REMEHA Sol Plus User manual

*11208356* 11208356
Thank you for buying this product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
Sol Plus
Manual
en
Solar controller with “SOLARFIRST” function and
“STEAMBACK®” safety function
Manual for the specialised craftsman
Installation
Operation
Functions and options
Troubleshooting

2
en
© 20160621
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 specied in this manual.
Improper use excludes all liability claims.
CE Declaration of conformity
The product complies with the relevant directives and is therefore
labelled with the CE mark. The Declaration of Conformity is available
upon request, please contact the manufacturer.
Note
Strong electromagnetic elds can impair the function of the controller.
ÎMake sure the controller as well as the system are not exposed to
strong electromagnetic elds.
Subject to technical change. Errors excepted.
Target group
These instructions are exclusively addressed to authorised skilled personnel.
Only qualied electricians should carry out electrical works.
Initial installation must be effected by the system owner or qualied 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 danger
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. Upon request we
will take back your old appliances bought from us and guarantee an environmen-
tally sound disposal of the devices.

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Contents
1 Overview .............................................................................................. 5
2 Installation ........................................................................................... 6
2.1 Mounting ........................................................................................................................6
2.2 Electrical connection ...................................................................................................6
2.3 PWM outputs................................................................................................................7
2.4 Data communication / Bus ..........................................................................................7
2.5 System overview...........................................................................................................7
2.6 Systems...........................................................................................................................9
3 Application examples........................................................................ 47
4 Operation and function .................................................................... 48
4.1 Buttons ........................................................................................................................ 48
5 System-Monitoring-Display .............................................................. 48
5.1 Flashing codes ............................................................................................................ 49
6 Commissioning.................................................................................. 50
7 Channel overview .............................................................................. 52
7.1 Display channels......................................................................................................... 52
7.2 Adjustment channels ................................................................................................ 55
8 Troubleshooting................................................................................. 66
9 Accessories ........................................................................................ 69
9.1 Sensors and measuring instruments ..................................................................... 70
9.2 VBus®accessories ..................................................................................................... 70
9.3 Interface adapters...................................................................................................... 70
10 Index ................................................................................................... 71

4
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Sol Plus solar controller
Sol Plus solar controller
The Sol Plus has been especially developed for the speed control of high-efciency
pumps in standard solar and heating systems. It is equipped with 2 PWM outputs.
Solar packages for DHW heating and heating backup with DeDietrich boilers:
The SOLAR Sol Plus with “SOLARFIRST” function (see page 47) and ModBus
controls a solar system with 1 collector eld and 1 store with integrated heat ex-
changer.The Sol Plus is designed for DHW heating and heating backup.
The Sol Plus controllers are equipped with the “SOLARFIRST” function via
ModBus and can be connected to DeDietrich boiler controllers by means of Mod-
Bus cables.
As soon as the solar control switches on, the system will be set to solar priority via
the connection to the boiler.
The set hot water temperature will be reduced (adjustable 0-30 K). This way, the
water will be heated by the solar system rst. If the solar system switches off, so-
lar priority will be stopped and the controller switches the boiler to its standard
adjustments.
Due to this function, the solar system can supply 20 % more heat for the store.
The “STEAMBACK” safety concept:
The Sol Plus controller is part of the “STEAMBACK” safety concept. If the col-
lector temperature reaches 130 °C, all functions will be deactivated. The uid in
the collector continues heating and will turn into vapour at 140°C. It will then be
pressed into the expansion vessel through extension.
The collector will not contain any solar uid then. There will be no steam ham-
mer - the solar uid will not be harmed. If the suns goes down and if the collector
temperature falls below 140 °C, the solar uid will condense and the pressure in
the expansion vessel will ll the collector again. Only if the collector temperature
falls below 100°C and that of the store below 60°C, will the controller activate
the solar system.
Whether holiday, power failure or fault - the DeDietrich “STEAMBACK” safety
function protects your solar system and makes it maintenance-free and durable.
The Sol Plus solar controller is used for controlling a solar system with 1 store with
integrated heat exchanger and one 3-port valve for return preheating. It can also
control a solar system with 1 store with 2 integrated heat exchangers via a 3-port
valve.The Sol Plus is designed for DHW heating and heating backup in solar thermal
systems connected in series.
It can be directly mounted onto the pump station. For using several functions such
as store base/top or combined store with return preheating,the controller can also
control a 3-port valve in addition to the solar circuit pump.The parameter Arr can
be used for selecting the system conguration.

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1 Overview
• Especially designed for the speed control of high-efciency pumps
• System-Monitoring-Display
• Up to 4 Pt1000 temperature sensors
• 2 semiconductor relays for pump speed control
• HE pump control
• Heat quantity measurement
• Commissioning menu
• 10 basic systems to choose from
• Function control
• Optional thermal disinfection function
• Drainback option
• Unit °F and °C selectable
• “SOLARFIRST” function
Technical data
Inputs: 4 Pt1000 temperature sensors
Outputs: 2 semiconductor relays, 2 PWM outputs
PWM frequency: 512 Hz
PWM voltage: 10.5 V
Switching capacity per relay:
R1: 1 (1) A 100 …240 V~ (semiconductor relays)
R2: 1 (1) A 100 …240 V~ (semiconductor relays)
Total switching capacity: 2 A 240 V~
Power supply: 100 … 240 V~, 50 … 60 Hz
Supply connection: type Y attachment
Power consumption (standby): < 1 W
Mode of operation: type 1.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: VBus®, ModBus switching signal for the “SOLARFIRST” function
VBus®current supply: 35 mA
Functions: function control, operating hours counter, tube collector function,
thermostat function, speed control, drainback and booster option, heat quantity
measurement
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
Operation: 3 push buttons at the front
Protection type: IP 20 / EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C [32 … 104 °F]
Degree of pollution: 2
Dimensions: 172 x 110 x 46 mm
110
30
62
172
46
130
Upper fastening
Lower fastening

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6
Installation Indications, functions and options MessagesCommissioningOperation 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 elds can impair the function of the controller.
ÎMake sure the controller as well as the system are not exposed to
strong electromagnetic elds.
The unit 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
chapter 2.2).
ÎPut the cover on the housing.
ÎAttach with the fastening screw.
display
cable conduits with
strain relief
cover button
fuse T4A
2.2 Electrical connection
WARNING! ESD damage!
Electrostatic discharge can lead to damage to electronic compo-
nents!
ÎTake care to discharge properly before touching the
inside of the device!
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply be-
fore opening the housing!
Note
The mains connection must be carried out with the common ground of
the building to which the pipework of the solar circuit is connected.
Note
Connecting the device to the power supply must always be the last step
of the installation!
Note
The pump speed must be set to 100% when auxiliary relays or valves are
connected.

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7
InstallationIndications, functions and optionsMessages Commissioning Operation and function
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
LN
R1
N
2019
18
171615
14131212
NR2
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
S2S1 S3 S4 VBus
PWM 1/2
ModBus
345678910
F-67580 Mertzwiller
DDTh Sol Plus
Article/Artikel 7630422
Soft version 2.00
Serial number
IP 20
The power supply of the device must be 100 … 240 V~ (50 … 60 Hz). Attach exible
cables 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 Relay 2
18 = Conductor R1 16 = Conductor R2
17 = Neutral conductor N 15 = Neutral conductor N
13 = Protective earth conductorr ⏚14 = Protective earth conductorr ⏚
The mains connection is at the following terminals:
19 = Neutral conductor N
20 = Conductor L
12 = Protective earth conductor ⏚
Connect the temperature sensors (S1 to S4) to the corresponding terminals
with either polarity:
1 / 2 = Sensor 1 (e. g. collector sensor 1)
3 / 4 = Sensor 2 (e. g. store sensor 1)
5 / 6 = Sensor 3 (e. g. store sensor top)
7 / 8 = Sensor 4 (e. g. return sensor)
Fuse
VBus®
ModBus
connection
PWM
connection
mains
terminals
load terminals
sensor terminals protective earth
conductor terminal
2.3 PWM outputs
Speed control of a HE pump is possible via a PWM signal.The pump has to be con-
nected to the relay as well as to one of the PWM outputs of the controller. Power
is supplied to the HE pump by switching the corresponding relay on or off.
The terminals marked PWM 1 / 2 are control outputs for pumps with PWM con-
trol input.
2 4
1 3
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
LN
R1
N
2019
18
171615
14131212
NR2
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
S2S1 S3 S4 VBus
PWM 1/2
ModBus
345678910
F-67580 Mertzwiller
DDTh Sol Plus
Article/Artikel 7630422
Soft version 2.00
Serial number
IP 20
1 = PWM output 1, control signal
2 = PWM output 1, GND
3 = PWM output 2, GND
4 = PWM output 2, control signal
2 4
1 3
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
LN
R1
N
2019
18
171615
14131212
NR2
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
S2S1 S3 S4 VBus
PWM 1/2
ModBus
345678910
F-67580 Mertzwiller
DDTh Sol Plus
Article/Artikel 7630422
Soft version 2.00
Serial number
IP 20
1 = ModBus A
2 = GND
3 = free
4 = ModBus B
ModBus = Optional (for connection to the boiler (if provided by the boiler))
2.4 Data communication / Bus
The controller is equipped with the VBus®for data transfer and energy supply
to external modules.The connection is to be carried out at the terminals marked
VBus (either polarity).
One or more VBus®modules can be connected via this data bus, such as:
• DL2 Datalogger
• DL3 Datalogger
Furthermore, the controller can be connected to a PC or integrated into a network
via the VBus®/USB or VBus®/LAN interface adapter (not included).
Note
More accessories on page 69.

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1
Standard solar system (page 9)
2
Solar system with heat exchange
(page 12)
3
Solar system with backup heating
(page 18)
4
Solar system with store loading in
layers (page 23)
5
Solar system with 2 stores and valve
logic (page 26)
6
Solar system with 2 stores and pump
logic (page 29)
7
Solar system with east-/west collectors
and 1 store (page 32)
8
Solar system with backup heating by
solid fuel boiler (page 35)
9
Solar system with heating circuit
return preheating (page 41)
10
Standard solar system with heat dump
(page 44)
2.5 System overview

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
2.6 Systems
910
VBus
PWM 1/2
ModBus
S1
S2
S4 / TR
R1
S3 / TSTT
S1
S3
S2
R1 R2
exemplary
drainback system layout
(with booster pump)
Arrangement 1: Standard solar system
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 relay
1, and the store will be loaded until the switch-off temperature difference (DT F) or
the maximum store temperature (S MX) is reached.
Sensors S3 and S4 can optionally be connected. S3 can optionally be used as the
reference sensor for the store emergency shutdown option (OSEM).
If heat quantity measurement (OHQM) is activated, S4 is used as the return sensor.
If the drainback option (ODB) is activated, relay 2 can be used for activating a
booster pump. For this purpose, the booster function (OBST) has to be activated.

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Installation Indications, functions and options MessagesCommissioningOperation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 52
FLL x* ODB lling time active - 52
STAB x* ODB stabilisation in progress - 52
COL x Temperature collector S1 53
TST x Temperature store S2 53
S3 x Temperature sensor 3 S3 53
TSTT x* Temperature store top S3 53
S4 x Temperature sensor 4 S4 53
n % x Speed R1 R1 54
hP x Operating hours R1 R1 55
hP1 x* Operating hours R1 (if OBST is activated) R1 55
hP2 x* Operating hours R2 (if OBST is activated) R2 55
kWh x* Heat quantity in kWh - 54
MWh x* Heat quantity in MWh - 54
TIME x Time - 55
Adjustment channels
Channel Description Factory setting Page
Arr x System 1 55
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 56
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 56
DT S x Set temperature difference R1 10.0 K [20.0 °Ra] 56
RIS x Rise R1 2 K [4 °Ra] 56
PUM1 x Pump control type R1 PSOL 56
nMN x Minimum speed R1 30 % 57
nMX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 75 °C [167 °F] 57
OSEM x Store emergency shutdown option OFF 57
EM x Collector emergency temperature 130 °C [270 °F] 58
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 58
OCC x Collector cooling option OFF 58
CMX x* Maximum collector temperature 110 °C [230 °F] 58
OSYC x System cooling option OFF 59

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Adjustment channels
Channel Description Factory setting Page
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0 °Ra] 59
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0 °Ra] 59
OSTC x Store cooling option OFF 59
OHOL x* Holiday cooling option OFF 59
THOL x* Holiday cooling temperature 40 °C [110 °F] 59
OCN x Collector minimum limitation option OFF 60
CMN x* Collector minimum temperature 10 °C [50 °F] 60
OCF x Antifreeze option OFF 60
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 60
OTC x Tube collector option OFF 62
TCST x* OTC starting time 07:00 62
TCEN x* OTC ending time 19:00 62
TCRU x* OTC runtime 30 s 62
TCIN x* OTC standstill interval 30 min 62
OHQM x Heat quantity measurement option OFF 62
FMAX x* Maximum ow rate 6.0 l/min 63
MEDT x* Antifreeze type 1 63
MED% x* Antifreeze concentration (only if MEDT = propylene or ethylene glycol) 45 % 63
ODB x Drainback option OFF 63
tDTO x* ODB switch-on condition - time period 60 s 64
tFLL x* ODB lling time 5.0 min 64
tSTB x* ODB stabilisation time 2.0 min 64
OBST s* Option booster function OFF 64
MAN1 x Manual mode R1 Auto 64
MAN2 x Manual mode R2 Auto 64
MB x ModBus slave address 60 65
LANG x Language dE 65
UNIT x Temperature unit °C 65
RESE x Reset - back to factory settings 65
######## Version number
Legend:
Symbol Description
x Channel is available
x* Channel is available, if the corresponding option is activated.
s* System-specic channel, only available if the corresponding option is activated

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Installation Indications, functions and options MessagesCommissioningOperation and function
Arrangement 2: Solar system with heat exchange
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 relay
1, and the store will be loaded until the switch-off temperature difference (DT F) or
the maximum store temperature (S MX) is reached.
Heat exchange from store 1 to store 2 will be operated by relay 2, if the tempera-
ture difference between sensors S3 and S4 is larger than or identical to the adjusted
switch-on temperature difference (DT3O), until the adjusted minimum (MN3O)
and maximum (MX3O) temperature thresholds of the respective store are reached.
S3 can optionally be used as the reference sensor for the store emergency shut-
down option (OSEM).
910
VBus
PWM 1/2
ModBus
R2
S1
S3 / TSTT
S4
R1
S2
Store 1 Store 2

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 52
FLL x* ODB lling time active - 52
STAB x* ODB stabilisation in progress - 52
COL x Temperature collector S1 53
TST1 x Temperature store 1 base S2 53
TSTT x Temperature store 1 top S3 53
TST2 x Temperature store 2 base S4 53
n1 % x Speed R1 R1 54
n2 % x Speed R2 R2 54
h P1 x Operating hours R1 R1 55
h P2 x Operating hours R2 R2 55
kWh x* Heat quantity in kWh - 54
MWh x* Heat quantity in MWh - 54
TIME x Time - 55
Adjustment channels
Channel Description Factory setting Page
Arr x System 2 55
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 56
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 56
DT S x Set temperature difference R1 10.0 K [20.0°Ra] 56
RIS x Rise R1 2 K [4 °Ra] 56
PUM1 x Pump control type R1 PSOL 56
n1MN x Minimum speed R1 30 % 57
n1MX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 75 °C [167 °F] 57
OSEM x Store emergency shutdown option OFF 57
PUM2 x Pump control type R2 OnOF 56
n2MN x* Minimum speed R2 30 % 57
n2MX x* Maximum speed R2 100 % 57
EM x Collector emergency temperature 130 °C [270 °F] 58
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 58
OCC x Collector cooling option OFF 58
CMX x* Maximum collector temperature 110 °C [230 °F] 58
OSYC x System cooling option OFF 59
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0°Ra] 59
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0°Ra] 59
OSTC x Store cooling option OFF 59
OHOL x* Holiday cooling option OFF 59

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Installation Indications, functions and options MessagesCommissioningOperation and function
Legend:
Symbol Description
x Channel is available
x* Channel is available, if the corresponding option is activated.
sSystem-specic channel
Adjustment channels
Channel Description Factory setting Page
THOL x* Holiday cooling temperature 40 °C [110 °F] 59
OCN x Collector minimum limitation option OFF 60
CMN x* Collector minimum temperature 10 °C [50 °F] 60
OCF x Antifreeze option OFF 60
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 60
OTC x Tube collector option OFF 62
TCST x* OTC starting time 07:00 62
TCEN x* OTC ending time 19:00 62
TCRU x* OTC runtime 30 s 62
TCIN x* OTC standstill interval 30 min 62
DT3O s Switch-on temperature difference R2 6.0 K [12.0 °Ra] 56
DT3F s Switch-off temperature difference R2 4.0 K [8.0 °Ra] 56
DT3S s Set temperature difference R2 10.0 K [20.0 °Ra] 56
RIS3 s Rise R2 2 K [4 °Ra] 56
MX3O s Switch-on threshold for maximum temperature 60.0 °C [140.0 °F] 40
MX3F s Switch-off threshold for maximum temperature 58.0 °C [136.0 °F] 40
MN3O s Switch-on threshold for minimum temperature 5.0 °C [40.0 °F] 40
MN3F s Switch-off threshold for minimum temperature 10.0 °C [50.0 °F] 40
ODB x Drainback option OFF 63
tDTO x* ODB switch-on condition - time period 60 s 64
tFLL x* ODB lling time 5.0 min 64
tSTB x* ODB stabilisation time 2.0 min 64
MAN1 x Manual mode R1 Auto 64
MAN2 x Manual mode R2 Auto 64
MB x ModBus slave address 60 65
LANG x Language dE 65
UNIT x Temperature unit °C 65
RESE x Reset - back to factory settings 65
######## Version number

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
System-specic functions
The following adjustments are used for the specic functions in system 2.
∆T control for the heat exchange between 2 stores
DT3O
Switch-on temperature difference
Adjustment range: 1.0 … 20.0 K [2.0 … 40.0°Ra]
Factory setting: 6.0 K [12.0 °Ra]
DT3F
Switch-off temperature difference
Adjustment range: 0.5 … 19.5 K [1.0 … 39.0°Ra]
Factory setting: 4.0 K [8.0 °Ra]
S3 and S4 are used as the reference sensors for this function.
In system 2 the controller is equipped with an additional differential control for heat
exchange between two stores.The basic differential function is adjusted using the
switch-on (DT3O) and switch-off (DT3F) temperature differences.
When the temperature difference exceeds the adjusted switch-on temperature
difference, relay 2 switches on. When the temperature difference falls below the
adjusted switch-off temperature difference, relay 2 switches off.
Note
The switch-on temperature difference must be at least 0.5 K [1°Ra] high-
er than the switch-off temperature difference.
Speed control
DT3S
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 of the heat exchange pump, the operating mode
of relay 2 must be set to Auto in the adjustment channel MAN2.
RIS3
Rise
Adjustment range: 1 … 20 K [2 … 40 °Ra]
Factory setting: 2 K [4 °Ra]
If the switch-on difference is reached, the pump switches on at full speed for 10 s.
Then, the speed is reduced to the minimum pump speed value (n2MN).
If the temperature difference reaches the adjusted set value (DT3S), the pump
speed increases by one step (10%). Each time the difference increases by the adjust-
able rise value RIS3, the pump speed increases by 10 % until the maximum pump
speed of 100% is reached.
Note
The set temperature difference must be at least 0.5 K [1 °Ra] higher than
the switch-on temperature difference.

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Installation Indications, functions and options MessagesCommissioningOperation and function
PUM2
Pump control type R2
Selection: OnOF, PULS, PSOL, PHEA
Factory setting: OnOF
With this parameter, the pump control type can be adjusted.The following types
can be selected:
Adjustment for standard pump without speed control
• OnOF (pump on / pump off)
Adjustment for standard pump with speed control
• PULS (burst control via semiconductor relay)
Adjustment for high-efciency pump (HE pump)
• PSOL (PWM prole for a HE solar pump)
• PHEA (PWM prole for a HE heating pump)
n2MN
Minimum speed R2
Adjustment range: (10) 30 … 100 %
Factory setting: 30 %
A relative minimum pump speed can be allocated to the output R2 via the adjust-
ment channel n2MN.
Note
The pump speed must be set to 100% when auxiliary relays or valves are
connected.
n2MX
Maximum speed R2
Adjustment range: (10) 30 … 100 %
Factory setting: 100 %
In the adjustment channel n2MX a relative maximum speed for a pump connected
can be allocated to the output R2.
Note
The pump speed must be set to 100% when auxiliary relays or valves are
connected.

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Maximum temperature limitation heat exchange
MX3O / MX3F
Maximum temperature limitation
Adjustment range: 0.0 … 95.0 °C [30.0 … 200.0 °F]
Factory setting:
MX3O: 60.0 °C [140.0 °F]
MX3F: 58.0 °C [136.0 °F]
S4 is used as the reference sensor for the maximum temperature limi-
tation.
The maximum temperature limitation function provides a maximum temperature
setting, usually to reduce scald risk in a store. If MX3O is exceeded, relay 2 is
switched off until the temperature at sensor 4 falls below MX3F.
Minimum temperature limitation heat exchange
MN3O / MN3F
Minimum temperature limitation
Adjustment range: 0.0 … 90.0 °C [30.0 … 190.0 °F]
Factory setting (only if Arr = 2):
MN3O: 5.0 °C [40.0 °F]
MN3F: 10.0 °C [50.0 °F]
S3 is used as the reference sensor for the minimum temperature limi-
tation.
The minimum temperature limitation function provides a minimum temperature
setting for the heat source in system 2. If the temperature at sensor 3 falls below
MN3O, relay 2 is switched off until the temperature at sensor 3 exceeds MN3F.
Both switch-on and switch-off temperature differences DT3O and DT3F are valid
for the maximum and minimum temperature limitation.

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Installation Indications, functions and options MessagesCommissioningOperation and function
Arrangement 3: Solar system with backup heating
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 relay
1, and the store will be loaded until the switch-off temperature difference (DT F) or
the maximum store temperature (S MX) is reached.
Sensor S3 is used for a thermostat function, which operates relay 2 for backup
heating or heat dump purposes, when the adjusted thermostat switch-on tempera-
ture (AH O) is reached.This function can optionally be combined with up to three
adjustable time frames.
Sensor S3 can optionally be used as the reference sensor for the thermal disinfec-
tion function (OTD) or the store emergency shutdown option (OSEM).
Sensor S4 can optionally be connected. If heat quantity measurement (OHQM) is
activated, S4 is used as the return sensor.
VBus
910
PWM 1/2
ModBus
R2
S1
S2
R1
S3 / TSTT
S4 / TR

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 52
FLL x* ODB lling time active - 52
STAB x* ODB stabilisation in progress - 52
COL x Temperature collector S1 53
TSTB x Temperature store 1 base S2 53
TSTT x Temperature store 1 top S3 53
TDIS s* Thermal disinfection temperature (thermal disinfection) S3 53
S4 x Temperature sensor 4 S4 53
n1 % x Speed R1 R1 54
h P1 x Operating hours R1 R1 55
h P2 x Operating hours R2 R2 55
kWh x* Heat quantity in kWh - 54
MWh x* Heat quantity in MWh - 54
CDIS s* Countdown of monitoring period (thermal disinfection) - 54
SDIS s* Starting time display (thermal disinfection) - 54
DDIS s* Heating period display (thermal disinfection) - 54
TIME x Time - 55
Adjustment channels
Channel Description Factory setting Page
Arr x System 3 55
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 56
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 56
DT S x Set temperature difference R1 10.0 K [20.0°Ra] 56
RIS x Rise R1 2 K [4 °Ra] 56
PUM1 x Pump control type R1 PSOL 56
n1MN x Minimum speed R1 30 % 57
n1MX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 75 °C [167 °F] 57
OSEM x Store emergency shutdown option OFF 57
EM x Collector emergency temperature 130 °C [270 °F] 58
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 58
OCC x Collector cooling option OFF 58
CMX x* Maximum collector temperature 110 °C [230 °F] 58
OSYC x System cooling option OFF 59
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0°Ra] 59
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0°Ra] 59
OSTC x Store cooling option OFF 59
OHOL x* Holiday cooling option OFF 59
THOL x* Holiday cooling temperature 40 °C [110 °F] 59
OCN x Collector minimum limitation option OFF 60

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Installation Indications, functions and options MessagesCommissioningOperation and function
Adjustment channels
Channel Description Factory setting Page
CMN x* Collector minimum temperature 10 °C [50 °F] 60
OCF x Antifreeze option OFF 60
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 60
OTC x Tube collector option OFF 62
TCST x* OTC starting time 07:00 62
TCEN x* OTC ending time 19:00 62
TCRU x* OTC runtime 30 s 62
TCIN x* OTC standstill interval 30 min 62
OHQM x Heat quantity measurement option OFF 62
FMAX x* Maximum ow rate 6.0 l/min 63
MEDT x* Antifreeze type 1 63
MED% x* Antifreeze concentration 45 % 63
AH O s Switch-on temperature for thermostat 40 °C [110 °F] 21
AH F s Switch-off temperature for thermostat 45 °C [120 °F] 21
t1 O s Thermostat switch-on time 1 00:00 21
t1 F s Thermostat switch-off time 1 00:00 21
t2 O s Thermostat switch-on time 2 00:00 21
t2 F s Thermostat switch-off time 2 00:00 21
t3 O s Thermostat switch-on time 3 00:00 21
t3 F s Thermostat switch-off time 3 00:00 21
ODB x Drainback option OFF 63
tDTO x* ODB switch-on condition - time period 60 s 64
tFLL x* ODB lling time 5.0 min 64
tSTB x* ODB stabilisation time 2.0 min 64
OTD s Thermal disinfection option OFF 22
PDIS s* Monitoring period 01:00 22
DDIS s* Heating period 01:00 22
TDIS s* Disinfection temperature 60 °C [140 °F] 22
SDIS s* Starting time 00:00 22
MAN1 x Manual mode R1 Auto 64
MAN2 x Manual mode R2 Auto 64
MB x ModBus slave address 60 65
LANG x Language dE 65
UNIT x Temperature unit °C 65
RESE x Reset - back to factory settings 65
######## Version number
Legend:
Symbol Description
x Channel is available
x* Channel is available, if the corresponding option is activated.
sSystem-specic channel
s* System-specic channel, only available if the corresponding option is activated