Resol DeltaSol BS Plus User manual

D e lt a S o l® BS Plus
www.resol.com
Manual
RESOL D e lt a S o l® BS Plus
Mounting
Connection
Operation
Troubleshooting
Application examples
Thank you for buying this RESOL product.
Read this manual carefully to get the best perfomance from this unit.
Please keep this manual carefully.
48000550
*48000550*

D e lt a S o l® BS Plus
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Contents
Safety advice ........................................................................2
Technical data and overview of functions ........................3
1. Installation .............................................................4
1.1 Mounting .................................................................................. 4
1.2 Electrical Connection ........................................................... 4
1.2.1 Data communication / Bus ............................................. 5
1.2.2 Standard solar system ........................................................... 5
1.2.3 Solar system and heat exchange ........................................ 6
1.2.4 Solar system and afterheating ............................................. 6
1.2.5 Solar system and vertical tank charging ............................ 7
1.2.6 2-tank-solar system valve logic ........................................... 7
1.2.7 2-tank-solar system pump logic .......................................... 8
1.2.8 Solar system with 2 collectors ........................................... 8
1.2.9 Solar system afterheating by solid fuel boiler.................. 9
1.2.10 Solar system with heating circuit return preheating. ..... 9
2. Operation and function ......................................10
2.1 Adjustment buttons ............................................................ 10
2.2 System monitoring display .................................................10
2.2.1 Channel display .....................................................................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 Channel overview ................................................................ 13
4.1.1-5 Display channels ................................................................... 15
4.1.6-21 Adjustment channels ........................................................... 16
5. Troubleshooting ...................................................21
5.1 Various .................................................22
6. Accessories ..........................................................24
Imprint ...............................................................................24
Safety advice:
Please read the following information carefully before
installing and operating the controller. In this way damage
to the solar system caused by wrong installation will be
avoided. Please make sure that the mounting is adapted to
the characteristics of the building, that the local regulations
are respected and is conform with the technical rules.
Description of symbols
Signal words describe the danger that may occur, when it
is not avoided.
Warning means that injury, possibly life-threatening injury,
can occur.
Attention means that damage to the appliance can occur.
Information about the product
Proper usage
This product is to be used in solar thermal and heating
systems in compliance with the technical data specified in
these instructions.
Improper use excludes all liability claims.
Note
Strong electromagnetic fields can impair the
function of the controller.
ÎMake sure the controller as well as the
system are not exposed to strong electro-
magnetic fields.
WARNING! Warnings are indicated with a
warning triangle!
ÎThey contain information
on how to avoid the danger
described.
Note
Notes are indicated with an information
symbol.
Subject to technical change. Errors excepted.
Please pay attention to the following safety advice in order
to avoid danger and damage to people and property.
Instructions:
Equipment to be installed and used in accordance with the
rules of the National Electrical Code (NEC) or with Cana-
dian Electrical Code (CEC), Part I.
Attention should be paid to
- valid local regulations
- respective valid standards and directives
These instructions are exclusively addressed to authorized
skilled personnel.
- Only qualified electricians should carry out installation and
maintenance work.
- Initial installation should be carried out by qualified personnel

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!



• System-monitoring-display
• Up to 4 Pt1000 temperature
sensors
• 9 basic systems to choose from
• Heat quantity balancing
• VBus®
• Function control
• Thermostat function
(time controlled)
• Parametrization and control of
the system by Service Center
Software is possible
• User-friendly operation
• Housing with outstanding design
Included with the BS Plus:
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 enclosed in the full kit:
2 x sensor FKP6
2 x sensor FRP6
Technical data
Housing:
plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Ambient temp.: 32 ... 104 °F
Size: 172 x 110 x 46 mm
Mounting: wall mounting, mounting
into patch-panels is possible
Display: System screen for system
visualization, 16-segment display,
7-segment display, 8 symbols for system
status and operating control lamp
Operation: by 3 pushbuttons in the
front of the housing
Functions: Differential temperature
controller with optional add-on system
functions. Func ti on con trol according
to BAW-standards, operating hours
counter for solar pump, tube collector
function, thermostat function and heat
quantity balancing.
Inputs:
for 4 temperature sensors Pt1000
Outputs: 2 electromechanical relays
Bus: RESOL VBus®
Power supply: 115 V~
Total power supply: 4 (2) A 115V~

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1 2
S1 S2 S3
3456
Temp. Sensor Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
DE - 45527 Hattingen
DeltaSol BS Plus
2 (1) A 115
2
V~
(1) A 115 V~
R1
R2
T4A
115 V~
CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002
VBus
9 10
display
pushbutton
can fuse 4A
cable conduits with strain
relief
cover
1.1 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 power
supply 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
upper fastening
lower fastening
VBus
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 115 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 semiconductor relays, to
which loads such as pumps, valves etc. can be connected:
• Relay 1
18 = conductor R1
17 = neutral conductor N
13 = grounding conductor
• Relay 2
16 = conductor R2
15 = neutral conductor N
14 = grounding conductor
The temperature sensors (S1 up to S4) will be
connected to the following terminals independently of the
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 power supply is effected to the clamps:
19 = neutral conductor N
20 = conductor L
12 = ground clamp
power supply terminals
fuse
load terminalssensor terminal grounding terminal
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 capa-
citor from the accessory bag must be connected in par-
allel to the respective relay output if it feeds auxiliary
relays, motor valves, etc to prevent interference.
The minimum pump speed must be set to 100% when
auxiliary relays or valves are connected.
WARNING! Electric shock!
Opening the housing will expose
live parts!
ÎSwitch off power supply and dis-
connect the device from mains
before opening the housing!
ATTENTION! ESD damage!
Electrostatic discharge can lead to da-
mage to electronic components!
ÎTake care to discharge properly
before touching the inside of the
device!

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S1
S2
S4 / TRF
1.2.2 Terminal allocation - system 1 Standard solar system with 1 tank, 1 pump and 3 sensors.
Sensor S4 / TRF can optionally be used for heat quantity
balancing.
R1
Arr 1
S3
1.2.1 Data communication/ Bus 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.:
• calorimeter module WMZ
• large display GA3, smart display SD3
• data logger DL2
• RESOL 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 visualized.
The software allows easy function control and adjustment
of the system.
VBus
connection terminals
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Tank sensor at the top
(optionally)
S4 / TRF Sensor for heat quantity
measurement (optionally)
R1 Solar pump
1 2
S1 S2 S3
3456
Temp. Sensor Pt1000
LNR1NR2N
201918171615
S4
7 8 141312
DE - 45527 Hattingen
DeltaSol BS Plus
2 (1) A 115
2
V~
(1) A 115 V~
R1
R2
T4A
115 V~
CU 72060171 01
UL 60730-1A:2002
CSA E60730.1:2002
VBus
9 10

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R2
S1
S2
R1 S3
S4 / TRF
1.2.4 Terminal allocation - system 3 Solar system and after-heating with 1 tank, 3 sensors
and after-heating. Sensor S4 / TRF can optionally be used for
heat quantity balancing.
Arr 3
S1
S3
S4
R1
R2
S2
1.2.3 Terminal allocation - system 2 Solar system and heat exchange with an existing
tank with 1 tank, 4 sensors and 2 pumps.
Arr 2
Tank 1
Tank 2
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Tank sensor at the top
S4 Tank Sensor 2
R1 Solar pump
R2 Pump for heat exchange
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Tank sensor at the top
S4 / TRF Sensor for heat quantity
balancing (optional)
R1 Solar pump
R2 Pump for heat exchange

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1.2.5 Terminal allocation - system 4
1.2.6 Terminal allocation - system 5
S2
R1
S3
R2
S1
Solar system and vertical tank charging with 1 tank, 3
sensors, 1 solar pump and 3-way-valve. Sensor S4 / TRF can
optionally be used for heat quantity balancing.
2-tank-solar system with valve logic with 2 tanks,
3 sensors, 1 solar pump and 1 3-way-valve. Sensor S4 / TRF
can optionally be used for heat quantity balancing.
R2
S4 / TRF
S1
R1
S2 S3
S4 / TRF
Arr 4
Arr 5
Tank 1 Tank 2
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Tank sensor at the top
S4 / TRF Sensor for heat quantity
balancing (optionally)
R1 Solar pump
R2 3-way-valve
Symbol Specification
S1 Collector sensor
S2 Tank sensor 1
S3 Tank sensor 2
S4 / TRF Sensor for heat quantity
balancing (optionally)
R1 Solar pump
R2 3-way-valve

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1.2.7 Terminal allocation - system 7 Solar system with east-west collectors, 1 tank,
3 sensors and 2 solar pumps.
R1 R2
S1
S2
S3
Arr 7
S1
S2 S3
R1 R2
1.2.6 Terminal allocation - system 6 2-tank solar system with pump logic with 2 tanks, 3
sensors and 2 solar pumps.
Arr 6
Tank 1 Tank 2
S4
Symbol Specification
S1 Collector sensor
S2 Tank sensor 1
S3 Tank sensor 2
S4 Measuring sensor
(optinal)
R1 Solar pump 1
R2 Solar pump 2
Symbol Specification
S1 Collector sensor
S2 Tank sensor 1
S3 Collector sensor 2
S4 Measuring sensor
(optinal)
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
1.2.8 Terminal allocation - system 8
1.2.9 Terminal allocation - system 9
Solar system with solid fuel boiler after-heating
with 1 tank, 4 sensors, 1 solar pump and 1 pump for after-
heating.
Solar system and heating circuit return preheating
with 1 tank, 4 sensors, 1 solar pump and 1 3-way-valve for
heating circuit return preheating
Arr 8
Arr 9
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Tank sensor at the top
S4 Tank - solid fuel boiler
R1 Solar pump
R2 Solid fuel boiler pump
Symbol Specification
S1 Collector sensor
S2 Tank sensor bottom
S3 Upper tank sensor
S4 Tank sensor at the top
R1 Solar pump
R2 3-way-valve

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1
3
2
backward forward
SET
(selection / adjustment mode)
The system monitoring display consists of 3 blocks: chan-
nel display, tool bar and system screen (active system
scheme).
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 are either indicated in °F or °C, whereas tem-
perature differences are indicated in K or °Ra respectively.
2.2.1 Channel display
channel diplay
2.2.2 Tool bar
The additional symbols of the tool bar indicate the current
system status.
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 indication menu or to increase the adjustment
values. The backwards-key (2) is accordingly used for the
reverse function.
For adjustment of last indication channel, keep button 1
pressed for 3 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 channel by keys 1 and 2
Shortly press key 3, so that SET is blinking.
Adjust the value by keys 1 and 2
Shortly press key 3, so that SET permanently appears,
the adjusted value is now saved.
2.2 System monitoring display
!



monitoring-Display
Symbol standard blinking
relay 1 active
relay 2 active
maximum tank limitation
active / maximum tank
temperature exceeded
collector cooling function or
reccoling function active
antifreeze function activated collector minimum limitation
or antifreeze function active
collector emergency shutdown
or tank emergency shutdown
active
+ sensor defective
+ manual operation active
an adjustment channel is being
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 circuit
sensor
additional symbol for
operation of the burner
valve
tank
tank heat-exchanger tank 2 or afterheating (with an
additional symbol)
tank sensor
at the top
valve
Pump
3-way-valve
The flow direction or the
actual switching position is
shown.
Heating circuit
Tanks 1 and 2
with heat-exchanger
Afterheating
with burner symbol
Temperature sensor
2.2.3 System screen
system screen
green: everything OK
red/green flashing initialization phase
manual operation
red flashing: sensor fault
(sensor symbol is flashing quickly)
2.3 Flashing codes
2.3.2 LED flashing codes
2.3.1 System screen flashing codes
• Pumps are flashing during initialization 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 initialization phase, the
operating control lamp flashes red and green. After initial-
ization, 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 survey:
Arr 1 : standard solar system
Arr 2 : solar system with heat exchange
Arr 3 : solar system with after-heating
Arr 4 : solar system with vertical tank charging
Arr 5 : 2-tank solar system with valve logic
Arr 6 : 2-tank solar system with pump logic
Arr 7 : solar system with 2 collectors and 1 tank
Arr 8 : solar system with after-heating by solid fuel boiler
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 if the appropriate option
is activated.
 
Corresponding channel is only available if the option heat
quantity measurement is activated (OHQM).
MEDT
The channel antifreeze content (MED%) is only shown if the
antifreeze is not water or Tyfocor LS / G-LS (MEDT
0 or 3). Adjustments concerning the antifreeze content will
only make sense if the antifreeze is used in the solar circuit.
 
Corresponding channel is only available if the option heat
quantity measurement is deactivated (OHQM).
Please note:
Only if temperature sensors are connected, will
S3 and S4 be displayed.
Channel Arr Description 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 tank 1 15
TSTL x x x x Temperature tank 1 bottom 15
TST1 x x x Temperature tank 1 bottom 15
TSTU x x x x x Temperature tank 1 at the top 15
TST2 x x x Temperature tank 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
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
DT1F x x x Switch-off temperature difference 17
S MX x x x x x x Maximum temperature tank 1 17
S1 MX x x x Maximum temperature tank 1 17
DT2O x x x Switch-on temperature difference 2 17
DT2F x x x Switch-off temperature difference 2 17
S2MX x x x Maximum temperature tank 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 Description Page
123456789
OCX x x x x x x x x Option collector cooling collector 1 18
OCX1 x Option collector cooling 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 Option minimum limitation collector 1 18
OCN1 x Option minimum limitation collector 1 18
CMN x* x* x* x* x* x* x* x* Minimun temperature collector 1 18
CMN1 x* Minimun temperature collector 1 18
OCF x x x x x x x x Option antifreeze collector 1 18
OCF1 x Option antifreeze collector 1 18
CFR x* x* x* x* x* x* x* x* Antifreeze temperature collector 1 18
CFR1 x* Antifreeze temperature collector 1 18
EM2 x Emergency temperature collector 2 18
OCX2 x Option collector cooling collector 2 18
CMX2 x* Maximum temperature collector 2 18
OCN2 x Option minimum limitation collector 2 18
CMN2 x* Minium temperature collector 2 18
OCF2 x Option antifreeze 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 Option reccoling 19
O TC x x x x x x x x x Option tube collector 19
DT3O x x x Switch-on temperature difference 3 17
DT3F x x x Switch-off temperature difference 3 17
MX3O x x Switch-on treshold for maximum temp. 17
MX3F x x Switch-off treshold for maximum temp. 17
MN3O x x Switch-on treshold for minimum temp. 17
MN3F x x Switch-off treshold for minimum temp. 17
AH O x Switch-on temp. for thermostat 1 20
AH F x Switch-off temp. for thermostat 1 20
OHQM x x x x Option WMZ 16
FMAX     Maximum flow 16
MEDT     Antifreeze type 16
MED% MEDT MEDT MEDT MEDT Antifreeze concentration 16
t1 on x Switch on time 1 thermostat 20
t1 off x Switch off time 1 thermostat 20
t2 on x Switch on time 2 thermostat 20
t2 off x Switch off time 2 thermostat 20
t3 on x Switch on time 3 thermostat 20
t3 off x Switch off time 3 thermostat 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
UNIT x x x x x x x x x Selection: °FAH / °CEL 20
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)
• COL1 : collector temperature 1
• COL2 : collector temperature 2
COL, COL1, COL2:
Collector temperature
display range: -40 ... +480°F
4.1.2 Indication of tank temperatures
Shows the current tank temperature.
• TST : tank temperature (1-tank system)
• TSTL : tank temperature bottom
• TSTU : tank temperature top
• TST1 : temperature tank 1
• TST2 : temperature tank 2
TST, TSTL, TSTU,
TST1, TST2:
Tank temperatures
Display range: -40 ... +480 °F
4.1.3 Indication of sensors 3 and 4
Shows the current temperature of the corresponding addi-
tional sensor (without control function).
• S3 : temperature sensor 3
• S4 : temperature sensor 4
S3, S4:
S3, S4:
Sensor temperatures
Display range: -40 ... +480 °F
4.1.4 Indication of other temperatures
Shows the current temperature of the corresponding
sensor.
• TFSB : temperature solid fuel boiler
• TRET : temperature heating return preheating
• TRF : temperature return
TFSB, TRET, TRF:
Other mea sured tempe ratures
Display range: -40 ... +480 °F
4.1.5 Time
Indicates the actual time.
Press the 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.
Note:
S3 and S4 will only be indicated if the temperature
sensors are connected.

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4.1.7 Heat quantity balancing
OHQM:Heat quantity measu-
rement
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 fluid 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 steps 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 sup-
plied. 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 ∆T-regulation
DT O / DT1O / DT2O /
DT3O:
Switch on temperature diff.
Adjustment range 2,0 ... 40,0°Ra
Factory setting 12,0°Ra
DT F / DT1F / DT2F / DT3F:
Switch-off temperature diff.
Adjustment range 1,0 ... 39,0 °Ra
Factory setting 8,0 °Ra
4.1.9 Maximum tank temperature
Once the adjusted maximum temperature is exceeded, the
solar pump is switched off and further loading of the tank
is prevented to reduce scald risk or system damage. The
symbol is shown on the display.
S MX / S1MX / S2MX:
Maximum tank temp.
Adjustment range 40 ... 205°F
Factory setting 140°F
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 4 °Ra (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 1 °Ra higher than DT O.
Maximum temperature limitation
MX3O / MX3F:
Maximum temperature limitation
Adjustment range 30 ... 205°F
Factory setting
MX3O 140°F
MX3F 136°F
Minimum temperature limitation
MN3O / MN3F:
Minimum temperature limitation
Adjustment range 30 ... 195°F
Factory setting:
Arr = 2
MN3O 40°F
MN3F 50F
Arr = 8
MN3O 140°F
MN3F 150°F
4.1.10 ∆T-control (solid fuel boiler and heat exchange)
Please note:
The switch-on temperature difference must
be at least 2 °Ra higher than the switch-off
tempe rature difference.
DT S / DT1S / DT2S / DT3S:
Nominal temperature difference
Adjustment range 3,0 ... 60,0 °Ra
Factory setting 20.0 °Ra
RIS / RIS1 / RIS2 / RIS3:
Rise
Adjustment range 2 ... 40 °Ra
Factory setting 4 °Ra
Please note: The controller is also equipped
with a non-adjustable emergency switch-off if
the tank reaches 205°F.
In arrangements 2 and 8, the controller is equipped with an
additional differential control for heat exchange between
two tanks 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.

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CMN / CMN1 / CMN2:
Collector minimum temp.
Adjustment range 50 ... 195°F
Factory setting 50°F
CMX / CMX1 / CMX2:
Maximum collector temp.
Adjustment range 210 ... 380°F
Factory setting 250°F
4.1.12 System cooling When the adjusted maximum tank 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 coll-
ector temperature falls below the maximum collector tem-
perature. The tank temperature may increase (subordinate
active maximum tank temperature), but only up to 400°F
(emergency shutdown of the tank). If the tank temperature
is higher than the maximum tank temperature (S MX /
S1MX / S2MX) and if the collector temperature is at
least 10°Ra below the tank temperature, the solar system
remains activated until the tank 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 ON
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 15 ... 50°F
Factory setting 40°F
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 285°F but it can be changed within the
adjustment range of 230 ... 400°F. (flashing) is shown.
EM / EM1 / EM2:
Collector temperature limitation
Adjustment range 230 ... 400°F
Factory setting 285°F
The antifreeze function activates the loading circuit between
the collector and the tank 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 2 °F, the loading circuit will be
deactivated.
Note:
Since this function uses the limited heat quantity
of the tank, 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 tank systems. If the first priority tank 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
4°Ra, 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 tank, the second tank will be
loaded again for the „t-run“ time as before.
As soon as the switch-on condition of the priority tank
is fulfilled, it will be loaded. If the switch-on condition of
the priority tank is not fulfilled, loading of the second tank
will be continued. If the priority tank reaches its maximum
temperature, oscillating loading will not be carried out.
Oscillating break time / oscillating loading time /
collector rise temperature
4.1.17 Evacuated tube collector function If the controller detects an increase in collector temperature
by 4 °Ra 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 4 °Ra, the solar pump
will run for 30 seconds. If the switch-on difference between
the collector and the tank 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 4 °Ra during
standstill, the switch-on value for the evacuated tube
collector function will be recalculated.
O TC:
Evacuated tube collector
function
Adjustment range: OFF ... ON
Factory setting: OFF
4.1.16 Recooling function If the adjusted maximum tank temperature (S MX / S1MX
/ S2MX) is reached, the controller keeps the solar pump
running in order to prevent the collector from being
overheated. The tank temperature may increase but only up
to 205 °F (emergency shutdown of the tank).
In the evening, the solar thermal system remains switched
on until the tank is cooled down to the adjusted maximum
temperature via the collector and the pipework.
OREC:
Option recooling
adjustment rangeOFF ... ON
Factory setting: OFF
4.1.15 Tank sequence control
Corresponding adjustment values:
Factory setting Adjustment range
priority [PRIO] (1 / Arr 5,6) (2 / Arr 4) 0-2
break-time [tST] 2 min. 1-30 min.
loading runtime [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-tank systems only (system Arr = 4, 5, 6). If priority 0
is adjusted, the tanks with a temperature difference to the
collector are loaded in numerical order (tank 1 or tank 2).
Usually the tanks 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 HND1, HND2 in which the following
adjustments can be made:
4.1.19 Operating mode
• 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 p.
Adjustment range 30 ... 205°F
Factory setting 105°F
AH F:
Thermostat switch-off tem p.
Adjustment range 30 ... 205°F
Factory setting 115°F
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).
4.1.20 Language
The menu language can be adjusted in this channel.
• dE : German
• En : English
• It : Italiano
• Fr : French
LANG:
Language choice
Adjustment range: dE, En, It, Fr
Factory setting: En
Use of surplus energy
4.1.21 Unit
The menu unit can be adjusted:
• °FAH
• °CEL
UNIT:
Unit choice
Adjustment range: FAH, °C
Factory setting: FAH
Note:
Reference sensor for the thermostat function
is S3.