Drayton SHR 521 20 User manual
Thank you for buying a Drayton product.
Please read this manual carefully to get the best perfomance from this unit.
Drayton SHR 521 20
Installation
Commissioning
Operation
Fault finding
Examples
SHR 521 20
manual
B
49000720
*49000720*
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Contents
Disclaimer ............................................................................2
Safety Regulations ...............................................................2
Technical data and function ...............................................3
1. Installation .............................................................5
1.1 Mounting .................................................................................. 5
1.2 Electrical wiring ...................................................................... 5
1.2.1 Standard solar system ........................................................... 6
1.2.2 Solar system and back-up heating ...................................... 6
2. Operation and function ........................................7
2.1 Adjustment buttons .............................................................. 7
2.2 System-screen display ........................................................... 7
2.2.1 Channel indication ................................................................. 7
2.2.2 Tool bar .................................................................................... 7
2.2.3 System screen ......................................................................... 8
2.3 Flashing symbols ..................................................................... 8
2.3.1 System-Screen flashing symbols ......................................... 8
2.3.2 Flashing symbols ..................................................................... 8
3. Commissioning ......................................................9
4. Control parameter and indication channels ... 10
4.1 Channel overview ................................................................ 10
4.1.1-6 Indication channels ..............................................................11
4.1.7-17 Adjustment channels ........................................................... 12
5. Tips for fault finding ........................................... 17
5.1 Miscellaneous ........................................................................18
6. Accessories ......................................................... 20
Security advice
Please pay attention to the following security advice in order
to avoid danger and damage to people and property.
Instructions
Attention should be paid
- to the statutory provisions for prevention of industrial
accidents,
- to the statutory provisions for environmental protection,
- to the Health and Safety at Work Act 1974
- to Part P of the Building Regulations 2005
- to BS7671 Requirements for electrical installations and
relevant safety regulations of DIN, EN, DVGW, TRGI, TRF
and VDE.
This instruction is exclusively addressed to authorised
skilled personnel.
- Only qualified electricians should carry out electrical
works.
- Initial installation should be effected by named qualified
personnel
Declaration of conformity
We, Invensys Controls Europe, declare under our sole re-
sponsibility that our product SHR 52120 complies with the
following standards:
EN 55 014-1
EN 60 730-1
According to the regulations of the above directives, the
product is labelled with :
89/336/EWG
73/ 23/EWG
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!
• Backlit multifunction display
to monitor solar thermal sys-
tems
• Up to 4 Pt1000 temperature
sensors
• Heat balancing
• Stylish, easy-to-install housing
• Simple 3-button operation
• Solar operating hours counter
and thermostat function
Technical data
Housing:
plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Ambient temp.: 0 ... 40 °C
Size: 172 x 110 x 46 mm
Mounting: wall mounting, panels
mounting is possible
Display: System screen for sys-
tem visualisation, 16-segment display,
7-segment display, 8 symbols for system
status and operating control lamp
Operation: by 3 pushbuttons on the
front of the housing
Functions: Temperature differential
controller with optional system func-
tions. System monitoring according
to BAW-guidelines, operating hours
counter for solar pump, tube collector
special function, as well as heat quan-
tity balancing.
Inputs: for 4 Pt1000 temperature
sensors
Outputs: depending on version, see
section „controller versions“
Power supply:
220 ... 240 V~
Switching Capacity:
4 (2) A 220 ... 240 V~
Mode of operation:
Typ 1.b
Breaking capacity per relay:
electromechanical relay:
4 (2) A 220 ... 240 V~
Parts included:
1 x SHR 521 20
1 x accessory bag
1 x spare fuse T4A
2 x screws and wall plugs
4 x cable clamps and screws
Additionally enclosed in the full kit:
1 x sensor FKP6
1 x sensor FRP6
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Examples SHR 521 20
Please find detailed con-
nection diagramms for
these systems in chap-
ter 1.
Standard solar systems Solar systems with
dual-mode DHW cylinder
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display
pushbuttons
can fuse 4A
cable conduits in the clamps
cover
1.1 Mounting
The unit must only be located indoors. It is not suitable
for installation in hazardous locations and should not be
sited near to any electromagnetic field. The controller must
additionally be equipped with an all-polar gap of at least 3 mm
or with a gap according to the relevant installaton regulations,
e.g. LS-switches or fuses. Please ensure that sensor cables
and AC power cables are kept well apart.
1. Unscrew the cross-head screw of the cover and remove
it from the housing.
2. Mark the upper fastening point on the wall and insert the
enclosed wall plug and screw.
3. Hang the housing at the upper fastening point and mark
the lower fastening point on the wall (hole pitch 130 mm),
afterwards put the lower wall plug.
4. Fix the housing on the wall.
1. Installation Warning!
Switch-off mains supply before
opening the housing.
1.2 Electrical wiring The power supply to the controller must only be made by
an external mains switch (last step of installation!) and the
mains voltage must be 220 ... 240 Volt (50...60 Hz). Flexible
lines are to be fixed at the housing by enclosed cable clamps
and screws.
The controller is equipped with 2 relays to which the out-
puts e.g. pumps, valves etc. can be connected:
• Relay 1
18 = line R1
17 = neutral N
13 = earth terminal
• Relay 2
16 = line R2
15 = neutral N
14 = earth terminal
The temperature sensors (S1 up to S4) will be connected
to the following terminals regardless of polarity:
1 / 2 = Sensor 1 (e.g. Sensor collector 1)
3 / 4 = Sensor 2 (e.g. Sensor store 1)
5 / 6 = Sensor 3 (e.g. Sensor TSPO)
7 / 8 = Sensor 4 (e.g. Sensor TRL)
The power supply is connected to the terminals:
19 = neutral N
20 = Line L
12 = earth terminal
hanging
fixation
Electrostatic discharge can damage electronic com-
ponents!
Dangerous voltage on contact!
1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
2 (1) A (220 ... 240) V~
2 (1) A (220 ... 240) V~
R1
R2
T4A
220 ... 240 V~
mains terminals
fuse
output terminals
Sensor terminals earth terminals
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S1
S2
S4 / TRF
1.2.1 Allocation of terminals for system 1 Standard solar system with 1 store, 1 pump and 3 sen-
sors. The sensor S4 / TRF can optionally be used for heat
quantity balancing.
R1
Arr 1
S3
R2
S1
S2
R1 S3
S4 / TRF
Solar system and dual-mode DHW cylinder with 1
store, 3 sensors and backup-heating. The sensor S4 / TRF can
optionally be used for heat quantity balancing.
Arr 2
1.2.2 Allocation of terminals for system 2
Symbol Specification
S1 collector sensor
S2 store sensor lower
S3 store sensor upper
S4 / TRF sensor for heat quantity
balancing (optional)
R1 solar pump
R2 pump for heat exchange
Symbol Specification
S1 Collector sensor
S2 Store sensor lower
S3 Store sensor upper
(optional)
S4 / TRF Sensor for heat quantity
measurement (optional)
R1 Solar pump
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1
3
2
backwards forward
SET
(selection / adjustment mode)
The system monitoring display consists of 3 blocks: mode
indication, tool bar and system screen (active system
scheme).
The mode indication consists of two lines. The upper
line is an alphanumeric 16-segment display, in which mainly
the mode names / menu items are shown. In the lower
7-segment display, the channel values and the adjustment
parameter are indicated.
Temperatures and temperature differences are indicated
in or .
2.2.1 Mode indication
only mode indication
2.2.2 Tool bar
The additional symbols of the tool bar indicate the current
system status.
only tool bar
2. Operation and function
2.1 Pushbuttons for adjustment
The controller is operated by 3 pushbuttons below the
display. The forward-key (1) is used for scrolling forward
through the menu or to increase the adjustment values.
The backwards-key (2) is accordingly used for the reverse
function.
To confirm the current mode, hold down button 1 for 2
seconds. If an adjustment value is shown on the display,
SEt is indicated. In this case you can press the key „Set“ (3)
in order to change into input mode.
Select a mode by keys 1 and 2
Press key 3, so that „SEt“ flashes
Adjust the value by keys 1 and 2
Press key 3, so that „SEt“ permanently appears,
the selected value is now saved.
2.2 System monitoring display
!
Complete monitoring-display
Symbol standard flashing
relay 1 active
relay 2 active
maximum store limitation
active / maximum store
temperature exceeded
collector cooling function or
recooling function active
antifreeze- function activated collector minimum limitation
or antifreeze function active
collector security shutdown or
store security shutdown active
+ sensor defect
+ manual operation active
an adjustment channel is
changed SET-mode
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The system screen (active system scheme) shows the
schemes selected on the controller. It consists of several
system component symbols, which are - depending on the
current status of the system - either flashing, permanently
shown or hidden.
Sensors
Collector 1
Collector 2
Pumps
Heating
Sensor
Additional symbol for
operation of the burner
Valves
Store
Store heat exchanger Store 2 or back-up heating
(with additional symbol)
Sensor store upper
Valves
Collectors
with collector sensor
Pump
3-way valves
The flow direction or the
current breaking capacity are
always shown.
Heating circuit
Store 1 and 2
with heat exchanger
Back-upheat
with burner symbol
Temperature sensor
2.2.3 System screen
only system screen
Constantly green: everything functioning correctly
Red/green flashing: initialisation phase
manual operation
Red flashing: sensor defect
(sensor symbol is flashing quickly)
2.3 Flashing symbols
2.3.2 LED flashing codes
2.3.1 System screen flashing symbols
• Pumps are flashing during starting phase
• Sensors are flashing if the respective sensor-mode is se-
lected.
• Sensors are flashing quickly in case of sensor defect.
• Burner symbol is flashing if back-up heat is activated.
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3. Commissioning
To commission you have to adjust the solar thermal system
System types:
Arr 1 : standard solar system
Arr 2 : solar system with back-up heating
1
3
2
backwards forward
SET
(Selection / Adjustment mode)
Operation control lamp
Arr 1 Arr 2
1. Ac power supply must be activated. The controller passes
an initialisation phase in which the operating control lamp
flashes red and green. When the initialisation is complete,
the controller is in automatic operation with factory set-
tings. The default system scheme is Arr 1.
2. - select Arr
- change into -mode (see 2.1)
- select the system scheme by Arr-characteristics
- adjustment is saved by pressing button
Now the controller is ready for operation and should al-
low optimum operation of the solar system by the factory
settings.
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4. Control parameters and menu mode
4.1 Mode-overview
Legend:
x
Corresponding mode is available.
x*
Corresponding mode is available if the appropriate option
is activated.
Corresponding mode is only available if the option heat
quantity measurement is activated (OWMZ).
MEDT
The mode antifreeze content (MED%) is only shown if a
medium other than water or Tyfocor LS / G-LS (MEDT
0 or 3) is used. The adjustment is only appropriate when
using other types of antifreeze.
Corresponding mode is only available if the option heat
quantity measurement is deactivated (OWMZ).
Please note:
S3 and S4 are only indicated if sensors are connected.
mode Arr specification page
1 2*
COL x x Temperature collector 1 11
TST x Temperature store 1 11
TSTL x Temperature store 1 lower 11
TSTU x Temperature store 1 upper 11
S3 x Temperature sensor 3 11
TRF Temperature return flow 11
S4 Temperature sensor 4 11
h P x Operating hours relay 1 11
h P1 x Operating hours relay 1 11
h P2 x Operating hours relay 2 11
kWh Heat quantity kWh 12
MWh Heat quantity MWh 12
Arr 1-2 System 9
DT O x x Switch-on temperature difference 13
DT F x x Switch-off temperature difference 13
S MX x x Maximum temperature store 1 13
EM x x emergency temperature collector 1 14
mode Arr specification page
1 2
OCX x x Option collector cooling collector 1 14
CMX x* x* Maximum temperature collector 1 14
OCN x x Option minimum limitation
collector 1
14
CMN x* x* Minimum temperature collector 1 14
OCF x x Option antifreeze collector 1 14
CFR x* x* Antifreeze temperature collector 1 14
OREC x x Option recooling 15
O TC x x Option tube collector 15
AH O x Switch-on temp. for thermostat 1 15
AH F x Switch-off temp. for thermostat 1 15
OHQM x Option WMZ 12
FMAX Maximum flow 12
MEDT Antifreeze type 12
MED% MEDT MEDT Antifreeze content 12
HND x x Manual operation relay 1 16
HND2 x x Manual operation relay 2 16
LANG x x Language 16
PROG XX.XX Program number
VERS X.XX Version number
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4.1.1 Indication of collector temperatures
Shows the current collector temperature.
• COL : collector temperature (1-collector-system)
COL:
Collector temperature
display range: -40 ... +250 °C
4.1.2 Indication of store temperatures
Shows the current store temperature.
• TST : store temperature (1-store-system)
• TSTL : store temperature lower
• TSTU : store temperature upper
TST, TSTL, TSTU:
Store temperatures
display range: -40 ... +250 °C
4.1.3 Indication of sensor 3 and sensor 4
Shows the current temperature of the corresponding addi-
tional sensor (without control function).
• S3 : temperature sensor 3
• S4 : temperature sensor 4
Please note:
S3 and S4 are only indicated if the temperature sensors
are connected (shown).
S3, S4:
Sensor temperatures
display range: -40 ... +250 °C
4.1.4 Indication of other temperatures
Shows the current temperature of the sensor.
• TRF : temperature return flow
TRF:
other measured
temperatures
display mode: -40 ... +250 °C
4.1.5 Operating hours counter
h P / h P1 / h P2:
Operating hours counter
display mode
The operating hours counter adds up the solar operating
hours of the respective relay (h P / h P1 / hP2). Total hours
are shown on the display.
The total operating hours can be reset. When one opera-
ting hours mode is selected, the symbol is permanently
shown on the display. The button SET (3) must pressed
for approx. 2 seconds in order to get back into the RESET
mode of the counter. The display-symbol is flashing and
the operating hours will be set to 0. In order to finish the
RESET procedure, the button must be pressed in order
to confirm.
To interrupt the RESET procedure, no button should be
pressed for about 5 seconds. The controller returns auto-
matically into the menu mode.
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4.1.6 Heat quantity balancing
OHQM:Heat quantity balan-
cing
Adjustment range: OFF ... ON
Factory setting: OFF
Heat quantity balancing is possible for all systems in conjunc-
tion with a flowmeter. You just have to activate the option
heat quantity balancing in the mode OHQM.
The flow volume read by the flowmeter (l/min) must be
selected in the mode FMAX. Antifreeze type and concen-
tration of the heat transfer medium are indicated in modes
MEDT and MED%.
Type of antifreeze:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS
FMAX:
Volume flow in l/min
Adjustment range 0 ... 20
in steps of 0,1
Factory setting 6,0
kWh/MWh:Heat quantity
in kWh / MWh
display mode
MEDT: Type of antifreeze
Adjustment range 0 ... 3
Factory setting 1
MED%: Concentration of
antifreeze in (Vol-) %
MED% is blinded out by
MEDT 0 and 3.
Adjustment range 20 ... 70
Factory setting 45
The heat quantity transferred is calculated by the flow vo-
lume and the reference sensors of feed flow S1 and return
flow S4. It is shown in kWh in mode kWh and in MWh in
the mode MWh. The sum of both modes form the total
heat output.
The total heat quantity can be reset. As soon as one of the
display modes of the heat quantity is selected, the symbol
is permanently shown on the display. The button SET
(3) must be pressed for approx. 2 seconds to return to
the RESET mode of the counter. The display-symbol is
flashing and the value for heat quantity will be set to 0. To
finish the RESET-procedure, the button must be pressed
for confirmation.
To interrupt the RESET-procedure, no button should be
pressed for about 5 seconds. The controller returns auto-
matically into menu mode.
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4.1.7 ∆T-adjustment
Please note: Switch-on temperature difference DT O
must be at least 1 K higher than the switch-off temperature-
difference DT F.
DT O:
Switch-on temperature
Adjustment range 1,0...20,0 K
Factory setting 6.0
DT F:
Switch-off temperature diff.
Adjustment range
0,5 ... 19,5 K
Factory setting 4.0 K
4.1.8 Maximum store temperature
If the selected maximum temperature is exceeded, a further
loading of the store is stopped so that a damaging overheating
can be avoided. If the maximum store temperature is
exceeded, is shown on the display.
Please note: The controller is equipped with a safety-
switch-off of the store, which avoids a further loading of the
store if 95 °C are reached at the store.
S MX:
Maximum store temp.
Adjustment range 2..95 °C
Factory setting 60 °C
Basically the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O)
is reached, the pump is activated. If the selected switch-off
temperature is underrun (DT F), the controller switches
off.
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CMN:
Minimum collector tempera-
ture adjustment range
-10 ... 90 °C
Factory setting 10 °C
CMX:
Maximum collector temp.
Adjustment range
100 ... 190 °C
Factory setting120 °C
4.1.10 System cooling If the selected maximum store temperature is reached, the
solar system switches off. If then the collector temperatu-
re rises to the selected maximum collector temperature
(CMX), the solar pump remains activated until the collector
temperature falls below the temperature limit value. The
store temperature might continue to rise (up to the maxi-
mum store temperature), but only until 95 °C (emergency
shutdown of the store). If the store temperature is higher
than the maximum store temperature (S MX) and the col-
lector temperature is lower by at least 5 K than the store
temperature, the solar system remains activated until the
store is again cooled down by the collector and the pipes
to the selected maximum temperature (S MX).
In case of active system cooling is shown on the display
(flashing). Thanks to the cooling function the solar system
can be kept running for longer periods on hot summer days
and cooling of the collector and the heat transfer medium
is ensured as well.
OCX:
Option system cooling
Adjustment OFF ... ON
Factory setting OFF
4.1.11 Option minimum collector limit
OCN:
Minimum collector limit
Adjustment range OFF / ON
Factory setting OFF
The minimum collector temperature is a minimum switching
temperature, which must be exceeded to allow the solar
pump (R1/R2) to switch on. The minimum temperature
will prevent overswitching of the solar pump (or solid fuel
boiler charging pumps) at low collector temperatures. If the
minimum temperature is underrun, (flashing) is shown
on the display.
CFR:
Antifreeze temperature
Adjustment range
-10 ... 10 °C
Factory setting 4,0 °C
4.1.12 Option antifreeze function
OCF:
Antifreeze function
Adjustment range
OFF / ON
Factory setting OFF
The antifreeze function activates the loading circuit between
collector and store if the selected antifreeze function is
underrun in order to protect the medium from freezing or
thickening. If the selected antifreeze temperature is excee-
ded by 1 °C, the loading circuit will be deactivated.
Please note:
As there is only a limited heat quantity of the store available
for this function, the antifreeze function should only be
used in regions with few days of temperatures around the
freezing point.
4.1.9 Collector temperature limit
Collector emergency shutdown
If the selected collector limit temperature (EM) is exceeded,
the solar pump (R1/R2) is deactivated to avoid overheating
of the solar components (collector emergency shutdown).
The limit temperature is set to 140 °C but it can be changed
within the adjustment range of 110 ... 200 °C. In the display
(flashing) is shown.
EM:
Collector temperature limit
Adjustment range
110 ... 200 °C,
Factory setting 140 °C
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4.1.14 Tube collector special function If the controller measures an increase of 2 K compared
to the latest recorded collector temperature, the solar
pump is switched on to 100 % for about 30 seconds. After
this period the current collector temperature is stored as
new reference value. If the measured temperature (new
reference value) is again exceeded by 2 K, the solar pump
again switches-on for 30 seconds. If the switch-on difference
between collector and store is again exceeded during
runtime of the solar pump or the stopping of the system, the
controller automatically switches over to solar charging.
If the collector temperature drops by 2 K during this
stoppage, the switch-on value for the special tube collector
function will be recalculated.
O TC:
Tube collector special
function
Adjustment range:
OFF ... ON
Factory setting: OFF
4.1.13 Recooling function If the selected maximum store temperature (S MX)
is reached, the solar pump remains activated to avoid
overheating the collector. The store temperature might
continue to increase but only up to 95 °C (emergency
shutdown of the store).
In the evening the solar system continues running until
the store is cooled down to the selected maximum store
temperature via collector and pipes.
OREC:
option recooling
adjustment range
OFF ... ON
Factory setting: OFF
The thermostat function works independently from the
solar operation and can be used for use of surplus energy
back-up heating.
• AH O < AH F
the thermostat function is used for back-up heating
• AH O > AH F
the thermostat function is used for use of surplus
energy
is shown on the display if the second relay output is
activated.
4.1.15 Thermostat function
(Arr = 2)
back-up heating use of surplus energy
AH O:
Thermostat switch-on
temperature
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 40,0 °C
AH F:
Thermostat switch-off
temperature
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 45,0 °C
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For commissioning and service work the operating mode
of the controller can be manually selected by selecting the
adjustment value HAND / HND1 / HND2, in which the
following adjustments can be made:
4.1.16 Operating mode
• HAND / HND1 / HND2
Operating mode
OFF : relay off (flashing) +
AUTO : relay in automatic operation
ON : relay on (flashing) +
HAND / HND1 /
HND2:
Operating mode
Adjustment range:
OFF, AUTO, ON
Factory setting: AUTO
4.1.17 Language
The menu language can be selected in this channel.
• dE : German
• En : English
• It : Italiano
• FR : French
LANG:
Adjustment of language
Adjustment range: dE, En, It, FR
Factory setting: En
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1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
2 (1) A (220 ... 240) V~
2 (1) A (220 ... 240) V~
R1
R2
T4A
220 ... 240 V~
5. Tips for fault finding
can fuse T4A If a malfunction occurs, a notification is given on the display
of the controller:
Operating control lamp
Warning symbol
Operating control lamp off
The power supply to the controller should
be checked if the control lamp goes out.
o.k.no
The can fuse of the controller is defective.
It can be replaced after removal of the
front cover (spare fuse is enclosed in the
accessory bag).
Operating control lamp flashes red. On the display the
symbol and the symbol appear.
Sensor defect. An error code is shown
on the relevant sensor mode instead of
a temperature.
- 88.8888.8
open circuit. Check
the line.
Short-circuit.
Check the cables.
Pt1000 temperature sensors when discon-
nected can be checked with an ohmmeter.
In the following the resistance values
corresponding to different temperatures
are listed.
Resistance values of
the Pt1000-sensors
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Pump starts for a short moment, switches off, switches on
again, etc. (“controller hunting“)
Is the temperature diffe-
rence at the controller
too small?
no yes
Wrong position of the
collector sensor?
yes
Change ∆Ton and ∆Toff
accordingly.
Mount the collector sen-
sor at solar feed flow
(warmest collector out-
put); use the immersion
sleeve of the respective
collector.
Pump starts up very late and soon stops working soon. The temperature difference between store and collector
increases enormously during operation; the collector cir-
cuit cannot dissipate the heat.
Collector circuit pump
defect ?
no yes
Heat exchanger calcified?
yes
Control / replace
Decalification
no
Heat exchanger blocked?
yesno Cleaning
Heat exchanger too
small?
yes New calculation of the
dimension.
no
Check collector special
function.
Change ∆Ton and ∆Toff
accordingly.
Switch-on temperature
difference ∆Ton too high?
no yes
Collector sensor unfavour-
able placed (e.g. contact
sensor instead of immersion
sleeve sensor?
o.k.no
Pump is overheated, there is no heat transfer from coll-
ector to the store, feed flow and return flow are equally
warm, perhaps also bubble in the lines.
Drain the system; increa-
se system pressure to at
least static primary pres-
sure plus 0,5 bar; if neces-
sary continue to increase,
switch the pump for a
short time off and on.
Air in the system?
no yes
Is the collector circuit
blocked at the dirt trap?
yes
Clean the dirt trap
5.1Various:
If necessary activate tube
collector function.
yes
o.k.
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Stores are cooled during the night.
Does collector circuit
pump run during the
night?
no yes
Check the controller
functions correctly
Collector temperature is
at night higher than ambi-
ent temperature.
no yes
Check the return flow
preventer in feed flow and
return flow for functional
efficiency.
Is store insulation suffi-
cient?
yes no
Increase the insulation.
Is store insulation close
enough to the store?
yes no
Replace or intensify the
insulation.
Are the store connec-
tions insulated?
yes no Insulate connections.
Warm water outflow
upwards?
no yes
Change connection and
let the water flow side-
wards or through a siphon
(bow downwards); less
store losses now?
Does warm water circu-
lation run for a very long
time?
no yes
Use the circulation pump
with timer and switch-off
thermostat (energy effi-
cient circulation)
The solar circuit pump does not work although the coll-
ector is obviously warmer than the store.
Does the control LED
flash?
yes no
Does the pump start up
in manual operation?
yes
There is no current; check
fuses / replace them and
check power supply.
The selected temperature
difference for starting the
pump is too high; choose
suitable setting
no
Is the flow of the pump
seen by the controller?
yes
Is the pump stuck?
Put the pump into operati-
on by means of a screwdri-
ver; is there flow now ?
Is the pump defective ?
replace it.
Are the fuses of the
controller o.k.?
Controller seems to be
defective - replace it.
no yes
no
no yes
Replace the fuses.
Switch-off the circulation
pump and the blocking
valve for 1 night; less store
losses?
yes no
Check the pumps of the
backup heating circuit ac-
cording to nightly run and
defect return flow preven-
ter; problem solved?
no
no yes
o.k.
Control the return flow
preventer in warm water
circulation- o.k.
yes no
Please also check further
pumps which are connec-
ted to the solar store.
The gravitation circulation
in the circulation line is
too strong; insert a stron-
ger return flow preventer
or an electrical 2-way val-
ve behind the circulation
pump; the 2-way valve is
open in pump operati-
on, otherwise it is closed,
connect pump and 2-way
Cleaning or replacement.
valve in parallel; activate
the circulation again!
a
a b
b
SHR 521 20
© Drayton 06334 SHR 521 20.monen.indd
| 20
Distributed by:
Please note:
The design and the specifications are to be changed without notice.
The illustrations may differ from original product.
6. Accessories
Overvoltage protection
We highly recommend installing overvoltage protection in
order to avoid overvoltage damage to the collector (e.g.
by lightning).
Sensors
Our product range includes high-precision platinum tem-
perature sensors, flatscrew sensors, ambient temperature
sensors, indoor temperature sensors, cylindrical clip-on
sensors and irradiation sensors, which can be used as full
sensors with sensor pocket.
Flowmeter
If you are interested in heat quantity balancing, you need a
flowmeter for measuring the volume flow in your system.
Invensys Controls Europe
Sales: +44 (0) 845 / 130 5522
Technical: +44 (0) 845 / 130 5522
Fax: +44 (0) 845 / 130 0622
E-mail: customer.care@invensyscontrols.com
www.draytoncontrols.co.uk
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