Resol DeltaSol BS/2 User manual

*48005952* 48005952
Thank you for buying this RESOL product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual safe.
DeltaSol®BS/2
www.resol.com
Manual
en
Solar controller
Manual for the
specialised craftsman
Installation
Operation
Functions and options
Troubleshooting
(Version 2)

2
en
© 20150831_48005952_DeltaSol_BS2_V2.monen
Safety advice
Please pay attention to the following safety advice in order to avoid danger and
damage to people and property.
Instructions
Attention must be paid to the valid local standards, regulations and directives!
Information about the product
Proper usage
The solar controller is designed for electronically controlling standard solar thermal
systems in compliance with the technical data specified in this manual.
Improper use excludes all liability claims.
CE Declaration of conformity
The product complies with the relevant directives and is therefore la-
belled with the CE mark.The Declaration of Conformity is available on
request, please contact the manufacturer.
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 electromagnetic fields.
Target group
These instructions are exclusively addressed to authorised skilled personnel.
Only qualified electricians should carry out electrical works.
Initial installation must be effected by the system owner or qualified personnel
named by the system owner.
Description of symbols
WARNING! Warnings are indicated with a warning triangle!
ÎThey contain information on how to avoid the dan-
ger described.
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.
Note:
Notes are indicated with an information symbol.
ÎArrows indicate instruction steps that should be carried out.
Disposal
• Dispose of the packaging in an environmentally sound manner.
• Dispose of old appliances in an environmentally sound manner. On request we
will take back your old appliances bought from us and guarantee an environmen-
tally sound disposal of the devices.
Subject to technical change. Errors excepted.

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1 Overview ..............................................................................................4
2 Installation ...........................................................................................5
2.1 Mounting........................................................................................................................5
2.2 Electrical connection...................................................................................................6
2.3 Data communication / Bus ..........................................................................................6
2.4 System: Standard solar system with 1 store..........................................................7
3 Operation and function ......................................................................9
3.1 Buttons...........................................................................................................................9
4 System-Monitoring-Display ................................................................9
4.1 System screen.............................................................................................................10
4.2 Other indications.......................................................................................................10
5 Commissioning..................................................................................11
6 Channel overview ..............................................................................12
6.1 Display channels .........................................................................................................12
6.2 Adjustment channels.................................................................................................14
7 Troubleshooting.................................................................................22
8 Accessories ........................................................................................25
8.1 Sensors and measuring instruments......................................................................26
8.2 VBus®accessories......................................................................................................26
8.3 Interface adapters ......................................................................................................26
9 Index ...................................................................................................27
Contents
DeltaSol®BS/2 Solar controller
The RESOL controller for standard solar thermal systems.
The DeltaSol®BS controller provides a clear operating concept and is equipped
with the illuminated combined display with system-monitoring. Flashing symbols for
sensors, pumps and valves enable an immediate allocation of temperatures, tem-
perature differences and active actuators.Thus, adjusting and monitoring the solar
system is quick and easy.

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1 Overview
• Drainback option
• Heat quantity measurement
• Commissioning menu
• Unit °F and °C selectable
• HE pump control via adapter
Technical data
Inputs: 4 Pt1000 temperature sensors
Outputs: 1 semiconductor relay
Switching capacity: 1 (1) A 240 V~ (semiconductor relay)
Total switching capacity: 1 A 240 V~
Power supply: 100 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: 0.45 W
Mode of operation: type 1.C.Y action
Rated impulse voltage: 2.5 KV
Data interface: RESOL VBus®
VBus®current supply: 35 mA
Functions: Differential temperature controller with optional add-on system func-
tions. Function control, operating hours counter, heat quantity measurement and
speed control
Housing: plastic, PC-ABS and PMMA
Mounting: wall mounting, also suitable for mounting into patch panels
Indication / Display: System-Monitoring-Display for visualisation of systems,
16-segment and 7-segment display, 8 symbols for indication of system status and
operating control lamp
Operation: 3 push buttons at the front of the housing
Protection type: IP 20 / EN 60529
Protection class: II
Ambient temperature: 0 … 40 °C
Degree of pollution: 2
Dimensions: 172 x 110 x 49 mm
104 mm
4.1“
130 mm
5.1“
2.6"
66 mm
4.3"
110 mm
6.8"
172 mm
1.1"
28 mm
0.4" / 11 mm
1.9" / 47 mm
0.5" / 13 mm
6.1"
155 mm
Upper fastening point
Lower fastening point

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5
InstallationIndications, functions and optionsMessages Commissioning Operation and function
2 Installation
2.1 Mounting
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply
before opening the housing!
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 electromagnetic fields.
The device must only be located in dry interior rooms.
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.
In order to mount the device to the wall, carry out the following steps:
ÎUnscrew the crosshead screw from the cover and remove it along with the
cover from the housing.
ÎMark the upper fastening point on the wall. Drill and fasten the enclosed wall
plug and screw leaving the head protruding.
ÎHang the housing from the upper fastening point and mark the lower fastening
point (centres 130 mm).
ÎInsert lower wall plug.
ÎFasten the housing to the wall with the lower fastening screw and tighten.
ÎCarry out the electrical wiring in accordance with the terminal allocation (see
page 6).
ÎPut the cover on the housing.
ÎAttach with the fastening screw.
display
button
T4A fuse
cable glands and
strain relief
cover

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Installation Indications, functions and options MessagesCommissioningOperation and function
2.2 Electrical connection
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply
before opening the housing!
ATTENTION! ESD damage!
Electrostatic discharge can lead to damage to electronic com-
ponents!
ÎTake care to discharge properly before touching
the inside of the device!
Note:
The pump speed must be set to 100% when auxiliary relays or valves are
connected.
Note:
Connecting the device to the power supply must always be the last step
of the installation!
Note:
It must be possible to disconnect the device from the mains at any time.
ÎInstall the mains plug such that it is accessible at any time.
ÎIf this is not possible, install a switch that can be accessed.
Do not use the device if it is visibly damaged!
The power supply of the controller must be carried out via an external power
switch.The power supply of the device must be 100… 240 V~ (50 … 60 Hz).Attach
flexible cables to the housing with the enclosed strain relief and the corresponding
screws.
The controller is equipped with 1 semiconductor relay to which a load such as a
pump, a valve, etc. can be connected:
• Relay 1
18 = Conductor R1
17 = Neutral conductor N
13 = Grounding terminal
The mains connection is at the following terminals:
19 = Neutral conductor N
20 = Conductor L
12 = Grounding terminal ⌯
VBus®
Made in Germany
DE-45527 Hattingen
DeltaSol BS/2 V2
IP 20
T4A
100 ... 240 V~
50-60 Hz
CU 72091163 01
Temp. Sensor Pt1000
S1 S2 S3 S4 R1VBus
1234 567891012131417181920
NNL
1 (1) A 100 ... 240 V~
mains terminals
fuse
load terminalssensor terminals grounding
terminals
Connect the temperature sensors (S1 to S4) to the corresponding terminals
with either polarity:
1 / 2 = Sensor 1 (e. g. collector sensor)
3 / 4 = Sensor 2 (e. g. store sensor)
5 / 6 = Sensor 3 (e. g. store sensor top)
7 / 8 = Sensor 4 (e. g. return sensor)
2.3 Data communication / Bus
The controller is equipped with a RESOLVBus®for data transfer and energy supply
to external modules.The connection is to be carried out at the terminals marked
VBus (any polarity).
One or more RESOLVBus®modules can be connected via this data bus, such as:
• RESOL DL2 Datalogger
• RESOL DL3 Datalogger
• VBus®/ PWM interface adapter
Furthermore, the controller can be connected to a PC or integrated into a network
via the RESOLVBus®/USB orVBus®/LAN interface adapter (not included). Different
solutions for visualisation and remote parameterisation are available on the RESOL
website www.resol.com.
Note:
More accessories on page 25.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
2.4 System: Standard solar system with 1 store
The controller calculates the temperature difference between collector sensor S1
and store sensor S2. If the difference is larger than or identical to the adjusted
switch-on temperature difference (DT O), the solar pump will be activated by the
relay, and the store will be loaded until the switch-off temperature difference (DTF)
or the maximum store temperature (S MX) is reached.
Sensors S3 and S4 can optionally be connected for measurement purposes. S3 can
optionally be used as the reference sensor for the store emergency shutdown op-
tion (OSEM).
If heat quantity measurement (OHQM) is activated, S4 is to be used as the return
sensor.
910
VBus
Netz
Mains
3322
S1
S2
S4 / TR
R1
S3
S1
S3
S2
S4/TR
R1
Example Drainback
system

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Installation Indications, functions and options MessagesCommissioningOperation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 12
FLL x* ODB filling time active - 12
STAB x* ODB stabilisation in progress - 12
COL x Temperature collector S1 12
TST x Temperature store S2 12
S3 x Temperature sensor 3 S3 12
TSTT x* Temperature store top S3 13
S4 x Temperature sensor 4 S4 12
TR x* Temperature return sensor S4 13
n % x Speed R1 R1 13
hP x Operating hours R1 R1 13
kWh x* Heat quantity in kWh - 13
MWh x* Heat quantity in MWh - 13
Adjustment channels
Channel Description Factory setting Page
DT O x Switch-on temperature difference 6.0 K [12.0 °Ra] 14
DT F x Switch-off temperature difference 4.0 K [8.0 °Ra] 14
DT S x Set temperature difference 10.0 K [20.0 °Ra] 14
RIS x Rise 2 K [4 °Ra] 15
nMN x Minimum speed 30 % 15
S MX x Maximum store temperature 140 °F [60 °C] 15
OSEM xStore emergency shutdown option OFF 16
EM x
Collector emergency temperature 130 °C [270 °F] 16
Collector emergency temperature if ODB is
activated:
200 °F [95 °C] 16
OCC x Collector cooling option OFF 16
CMX x* Maximum collector temperature 110 °C [230 °F] 16
OSYC x System cooling option OFF 17
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0 °Ra] 17
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0 °Ra] 17
OSTC x Store cooling option OFF 17
OHOL x* Holiday cooling option OFF 17
THOL x* Holiday cooling temperature 40 °C [110 °F] 17
OCN x Collector minimum limitation option OFF 18
CMN x* Collector minimum temperature 10 °C [50 °F] 18
OCF x Antifreeze option OFF 18
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 18
OHQM x Heat quantity measurement option OFF 18
FMAX x* Maximum flow rate 6.0 l 18
MEDT x* Antifreeze type 1 18
MED% x* Antifreeze concentration(only if MEDT =
propylene or ethylene glycol)
45 % 18
ODB x Drainback option OFF 19
tDTO x* ODB switch-on condition - time period 60 s 19
tFLL x* ODB filling time 5.0 min 19
tSTB x* ODB stabilisation time 2.0 min 19
MAN1 x Manual mode R1 Auto 20
ADA1 xHE pump control OFF 20
LANG x Language dE 20
UNIT x Temperature unit °C 20
RESE x Reset - back to factory settings 21
W002#### Version number
Legend:
Symbol Description
x Channel is available
x* Channel is available, if the corresponding option is activated.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
3 Operation and function
3.1 Buttons
2 backwards (-)
1 forwards (+)
3 Ⓢ(selection /
confirmation)
Operating control
LED
The controller is operated via the 3 push buttons below the display.
Button 1 (+) - scrolling forwards, increasing adjustment values.
Button 2 (-) - scrolling backwards, reducing adjustment values.
Button 3 (OK) -confirming / selecting.
During normal operation, display channels will be displayed.
ÎIn order to scroll between display channels, press buttons 1 and 2.
Access to adjustment channels:
ÎUse button 1 in order to scroll to the last display channel, then press and hold
down button 1 for approx. 2 s.
If an adjustment channel is shown on the screen, Ⓢwill be displayed on the
right-hand side next to the channel name.
ÎPress button 3 in order to select an adjustment channel.
Ⓢstarts flashing.
ÎAdjust the desired value with buttons 1 and 2.
ÎBriefly press button 3.
Ⓢpermanently appears, the adjusted value has been saved.
4 System-Monitoring-Display
System-Monitoring-Display
The System-Monitoring-Display consists of 3 blocks: channel display, tool bar and
system screen.
Channel display
The channel display consists of 2 lines. The upper display line is an alphanumeric
16-segment display. In this line, mainly channel names and menu items are displayed.
In the lower 16-segment display, values are displayed.
Tool bar
The additional symbols in the tool bar indicate the current system state.

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Installation Indications, functions and options MessagesCommissioningOperation and function
4.1 System screen
The system selected is indicated in the System-Monitoring-Display. It consists of
several system component symbols which are – depending on the current status of
the system – either flashing, permanently shown or not indicated.
Pump
Store
with heat exchanger
Temperature sensor
Collector
with collector sensor
4.2 Other indications
System screen
• Pump symbol is flashing when the relay is active.
• Sensor symbols are flashing, if the corresponding sensor display channel is se-
lected
• Sensors are flashing quickly in the case of a sensor fault
Operating control LED
Green: Everything OK
Red / green flashing: Initialisation active
Red flashing: Manual mode
Sensor fault (sensor symbol is flashing quickly)
Permanently
shown Flashing Status indications:
⓵Relay 1 active
☼Maximum store temperature exceeded
⚠+ ☼Store emergency shutdown active
⚠Collector emergency shutdown active
⓵ ☼ Collector cooling active
⓵ ☼ System cooling active
⓵+ ☼Store cooling active
☼ ⚠ Holiday cooling option activated
⓵+ ☼ ⚠ Holiday cooling active
❄Collector minimum limitation active
❄Antifreeze function activated
⓵ ❄ Antifreeze function active
☛+ ⓵ ⚠ Manual mode relay 1 ON
☛ ⚠ Manual mode relay 1 OFF
☍ ⚠ Sensor fault

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
5 Commissioning
2 backwards (-)
1 forwards (+)
3 Ⓢ(selection /
confirmation)
ÎConnect the device to the mains
The controller runs an initialisation phase in which the operating control LED flash-
es red / green.
When the controller is commissioned or when it is reset, it will run a commission-
ing menu. The commissioning menu leads the user through the most important
adjustment channels needed for operating the system.
adjustment mode flashing
Operation
changing a value flashing
confirming a value not flashing
to the next
parameter
1
1
3
3
2
2
1. Language
ÎAdjust the desired menu language.
LANG
Language selection
Selection: dE, En, Fr
Factory setting: dE
2. Temperature unit
ÎAdjust the desired unit.
UNIT
Temperature unit
Selection: °F, °C
Factory setting: °C
3. Maximum store temperature
ÎAdjust the maximum store temperature.
S MX
Adjustment range: 4 … 95 °C [40 … 200 °F]
Factory setting: 60 °C [140 °F]
Note:
The controller is also equipped with a
non-adjustable emergency shutdown, deacti-
vating the system if the store reaches 95 °C
[200 °F].
Commissioning

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Installation Indications, functions and options MessagesCommissioningOperation and function
6 Channel overview
6.1 Display channels
Note:
The displayed values and adjustment channels depend on which options
and functions have been selected. Only values and adjustment channels
available for the individual settings selected will appear in the menu.
Display of drainback time periods
Initialisation
INIT
ODB initialisation active
Indicates the time adjusted in tDTO, running backwards.
Filling time
FLL
ODB filling time active
Indicates the time adjusted in tFLL, running backwards.
Stabilisation
STAB
ODB stabilisation in progress
Indicates the time adjusted in tSTB, running backwards.
4. Minimum speed
ÎAdjust the minimum speed for the corresponding
pump.
nMN
Speed control
Adjustment range: 30 … 100 %
Factory setting: 30
Note:
The pump speed must be set to 100% when
auxiliary relays or valves are connected.
Confirmation
Completing the commissioning menu
After the last channel of the commissioning menu has
been adjusted and confirmed, the controller asks for
confirmation of the adjustments.
ÎIn order to confirm the adjustments made in the
commissioning menu, press button 3.
The controller is then ready for operation and nor-
mally the factory settings will give close to optimum
operation.
Note:
The adjustments carried out during commis-
sioning can be changed anytime in the cor-
responding adjustment channel. Additional
functions and options can also be activated or
deactivated (see page 14).
Commissioning

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13
InstallationIndications, functions and optionsMessages Commissioning Operation and function
Display of collector temperatures
COL
Collector temperature
Display range: -40 … + 260 °C [-40 … + 500 °F]
Indicates the collector temperature.
Display of store temperatures
TST
Store temperature
Display range: -40 … + 260 °C [-40 … + 500 °F]
Indicates the store temperature.
Indication of sensors 3 and 4
S3, S4
Sensor temperatures
Display range: -40 … + 260 °C [-40 … + 500 °F]
Indicates the current temperature at the corresponding additional sensor (without
control function).
• S3:Temperature at sensor 3
• S4:Temperature at sensor 4
Note:
S3 and S4 will only be indicated if the temperature sensors are connected
to the corresponding terminals.
Indication of return temperature
TR
Return temperature
Display range: -40 … + 260 °C [-40 … + 500 °F]
If the heat quantity measurement is activated, the temperature at sensor S4 will be
indicated as TR.
Indication of current pump speed
n %
Current pump speed
Display range: 30 … 100 %
Indicates the current pump speed.
Display of heat quantity
kWh / MWh
Heat quantity in kWh / MWh
Display channel
Indicates the heat quantity produced in the system.For this purpose, the heat quan-
tity measurement option has to be enabled.The flow rate as well as the values of
the reference sensors flow and return are used for calculating the heat quantity
supplied. It is shown in kWh in the kWh channel and in MWh in the MWh channel.
The overall heat quantity results from the sum of both values.

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Installation Indications, functions and options MessagesCommissioningOperation and function
The accumulated heat quantity can be set back to zero.As soon as one of the dis-
play channels of the heat quantity is selected, the symbol Ⓢis displayed.
ÎIn order to access the reset mode of the counter, press button 3 for approx. 2 s.
Ⓢstarts flashing and the heat quantity value will be set back to zero.
ÎIn order to finish the reset process, press button 3.
In order to interrupt the reset process, do not press any button for about 5 s.The
display returns to the display mode.
Operating hours counter
h P
Operating hours counter
Display channel
The operating hours counter accumulates the operating hours of the correspond-
ing relay (h P).
Full hours are displayed.
The accumulated operating hours can be set back to zero. As soon as one of the
display channels of the heat quantity is selected, the symbol Ⓢis displayed.
ÎIn order to access the reset mode of the counter, press button 3 for approx.2 s.
Ⓢstarts flashing and the operating hours value will be set back to zero.
ÎIn order to finish the reset process, press button 3.
In order to interrupt the reset process, do not press any button for about 5s.The
display returns to the display mode.
6.2 Adjustment channels
∆T control
DT O
Switch-on temperature difference
Adjustment range: 1.0 … 20.0 K [2.0 … 40.0 °Ra]
Factory setting: 6.0 K [12.0 °Ra]
The controller works as a standard differential controller. If the temperature reach-
es or exceeds the switch-on temperature difference, the pump switches on.When
the temperature difference reaches or falls below the adjusted switch-off tempera-
ture difference, the respective relay switches off.
Note:
The switch-on temperature difference must be at least 0.5K [1 °Ra] higher
than the switch-off temperature difference.
DT F
Switch-off temperature difference
Adjustment range: 0.5 … 19.5 K [1.0 … 39.0 °Ra]
Factory setting: 4.0 K [8.0 °Ra]
Note:
When the drainback option ODB is activated, the values of the param-
eters DT O, DT F and DT S will be adapted to values suiting drainback
systems:
DT O = 10 K [20 °Ra]
DT F = 4 K [8 °Ra]
DT S = 15 K [30 °Ra]
Adjustments previously made in these channels will be overridden and
have to be entered again if ODB is deactivated later on.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Speed control
DT S
Set temperature difference
Adjustment range: 1.5 … 30.0 K [3.0 … 60.0 °Ra]
Factory setting: 10.0 K [20.0 °Ra]
Note:
For pump speed control, the operating mode of the corresponding relay
must be set to Auto (adjustment channel MAN).
RIS
Rise
Adjustment range: 1 … 20 K [2 … 40 °Ra]
Factory setting: 2 K [4 °Ra]
If the temperature difference reaches or exceeds the switch-on temperature differ-
ence, the pump switches on at 100% speed for 10 s.Then, the speed is reduced to
the minimum pump speed value.
If the temperature difference reaches the adjusted set value, the pump speed in-
creases by one step (10%).The response of the controller can be adapted via the
parameter Rise. Each time the difference increases by the adjustable rise value, the
pump speed increases by 10 % until the maximum pump speed of 100% is reached.
If the temperature difference decreases by the adjustable rise value, pump speed
will be decreased by one step.
Note:
The set temperature difference must be at least 0.5 K [1 °Ra] higher than
the switch-on temperature difference.
Minimum speed
nMN
Speed control
Adjustment range: 30 … 100 %
Factory setting: 30 %
If ODB is activated: 50 %
A relative minimum pump speed can be allocated to the output R1 via the adjust-
ment channel nMN.
Note:
The pump speed must be set to 100% when auxiliary relays or valves are
connected.
Maximum store temperature
S MX
Maximum store temperature
Adjustment range: 4 … 95 °C [40 … 200 °F]
Factory setting: 60 °C [140 °F]
If the store temperature reaches the adjusted maximum temperature, the store will
no longer be loaded in order to avoid damage caused by overheating.A non-adjust-
able hysteresis of 2 K [4 °Ra] is set for the maximum store temperature.
If the maximum store temperature is exceeded, ☼is displayed.
Note:
If the collector cooling or the system cooling function is activated, the ad-
justed maximum store temperature may be exceeded. In order to prevent
system damage, the controller is also equipped with an integrated store
emergency shutdown, deactivating the system if the store reaches 95 °C
[200 °F].

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Installation Indications, functions and options MessagesCommissioningOperation and function
Store emergency shutdown
OSEM
Store emergency shutdown option
Adjustment range: ON, OFF
Factory setting: OFF
This option is used for activating the internal store emergency shutdown for an up-
per store sensor. If the temperature at the reference sensor exceeds 95°C [200 °F],
the store will be blocked and loading will be stopped until the temperature falls
below 90 °C [190 °F].
Note:
S3 is used as the reference sensor. .
Collector emergency shutdown
EM
Collector limit temperature
Adjustment range: 80 … 200 °C [170 … 390 °F]
Factory setting: 130 °C [270 °F]
When the collector temperature exceeds the adjusted collector limit tempera-
ture, the solar pump (R1) switches off in order to protect the system components
against overheating (collector emergency shutdown). If the collector limit temper-
ature is exceeded, ⚠is displayed (flashing).
Note:
If the drainback option ODB is activated, the adjustment range of EM is
changed to 80 … 120 °C [170 … 250 °F].The factory setting in that case is
95 °C [200 °F].
Cooling functions
In the following the 3 cooling functions – collector cooling, system cooling and store
cooling – are described in detail.The following note is valid for all 3 cooling functions:
Note:
The cooling functions will not become active as long as solar loading is
possible.
Collector cooling
OCC
Collector cooling option
Adjustment range: OFF / ON
Factory setting: OFF
CMX
Collector maximum temperature
Adjustment range: 70 … 160 °C [150 … 320 °F]
Factory setting: 110 °C [230 °F]
The collector cooling function keeps the collector temperature within the operat-
ing range by heating the store. If the store temperature reaches 95°C [200 °F] the
function will switch off for safety reasons.
If the store temperature exceeds the adjusted maximum store temperature, the
solar system is switched off. If the collector temperature increases to the adjusted
maximum collector temperature, the solar pump is activated until the collector
temperature falls below the maximum collector temperature. The store temper-
ature may then exceed the maximum temperature, but only up to 95°C [200 °F]
(emergency shutdown of the store).
If the collector cooling function is active, ⓵and ☼are displayed (flashing).
Note:
This function will only be available if the system cooling function (OSYC)
is deactivated.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
System cooling
OSYC
System cooling option
Adjustment range: OFF / ON
Factory setting: OFF
DTCO
Switch-on temperature difference
Adjustment range: 1.0 … 30.0 K
[2.0 … 60.0 °Ra]
Factory setting: 20.0 K [40.0 °Ra]
DTCF
Switch-off temperature difference
Adjustment range: 0.5 … 29.5 K [1.0 … 59.0 °Ra]
Factory setting: 15.0 K [30.0 °Ra]
The system cooling function aims to keep the solar system operational for a longer
time. The function overrides the maximum store temperature to provide thermal
relief of the collector field and the heat transfer fluid on hot days.
If the store temperature is higher than the adjusted maximum store temperature
and the switch-on temperature difference DTCO is reached, the solar pump re-
mains switched on or will be switched on. Solar loading is continued until either the
temperature difference falls below the adjusted value DTCF or the collector limit
temperature is reached.
If the system cooling function is active, ⓵and ☼are displayed (flashing).
Note:
This function will only be available, if the collector cooling function (OCC)
is deactivated.
Store cooling
OSTC
Store cooling option
Adjustment range: OFF / ON
Factory setting: OFF
OHOL
Holiday cooling option
Adjustment range: OFF / ON
Factory setting: OFF
THOL
Holiday cooling temperature
Adjustment range: 20 … 80 °C [70 … 175 °F]
Factory setting: 40 °C [110 °F]
When the store cooling function is activated, the controller aims to cool down the
store during the night in order to prepare it for solar loading on the following day.
If the adjusted maximum store temperature S MX is exceeded and the collector
temperature falls below the store temperature, the system will be reactivated in
order to cool down the store. Cooling will continue until the store temperature has
fallen below the adjusted maximum store temperature (S MX) again.A hysteresis of
2 K [4 °Ra] is set for the store cooling function.
Reference threshold temperature differences for the store cooling function are
DT O and DT F.
If no DHW consumption is expected for a longer period of time, the additional
holiday cooling option OHOL can be activated in order to extend the store cool-
ing function.The adjustable temperature THOL then replaces the maximum store
temperature (S MX) as the switch-off temperature for the store cooling function.
When the holiday cooling function is activated, ☼and ⚠(flashing) are shown on
the display.
If the holiday cooling function is active, ⓵, ☼and ⚠are displayed (flashing).

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Installation Indications, functions and options MessagesCommissioningOperation and function
Collector minimum limitation
OCN
Collector minimum limitation option
Adjustment range: OFF / ON
Factory setting: OFF
CMN
Minimum collector temperature
Adjustment range: 10.0 … 90.0 °C
[50.0 … 190.0 °F]
Factory setting: 10.0 °C [50.0 °F]
If the collector minimum limitation option is activated, the pump (R1) will only
be switched on if the adjustable collector minimum temperature is exceeded.The
minimum temperature prevents the pump from being switched on too often at low
collector temperatures.A hysteresis of 5 K [10 °Ra] is set for this function.
If the collector minimum limitation is active, ❄is displayed (flashing).
Note:
If OSTC or OCF is active, the collector minimum limitation will be over-
ridden. In that case, the collector temperature may fall below CMN.
Antifreeze function
OCF
Antifreeze option
Adjustment range: OFF / ON
Factory setting: OFF
CFR
Antifreeze temperature
Adjustment range: -40.0 … + 10.0 °C
[-40.0 … + 50.0 °F]
Factory setting: + 4.0 °C [+ 40.0 °F]
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 tem-
perature is exceeded by 1K [2 °Ra], the loading circuit will be deactivated.
If the antifreeze function is activated, ❄is displayed. If the antifreeze function is
active, ⓵and ❄are displayed (flashing).
Note:
Since this function uses the limited heat quantity of the store, the anti-
freeze function should only be used in regions with few days of tempera-
tures around the freezing point.
The antifreeze function will be suppressed if the store temperature falls
below +5°C [+40 °F] in order to protect the store from frost damage.
Heat quantity measurement
OHQM
Heat quantity measurement
Adjustment range: OFF / ON
Factory setting: OFF
FMAX
Flow rate in l/min
Adjustment range: 0.5 … 100.0
Factory setting: 6.0
MEDT
Heat transfer fluid
Adjustment range: 0 … 3
Factory setting: 1
MED%
Antifreeze concentration
in Vol-% (MED% is not indicated when
MEDT 0 or 3 is used.)
Adjustment range: 20 … 70 %
Factory setting: 45 %
If OHQM is activated, the heat quantity gained can be calculated and displayed. Heat
quantity measurement is possible if a flowmeter is used.
The heat quantity balancing (estimation) uses the difference between the flow and
return temperatures and the entered flow rate (at 100 % pump speed).
ÎRead the flow rate (l/min) and adjust it in the FMAX channel.
ÎAdjust the antifreeze type and concentration of the heat transfer fluid in the
channels MEDT and MED%.
Heat transfer fluid:
0: Water
1: Propylene glycol
2: Ethylene glycol
3: Tyfocor®LS / G-LS

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Drainback option
Note:
A drainback system requires additional components such as a holding
tank.The drainback option should only be activated if all components re-
quired are properly installed.
In a drainback system the heat transfer fluid will flow into a holding tank if solar
loading does not take place.The drainback option initiates the filling process if solar
loading is about to start. If the drainback option is activated, the following adjust-
ment can be made.
ODB
Drainback option
Adjustment range: OFF / ON
Factory setting: OFF
Note:
If the drainback option is activated, the cooling functions and the antifreeze
function will not be available. If one or more than one of these functions
have been activated before, they will be deactivated again as soon as ODB
is activated.They will remain deactivated, even if ODB is deactivated later
on.
Note:
If the drainback function ODB is activated, the factory settings of the
parameters nMN, DT O, DT F and DT S will be adapted to values suiting
drainback systems:
Additionally, the adjustment range and the factory setting of the collector
emergency shutdown will change. Adjustments previously made in these
channels will be overridden and have to be entered again if the drainback
option is deactivated later on.
Time period – switch-on condition
tDTO
Time period – switch-on condition
Adjustment range: 1 … 100 s
Factory setting: 60 s
The parameter tDTO is used for adjusting the time period during which the
switch-on condition must be permanently fulfilled.
Filling time
tFLL
Filling time
Adjustment range: 1.0 … 30.0 min
Factory setting: 5.0 min
The filling time can be adjusted using the parameter tFLL. During this period, the
pump runs at 100 % speed.
Stabilisation
tSTB
Stabilisation
Adjustment range: 1.0 … 15.0 min
Factory setting: 2.0 min
The parameter tSTB is used for adjusting the time period during which the switch-
off condition will be ignored after the filling time has ended.

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Installation Indications, functions and options MessagesCommissioningOperation and function
Operating mode
MAN
Operating mode
Adjustment range: OFF, Auto, ON
Factory setting: Auto
For control and service work, the operating mode of the relay can be manually ad-
justed. For this purpose, select the adjustment channel MAN in which the following
adjustments can be made:
Operating mode
OFF : Relais off ⚠(flashing) + ☛
Auto : Relay in automatic operation
ON : Relais on ⚠(flashing) + ☛+ ⓵
Note:
Always adjust the operating mode back to Auto when the control and
service work is completed. Normal operation is not possible in manual
mode.
HE pump control
ADA1
HE pump control via adapter
Adjustment range: ON, OFF
Factory setting: OFF
This option is used for controlling a high-efficiency pump via aVBus®/ PWM adapter.
The power supply of the pump is carried out via the semiconductor relay (R1). For
pump speed control with activated ADA1 option, the relay is switched on or off
(no burst control).Temperature dependent speed information is transmitted via the
VBus®.The relay will remain deactivated for 1 hour after its switch-off conditions
have been fulfilled (pump protection).
Language
LANG
Language selection
Selection: dE, En, Fr
Factory setting: dE
In this adjustment channel the menu language can be selected.
• dE : German
• En : English
• Fr : French
Unit
UNIT
Temperature unit selection
Selection: °F, °C
Factory setting: °C
In this adjustment channel, the display unit for temperatures and temperature differ-
ences can be selected.The unit can be switched between °C/ K and °F / °Ra during
operation.
Temperatures and temperature differences in °F and °Ra are displayed without
units. If the indication is set to °C, the units are displayed with the values.