Strebel S-HR 15, S-HR 24, S-HR 24T, S-HR 35, S-HR 35T Installation Instructions Manual

INSTALLATION INSTRUCTIONS

8G.51.21.01/11.99 changes reserved

Installation instructions S-HR series page 3

S-HR 15 S-HR 24/24T S-HR 35/35T S-HR 51/51T S-HR 60

Contents page

1 Description of the unit ................................................................................................................... 4

2 Scope of the delivery ..................................................................................................................... 4

3 Mounting of the unit ....................................................................................................................... 4

3.1 Dimensions ......................................................................................................................... 5

4 Connecting the unit ....................................................................................................................... 6

4.1 Central heating system .......................................................................................................7

4.2 Expansion tank.................................................................................................................... 8

4.3 Underfloor heating systems............................................................................................... 10

4.4 Gas pipe ............................................................................................................................ 10

4.5 Hot water supply (S-HR-T) ................................................................................................ 10

4.6 Condensation discharge pipe ............................................................................................ 10

4.7 Flue gas exhaust system and air supply system ............................................................... 11

5 External calorifiers ....................................................................................................................... 12

6 Electrical connection ................................................................................................................... 12

7 Control of the unit ........................................................................................................................ 14

7.1 Explanation of the function keys........................................................................................ 14

8 Filling and venting of unit and installation .................................................................................... 15

8.1 Central heating system ..................................................................................................... 15

8.2 Hot water supply ............................................................................................................... 15

9 Putting the unit into operation...................................................................................................... 16

9.1 Central Heating system ..................................................................................................... 16

9.2 Hot water supply ............................................................................................................... 16

9.3 Adjustments ...................................................................................................................... 16

10 Switching off the unit ................................................................................................................... 20

11 Commissioning and maintenance ............................................................................................... 20

11.1 Checking for contamination ............................................................................................... 20

11.2 Checking of the zero pressure control ............................................................................... 20

11.3 Checking the CO2 .............................................................................................................. 21

11.4 Maintenance...................................................................................................................... 22

11.5 Further checks .................................................................................................................. 22

11.6 The frequency of maintenance .......................................................................................... 22

12 Technical specifications .............................................................................................................. 23

13 Diagram showing various parts of the unit .................................................................................. 24

14 Example diagrams for connecting the unit .................................................................................. 26

14.1 Radiator installation without thermostat valves ................................................................. 26

14.2 radiator installation with thermostat valves only ................................................................ 27

14.3 radiator installation with an under floor heating zone ........................................................ 28

14.4 radiator installation and an independent underfloor heating zone ..................................... 29

14.5 two independent radiator zones ........................................................................................ 30

15 Error indication ............................................................................................................................ 31

Installation instructions S-HR series page 4

1 Description of the unit

The STREBEL S-HR Boiler is a room sealed,
condensating and modulating central heating unit, with
or without an integrated hot water facility.
The built-in fan sucks the combustion air from outside
and provides full premixing of the gas and air. The gas
mixture is guided through the ceramic burner which is
fitted above the heat exchanger. As a result of the small
flame height a compact construction is possible. The
combustion gasses are exhausted after passing
through the stainless steel heat exchanger. The formed
condensation water is discharged through the waste
trap.

The unit has been tested according to valid CE*
standards and has a CE* certificate.
The operating efficiency of the unit is higher than 98%
(on top value). As a result of its compact construction the
radiation, convection and stand by losses are very low.
The emission of damaging substances is far below the
standard set for equipment with the gas quality-control
label for clean combustion.

The unit is provided with an automatic venting program.
In case of a recently topped up or filled up installation
this program takes care of the removal of any present
air. In this case the control will check the water pressure
and if it is too low, will report this on the display.

The unit anticipates the heat requirement of the central
heating installation or the hot water supply. As a result
the unit will adjust its capacity to the installation and will
switch on less often, which means that the unit will
operate longer and at a low level. It is possible that the
unit will only have to switch on once an hour. In this case
the aim is to obtain maximum comfort and efficiency.

In order to be able to anticipate installation noises the
unit has a so-called gradient control. After the unit goes
into operation this control provides a uniform increase of
power, instead of immediately burning at full power.
When the installation does require full power the control
will adjust as required. By this means a uniform increase
of the water temperature is effected.
If an outside sensor is connected, the control can
operate weather-dependent. This means that the
control measures the outside temperature and the flow
water temperature. On the basis of this data the control
calculates the optimal flow water temperature in the
installation.

The S-HR-T combination unit provides a hot water
supply by means of a high output calorifier fitted on the
right hand side of the unit. An adjustable thermostatic
mixing valve is fitted which provides a constant hot
water temperature (60

°

C factory setting).

2 Scope of the delivery

The unit is supplied ready for use. The supply kit is
composed as follows:

- Unit with casing;

- Automatic vent (inside the unit);

- Safety valve (inside the unit);

- Inlet combination and safety valve (only with S-HR­T units);

- Suspension bracket

- Filling and draining valve with T-piece;

- Fixing material consisting of plugs and screws;

- Template on the package wrapper;

- Installation instructions

- Operating manual;

- Installation and user card.

3 Mounting of the unit

The unit can be mounted practically to every wall with
the mounting bracket and the included fixingequipment.
The wall must be flat and of sufficient strength in order
to be able to carry the unit weight.
Above the unit there must be at least 250 mm working
space in order to be able to fit a twin supply and exhaust
system or 500mm when fitting a horizontal coaxial flue
system. On the left side of the unit at least 50 mm and
on the right side 10 mm must be reserved in connection
with fitting or removing of the casing. The location of the
unit can be determined by using the template on the
inside of the wrapper.

Installation instructions S-HR series page 5

3.1 Dimensions

Dimensions (in mm) figure 1

wall

C

E

F

A

U

T

S

wall

B

M

N

P

Q

R

B

wall

D

H

J

K

1050

G

Dimensions table 1

tinufoepyt

RH-S

51

RH-S

42

RH-S

T42

RH-S

53

RH-S

T53

RH-S

15

RH-S

T15

RH-S

06

A thgieh

mm086086086086086086086086

B htdiw

mm0050050480050480660001066

C htped

mm073073073073073073073073

D tsuahxesageulf/edistfel

mm533533533533533594594594

E

tsuahxesageulf/ertnecotertnec

ylppusdna

mm021021021021021021021021

F tsuahxesageulf/kcab

mm072072072072072072072072

G epipsag/edistfel

mm5656565656565656

H epipwolf/edistfel

mm581581581581581581581581

J epipnruter/edistfel

mm582582582582582544544544

K epipnoitasnednoc/edistfel

mm073073073073073035035035

L epipknatnoisnapxe/edistfel

mm034034095

M epipretawdloc/edistfel

mm527527588

N epipretawtoh/edistfel

mm597597559

P *gfothgnelepip

mm8181818181818181

Q *kdnacfothgnelepip

mm0404040404040404

R *wdnae;r;afothgnelepip

mm0606060606060606

S *cepipfoertnec/kcab

mm5252525252525252

T *gepipfoertnec/kcab

mm0404040404040404

U *w;k;e;r;aepipfoertnec/kcab

mm0505050505050505

Installation instructions S-HR series page 6

4 Connecting the unit

The unit has the following connection pipes;

- The central heating pipes, hot and cold water pipes
can be connected to the installation by means of
compression fittings;

- The gas pipe of the unit is provided with a female
thread into which the tail piece of the gas valve can
be screwed;

- The condensation discharge pipe consist of an oval
24 mm plastic pipe. The discharge pipe can be con­nected to this by means of an open connection. If the
open connection is fitted in a different location, then
the pipe can be lengthened by means of a 32 mm
PVC sleeve;

- The flue gas exhaust system and air supply system
consist of 2 x 80 mm connections.

connection diameters table 2

unit pipes bottom figure 2

G A R C E K W

ceiling

wall

minimum
250 mm or
500 mm

tinufoepyt

RH-S

51

RH-S

42

RH-S

T42

RH-S

53

RH-S

T53

RH-S

15

RH-S

T15

RH-S

06

ylppusrianoitsubmoc

mm0808080808080808

tsuahxesageulf

mm0808080808080808

G-epipsag

edisni"½edisni"½edisni"½edisni"½edisni"½edisni"¾edisni"¾edisni"¾

A-epipwolfgnitaehlartnec

mm8282828282535353

R-epipnrutergnitaehlartnec

mm8282828282535353

C-epipegrahcsidnoitasnednoc

mm4242424242424242

E-epiplessevnoisnapxe

mm222222

K-epipretawdloc

mm515151

W-epipretawtoh

mm515151

Installation instructions S-HR series page 7

4.1 Central heating system

The unit pipes can be connected to the installation by
means of compression fittings. Reducers should be
used for connecting to thick-walled pipe (welded or
threaded).
When removing the plastic sealing caps from the pipes,
contaminated testing water can be released.

The unit has a self-adjusting and self-protecting control
system for the load and the pump capacity. By this means
the temperature difference between the supply and return
water is checked. The circulation pump will be able to
supply the given water displacement with an installation
resistance of up to 20 kPa, for this see table 3.

If an unacceptable temperature is detected, then the
control will repeatedly try to achieve water flow, and if
this does not work then the unit will switch off.

The S-HR 60 unit has a circulation pump which has a
residual suction head for the installation of 12 kPa. This
means that the unit can function normally in installations
which have an installation resistance of up to 12 kPa and
in cascade installations.
If the installation resistance is higher than 12 kPa, the
unit will automatically reduce in power.

If the capacity of the unit pump is insufficient, an extra
external pump can be installed in series with the unit.
The electrical side of this external circulation pump can
be connected in the Control Tower, by which means this
pump switches at the same times as the unit pump.
The maximum absorbed current consumption of the
external circulation pump may be 230 W (1 Amp).
Use with a low velocity header can also be selected. In
this case a larger secondary sided water output has to
be taken into account, in order to affect the height of the
water temperature.

If the installation resistance is higher than the stated
value the pump will rotate at maximum pump capacity
and the load will be adjusted until an acceptable
temperature difference between supply and return wa­ter has been obtained. If, after this, the temperature
difference remains too much then the unit will switch
itself off and wait until an acceptable temperature has
arisen.

available water flow at full load table 3

external installation pump in series figure 3

tinufoepyt etarwolfretaw

D C°02T

elbissimrep

ecnatsisernoitallatsni

nim/lh/laPkrabm

51RH-S

9.900653053

T42/42RH-S

1,5108952052

T53/53RH-S

1,22423102002

T15/15RH-S

1,23929102002

06RH-S

9,73172221021

pump index lines graph 1

0 0,5 1 1,5 2 2,5

Q(m³/h)

7

6

5

4

3

2

1

0

H(m)

min (25%)

max (100%)

pump index line ARS 25-75

S-HR 15/24/35

S-HR 24T/35T

S-HR 51T

S-HR 51/60

pump index line ARS 25-70

Installation instructions S-HR series page 8

As standard the unit is provided with a water filter in the
return pipe of the unit. With this, possible contamination
of the central heating water is prevented from ending up
in the unit. The unit is also provided with an internal
safety valve set at 3 bar. This is connected to the
discharge construction to the waste together with the
condensation discharge.

If all, or a large part of the radiators are provided with
thermostatic radiator valves it is advisable to use a
pressure difference control (by pass) in order to prevent
flow problems in the installation.

The unit is designed to be used on sealed
system only.

Additives in the installation water are only
permitted in consultation with STREBEL
LTD.

When using more than one unit in an installation please
refer to the cascade installation instructions.

4.2 Expansion tank

All STREBEL S-HR-T units are provided with an
expansion tank on top of the calorifier. This expansion
tank is connected to the three-way valve and the
circulation pump. By this means the expansion water,
when functioning for the hot water supply, is prevented
from being shut off from the expansion tank when the
radiator thermostat valves are fully closed. A second
expansion tank in the installation is not a problem.

The STREBEL S-HR units are not equipped with an
expansion tank pipe. If a S-HR unit is combined with an
Comfort calorifier, the expansion tank connection is
included in the internal piping of the Comfort calorifier,
to which the expansion tank can be connected. If a
different calorifier is used then one has to take into
account that the expansion tank should be connected
between the three-way valve and the unit circulation
pump.

In connection with correct functioning of the
unit it is necessary for the expansion tank to
be connected to the expansion tank pipe of
the unit.

The expansion tank which is used should be geared to
the water content of the installation. The pre-pressure
depends on the installation height above the mounted
expansion tank.

external installation pump with low velocity header figure 4

choice of expansion tank table 4

evobathgiehnoitallatsni

lessevnoisnapxeeht

ehtfoerusserp-erp
lessevnoisnapxe

m5rab5,0

m01rab0,1

m51rab5,1

Installation instructions S-HR series page 9

The STREBEL S-HR24 and S-HR35 units can be
provided with an expansion tank module. By this means
the external expansion tank is cancelled. This
expansion tank module is placed behind the S-HR unit,
by which means the expansion tank is not noticeable. If
the S-HR unit is provided with a STREBEL Comfort
calorifier the overall depth will be equal. The content of
the two expansion tanks is 20 litres. The pre-pressure is
1 bar.

The expansion tank module can be supplied with the
necessary pipes to connect with the S-HR unit. The
connecting pipes for the installation correspond with
those of the unit and have the same centre-to-centre
distance to the wall. When checking the expansion
tanks these are accessible via the left, right and upper
sides. From these sides the tanks are also removable
and the unit does not have to be dismantled.

The space which is required for mounting the expansion
tank module corresponds with the required space for
mounting a S-HR unit. The included template and
mounting strip for the S-HR unit can be used for the
expansion tank module. The S-HR unit is fitted on to this
after the expansion tank module has been mounted.
The necessary mounting strip for the unit is present on
the module.

expansion tank module figure 5

side view of the module with S-HR unit figure 7
(dimensions in mm)

515

wall

145

370

front view of the expansion tank module figure 6
(dimensions in mm)

480

660105

Article numbers:

- the expansion tank module without pipe connections AEMO209U

- pipe connections for expansion tank module ALE0004U

Installation instructions S-HR series page 10

4.3 Underfloor heating systems

When connecting or using an underfloor heating system
fitted with plastic pipes one has to take into account that
the plastic pipes used meet the DIN 4726/4729
standard. It is stated in this standard that the pipes may
not have a higher oxygen transmittance than 0.1 g/m³.d
at 40°C. If the system does not meet this DIN standard,
then the underfloor heating section will have to be
separated from the central heating unit by means of a
plate heat exchanger.

In case of non-compliance with the
regulations concerning plastic underfloor
heating pipes, no claims can be made against
the guarantee conditions.

4.4 Gas pipe

The unit pipe is equipped with a female thread, into
which the tail piece of the gas valve can be screwed.

The Gas Safety (Installation and Use) Regulations
1994:
It is the law that all gas appliances are installed by
CORGI registered contractors in accordance with the
above regulations. Failure to install appliances correctly
could lead to prosecution. It is in your own interest, and
that of safety, to ensure that the law is complied with.

For good operation of the unit it is necessary that the
pre-pressure of the unit is higher than 20 mbar.

Make sure that the gas pipe work does not
contain dirt, particularly with new pipes.

4.5 Hot water supply (S-HR-T)

The unit pipes can be connected to the installation by
means of compression fittings. The unit is provided with
an inlet combination and safety valve set at 8 bar.
Together with the condensation discharge and the
discharge of the central heating safety valve (3 bar) this
is connected to one waste connection pipe.

A flow regulation valve is fitted in the cold water pipe.
The flow regulation valve provides that a quantity of
water is supplied which has a guaranteed outlet
temperature of 60°C (assuming a cold water
temperature of 10°C). The quantity of water is virtually
unaffected by the water pressure. With a water pressure
lower than 1.5 bar it is advisable to remove the inside
mechanism of the flow regulation valve. Connecting of
the drinking water installation should be done according
to the water BYE-laws.

4.6 Condensation discharge pipe

The collective condensation discharge pipe should be
connected to the waste by means of an open
connection. By this means the possibility of sewer
gases ending up in the unit is prevented. The waste
connection should have a minimum diameter of 25 mm.

The following components are connected to the
collective condensation discharge pipe:

- Condensation discharge;

- Safety valves;

- Inlet combination (S-HR-T)

Discharging of the condensation water to the
precipitation discharge is not permitted in
view of the danger of it freezing.

Before putting the unit into operation fill the
trap with 300 ml of water.

inlet combination and safety valve figure 8

Installation instructions S-HR series page 11

4.7 Flue gas exhaust system and air
supply system

The unit connection diameter is Ø 80 mm. to which the
flue gas discharge and air supply system can be fitted
with or without bends.
The maximum usable pipe length is stated in table 5.

It is advisable to use stainless steel discharge
equipment for the flue gas discharge. By using the
STREBEL icicle-free trough the roof kit, ice-forming
around the flue terminal is prevented. For the air supply
plastic can be chosen. If a plastic discharge system is
installed the unit has to be equipped with a flue gas
thermostat. This flue gas thermostat is available from
STREBEL LTD.

With the flue gas discharge system and air supply
system the following is meant:

- the flue gas discharge pipe;

- the air supply pipe;

- through the roof kit or wall terminal.

The flue gas exhaust and the air supply installation must
be installed in accordance with British Standards.

The exhaust system should always be installed sloping
towards (30 mm/m) the unit, in order for condensation
water not to gather in the exhaust system. With
condensation water flowing back to the apparatus the
chance of ice forming on the trough the roof kit is
minimal. In case of horizontal outlets the supply system
has to be installed sloping outside in order to prevent
rain coming in.

It is superfluous to install an extra condensation
collecting unit.

In operation, the unit produces a white
condensation plume. This condensation
plume is harmless but can be experienced as
disturbing especially in the case of outlets in
the wall. For this reason it is advisable to exit
at roof level.

The apparatus is not suitable as an open
unit. This means that the combustion air
always has to be brought from outside.

Where the unit is installed in a compartment,
ventilation is required as per BS 5440.

For further information regarding the supply range of the
exhaust and supply system please contact STREBEL
LTD.

supply and exhaust system figure 9

length supply and exhaust system table 5

ehthtobrofsisertemnihtgnelepipdetatsmumixamehT
ecnatsidehtsidnametsystsuahxeehtsallewsaylppus

.lanimretllawrofoorehtdnatinuehtneewteb

tinufoepytepipmumixam

htiwsertemnihtgnel

mm08foretemaida

epipmumixam

htiwsertemnihtgnel

mm09foretemaida

51RH-S

0304

T42/42RH-S

5204

T53/53RH-S

8163

T15/15RH-S

0102

06RH-S

631

eht,metsystsuahxeroylppusehtnisdnebgnisunehW

ecnatsiserehthtiwsdnopserrocsiht,wolebdenoitnemhtgnel

.htgnelepipehtotdeddaebotsah,dnebehtfo

dnamm08øtcudtsuahxesertem01htiw42RH-S:elpmaxE

5,21=ertem52,1x2+sertem01:snaemsihT.sdneb°09x2

.ertem

°09dneb

52,15,1

°54dneb

152,1

Installation instructions S-HR series page 12

5 External calorifiers

Various external calorifiers can be connected to a S-HR
unit, depending on the comfort requirements. The
wiring of the calorifier thermostat can be connected to
the connection block in the Control Tower by means of
the relevant plug.
Calorifiers which are used together with the S-HR boiler
should be of the quick recovery type.

S-HR51 and S-HR60
Consult STREBEL when using calorifiers
with lower absorption than 20kW or primary
pipe and/or coil size less than 3/4 inch.

S-HR with calorifier figure 14

6 Electrical connection

The unit complies with the CE machine guidelines 89/
392/EEC.

The installation must be in accordance with:

- Current I.E.E. Regulations;

- Local Regulations;

- A visible electrical isolation switch must be fitted
adjacent to the boiler complete with an earth.

The apparatus complies with the following regulations:

- low-voltage guideline 73/23/EEC

- EMC guideline 89/336/EEC

Furthermore the following general regulations are valid:

- no modifications may be made to the wiring of the
unit;

- all connections must be made to the connection
block.

The Brain room thermostat and controls must be
connected to their allocated connections. All other types
or makes of room thermostats or controls which are
used must have a potential-free contact

When using an on/off thermostat or control, it is possible
that an anticipating resistance must be installed in order
to prevent too high temperature fluctuations. As a stand­ard rule this means mercury thermostats. This resis­tance wire is present in the Control Tower and must be
connected to clamps 23 and 27. The anticipating resis­tance in the room thermostat has to be set at 0.11 A.

For more detailed questions regarding the components
which are not supplied by STREBEL, the supplier
concerned should be contacted.

The connections of the Brain Interface and
the wiring of the three-way valve with the
calorifier sensor are only applicable if they
are installed in the Control Tower.

230 Volts for

external pump

mains power

supply

230 Volts for

external control

230 Volts

internal or external

three-way valve motor

and calorifier sensor

Brain

clock thermostat

On/off thermostat or

control

Connection block in the Control Tower

STREBEL outside

sensor

External safety

contact

24 Volts

maximum 100 mA

Installation instructions S-HR series page 13

electrical connecting diagram figure 11

Installation instructions S-HR series page 14

7 Control of the unit

The unit is provided with a self-adjusting control called
the Control Tower. This control takes over a large part
of the manual adjustments which means putting the unit
into operation has been extensively simplified. After
plugging the plug into the wall socket the unit will not
undertake any operating action and no operating lamps
will be lit.

On the display the relevant status will be shown. Rea­ding out of the status can be done in two ways.

The first way is a simple read out called the Good status.
The unit will only show the indication. During this
read out the unit can be in normal operation without this
showing in any other way. If it is necessary to show a
report it will be shown on the display.

The second way is the technical way which shows a
more extensive read-out with, among others, the
position in which the unit is active with the flow water
temperature and the water pressure of the central
heating system.
The second level is reached from the indication
after pressing the STEP key for 5 seconds. Returning to
the indication is done the same way.

Only when activating the operating program pump
circulating after filling up the installation, will the
automatic venting program start as standard after

pressing the PC program key. This automatic
venting program takes 15 minutes and stops

automatically. After this the unit will function for the
activated part.

In case of a heat requirement, which arises for central
heating or hot water, a certain flow water temperature
will be calculated. This calculated water temperature is
called the T-set value. This value becomes active in
case of a demanding room thermostat after which the
unit power will be adjusted. With a recently started unit
a build-up delay of the T-set valve is active. The main
purpose of this is to prevent the unit going into operation
at full power due to which disturbing noises and
unnecessary temperature peaks can arise. In the case
of heat requirement from the hot water supply the T-set
valve on the central heating return water temperature is
adjusted. Depending on the amount of domestic water
which is withdrawn from the calorifier, the central
heating return water temperature, which adjusts the
load of the unit, will vary.

Each time the mains power supply to the
boiler is broken, the automatic venting pro­gram will re-start once there is power to the
boiler.

7.1 Explanation of the function keys

Key functions from the and the extensive
indication are:

-

Central Heating program key, see chapter

10.1;

- Hot Water program key, see chapter 10.2;

- PC program key, adjusts the pump to continuous
water circulation in the central heating system, or

according to the pump overrun times on the relevant
programs;

- Mode key, after briefly pressing, a selection of the
data chapters can be retrieved. After pressing for 5
seconds it is possible to enter the code as described
in chapter 10.3;

- Step key, after briefly pressing, the water pressure
can be retrieved and pages per chapter can be
retrieved. After pressing for 5 seconds it switches
from indication to technical indication and the
other way round;

- Reset key, after briefly pressing, for:
unlocking errors;
ending the access code;
ending the automatic venting program, only when
the access code is entered and the reset key is
pressed briefly.
After pressing for 5 seconds an operating stop is
made, for example, for activating the automatic
venting program.

Other key functions from the other indications are:

- Central Heating key then has the + function;

- Hot Water key then has the - function;

- PC key then has the store function, which means
that by means of this key a modified setting is

confirmed;

- Step key for scrolling in a data chapter.

Installation instructions S-HR series page 15

8 Filling and venting of unit and

installation

Filling of the installation can be carried out according to
the usual method. In order to read out the central
heating water pressure the unit plug should be plugged
into the socket.
The circulation pump will not begin to operate as long as
the operating lamps are off. The control display will
show a indication, which means that the control
is signalling insufficient water pressure. If the
installation is filled and the water pressure rises then the
water pressure will automatically be shown with an
alternating text. If the water pressure rises to
above 1.5 bar then after a short stop text the
indication will appear, which means the water pressure
is sufficient and the unit is ready for operation.
In order to be able to read out a constant water pressure
the Step key should be pressed in and in order to obtain
a constant readout the Step key should be
pressed briefly again.

If the water pressure in the unit becomes too high (>3.5
bar) a text appears, by which means the burner
is switched off. After draining the water from the
installation, by which means the water pressure arrives
below 3 bar, the text disappears and the burner
is activated.

In order to go from a read-out to a technical

readout the Step key should be pressed for 5
seconds. This read-out can be selected if the user
requires a technical read out. In order to return to the

read-out the Step key must be pressed again for
5 seconds.

8.1 Central heating system

For filling the central heating installation you use the
filling and draining valve.

Filling is done as follows:

- Plug the unit plug into the wall socket and leave the

operating lamps off;

- Connect the filling hose to the cold water tap and let

it fill with water;

- Connect the filled filling hose to the filling and

draining valve and open this valve;

- Open the cold water tap and fill the installation

slowly;

- The unit has an automatic vent which removes the

air which is present;

- Start venting the radiators and pipes at the lowest

point;

- Bring the installation to pressure (1.5 to 2 bar) after

all radiators and pipes have been vented;

- Close the cold water tap and the filling and draining

valve;

- Activate the automatic venting program by pressing
the pump key which means the pump lamp will be
lit. Allow the control to finish its venting program. The

pump will circulate a number of times around the
boiler as well as the central heating installation.
Also, if a three-way valve, if present, this will be
adjusted to the boiler and central heating installation
a number of times. The pump will be stopped
regularly in order to allow possible present air to
escape.

- Check the water pressure and if required top up. The
working pressure in the installation should be bet­ween 1.5 and 2 bar in cold state.

- After finishing the automatic venting program the key

can be switched off again.

It can take a while before all air has dis­appeared from a filled installation. Especially
in the first week noises can be heard which
indicate the presence of air. The automatic air
vent in the unit will make this air disappear, by
which means the water pressure can reduce
during this period and therefore topping up
with water will have to be done.

8.2 Hot water supply

Apply the water pipe pressure to the calorifier (open
main valve and/or stop valve of the inlet combination
valve).

Vent the calorifier and the hot water installation by
opening a hot water tap. Leave the tap open for as long
as required until all air has disappeared from the
calorifier and the pipes and only water is flowing from the
tap.

Installation instructions S-HR series page 16

9 Putting the unit into operation

Before putting the unit into operation make sure, that the
unit and the installation are well vented. Vent the gas
pipe and open the gas valve for the unit. The unit does
not require adjustment of burner pressure and air
quantity because it is self-adjusting and is factory-set at
the correct value.

9.1 Central Heating system

Provided there is a heat requirement from the
thermostat or control, the central heating program will

be put into operation by means of the

key (central

heating program). The circulation pump will start
circulating and the unit will start the burner.

9.2 Hot water supply

Provided there is a heat requirement from the boiler the
hot water program will be put into operation by means of

the key (hot water program).

9.3 Adjustments

In the Control Tower a number of adjustments can be
made. These adjustments can be fed in easily by means
of the keys on the unit. However, a distinction is made
between adjustments which are done by the user and
adjustments done by the installer.
At users level adjustments can only be made from the
technical read-out in other words from the display read­out with the operating function and the water
temperature. Adjustments can not be made from the

indication.

The next two chapters are accessible after pressing the
Mode key:

Chapter 1
The normal operating functions such as the simple

read out or the technical with the

read out.

Chapter 2
The chapter in which adjustments can be made.

Installation instructions S-HR series page 17

User adjustments
To switch from the

level to the opera-ting
status level with the read out of the operating
functions , the water tempe-rature and
the water pressure , the following acts
must be carried out. From the display read-out,
press the Step key for 5 seconds after which the
operating status and the water temperature will
be shown for 8 seconds and the water pressure
for 2 seconds. If, after this, the Mode key is
pressed briefly the adjustments chapter is
displayed by means of the text . By
pressing the Step key briefly the adjustment
facilities are shown. Adjustment of the fixed
value can be done by means of the + or the -
key. Confirmation of the new setting is done with
the Store key.

* Brain thermostat
Most of the adjustments which are stated in
tables 6 and 7 are unnecessary when in
combination with the Brain and will be taken
care of by the Brain itself and do not have to
be adjusted. Most of the data in table 8 can be
requested by the Brain. For further
information with regard to the Brain
thermostat we refer to the Brain thermostat
installation manual.

In order to gain access to the adjustments at
installers level the entrance code has to be fed
in first. For this the following operations have to
be carried out.

Press the Mode key for 5 seconds. The text

is shown, after which a random number

appears on the display. By means of the + or the

- key the code can be fed in. After
pressing the Store key the code is confirmed.
With this entrance to the installers level is given.

The next chapters are shown after pressing the
Mode key:

Chapter 3
The chapter where information can be retrieved.

Chapter 4
The chapter in which adjustments can be made
for service purposes.

Chapter 5
The chapter in which error data can be retrieved.

user adjustment possibilities table 6

stnemtsujdaretemarapresU

petS noitpircsed yrotcaf egnar

1

gnitaehlartnec.pmetretawwolfmumixamC°58C°09-02

2

metsysgnitaehlartnecfoepyt104-1

10

srotcevnoc;gnitaehria;srotaidar

retawwolfxamTC°58.motua

enilgnitaehrotcafK3.2.motua

tneidargnim/C°5.motua

laitnereffidraegC°6.motua

20

lanoitiddasagnitaehroolfrednurosaeraecafrusegralhtiwsrotaidar

gnitaeh

retawwolfxamTC°07.motua

enilgnitaehrotcafK8.1.motua

tneidargnim/C°5.motua

laitnereffidraegC°5.motua

30

gnitaehlanoitiddasasrotaidarhtiwgnitaehroolfrednu

retawwolfxamTC°06.motua

enilgnitaehrotcafK5.1.motua

tneidargnim/C°4.motua

laitnereffidraegC°4.motua

40

gnitaehroolfrednulluf

retawwolfxamTC°05.motua

enilgnitaehrotcafK0.1.motua

tneidargnim/C°3.motua

laitnereffidraegC°3.motua

*01

erutarepmetyadenilgnitaehtnemtsujdaenif05tot5-

*11

erutarepmetthginenilgnitaehtnemtsujdaenif05tot5-

32

erutarepmetytefastsorfC°3-C°01tot02-

13

rednilyclanoitiddafoerutarepmetffo-hctiws

reliobRH-Shtiw

C°36C°08-04

84

)06/15RH-S(yticapacpmupmuminim)%05(%52%001-52

Installation instructions S-HR series page 18

Installers adjustments
Adjustments whereby technical knowledge is
required have been classified under the installers
level. Access to this level is obtained after feeding
in a code, after which adjustments for user and
installer are visible. For going to the Adjustments
Parameters chapter the Mode key should be

pressed once after which it is shown with the
text. Scrolling in the Parameter chapter can be done
by means of the Step key. Adjusting the fixed value
can be done by means of the + or the - key.
Confirming the new adjustment is done with the
Store key.

Information chapter.
After feeding in the access code the information
can be read out according to table 8. In order to
select the information chapter the Mode key must
be pressed twice after feeding in the code. New
adjustments can not be done in this chapter.
Scrawling in the information chapter is possible by
means of the Step key.

installer adjustment possibilities table 7

rellatsnistnemtsujdaretemarapartxE

petS noitpircsed yrotcaf egnar

3

Wknignitaehlartnecrewopxammumixamxam-nim

*4

elpicnirplortnoc

tatsomrehtffo/nohtiw

01-0

0

tatsomrehtffo/no%001

1

tnednepedrehtaewffo/no%001

*5

rotcafKenilgnitaeh3.25.3-2.0

*6

tnenopxeenilgnitaeh4.14.1-1.1

*7

enozetamilcenilgnitaeh01-0-02-

*41

deepstneidarg751-0

*51

noitcuderthginretfaretsoob01fo0

0

on

1

sey

63

evlavyaw-eerhtfoepyt03-0

0

0102CV

1

gnitaludom0496CV

34

Wkniretawtohrewoprewopxammumixamxam-nim

94

yticapacpmupxam

gnitaehlartnec

%001%001-04

98

ecafretnignittessserdda07-1-

1-

eraps

0

niarB

7-0

edacsaCni8-1reliob

installer information possibilities table 8

rellatsniedomnoitamrofnI

petS noitpircsed eulav

1

1TerutarepmetretawwolfC°

4

2TerutarepmetretawnruterC°

5

3TerutarepmetretawreifirolacC°

7

4TerutarepmetedistuoC°

8

5TerutarepmetsageulfC°

61

%nirewoptneserp%

71

WknirewoptneserpWk

81

WknidaoltneserpWk

02

noitacinummocsublortnoc

12

latotnoitpmusnocJGJG

22

gnitaehlartnecnoitpmusnocJGJG

32

retawtohnoitpmusnocJGJG

42

sruohnurrenrubforebmunlatotruoh

52

gnitaehlartnecsruohnurrenrubforebmunruoh

62

retawtohsruohnurrenrubforebmunruoh

23

retnuocsruohforebmunlatotruoh

64

deriuqerecivressisruohynamwohnihtiwruoh

Installation instructions S-HR series page 19

Service chapter.
After the access code has been fed in it is possible to
temporarily manually adjust the number of revolutions
of the fan in the service chapter (table 9). In order to
select the service chapter the Mode key has to be
pressed 3 X after feeding in the access code. By means
of the Step key the first function is displayed with the text
Off. By means of the + or - key a required number of
revolutions for the fan can be selected while the unit is
operating.
With Step 4 it is possible to activate the showroom
position by pressing the + key after which the text on
appears in the display.
After this a simulated water pressure of 1.9 bar and a
water temperature will be indicated. Pump or burner
action is not possible. After a voltage interruption or a
reset the showroom position is switched off.

Error chapter.
After the access code has been fed in the Error chapter
can be read (table 10). In order to select the Error
chapter it is necessary to press the Mode key 4 X after
feeding in the access code. By means of the Step key
the functions are shown which were stored when the
unit went into an error state. The first error which is
shown is the last, the next error is the second last, etc.

In order to return to the normal technical read out
whereby the water temperature and water pressure are
shown, the Standby chapter must be requested by
means of the Mode key. After a few seconds the text
standby will be replaced by the technical read-out.
Other wise returning to the Good read-out
automatically occurs after 20 minutes in the event that
no more keys have been used.

Green key function
The green key function can be used in order to activate
the factory settings. By this means the modified settings
are cancelled. The following actions must be carried

out. Make sure that chapter is shown in the
display by means of the Mode key. After this press the
Store key. The word Copy becomes visible and the
factory settings will be active again.

installer service possibilities table 9

installer error possibilities table 10

rellatsniedomrorrE

petS noitpircsed eulav

1

rebmunrorre

2

tinusutatsgnitarepo

3

1TerutarepmetretawwolfC°

4

2TerutarepmetretawnruterC°

5

daolWk

6

yticapacpmup%

rellatsniedomecivreS

petS noitpircsed

1

nonoitcnufrenrubhtiwnoitareponireliob

2

fforenrubdnaelbatsujdanaf

3

norenrubhtiwelbatsujdapmup

4

evitcanon=FFOdnaevitca=NOnoitisopmoorwohs

Installation instructions S-HR series page 20

10 Switching off the unit

In some situations it may be that the entire unit must be
switched off. By switching off the three keys with the
lamps for central heating, hot water and pump program,
the unit is switched off. STREBEL advise to leave the
plug in the wall socket, by which means the circulation
pump and the three-way valve are activated once every
24 hours in order to prevent jamming.

In the event of frost danger it is advisable to
drain the unit and/or the installation.

11 Commissioning and

maintenance

The top of the casing is hooked behind a locking edge
and is locked behind the door on the front of the casing
with a screw. After removing this screw the casing must
be lifted at the bottom by which means it is released from
the locking edge. Then the casing can be removed
forward.

With the S-HR settings such as burner pressure and
adjustment of the air quantity are unnecessary, due to
the fact that the unit operates with a so-called zero
pressure control. By this means the correct gas quantity
is controlled by the suction operation of the fan. The fine
adjustment which is carried out at the factory is once­only, which means that adjusting of these values is
unnecessary.

11.1 Checking for contamination

In order to be able to check the unit for contamination in
the following running years it is advisable to measure
the maximum air displacement in the unit when putting
the unit into operation. This value can be different with
each type of unit.

In order to be able to measure this value the following
operations must be carried out:

- in order to enter the service chapter feed in the
access code as described on page 18;

- select the manual fan setting without burner action
Step , by means of the Step key which will
indicate that the fan is off ;

- connect the digital pressure gauge hose to the
uppermost measuring nipple of the gas block
according to figure 12 (open it before fitting the
hose);

- take the fan to its maximum number of revolutions by
means of the + key;

- measure the pressure difference and write down this
value;

- when next servicing the unit the value of the fan
output may not have reduced by more that 20%
compared to the value during commissioning. If this
value is lower than 20% the unit does not require
maintenance.

11.2 Checking of the zero pressure control

The zero pressure control is set at the factory. This can
be checked by means of the following action;

- make sure that the unit is in operation and that it can
discharge the heat which it produces;

- in order to enter the service chapter feed in the
access code as described on page 18;

- select the manual fan adjustment with burner action
Step by means of the Step key, which will
indicate that the manual operation is off ;

measuring point air pressure difference figure 12

Installation instructions S-HR series page 21

- connect the digital pressure gauge hose to the
uppermost measuring nipple of the gas block
according to figure 13;

- activate the manual control by briefly pressing the
- key;

- take the fan to minimum load by means of the - key,
after which the measured pressure difference must
be between 0 and -4 Pa ;

- ending the manual selection is done by pressing the
- key until the minimum load is displayed. After

pressing this key again the text

is shown

which means that the manual selection is off.

If it is determined that the zero pressure control deviates
too much, then it can be corrected by means of the
adjustment screw on the gas block.

- place the lance of the CO

2

gauge in the location

according to figure 14;

- adjust to maximum load by means of the + key;

- ending the manual selection is done by pressing the
- key until the minimum load is shown. After

pressing this key again the text

is shown

which means that the selection is off.

11.3 Checking the CO

2

The CO2 percentage is factory-set. This can be checked
by means of the following actions:

- put the unit into operation by means of the service
chapter as described in chapter 11.2;

- adjust the CO2 percentage according to table 11.
The CO2 percentage can be adjusted by means of
the adjustment screw according to figure 15.

adjustment screw zero pressure control figure 13

measuring point for CO

2

figure 14

adjustment screw CO

2

figure 15

Installation instructions S-HR series page 22

11.4 Maintenance

If it is necessary to clean the unit the following actions to
the following components must be carried out:

The air unit
Dirt which is sucked in by the air supply pipe will end up
in the bottom of the air box. This dirt can be cleaned with
a cloth with a simple (non-abrasive) cleaning agent.

Do not use an abrasive agent for cleaning,
this causes disturbing scratches in the air
box.

The burner ceramic bricks and heat exchanger
These components should only be cleaned if it is
determined that the maximum Pa is no longer obtained
as described in chapter 12.1.

The fan unit must be removed in order to be able to
inspect the heat exchanger. In this case the following
actions must be carried out:

- close the gas valve and isolate the units electrical
supply;

- turn the Control Tower forward around its left hinge
point and remove the plastic air box;

- loosen the nut of the gas pipe under the gas block;

- loosen the small crosshead screw on the red
electrical connection adaptor of the gas block;

- remove the electrical connection plug from the fan
motor;

- loosen the front crosshead screw of the black plastic
air inlet damper;

- after this turn the two clamping rods ¼ turn and
remove them by pulling them forward;

- slightly lift the fan unit and remove it towards the front
of the heat exchanger;

- the fan unit and the air inlet damper can be checked
for contamination and if necessary cleaned;

- now remove the burner ceramic bricks by slightly
lifting them upward and removing them in the same
direction as the heat exchanger fan unit;

- the burner ceramic bricks and the heat exchanger
can be cleaned by means of a soft brush;

Refitting of the components is done in reverse.

The following components require extra attention
before and after refitting:

- make sure that the gasket for the ceramic bricks is
fitted onto the heat exchanger precisely;

- make sure that the fan unit clamping rods have been
pushed backward sufficiently and that they have
again been turned ¼ turn;

- make sure that the gas connection under the gas
block is tightened;

The waste trap
In order to check the waste trap for contamination the
following actions must be carried out:

- make sure that the unit is off by isolating the units
electrical supply;

- turn the Control Tower forward around its left hinge
point;

- turn the waste trap cup to the left until it is released
from the screw thread;

Do not use pliers or wrenches for removing
the waste trap cup

Refitting is done in reverse order.

11.5 Further checks

Checking the ionisation current.

- ionisation determines if there is a flame present with
correct combustion. The measurement is done by
means of connecting a Micro ampere gauge in
series with the ionisation thread. The minimum
allowed ionisation is 2 µA. The unit will modify its load
anyway if the ionisation reaches the bottom limit of 2
µA.

Checking by means of a visual inspection.

- A visual inspection entails viewing and checking of a
number of components with regard to their
functioning.
The safety valve may not show any traces of leaks.
The waste trap should be clean.
The central heating water filter only requires
cleaning if the circulation pump is adjusted at maxi­mum speed and the maximum DT is exceeded.

11.6 The frequency of maintenance

STREBEL advise to carry out an inspection to the unit
every two years and an overhaul every four years. When
doing this the circumstances of the units location must
be taken into account, From this one can determine
whether to deviate from this advice.

Installation instructions S-HR series page 23

12 Technical specifications

unit specifications table 11

epytecnailppa

RH-S

51

RH-S

42

RH-S

T42

RH-S

53

RH-S

T53

RH-S

15

RH-S

T15

RH-S

06

)sH(tupni

Wk0,510,420,420,530,530,150,150,06

)iH(tupni

Wk5,316,126,125,135,139,549,540,45

)C°06/08yticapac(egnarnoitaludom

Wk3,31-5,32,12-5,32,12-5,39,03-9,49,03-9,40,54-8,80,54-8,89,25-8,8

)C°03/05yticapac(egnarnoitaludom

Wk4,41-9,30,32-9,30,32-9,36,33-3,56,33-3,59,44-5,99,44-5,92,75-5,9

)daollluftaC°06/08(ycneiciffe

%8989898989898989

)daollluftaC°03/05(ycneiciffe

%701701701701701601601601

776NEhtiwecnadroccaniycneiciffe

%901901901901901901901901

xONfonoissimeylraey

mpp2121212121212121

OCfonoissimeylraey

mpp1111111111111111

OC

2

%99999 5,95,95,9

)daollluftaC°06/08ta(erutarepmetsageulf

C°5656567676868686

)daolwoltaC°03/05ta(erutarepmetsageulf

C°1313131313131313

lortnocrenrub

noitaludomsselpets

02G)C°0/rabm3101ta(noitpmusnocsag

h/³m23,101,201,270,370,374,474,462,5

epytrenrub

cimareccimarecmaof

epyttnerruc

zH/V05/03205/03205/03205/03205/03205/03205/03205/032

dedrocerrewopcirtcelemumixam

W221221221541541091091091

dedrocerrewopcirtceleybdnats

W55555555

92506NEotgnidroccanoitcetorpfoeerged

04PI04PI04PI04PI04PI04PI04PI04PI

)ten(thgiew

gk0505373567366836

desab-HCyticapacretaw

l5,35,35,3 55777

desab-WHDyticapacretaw

l414131

HCemitnurrevopmup

nim5151515151515151

WHDemitnurrevopmup

nim 111

muminimerusserpretaw

rab11111111

mumixamerusserpretaw

rab33333333

erutarepmetretawwolfmumixam

C°0909090909090909

C°06taetarwolfpat

nim/l65,85,21

C°54taetarwolfpat

nim/l5,85,215,71

epytpmup

oliW

SRA

07/52

SRA

07/52

SRA

07/52

SRA

07/52

SRA

07/52

SRA

57/52

SRA

57/52

SRA

57/52

daehpmupelbaliava

aPk5352520202020221

tnetnoclessevnoisnapxe

l2121

erusserp-erplessevnoisnapxe

rab11

Installation instructions S-HR series page 24

G gas pipe
A flow connection central heating
R return connection central heating
C condensation pipe
E expansion tank pipe (S-HR-T)
K cold water pipe (S-HR-T)
W hot water pipe (S-HR-T)

T1 flow sensor
T2 return sensor
T3 calorifier sensor HWS (S-HR-T)
T5 flue gas sensor (if fitted)

P1 water pressure sensor

13 Diagram showing various parts of the unit

unit diagram figure 16

GAR CE KW

T1

T2

P1

10

11

12

13

2

1

8

14

4

5

3

T5

6

7

18

T3

16

15

9

17

Installation instructions S-HR series page 25

P1 4T12 13195187 6 T3920

T2 C 11 E K13 14 15 16 17WG21 A10 RT5

1 heat exchanger
2 ignition unit
3 fan unit
4 air inlet damper
5 gas block
6 safety valve
7 automatic air vent
8 ceramic burner bricks
9 calorifier HWS (S-HR-T)
10 operating panel

unit description figure 17

11 Control Tower
12 water filter return central heating
13 three-way valve (S-HR-T)
14 circulation pump
15 inlet combination valve (S-HR-T)
16 safety valve (S-HR-T)
17 thermostatic mixing valve (S-HR-T)
18 flue gas discharge
19 combustion air supply
20 air unit
21 type plate

Installation instructions S-HR series page 26

1 STREBEL S-HR unit
2 expansion tank
3 outside sensor ARV1205U
4 drain points
5 Brain thermostat AA1RT15G

14 Example diagrams for connecting the unit

14.1 Radiator installation without thermostat valves

connecting of the unit to a radiator installation without thermostat valves figure 18

1

2

3

4

5

Installation instructions S-HR series page 27

1 STREBEL S-HR unit
2 expansion tank
3 outside sensor ARV1205U
4 drain points
5 Brain thermostat AA1RT15G
6 by-pass

tra thermostatic radiator valve

14.2 radiator installation with thermostat valves only

connecting of the unit to a radiator installation with thermostat valves only figure 19

1

2

3

4

5

6

Installation instructions S-HR series page 28

14.3 radiator installation with an under floor heating zone

connecting of the unit to a radiator zone and an underfloor heating zone figure 20

1

2

3

4

5

6

7

8

9

10

11

12

13

1 STREBEL SUPER HR unit
2 expansion tank
3 outside sensor ARV1205U
4 drain points
5 Brain thermostat AA1RT15G
6 underfloor heating
7 2-core sleeve cable
8 zone controller AA1RR15G
9 zone three-way valve
10 zone pump
11 zone non return valve
12 zone flow sensor
13 adjustment valve

Installation instructions S-HR series page 29

14.4 radiator installation and an independent underfloor heating zone

connecting of the unit to a radiator installation and an independently controlled underfloor heating zone figure 21

1

2

3

4

5

6

7

8

9

10

11

12

14

13

1 STREBEL S-HR unit
2 expansion tank
3 outside sensor ARV1205U
4 drain points
5 Brain thermostat Master AA1RT15G
6 underfloor heating
7 2-core sleeve cable
8 group controller AA1RR15G
9 three-way valve group controller
10 pump group controller
11 return valve group controller
12 flow sensor group controller
13 adjustment valve
14 Brain thermostat zone controller AA1RT15G

Installation instructions S-HR series page 30

14.5 two independent radiator zones

connecting of the unit to two independently controlled radiator zones figure 22

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1 STREBEL S-HR unit
2 expansion tank
3 outside sensor ARV1205U
4 draining possibility
5 Brain thermostat Master AA1RT15G
6 2-core sleeve cable
7 group controller AA1RR15G
8 three-way valve group controller
9 pump group controller
10 return valve group controller
11 flow sensor group controller
12 Brain thermostat group AA1RT15G
13 adjustment valve
14 low velocity header

Installation instructions S-HR series page 31

15 Error indication

A detected error is indicated on the display by means of blocking or error messages. A distinction should be made
between these two messages due to the fact that blocking can be of a temporary nature, however, error messages
are fixed lockings. The control will try its utmost to prevent locking and will temporarily switch off the unit by blocking
it. Hereunder is a list of some messages.

Blocks with a number in the last 2 positions.

Block 01:

External safety contact cut off

Block 11:

Maximum DT of flow and return sensor in central heating has repeatedly been exceeded. During the
block normal operation of the hot water supply is possible. The pump continues to operate at minimum
capacity during the block.

Block 12:

Maximum DT of flow and return sensor in domestic hot water has repeatedly been exceeded. During
the block normal operation of the central heating installation is possible. During the block the pump
continues to operate at minimum capacity.

Block 60:

Incorrect parameter setting of the minimum or maximum power.

Block 67:

A DT has been detected between flow and return sensor whereas the burner is not in operation. After
the DT has disappeared the block will disappear.

Block 80:

Maximum flue gas temperature has been exceeded (if present). The block will not be cancelled until
the flue gas temperature has arrived below the temperature.

Block 81:

The flue gas sensor is not connected although it was connected to the control. The burner is blocked
until the flue gas sensor is reconnected.

Block 82:

The flue gas sensor has short-circuited, heat requirement blocked and pump capacity at minimum.

Block 85:

The control has not detected a water flow. The venting cycle is started. If during this cycle water flow
is detected, the venting cycle is ended and the burner is released.

Error with a number in the last two positions.

Error 00: Poor flame-forming
Error 01: short-circuit of 24 volt circuit

Error 02: no flame-forming
Error 04: adjustment or error for voltage interruption

Error 05: adjustment
Error 12: fuse 24 volt/3AT faulty
Error 18: maximum flow temperature exceeded

Error 19: maximum return temperature exceeded
Error 28: number of revolutions not reported back from fan

Error 69: no or incorrect display
Error 80: maximum flue gas sensor temperature exceeded

This renewed publication cancels all previous installation instructions.

The company reserves the right to change the specifications and dimensions without prior notice

E. & O. E.

central
heating
progr. on / off

hot water
progr.
on / off

pump progr.
on / off

Reset key

Step key

display

Explanations of symbols and signs on the
Control Tower display.

0
1
2

No heat requirement
Ventilation phase
Ignition phase
Burner active on central heating
Burner active on hot water
Fan check
Burner off when room thermostat is demanding
Pump overrun phase for central heating
Pump overrun phase for hot water
Burner off because of too high flow water temperature
Automatic venting programme

3
4
5

6
7
8
9
A

Water pressure is too low (<1,0 bar), flashing FILL will be
altered with indication of water pressure, unit power of 50% is
possible. The installation needs to be topped up.

Water pressure is too low (<0,7 bar), FILL indication remains
continuously visible, the unit is taken out of operation. The
installation needs to be topped up.

Water pressure is too high (>3,5 bar), HIGH indication remains
continuously visible, the unit is taken out of operation. The
installation pressure needs to be decreased by draining water.

Operation indication (in the first display position)

Mode key ~ Selecting chapters

Step key ~ Scrolling in a chapter

Reset key ~ Unlocking the unit in case of error

Mode key

STREBEL LTD.
1F, Albany park industrial estate
frimley road, camberley
surrey GU15 2PL
Telephone: [phone]
Fax: [phone]