Resol DeltaSol BS Plus User manual

D e lt a S o l® BS Plus
www.resol.de
Thank you for buying this RESOL product.
Read this manual carefully to get the best perfomance from this unit.
RESOL D e lt a S o l® BS Plus
Mounting
Connection
Operation
Troubleshooting
Application examples
Manual
*48000500* 48000500
EN

D e lt a S o l® BS Plus
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Table of contents
Safety advice .......................................................................................................... 2
Description of symbols ......................................................................................... 2
Disposal .................................................................................................................. 2
Information about the product ............................................................................ 2
Technical data and overview of functions .......................................................... 3
1. Installation ............................................................................................... 4
1.1 Wall mounting ................................................................................................................... 4
1.2 Electrical connection ........................................................................................................ 4
1.2.1 Data communication / Bus ............................................................................................. 5
1.2.2-10 Terminal allocations for different solar systems ........................................................5
2. Operation and function ........................................................................ 10
2.1 Adjustment buttons .......................................................................................................10
2.2 System monitoring display ............................................................................................10
2.2.1 Display channels ..............................................................................................................10
2.2.2 Tool bar .............................................................................................................................10
2.2.3 System screen ..................................................................................................................11
2.3 Flashing codes ..................................................................................................................11
2.3.1 System-Screen flashing codes ......................................................................................11
2.3.2 LED flashing codes..........................................................................................................11
3. Commissioning ...................................................................................... 12
4. Control parameters and display channels .......................................... 13
4.1 Overview ..........................................................................................................................13
4.1.1-6 Display channels ..............................................................................................................15
4.1.6-21 Adjustment channels ......................................................................................................16
5. Troubleshooting ..................................................................................... 21
5.1 Various ..................................................................................................... 22
6. Accessory ............................................................................................... 24
Imprint ................................................................................................................. 24
Safety advice
Please pay attention to the follow-
ing safety advice in order to avoid
danger and damage to people and
property.
Instructions:
Attention should be paid to
- valid local regulations
- respective valid standards and
directives
These instructions are exclusively
addressed to authorised skilled
personnel.
- Only qualified electricians should
carry out installation and mainte-
nance work.
- Initial installation should be carried
out by qualified personnel
Declaration of conformity
The product complies with the relevant direc-
tives and is therefore labelled with the CE mark.
The Declaration of Conformity is available upon
request, please contact RESOL.
Subject to change. Errors excepted.
Description of symbols
Disposal
WARNING!
Warnings are indicated with a
warning triangle!
Signal words describe the danger that may occur, when it
is not avoided.
- Warning means that injuries or even danger of life can
occur.
- Dispose of the packaging in an environmentally sound
manner.
- Dispose of old appliances in an environmentally sound
manner. Upon request we will take back your old appli-
ances bought from us and guarantee environmentally-
friendly disposal of the devices.
Note
Notes are indicated with an information
symbol.
Information about the product
Appropriate usage
This product is to be used in solar thermal and heating
systems in com pliance with the technical data specified in
these instructions.
Improper use excludes all liability claims.

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!



• System-monitoring display
• Up to 4 temperature sensors
Pt1000
• 2 semiconductor relays for pump
speed control
• 9 basic systems to choose from
• Heat quantity measurement
• RESOL VBus®
• Function control
• Thermostat function
(time-controlled)
• Parametrisation and monitoring
of the system via RESOL Service
Center Software are possible
• User-friendly operation
• Easy-to-mount housing with
outstanding design
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, mounting
into patch-panels is possible
Display: System screen for system
visualisation, 16-segment display, 7-seg-
ment display, 8 symbols for system
status and operating control lamp
Operation: by 3 pushbuttons at the
front of the housing
Functions: Differential temperature
controller with optional add-on system
functions. Func ti on con trol, operating
hours counter for solar pump, tube
collector function, pump speed control,
thermostat function and heat quantity
measurement.
Inputs:
for 4 temperature sensors Pt1000
Outputs: 2 semiconductor relays
Bus: RESOL VBus®
Power supply:
220 ... 240 V~
Switching capacities:
1 (1) A 220 ... 240 V~
(semiconductor relay)
1 (1) A 220 ... 240 V~
(semiconductor relay)
Included:
1 x D e l t a S o l® BS Plus
1 x accessory bag
1 x spare fuse T4A
2 x screws and dowels
4 x strain relief and screws
1 x capacitor 4,7 nF
Additionally included in the full kit:
2 x sensor FKP6
2 x sensor FRP6
Technical data and overview of functions

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VBus
display
pushbutton
can fuse 4A
cable gland with
strain relief
cover
1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
VBus
9 10
1 (1) A (
1
220 ... 240) V~
(1) A (220 ... 240) V~
R1
R2
T4A
220 ... 240 V~
1.1 Wall mounting
The unit must only be located in dry interior locations. It
is not suitable for installation in hazardous locations and
should not be placed close to any electromagnetic fields. The
controller must additionally be supplied from a double-pole
switch with contact gap of at least 3 mm. Please pay attention
to separate routing of sensor cables and mains cables.
1. Unscrew the cross-head screw from the cover and
remove it along with the cover from the housing.
2. Mark the upper fastening point on the wall and drill and
fasten the enclosed wall plug and screw leaving the head
protruding.
3. Hang the housing from the upper fastening point and
mark the lower fastening point through the hole in the
terminal box (centres 130 mm). Drill and insert the lower
wall plug
4. Fasten the housing to the wall with lower fastening screw
and tighten.
1. Installation WARNING!
Always switch off power supply and
disconnect the controller from the
mains before opening the housing!
1.2 Electrical connection The power supply to the controller must be carried out via
an external power switch (last step!) and the supply voltage
must be 220 ... 240 V~ (50 ... 60 Hz). Flexible cables must be
attached to the housing with the enclosed strain relief and
the corresponding screws.
The controller is equipped with 2 standard relays, to which
the loads e.g. pumps, valves etc. can be connected:
• Relay 1
18 = conductor R1
17 = neutral conductor N
13 = ground clamp
• Relay 2
16 = conductor R2
15 = neutral conductor N
14 = ground clamp
The temperature sensors (S1 up to S4) have to be
connected to the following terminals (either 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 collector 2)
7 / 8 = Sensor 4 (e.g. Sensor store 2)
The mains supply is carried out at the following
terminals:
19 = neutral conductor N
20 = conductor L
12 = ground clamp
mains terminals
fuse
load terminalssensor terminals
upper fastening
lower fastening
ground terminls
Electrostatic discharge can lead to damage of elec-
tronic components!
Dangerous voltage on contact!
Please note:
The relays are semiconductor relays for pump
speed control - a minimum load of 20 W (power
consumption of the load) is required for faultless
function. The capacitor from the accessory bag
must be connected in parallel to the respective
relay output if it feeds auxiliary relays, mo-
tor valves, etc to prevent interference.
The minimum pump speed must be set to 100%
when auxiliary relays or valves are connected.

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S1
S2
S4 / TRF
1.2.2 Terminal allocation of system 1 Standard solar system with 1 store, 1 pump and 3
sensors. Sensor S4 / TRF can optionally be used for heat
quantity measurement.
R1
Arr 1
S3
1.2.1 Data communication / Bus
RESOL VBus
terminals
Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
(optional)
S4 / TRF sensor for heat quantity
measurement (optional)
R1 solar pump
The controller comes with a RESOL VBus® for data
transfer with and energy supply to external modules. The
connection is carried out at the terminals marked „VBus“
(either polarity). One or more RESOL VBus® modules can
be connected via this data bus, e.g.:
• RESOL calorimeter WMZ
• RESOL large display GA3, smart display SD3
• RESOL Data logger, DL2
• RESOL Data remote display
Additionaly, the controller can be connected to a PC with
a RESOL RS-COM adapter. With the RESOL ServiceCenter
Software (RSC) the controller parameters can be changed,
measurements can be read out, processed and visualised.
The software allows easy function control and adjustment
of the system. A light version of the software can be down-
loaded for free at www.resol.de.
1 2
S1 S2 S3
3456
Temp. Sensor
Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
VBus
9 10
1 (1) A (
1
220 ... 240) V~
(1) A (220 ... 240) V~
R1
R2
T4A
220 ... 240 V~

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R2
S1
S2
R1 S3
S4 / TRF
1.2.4 Terminal allocation of system 3 Solar system and after-heating with 1 store, 3 sensors
and after-heating. Sensor S4 / TRF can optionally be used for
heat quantity meaurement.
Arr 3
S1
S3
S4
R1
R2
S2
1.2.3 Terminal allocation of system 2 Solar system and heat exchange to existing store
with 1 store, 4 sensors and 2 pumps.
Arr 2
Store 1 Store 2 Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
(optional)
S4 store sensor 2
R1 solar pump
R2 pump for heat exchange
Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
(optional)
S4/TRF sensor for heat quantity
measurement (optional)
R1 solar pump
R2 pump for heat exchange

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1.2.5 Terminal allocation of system 4
1.2.6 Terminal allocation of system 5
S2
R1
S3
R2
S1
Solar system and store loading in layers with 1 store,
3 sensors, 1 solar pump and 3-port valve for store loading
in layers. Sensor S4 / TRF can optionally be used for heat
quantity measurement.
2-store-solar system with valve control with 2 stores,
3 sensors, 1 solar pump and 1 3-port valve. Sensor S4 / TRF
can optionally be used for heat quantity measurement.
R2
S4 / TRF
S1
R1
S2 S3
S4 / TRF
Arr 4
Arr 5
Store 1 Store 2
Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
(optional)
S4/TRF sensor for heat quantity
measurement (optional)
R1 solar pump
R2 3-port valve
Symbol Specification
S1 collector sensor
S2 store sensor 1
S3 store sensor 2
S4/TRF sensor for heat quantity
measurement (optional)
R1 solar pump
R2 3-port valve

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1.2.8 Terminal allocation of system 7 Solar system with east-west collectors, 1 store,
3 sensors and 2 solar pumps.
R1 R2
S1
S2
S3
Arr 7
S1
S2 S3
R1 R2
1.2.7 Terminal allocation of system 6 2-store-solar system with pump control with 2 stores,
3 sensors and 2 solar pumps.
Arr 6
Store 1 Store 2
S4 / TRF
Symbol Specification
S1 collector sensor
S2 store sensor 1
S3 store sensor 2
S4 measuring sensor
(optional)
R1 solar pump
R2 solar pump
Symbol Specification
S1 collector sensor
S2 store sensor 1
S3 collector sensor 2
S4 measuring sensor
(optional)
R1 solar pump collector 1
R2 solar pump collector 2

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S1
S3
S2
S4
R2
R1
S1
S4
S2
S3
R1
R2
1.2.9 Terminal allocation of system 8
1.2.10 Terminal allocation of system 9
Solar system with after-heating by solid fuel boiler
with 1 store, 4 sensors, 1 solar pump and 1 pump for after-
heating.
Solar system and heating circuit return preheating
with 1 store, 4 sensors, 1 solar pump and 1 3-port valve for
heating circuit return preheating.
Arr 8
Arr 9
Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
S4 sensor for solid fuel
boiler
R1 solar pump
R2 pump for solid fuel
boiler
Symbol Specification
S1 collector sensor
S2 lower store sensor
S3 upper store sensor
S4 heating circuit return
R1 solar pump
R2 3-port valve

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1
3
2
backward (-) forward (+)
OK
(selection / adjustment mode)
The system monitoring display consists of 3 blocks: channel
display, tool bar and system screen (active arrangement).
The channel display consists of two lines. The upper line is an
alpha-numeric 16-segment display (text display) for displaying
channel names and menu items. In the lower 7-segment
display, the channel values and the adjustment parameters
are displayed. Temperatures and temperature.
Temperatures and temperature differences are indicated in
or respectively.
2.2.1 Channel display
channel display only
2.2.2 Tool bar
The additional symbols in the tool bar indicate the current
system status.
tool bar only
2. Operation and function
2.1 Pushbuttons for adjustment The controller is operated via the 3 push buttons below the
display. The forward-button (1) is used for scrolling forward
through the display menu or to increase the adjustment values.
The backward-button (2) is similarly used for scrolling back-
wards and reducing values.
In order to access the adjustment mode, scroll down in the
display menu and press the forward button (1) for approx.
2 seconds after you have reached the last diplay item. If an
adjustment value is shown on the display, the ”SET“ icon
is displayed. Now, you can access the adjustment mode by
using button 3.
Press buttons 1 and 2 in order to select a channel
Briefly press button 3, „SET“ will flash
Adjust the value by pressing buttons 1 and 2
Briefly press button 3, so that SET permanently appears,
the adjusted value will be saved.
2.2 System monitoring display
!
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

System-monitoring display
Symbol normal flashing
relay 1 active
relay 2 active
maximum store limitation
active / maximum store
temperature exceeded
collector cooling function
active
recooling function active
antifreeze function active
collector minimum limitation
active
antifreeze function active
collector emergency shut-
down active or store emer-
gency shutdown active
+ sensor defective
+ manual operation active
SET-mode

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The system screen (active arrangement) shows the scheme
which has been selected. The screen 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 circuit
sensor
additional symbol for
operation of the burner
valve
store
store heat exchanger store 2 or afterheating (with
an additional symbol)
upper sensor store
valve
Pump
3-port valve
The flow direction or the
actual switching position is
shown.
Heating circuit
Stores 1 and 2 with heat-
exchanger
Afterheating
with burner symbol
Temperature sensor
2.2.3 System screen
System Screen only
green: everything OK
red/green flashing initialisation phase
manual operation
red flashing: sensor fault
(sensor symbol is flashing quickly)
2.3 Flashing codes
2.3.2 Operating control lamp flashing codes
2.3.1 System screen flashing codes
• Pumps are flashing during initialisation phase
• Sensor symbols are flashing if the corresponding sensor
display channel is selected.
• Sensors are flashing in the case of a sensor fault.
• Burner symbol is flashing if the after-heating is active
Collectors
with collector sensor

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3. Commissioning
When the controller is commissioned for the first time, the arrangement has to
be selected first
1. Switch on power supply. During the initialisation phase, the
operating control lamp flashes red and green. After initial-
isa tion, the controller is in the automatic mode with typical
settings. The pre-programmed system scheme is Arr 1.
2. Adjust the clock time in the TIME channel. Pressing the
button once for adjusting the hours, and press it once
again for adjusting the minutes.The time can be adjusted
using buttons 1 and 2 and saved by pressing the button.
3. - Select the adjustment channel Arr
- Change to the -mode (see 2.1)
- Select the arrangement via the Arr-index number
- Save the adjustment by pressing the button
Now the controller is ready for operation with typical settings
to suit that system and normally the factory settings will give
close to optimum operation.
System overview:
Arr 1 : standard solar system
Arr 2 : solar system with heat exchange
Arr 3 : solar system with after-heating
Arr 4 : solar system with store loading in layers
Arr 5 : 2-store solar system with valve control
Arr 6 : 2-store solar system with pump control
Arr 7 : solar system with 2 collectors and 1 store
Arr 8 : solar system with after-heating by solid fuel boilers
Arr 9 : solar system with heating circuit return preheating
1
3
2
backward forward
SET
(selection / adjustment mode)
operating control
lamp
Arr 1 Arr 2
Arr 3 Arr 4
Arr 5 Arr 6
Arr 7 Arr 8
Arr 9

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4. Control parameters and display channels
4.1 Overview of channels
Legend:
x
Corresponding channel is available.
x*
Corresponding channel is available when the corresponding
option is enabled
 
Only if the option heat quantity measurement is activated
(OHQM), will the corresponding channel be available.
MEDT
Only if an antifreeze (MEDT) other than water or Tyfocor
LS / G-LS (MEDT 0 or 3) is used, will the channel anti-
freeze concentration (MED%) be displayed.
 
Only if the option heat quantity measurement is deactivated
(OHQM), will the corresponding channel be available.
Please note:
Only if temperature sensors are connected, will S3 and S4
be displayed.
channel Arr specification page
123456789
COL x x x x x x x x Temperature Collector 1 15
COL 1 x Temperature Collector 1 15
TST x x Temperature Store 1 15
TSTL x x x x Temperature Store 1 bottom 15
TST1 x x x Temperature Store 1 bottom 15
TSTU x x x x x Temperature Store 1 top 15
TST2 x x x Temperature Store 2 bottom 15
TFSB x Temperature solid fuel boiler 15
TRET x Temperature heating circuit 15
COL2 x Temperature collector 2 15
S3 x Temperature sensor 3 15
TRF     Temperature return sensor 15
S4     x x Temperature sensor 4 15
n % x x x x Pump speed relay 1 15
n1 % x x x x x Pump speed relay 1 15
n2 % x x x x Pump speed relay 2 15
hP x x x x Operating hours relay 1 16
h P1 x x x x x Operating hours relay 1 16
h P2 x x x x x Operating hours relay 2 16
kWh     Heat quantity kWh 16
MWh     Heat quantity MWh 16
time x Time 15
Arr 1-9 System 12
DT O x x x x x x Switch-on temperature diff 17
DT1O x x x Switch-on temperature diff 1 17
DT F x x x x x x Switch-off temperature diff 1 17
DT S x x x x x x Nominal temperature difference 17
RIS x x x x x x Rise 17
DT1F x x x Switch-off temperature difference 17
DT1S x x x Rise 1 17
RIS1 x x x Maximum temperature store 1 17
S MX x x x x x x Maximum temperature store 1 17
S1 MX x x x Maximum temperature store 1 17
DT2O x x x Switch-on temperature difference 2 17
DT2F x x x Switch-off temperature difference 2 17
DT2S x x x Nominal temperature difference 2 17
RIS2 x x x Rise2 17
S2MX x x x Maximum temperature store 2 17
EM x x x x x x x x Emergency temperature collector 1 18
EM1 x Emergency temperature collector 1 18

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channel Arr specification page
123456789
OCX x x x x x x x x Collector cooling option collector 1 18
OCX1 x Collector cooling option collector 1 18
CMX x* x* x* x* x* x* x* x* Maximum temperature collector 1 18
CMX1 x* Maximum temperature collector 1 18
OCN x x x x x x x x Minimum limitation option collector 1 18
OCN1 x Minimum limitation option collector 1 18
CMN x* x* x* x* x* x* x* x* Minimum temperature collector 1 18
CMN1 x* Minimum temperature collector 1 18
OCF x x x x x x x x Antifreeze option collector 1 18
OCF1 x Antifreeze option collector 1 18
CFR x* x* x* x* x* x* x* x* Antifreeze temperature collector 1 18
CFR1 x* Antifreeze temperature collector 1 18
NOT2 x Emergency temperature collector 2 18
OCX2 x Collector cooling option collector 2 18
CMX2 x* Maximum temperature collector 2 18
OCN2 x Miminum limitation option collector 2 18
CMN2 x* Minimum temperature collector 2 18
OCF2 x Antifreeze option collector 2 18
CFR2 x* Antifreeze temperature collector 2 18
PRIO x x x Priority 19
tST x x x Break time 19
tRUN x x x Ciruclation runtime 19
OREC x x x x x x x x x Recooling option 19
O TC x x x x x x x x x Tube collector option 19
DT3O x x x Switch-on temperature difference 3 17
DT3F x x x Switch-off temperature difference 3 17
DT3S x x Nominal temperature ΔT3 17
RIS3 x x Rise ΔT3 17
MX3O x x Switch-on threshold for maximum temp. 17
MX3F x x Switch-off threshold for maximum temp. 17
MN3O x x Switch-on threshold for minimum temp. 17
MN3F x x Switch-off threshold for minimum temp. 17
AH O x Switch-on temp. for thermostat 1 20
AH F x Switch-off temp. for thermostat 1 20
t1on x Switch on time 1 thermostat 20
t1off x Switch off time 1 thermostat 20
t2on x Switch on time 2 thermostat 20
t2off x Switch off time 2 thermostat 20
t3on x Switch on time 3 thermostat 20
t3off x Switch off time 3 thermostat 20
OHQM x x x x Heat quantity measurement option
FMAX     Maximum flow
MEDT     Antifreeze type
MED% MEDT MEDT MEDT MEDT Antifreeze content 20
nMN x x x x Minimum pump speed relay 1 20
n1MN x x x x x Minimum pump speed relay 1 20
n2MN x x x x Minimum pump speed relay 2 20
HND1 x x x x x x x x x Manual operation relay 1 20
HND2 x x x x x x x x x Manual operation relay 2 20
LANG x x x x x x x x x Language 20
PROG XX.XX Program number
VERS X.XX Version number

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4.1.1 Indication of collector temperatures
Indicates the actual collector temperature.
• COL : collector temperature (1-collector-system)
• COL1 : collector temperature 1
• COL2 : collector temperature 2
COL, COL1, COL2:
Collector temperature
display range: -40 ... +250 °C
4.1.2 Indication of store temperatures
Indicates the actual store temperature.
• TST : store temperature (1-store-system)
• TSTL : store temperature bottom
• TSTU : store temperature top
• TST1 : temperature store 1
• TST2 : temperature store 2
TST, TSTL, TSTU,
TST1, TST2:
Store temperatures
Display range: -40 ... +250 °C
4.1.3 Indication of sensor 3 and sensor 4
Indicates the actual temperature of the corresponding ad-
ditional sensor (without control function).
• S3 : temperature sensor 3
• S4 : temperature sensor 4
S3, S4:
Sensor temperatures
Display range: -40 ... +250 °C
4.1.4 Indication of other temperatures
Indicates the actual temperature of the corresponding
sensor.
• TFSB : temperature - solid fuel boiler
• TRET : temperature - heating return
• TRF : temperature - return
TSFB, TRET, TRF:
Other mea sured tempe-
ratures
Display range: -40 ... +250 °C
4.1.5 Indication of current pump speed
Indicates the actual pump speed of the corresponding
pump.
• n % : actual pump speed (1-pump-system)
• n1 % : actual pump speed pump 1
• n2 % : actual pump speed pump 2
n %, n1 %, n2 %:
Actual pump speed
Display range: 30 ... 100 %
4.1.6 Time
Indicates the actual time.
Press button for 2 seconds in order to adjust the hours
and press it again in order to adjust the minutes (flashing).
The time can be set using buttons 1 and 2 and saved by
pressing the button.
Please note:
Only if the temperature sensors are connected
(displayed), will S3 and S4 be displayed.

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4.1.7 Heat quantity measurement
OHQM:Heat quantity
measurement
Adjustment range: OFF ... ON
Factory setting: OFF
Heat quantity measurement is possible in Arr 1, 3, 4, and 5
if a flowmeter is used. For this purpose, the heat quantity
measurement option (OHQM) has to be enabled.
The flow rate should be read from the flowmeter (l/min)
and has to be adjusted in the channel FMAX. Antifreeze
type and concentration of the heat transfer medium have
to be adjusted in the channels MEDT and MED%.
Antifreeze type:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor® LS / G-LS
FMAX: Flow rate in l/min
Adjustment range 0 ... 20
in 0,1 steps
Factory setting 6,0
kWh/MWh: Heat quantity
in kWh / MWh
Display channel
MEDT: Antifreeze
Adjustment range 0 ... 3
Factory setting 1
MED%: Concentration of
antifreeze in (Vol-) %
MED% is ”hidden“ when
MEDT 0 or 3 is used.
Adjustement range 20 ... 70
Factory setting 45
4.1.6 Operating hours counter
The operating hours counter accumulates the solar opera-
ting hours of the respective relay (h P / h P1 / h P2). Full
hours are displayed.
The accumulated operating hours can be set back to zero.
As soon as one operating hours channel is selected, the sym-
bol is displayed. Press the SET (3) button for approx. 2
seconds in order to access the RESET-mode of the counter.
The display symbol will flash and the operating hours
will be set to 0. Confirm the reset with the button in
order to finish the reset.
In order to interrupt the RESET-process, do not press a
button for about 5 seconds. The display returns to the
display mode.
h P / h P1 / h P2:
Operating hours counter
Display channel
The flow rate as well as the reference sensors S1 (flow) and
S4 (return) are used for calculating the heat quantity supplied.
It is shown in kWh in the channel kWh and in MWh in the
channel MWh. The overall heat quantity results from the
sum of both values.
The accumulated heat quantity can be reset. As soon as
one of the display channels of the heat quantity is selected,
the symbol is permanently shown on the display. Press
button SET (3) for about 2 seconds in order to access the
RESET mode of the counter. The display symbol will
flash and the heat quantity value will be set to 0. In order to
finish this process, press the button to confirm.
In order to interrupt the RESET process, no button should
be pressed for about 5 seconds. The controller automatically
returns to the display mode.

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4.1.8  ΔT-control
Please note:
The switch-on temperature difference must
be at least 1 K higher than the switch-off
tempe rature difference.
DT O / DT1O / DT2O /
DT3O:
Switch-on temperature diff.
Adjustment range 1,0 ... 20,0 K
Factory setting 6.0
DT F / DT1F / DT2F /
DT3F:
Switch-off temperature diff.
Adjustment range 0,5 ... 19,5 K
4.1.9 Maximum store temperature Once the adjusted maximum temperature is exceeded, the
solar pump is switched off and further loading of the store
is prevented to reduce scald risk or system damage. The
symbol is shown on the display.
S MX / S1MX / S2MX:
Maximum store temp.
Adjustment range 2 ... 95 °C
Factory setting 60 °C
DT S / DT1S / DT2S /
DT3S:
Nominal temperature difference
Adjustment range 1,5 ... 30,0 K
Factory setting 10.0
RIS / RIS1 / RIS2 / RIS3:
Rise
Adjustment range 1 ... 20 K
Factory setting 2 K
First the controller works as a standard differential controller.
If the switch-on difference (DT O / DT1O / DT2O) is
reached, the pump is activated at full speed for 10 seconds.
The speed is then reduced to the minimum pump speed
value (nMN / nMN1 / nMN2 = 30 %). If the temperature
difference reaches the adjusted set value (DT S / DT1S /
DT2S / DT3S), the pump speed increases by one step (10%).
If the difference increases by 2 K (RIS / RIS1 / RIS2 / RIS3),
the pump speed increases by 10 % respectively until the
maximum pump speed of 100 % is reached. The response
of the controller can be adapted via the parameter „Rise“. If
the temperature difference falls below the adjusted switch-
off temperature difference (DT F / DT1F / DT2F), the
controller switches off.
DT O and DT S are locked against each other. DT S must
be at least 0,5 K higher than DT O.
Maximum temperature limitation
In arrangements 2 and 8, the controller is equipped with an
additional differential control for heat exchange between
two stores or from a solid fuel back boiler (e.g. wood-
stove). Minimum and maximum temperature limits can
be set. The basic differential function is adjusted using the
switch on (DT3 O) and switch off (DT3 F) temperature
differences.
The MX3O / MX3F function provides a maximum tem-
perature setting, usually to reduce scald risk in a storage
tank. If MX3O is exceeded, relay 2 is switched off until the
sensor falls below MX3F. This function uses sensor 3 in Arr.
8 and sensor 4 in Arr.2.
The MN3O / MN3F function provides a minimum tem-
perature setting and aims to provide frost protection in
Arr.2, and back boiler protection in Arr.8. If the sensor
temperature falls below MN3O, relay 2 is switched off until
the temperature exceeds MN3F. This function uses sensor
4 in Arr.8 and sensor 3 in Arr.2.
Both switch-on and switch-off temperature differences
DT3O and DT3F are valid for the maximum and minimum
temperature limitation.
MX3O / MX3F:
Maximum temperature
limitation
Adjustment range
0,0 ... 95,0 °C
Factory setting
MX3O 60,0 °C
MX3F 58,0 °C
Minimum temperature limitation
MN3O / MN3F:
Minimum temperature limi-
tation
Adjustment range
0,0 ... 90,0 °C
Factory setting:
Arr = 2
MN3O 5,0 °C
MN3F 10,0 °C
Arr = 8
MN3O 60,0 °C
MN3F 65,0 °C
4.1.10 ΔT-control (solid fuel boiler and heat exchange)
Note:
The controller is also equipped with a non-
adjustable emergency switch-off if the store
reaches 95 °C. The reference sensor is S2 (or
S3 for two store systems).

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CMN / CMN1 / CMN2:
Collector minimum temp.
Adjustment range 10 ... 90 °C
Factory setting 10 °C
CMX / CMX1 / CMX2:
Collector maximum tem p-
erature
Adjustment range 100... 190 °C
Factory setting 120 °C
4.1.12 System cooling
When the adjusted maximum store temperature is reached,
the system stagnates. If the collector temperature increases
to the adjusted maximum collector temperature (CMX
/ CMX1 / CMX2), the solar pump is activated until the
collector temperature falls below the maximum collector
temperature. The store temperature may increase (sub-
ordinate active maximum store temperature), but only up
to 95 °C (emergency shutdown of the store). If the store
temperature is higher than the maximum store temperature
(S MX / S1MX / S2MX) and if the collector temperature
is at least 5 K below the store temperature, the solar system
remains activated until the store is cooled down below the
adjusted maximum temperature (S MX / S1MX / S2MX)
via the collector and the pipework.
If the system cooling function is enabled, (flashing) is
shown on the display. Due to the cooling function, the sy-
stem will have a longer operation time on hot summer days
and guarantees thermal relief of the collector field and the
heat transfer fluid.
OCX / OCX1 / OCX2:
Option System cooling
Adjustment range OFF ... ON
Factory setting OFF
4.1.13 Collector minimum limitation option
OCN / OCN1 / OCN2:
Collector minimum limitation
OFF / ON
Factory setting OFF
The minimum collector temperature is the minimum
temperature which must be exceeded for the solar pump
(R1 / R2) to switch on. The minimum temperature prevents
the pump from being switched on too often at low collector
temperatures. If the temperature falls below the minimum
temperature, (flashing) is shown on the display.
CFR / CFR1 / CFR2:
Antifreeze temperature
Adjustment range -10 ... 10 °C
Factory setting 4,0 °C
4.1.14 Antifreeze option
OCF / OCF1 / OCF2:
Antifreeze function
Adjustment range OFF / ON
Factory setting OFF
4.1.11 Collector temperature limitation
Emergency shutdown of the collector
If the adjusted collector emergency shutdown temperature
(EM / EM1 / EM2) is exceeded, the controller switches off
the solar pump (R1 / R2) in order to protect the system
against overheating (collector emergency shutdown). The
factory setting is 140 °C but it can be changed within the
adjustment range of 110 ... 200 °C. (flashing) is shown.
EM / EM1 / EM2:
Collector temperature
limitation
Adjustment range 110 ... 200 °C
Factory setting 140 °C
The antifreeze function activates the loading circuit between
the collector and the store when the temperature falls below
the adjusted antifreeze temperature. This will protect the
fluid against freezing or coagulating. If the adjusted antifreeze
temperature is exceeded by 1 °C, the loading circuit will be
deactivated.
Note:
Since this function uses the limited heat quantity
of the store, the antifreeze function should be
used in regions with few days of temperatures
around the freezing point.

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This function aims to extract the maximum solar gain in 2
store systems. If the first priority store cannot be loaded,
the second priority is checked. If useful heat can be added,
it will be loaded for the „oscillating loading time“ („t-run“
- factory default 15 min.) After this, the loading process
stops and the controller monitors the increase in collector
temperature during the break time „t-st“. If it increases by
2°C, the break time timer starts again to allow the collector
to gain more heat. If it does not, but useful heat can be
added to the second priority store, the second store will
be loaded again for the „t-run“ time as before.
As soon as the switch-on condition of the priority store is
fulfilled, it will be loaded. If the switch-on condition of the
priority store is not fulfilled, loading of the second store
will be continued. If the priority store reaches its maximum
temperature, oscillating loading will not be carried out.
Loading break time / store sequence control /
collector rise temperature
4.1.17 Tube collector function If the controller detects an increase in collector temperature
by 2 K compared to the previously stored collector
temperature, the solar pump will be switched-on at
100 % for about 30 seconds in order to detect the fluid
temperature. The current collector temperature will be
saved as a new reference value. If the measured temperature
(new reference value) is exceeded by 2 K, the solar pump
will run for 30 seconds. If the switch-on difference between
the collector and the store is exceeded during the runtime
of the solar pump or the standstill of the system, the
controller will automatically switch to solar loading.
If the collector temperature decreases by 2 K during
standstill, the switch-on value for the tube collector function
will be recalculated.
O TC:
Tube collector function
Adjustment range:
OFF ... ON
Factory setting: OFF
4.1.16 Recooling function If the adjusted maximum store temperature (S MX /
S1MX / S2MX) is reached, the controller keeps the solar
pump running in order to prevent the collector from being
overheated. The store temperature may increase but only
up to 95 °C (emergency shutdown of the store).
In the evening, the solar thermal system remains switched
on until the store is cooled down to the adjusted maximum
temperature via the collector and the pipework.
OREC:
Recooling option
adjustment range
OFF ... ON
Factory setting: OFF
4.1.15 Store sequence control
Corresponding adjustment values:
Factory setting Adjustment range
Priority [PRIO] (1 / Arr 5,6) (2 / Arr 4) 0-2
Oscillating break-time [tST] 2 min. 1-30 min.
Oscillating loading time [tRUN] 15 min. 1-30 min.
The D e l t a S o l® BS Plus priority logic The above-mentioned options and parameters are used in
multi-store systems only (system Arr = 4, 5, 6). If priority 0
is adjusted, the stores with a temperature difference to the
collector are loaded in numerical order (store 1 or store 2).
Usually the stores are loaded one after the other. Parallel
loading is also possible in Arr = 5, 6.
Priority:

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For control and service work, the operating mode of the
controller can be manually adjusted. For this purpose, select
the adjustment value HND, HND1, HND2 in which the
following adjustments can be made:
4.1.20 Operating mode
• HND / HND1 / HND2
Operating mode
OFF : relay off (flashing) +
AUTO : relay in automatic operation
ON : relay on (flashing) +
HND1/HND2:
Operating mode
Adjustment range:
OFF, AUTO, ON
Factory setting: AUTO
The thermostat function works independently from the
solar operation and can be used for using surplus energy
or for after-heating.
• AH O < AH F
thermostat function for after-heating
• AH O > AH F
thermostat function for using surplus energy
Symbol will be shown on the display if the second
relay output is activated.
4.1.18 Thermostat function (Arr = 3)
Afterheating
AH O:
Thermostat switch-on
tem perature
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 40,0 °C
AH F:
Thermostat switch-off tem-
pe rature
Adjustment range:
0,0 ... 95,0 °C
Factory setting: 45,0 °C
4.1.19 Pump speed control
A relative minimum pump speed for pumps can be allocated
to the outputs R1 and R2 via the adjustment channels nMN,
n1MN and n2MN.
nMN, n1MN, n2MN:
Pump speed control
Adjustment range:
30 ... 100
Factory setting: 30
t1 O, t2 O, t3 O:
Thermostat switch-on time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
t1 F, t2 F, t3 F:
Thermostat switch-off time
Adjustment range:
00:00 ... 23:45
Factory setting: 00:00
In order to block the thermostat function for a certain
period, there are 3 time frames t1 ... t3. If the function
should be active between 6:00 and 9:00, set t1 O to 6:00
and t1 F to 9:00. The thermostat function is factory set to
continuous operation.
If all time frames stop at 00:00 o’clock, the thermostat func-
tion is continuously activated (factory setting).
4.1.21 Language (LANG)
The menu language can be adjusted in this channel.
• dE : German
• En : English
• It : Italian
• Fr : French
LANG:
Language choice
Adjustment range: dE, En, It, Fr
Factory setting: En
Use of surplus energy
Note:
When loads which are not speed-controlled (e.g.
valves) are used, the value must be changed to 100 %
in order to deactivate pump speed control.