all troubleshooting measures included in the chapter "What to do if"

%|şùŒ |şń¼ V¼ă¼®ź

Fault/error message at the controller. There is a fault in the system; the sensor is faulty or

incorrectly connected.

Please refer to the controller operating and installation in-

structions.

Pressure fluctuations in the system. If the problem occurs immediately after commissio-

ning, there is air in the solar circuit.

Vent the system.

The collectors are misted up.

Moisture has entered the collector during storage.

The internal mist will evaporate after a few weeks in ope-

ration. The moisture will progressively escape through the

integral ventilation slots.

The pump does not run although the collector

is warmer than the cylinder (no noise from the

motor, no noticeable vibration).

The maximum cylinder or collector temperature is

exceeded. The control indicator or display on the

controller is activated.

The controller has shut down correctly and restarts again

automatically when the actual temperature drops below the

selected maximum temperature.

The power supply is interrupted. Check pipes and fuses/MCBs.

Excessive temperature differential (>15 °C) selected

or the controller does not work.

Check the controller.

Check the temperature sensor.

Reduce the temperature differential.

Pump shaft blocked.

Briefly switch to maximum speed or, if possible, open the

vent screw on the pump. Insert a screwdriver into the notch

and turn the pump wheel by hand.

The pump is contaminated. Dismantle and clean the pump. Close the flow limiter and the

pump ball valve.

The sensor is faulty. Replace the sensor.

The sensor is fitted incorrectly. Check the position of the sensor. The collector sensor must be

fully inserted into the collector sensor well.

The pump is running, but no flow rate is di-

scernible at the flow meter with balancing

valve. The flow and return temperatures are

identical or the cylinder temperature does not

rise or rises only slowly.

There is air in the pipework,

the system pressure is too low or

the system is contaminated.

Check the system pressure. Check whether the selected

expansion vessel is large enough. Check the pre-charge pres-

sure of the expansion vessel.

Operate the pump in intervals at maximum pump rate.

Open the air vent valves on the collector, pump and solar cy-

linder.

Flush the system forwards and backwards. Clean fitted com-

ponents, such as the flow meter with the balancing valve and

the dirt trap.

Check the line routing. In case of "up and down" line routing,

e.g. at balcony protrusions or around water pipes, change the

line routing, if required or insert an additional air vent valve.

Ensure that no automatic air vent valves are positioned close

to the collector which cannot be disconnected from the sys-

tem using a fill & drain valve.

Check that the automatic air vent valve is operating correctly.

For this, undo the protective cap and check the float with a

blunt needle to ensure it moves easily. Replace the air vent

valve if required.

The pump is running, but no flow rate is

discernible at the flow meter with balan-

cing valve.

The flow meter with balancing valve is stuck.

Check the function of the flow meter with balancing valve. A

jammed ring, for example, can block the display in the sight

glass, even if the flow rate is correctly adjusted. Switch the

pump ON in manual mode. The pump piston movement must

be discernible. Release the piston by tapping it lightly. Repla-

ce the flow meter and balancing valve if necessary.

The shut-off valve is closed. Open the shut-off valve.

The pump appears to open late and switch

itself off early.

Excessive temperature differential between collec-

tor and cylinder.

Reduce the temperature differential at the control unit.

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ENGLISH

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The pump starts and switches itself off again

shortly afterwards. This repeats a few times

until the system runs correctly. The same hap-

pens in the evening.

There is still too little insolation to heat up the ent-

ire pipework.

Check for faults again when there is strong insolation.

The flow rate is too high (the pump is set too high). Reduce the output stage of the pump.

The switching temperature differential of the con-

troller is set too low.

Increase the switching temperature differential on the con-

troller.

The pipework is not fully insulated. Insulate all pipes.

The cylinder and collector sensors are interchan-

ged. (The problem occurs after commissioning).

Connect the temperature sensors to the correct sensor

terminals (see the control unit installation and operating in-

structions).

The pressure gauge indicates a drop in pres-

sure.

A pressure drop shortly after the system is filled is

quite normal, as air is still escaping from the sys-

tem. A pressure drop later on can be caused by an

air lock that has shifted. In addition during normal

operation, the pressure fluctuates by 0.02-0.03 MPa

depending on the system temperature. If the

pressure drops continuously, the system is leaking

somewhere.

Is the automatic air vent valve closed?

Check the threaded fittings, glands on shut-off valves and

threaded connections. Check the soldered joints.

Check the pre-charge pressure of the expension vessel and

ensure the diaphragm is not leaking.

Fluid loss as a result of opening the safety

valve, because the expansion vessel is not large

enough,or it is depressurised or faulty. Collector

damage (leaking) and frost damage through insuf-

ficient frost protection.

Check the vessel size. Check the antifreeze level and the

pH value.

The pump runs noisily. Air in the pump. Vent the pump.

Inadequate system pressure. Increase the system pressure.

The system runs noisily. This is normal in the

first few days after filling. There are two possi-

ble causes if this occurs later:

The system pressure is too low. The pump draws in

air via the air vent valve.

Check whether the selected expansion vessel is large enough.

Check the pre-charge pressure of the expansion vessel. In-

crease the system pressure.

The pump rate is too high. Change to a lower pump rate and check the flow rate at the

flow meter with balancing valve.

The cylinder cools down over night. After the

pump has stopped, the flow and return operate

at different temperatures. At night the collector

temperature is higher than the outside tem-

perature.

The gravity brake does not close.

Check the position of the adjusting screw. Check the gravity

brake for leaks. Has swarf become jammed or are there dirt

particles on the sealing surface?

Single pipe circulation for short pipework with low

pressure drop.

Change the line routing. Never connect the solar heat ex-

changer directly but draw the supply lines first in a U dow-

nwards. The siphon assists the gravity brake. If required,

install a two-way valve that is switched simultaneously with

the pump.

Reheating does not work. The boiler runs for a

short while, stops and starts again. This repe-

ats frequently, until the cylinder has reached

its set temperature.

There is air in the reheat indirect coil. Vent the reheat indirect coil.

The indirect coil surface area is too small.

Compare the details supplied by the boiler manufacturer and

those of the cylinder manufacturer. The problem may be re-

solved by selecting a higher flow temperature at the boiler.

The cylinder cools down excessively.

The insulation is faulty or incorrectly fitted.

Check whether the insulation is intact. Insulate the cylinder

connections.

Incorrect setting of the control unit for reheating. Check the setting on the boiler control unit.

DHW circulation runs too frequently and/or at night. Check the switching times and the interval operation.

The pump does not switch off.

Sensor faulty or incorrectly positioned. Check the sensor position, installation and curves.

The control unit is faulty. Note: The variable speed pump does not stop immediately

but only after it reaches its lowest speed.

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14. Speciﬁcation

14.1 Dimensions

14.1.1 SOL 27 basic











80_05_01_0002

14.1.2 SOL 27 basic W



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





80_05_01_0003

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ENGLISH

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14.2 Data table

  ZH<ŝŌ|ńê ZH<ŝŌ|ńêq

228927 230912

Version Rooftop Rooftop

Collector type Flat-plate collector Flat-plate collector

Type Vertical Horizontal

Frame colour silver silver

Height mm 2168 1168

Width mm 1168 2168

Depth mm 93 93

Weight kg 38,5 39,2

Casing material Aluminium, salt water resistant Aluminium, salt water resistant

Glass cover ESG ESG

Glass thickness mm 3,2 3,2

Thermal insulation thickness mm 50 50

Thermal insulation material Mineral wool, low outgassing, WLG 040 Mineral wool, low outgassing, WLG 040

Collector connection G 3/4 G 3/4

Max. idle temperature °C 213 >210

Min. operating pressure MPa 0,35 0,35

Max. permissible pressure MPa 0,6 0,6

Pressure drop at 300 l/h MPa 0,0035 0,0035

Test pressure MPa 1,7 1,7

Test medium Water (at the factory) Water (at the factory)

Heat transfer medium H-30 L/LS H-30 L/LS

Fill level, heat transfer medium l 1,3 1,7

Nominal volume flow l/h 50...300 50...300

Angle of inclination 20°...85° 20°...85°

Total area m² 2,53 2,53

Aperture area m² 2,39 2,39

Absorber area m² 2,38 2,38

Absorber Aluminium, highly spec Miro-Therm coating,

copper pipes, laser welded

Aluminium, highly spec Miro-Therm coating,

copper pipes, laser welded

Gasket EPDM EPDM

Conversion factor η₀ 0,79 ≥0,78

Effective heat transfer coefficient a1 W/(m²K) 3,42 3,42

Effective heat transfer coefficient a2 W/m²K² 0,0142 0,0142

Radiation angle correction factor K

θb

(50°) 0,93 0,93

Thermal capacity c kJ/m²K 5 5

Absorption level α % 95±2 95±2

Emission level ε % 5±1 5±1

Collector yield kWh/(m² p.a.) >525 >525

The collector yield is based on a calculation of the annual energy

yield in a reference system for DHW heating, with reference to

EN12975 with a ﬁxed coverage of 40% and a daily consumption

of 200litres in the city of Würzburg.

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14.1 Misure

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STIEBEL ELTRON SOL 27 basic Operation Instruction

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