Resol DeltaSol CS Plus bidirectional User manual

*11210333* 11210333
Thank you for buying this RESOL product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
DeltaSol®CS Plus bidirectional
www.resol.com
Manual
en
Solar controller
Manual for the
specialised craftsman
Installation
Operation
Functions and options
Troubleshooting
beginning with version 2.00
The Internet portal for easy and secure access to
your system data – www.vbus.net

2
en
© 20151030_11210333_DeltaSol_CS_Plus_bidirektional.monen.indd
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
labelled with the CE mark. The Declaration of Conformity is available
upon request, please contact RESOL.
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.
Subject to technical change. Errors excepted.
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 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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DeltaSol®CS Plus bidirectional Solar controller
The DeltaSol®CS Plus bidirectional has been especially developed for the speed
control of high-efficiency pumps in standard solar and heating systems.
It is equipped with two PWM outputs and an additional input for a VFD Grundfos
Direct SensorTM that enables a precise heat quantity measurement.
Contents
1 Overview .............................................................................................. 4
2 Installation ........................................................................................... 5
2.1 Mounting ........................................................................................................................5
2.2 Electrical connection ...................................................................................................5
2.3 VFD Grundfos Direct Sensor™...............................................................................6
2.4 PWM interfaces............................................................................................................6
2.5 Data communication / Bus ..........................................................................................6
2.6 System overview...........................................................................................................7
2.7 Systems...........................................................................................................................8
3 Operation and function .................................................................... 46
3.1 Buttons ........................................................................................................................ 46
4 System-Monitoring-Display .............................................................. 46
4.1 Flashing codes ............................................................................................................ 47
5 Commissioning.................................................................................. 48
6 Channel overview .............................................................................. 50
6.1 Display channels......................................................................................................... 50
6.2 Adjustment channels ................................................................................................ 54
7 Troubleshooting................................................................................. 66
8 Accessories ........................................................................................ 69
8.1 Sensors and measuring instruments ..................................................................... 70
8.2 VBus®accessories ..................................................................................................... 70
8.3 Interface adapters...................................................................................................... 70
9 Index ................................................................................................... 71
The DeltaSol®CS Plus bidirectional has 2 PWM feedback inputs and a status
display for a bidirectional pump.

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1 Overview
• For the speed control of high-efficiency pumps
• Status display for a bidirectional HE pump
• Especially suited for solar pump stations
• 2 PWM feedback inputs
• 1 input for aVFD Grundfos Direct SensorTM
• Heat quantity measurement
• Commissioning menu
• 10 basic systems to choose from
• Function control
• Optional thermal disinfection function
• Drainback option
Technical data
Inputs: 4 Pt1000 temperature sensors, 1 VFD Grundfos Direct SensorTM, 2 PWM
feedback inputs
Outputs: 2 semiconductor relays, 2 PWM outputs
PWM frequency: 512 Hz
PWM voltage: 10.5 V
Switching capacity: 1 (1) A 240 V~ (semiconductor relay)
Total switching capacity: 2 A 240 V~
Power supply: 100 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: 0.61 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: function control, operating hours counter, tube collector function,
thermostat function, speed control and 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 buttons at the front of the housing
Protection type: IP 20 /DIN EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C
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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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 device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic fields.
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 T2A
2.2 Electrical connection
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the device from power supply be-
fore 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 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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Installation Indications, functions and options MessagesCommissioningOperation and function
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 device must be 100… 240V~ (50 … 60 Hz).Attach flexible
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
18 = Conductor R1
17 = Neutral conductor N
13 = Protective earth conductor ⏚
Relay 2
16 = Conductor R2
15 = Neutral conductor N
14 = Protective earth conductor ⏚
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®mains
terminals
load terminals
sensor terminals protective earth
conductor terminal
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
LN
R1
N
2019
18
171615
14131212
NR2
IP 20
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
S2S1 S3 S4 VBus
PWM 2
PWM 1
VFD
Made in Germany
DeltaSol®CS Plus bidirektional
345678910
2.3 VFD Grundfos Direct Sensor™
The controller is equipped with 1 input for a digital VFD Grundfos Direct Sensor™
for measuring the flow rate and the temperature. Connection is made at the VFD
terminal (bottom left).
2.4 PWM interfaces
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 and 2 are interfaces for bidirectional HE pumps.
2 4
1 3
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
LN
R1
N
2019
18
17161514131212
NR2
IP 20
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
S2S1 S3 S4 VBus
PWM 2
PWM 1
VFD
Made in Germany
DeltaSol®CS Plus bidirektional
345678910
PWM1:
1 = PWM output 1, control signal
2 = PWM output 1, GND
3 = PWM input 1, feedback signal
4 = not assigned
PWM2:
1 = PWM output 2, control signal
2 = PWM output 2, GND
3 = PWM input 2, feedback signal
4 = not assigned
2.5 Data communication / Bus
The controller is equipped with the RESOL 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 RESOLVBus®modules can be connected via this data bus, such as:
• DL2 / DL3 Datalogger
• KM1 Communication module
Furthermore, the controller can be connected to a PC or integrated into a network
via the RESOL VBus®/USB or VBus®/LAN interface adapter (not included). Differ-
ent solutions for visualisation and remote parameterisation are available on the
RESOL website www.resol.com.
Note
More accessories on page 69.

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1
Standard solar system (page 8)
2
Solar system with heat exchange
(page 11)
3
Solar system with backup heating
(page 17)
4
Solar system with store loading in
layers (page 22)
5
Solar system with 2 stores and valve
logic (page 25)
6
Solar system with 2 stores and pump
logic (page 28)
7
Solar system with east-/west collectors
and 1 store (page 31)
8
Solar system with backup heating by
solid fuel boiler (page 34)
9
Solar system with heating circuit
return preheating (page 40)
10
Standard solar system with heat dump
(page 43)
2.6 System overview

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Installation Indications, functions and options MessagesCommissioningOperation and function
2.7 Systems
PWM 2
PWM 1
VFD
LN
R1
N
2019
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171615
141312
12
NR2
S2S1 S3 S4 VBus
345678910
S1
S2
S4 / VFD / TR
S4 / VFD / TFL
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 the heat qunatity measurement option (OHQM) is activated,S1, S4 orVFD can be
used for measuring the temperature (see table on p. 63).
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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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 50
FLL x* ODB filling time active - 50
STAB x* ODB stabilisation in progress - 50
COL x Temperature collector S1 51
TST x Temperature store S2 51
S3 x Temperature sensor 3 S3 51
TSTT x* Temperature store top S3 51
S4 x Temperature sensor 4 S4 51
TFL x* Temperature flow sensor S1 / S4 / VFD 51
TR x* Temperature return sensor S4 / VFD 51
VFD x* Temperature Grundfos Direct Sensor™ VFD 51
L/h x* Flow rate Grundfos Direct Sensor™/ PWM feedback signal VFD / PWM1 52
n % x Speed R1 R1 52
hP x Operating hours R1 R1 53
hP1 x* Operating hours R1 (if OBST is activated) R1 53
hP2 x* Operating hours R2 (if OBST is activated) R2 53
kWh x* Heat quantity in kWh - 52
MWh x* Heat quantity in MWh - 52
TIME x Time - 53
Adjustment channels
Channel Description Factory setting Page
Arr x System 1 54
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 54
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 54
DT S x Set temperature difference R1 10.0 K [20.0 °Ra] 54
RIS x Rise R1 2 K [4 °Ra] 55
PUM1 x Pump control type R1 PSOL 55
nMN x Minimum speed R1 30 % 55
nMX x Maximum speed R1 100 % 55
PFB1 x* PWM feedback signal input 1 OFF 56
S MX x Maximum store temperature 60 °C [140 °F] 56
OSEM x Store emergency shutdown option OFF 56
EM x Collector emergency temperature 130 °C [270 °F] 57
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 57
OCC x Collector cooling option OFF 57
CMX x* Maximum collector temperature 110 °C [230 °F] 57
OSYC x System cooling option OFF 58

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Installation Indications, functions and options MessagesCommissioningOperation and function
Adjustment channels
Channel Description Factory setting Page
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0 °Ra] 58
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0 °Ra] 58
OSTC x Store cooling option OFF 58
OHOL x* Holiday cooling option OFF 58
THOL x* Holiday cooling temperature 40 °C [110 °F] 58
OCN x Collector minimum limitation option OFF 59
CMN x* Collector minimum temperature 10 °C [50 °F] 59
OCF x Antifreeze option OFF 59
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 59
OTC x Tube collector option OFF 60
TCST x* OTC starting time 07:00 60
TCEN x* OTC ending time 19:00 61
TCRU x* OTC runtime 30 s 61
TCIN x* OTC standstill interval 30 min 61
GFD x Grundfos Direct Sensor™ OFF 61
OHQM x Heat quantity measurement option OFF 61
SEN x* VFD allocation 2 62
FMAX x* Maximum flow rate 6.0 l/min 62
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 filling 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
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-specific channel, only available if the corresponding option is activated

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InstallationIndications, functions and optionsMessages Commissioning Operation 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 stores are reached. S3
can optionally be used as the reference sensor for the store emergency shutdown
option (OSEM). If the heat quantity measurement option (OHQM) is activated, S1 or
VFD can be used for measuring the temperature (see table on p. 63).
PWM 2
PWM 1
VFD LN
R1
N
2019
18
171615
141312
12
NR2
S2S1 S3 S4 VBus
345678910
R2
S1
S3 /TSTT
S4
R1
VFD / TR
S2
Store 1 Store 2

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Installation Indications, functions and options MessagesCommissioningOperation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 50
FLL x* ODB filling time active - 50
STAB x* ODB stabilisation in progress - 50
COL x Temperature collector S1 51
TST1 x Temperature store 1 base S2 51
TSTT x Temperature store 1 top S3 51
TST2 x Temperature store 2 base S4 51
TFL x* Temperature flow sensor S1 51
TR x* Temperature return sensor VFD 51
VFD x* Temperature Grundfos Direct Sensor™ VFD 51
L/h x* Flow rate Grundfos Direct Sensor™/ PWM feedback signal VFD / PWM1 52
n1 % x Speed R1 R1 52
n2 % x Speed R2 R2 52
h P1 x Operating hours R1 R1 53
h P2 x Operating hours R2 R2 53
kWh x* Heat quantity in kWh - 52
MWh x* Heat quantity in MWh - 52
TIME x Time - 53
Adjustment channels
Channel Description Factory setting Page
Arr x System 2 54
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 54
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 54
DT S x Set temperature difference R1 10.0 K [20.0°Ra] 54
RIS x Rise R1 2 K [4 °Ra] 55
PUM1 x Pump control type R1 PSOL 55
n1MN x Minimum speed R1 30 % 55
n1MX x Maximum speed R1 100 % 55
PFB1 x* PWM feedback signal input 1 OFF 56
S MX x Maximum store temperature 60 °C [140 °F] 56
OSEM x Store emergency shutdown option OFF 56
PUM2 x Pump control type R2 OnOF 55
n2MN x* Minimum speed R2 30 % 55
n2MX x* Maximum speed R2 100 % 55
EM x Collector emergency temperature 130 °C [270 °F] 57
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 57
OCC x Collector cooling option OFF 57
CMX x* Maximum collector temperature 110 °C [230 °F] 57
OSYC x System cooling option OFF 58
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0 °Ra] 58
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0 °Ra] 58

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Legend:
Symbol Description
x Channel is available
x* Channel is available, if the corresponding option is activated.
s System-specific channel
Adjustment channels
Channel Description Factory setting Page
OSTC x Store cooling option OFF 58
OHOL x* Holiday cooling option OFF 58
THOL x* Holiday cooling temperature 40 °C [110 °F] 58
OCN x Collector minimum limitation option OFF 59
CMN x* Collector minimum temperature 10 °C [50 °F] 59
OCF x Antifreeze option OFF 59
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 59
OTC x Tube collector option OFF 60
TCST x* OTC starting time 07:00 60
TCEN x* OTC ending time 19:00 61
TCRU x* OTC runtime 30 s 61
TCIN x* OTC standstill interval 30 min 61
GFD x Grundfos Direct Sensor™ OFF 61
OHQM x Heat quantity measurement option OFF 61
MEDT x* Antifreeze type 1 63
MED% x* Antifreeze concentration (only if MEDT = propylene or ethylene glycol) 45 % 63
DT3O s Switch-on temperature difference R2 6.0 K [12.0 °Ra] 54
DT3F s Switch-off temperature difference R2 4.0 K [8.0 °Ra] 54
DT3S s Set temperature difference R2 10.0 K [20.0 °Ra] 54
RIS3 s Rise R2 2 K [4 °Ra] 55
MX3O s Switch-on threshold for maximum temperature 60.0 °C [140.0 °F] 39
MX3F s Switch-off threshold for maximum temperature 58.0 °C [136.0 °F] 39
MN3O s Switch-on threshold for minimum temperature 5.0 °C [40.0 °F] 39
MN3F s Switch-off threshold for minimum temperature 10.0 °C [50.0 °F] 39
ODB x Drainback option OFF 63
tDTO x* ODB switch-on condition - time period 60 s 64
tFLL x* ODB filling 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
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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Installation Indications, functions and options MessagesCommissioningOperation and function
System-specific functions
The following adjustments are used for the specific 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 ad-
justable 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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InstallationIndications, functions and optionsMessages Commissioning Operation 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-efficiency pump (HE pump)
• PSOL (PWM profile for a HE solar pump)
• PHEA (PWM profile for a HE heating pump)
n2MN
Minimum speed R2
Adjustment range: (10) 30 … 100 %
Factory setting: 30 %
In the adjustment channel n2MN a relative minimum 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.
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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Installation Indications, functions and options MessagesCommissioningOperation 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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InstallationIndications, functions and optionsMessages Commissioning Operation 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 the heat quantity measurement option
(OHQM) is activated, S1, S4 or VFD can be used for measuring the temperature
(see table on p. 63).
PWM 2
PWM 1
VFD LN
R1
N
2019
18
171615
141312
12
NR2
S2S1 S3 S4 VBus
345678910
R2
S1
S2
R1
S3 /TSTT
S4 / VFD / TR
S4 / VFD / TFL

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Installation Indications, functions and options MessagesCommissioningOperation and function
Display channels
Channel Description Connection terminal Page
INIT x* ODB initialisation active - 50
FLL x* ODB filling time active - 50
STAB x* ODB stabilisation in progress - 50
COL x Temperature collector S1 51
TSTB x Temperature store 1 base S2 51
TSTT x Temperature store 1 top S3 51
TDIS s* Thermal disinfection temperature (thermal disinfection) S3 51
S4 x Temperature sensor 4 S4 51
TFL x* Temperature flow sensor S1 / S4 / VFD 51
TR x* Temperature return sensor S4 / VFD 51
VFD x* Temperature Grundfos Direct Sensor™ VFD 51
L/h x* Flow rate Grundfos Direct Sensor™ / PWM feedback signal VFD / PWM1 52
n1 % x Speed R1 R1 52
h P1 x Operating hours R1 R1 53
h P2 x Operating hours R2 R2 53
kWh x* Heat quantity in kWh - 52
MWh x* Heat quantity in MWh - 52
CDIS s* Countdown of monitoring period (thermal disinfection) - 52
SDIS s* Starting time display (thermal disinfection) - 53
DDIS s* Disinfection period display (thermal disinfection) - 53
TIME x Time - 53
Adjustment channels
Channel Description Factory setting Page
Arr x System 3 54
DT O x Switch-on temperature difference R1 6.0 K [12.0 °Ra] 54
DT F x Switch-off temperature difference R1 4.0 K [8.0 °Ra] 54
DT S x Set temperature difference R1 10.0 K [20.0°Ra] 54
RIS x Rise R1 2 K [4 °Ra] 55
PUM1 x Pump control type R1 PSOL 55
n1MN x Minimum speed R1 30 % 55
n1MX x Maximum speed R1 100 % 55
PFB1 x* PWM feedback signal input 1 OFF 56
S MX x Maximum store temperature 60 °C [140 °F] 56
OSEM x Store emergency shutdown option OFF 56
EM x Collector emergency temperature 130 °C [270 °F] 57
Collector emergency temperature if ODB is activated: 95 °C [200 °F] 57
OCC x Collector cooling option OFF 57
CMX x* Maximum collector temperature 110 °C [230 °F] 57
OSYC x System cooling option OFF 58
DTCO x* Switch-on temperature difference cooling 20.0 K [40.0 °Ra] 58
DTCF x* Switch-off temperature difference cooling 15.0 K [30.0 °Ra] 58
OSTC x Store cooling option OFF 58
OHOL x* Holiday cooling option OFF 58
THOL x* Holiday cooling temperature 40 °C [110 °F] 58

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
Adjustment channels
Channel Description Factory setting Page
OCN x Collector minimum limitation option OFF 59
CMN x* Collector minimum temperature 10 °C [50 °F] 59
OCF x Antifreeze option OFF 59
CFR x* Antifreeze temperature 4.0 °C [40.0 °F] 59
OTC x Tube collector option OFF 60
TCST x* OTC starting time 07:00 60
TCEN x* OTC ending time 19:00 61
TCRU x* OTC runtime 30 s 61
TCIN x* OTC standstill interval 30 min 61
GFD x Grundfos Direct Sensor™ OFF 61
OHQM x Heat quantity measurement option OFF 61
SEN x* VFD allocation 2 62
FMAX x* Maximum flow rate 6.0 l/min 62
MEDT x* Antifreeze type 1 63
MED% x* Antifreeze concentration 45 % 63
AH O s Switch-on temperature for thermostat 40 °C [110 °F] 20
AH F s Switch-off temperature for thermostat 45 °C [120 °F] 20
t1 O s Thermostat switch-on time 1 00:00 20
t1 F s Thermostat switch-off time 1 00:00 20
t2 O s Thermostat switch-on time 2 00:00 20
t2 F s Thermostat switch-off time 2 00:00 20
t3 O s Thermostat switch-on time 3 00:00 20
t3 F s Thermostat switch-off time 3 00:00 20
ODB x Drainback option OFF 63
tDTO x* ODB switch-on condition - time period 60 s 64
tFLL x* ODB filling time 5.0 min 64
tSTB x* ODB stabilisation time 2.0 min 64
OTD s Thermal disinfection option OFF 21
PDIS s* Monitoring period 01:00 21
DDIS s* Disinfection period 01:00 21
TDIS s* Disinfection temperature 60 °C [140 °F] 21
SDIS s* Starting time 00:00 21
MAN1 x Manual mode R1 Auto 64
MAN2 x Manual mode R2 Auto 64
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-specific channel
s* System-specific channel, only available if the corresponding option is activated

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Installation Indications, functions and options MessagesCommissioningOperation and function
System-specific functions
The following adjustments are used for the specific functions in system 3.The chan-
nels described are not available in any other system.
Thermostat function
Backup heating
Use of surplus
energy
The thermostat function works independently from the solar operation and can be
used for using surplus energy or for backup heating.
• AH O < AH F
thermostat function for backup heating
• AH O > AH F
thermostat function for using surplus energy
The symbol ⓶will be shown on the display, if the second relay output is activated.
S3 is used as the reference sensor for the thermostat function!
AH O
Thermostat switch-on temperature
Adjustment range: 0.0 … 95.0 °C [30.0 … 200.0 °F]
Factory setting: 40.0 °C [110.0°F]
AH F
Thermostat switch-off temperature
Adjustment range: 0.0 … 95.0 °C [30.0 … 200.0 °F]
Factory setting: 45.0 °C [120.0 °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 run the thermostat function for a certain period, there are 3 time
frames t1 … t3.
If the thermostat function is supposed to run from 06:00 a.m. to 09:00 a.m. only,
adjust t1 O to 06:00 a.m. and t1 F to 09:00 a.m.
If the switch-on and switch-off times of a time frame are set to an identical value,
the time frame will be inactive. If all time frames are set to 00:00, the thermostat
function is solely temperature dependent (factory setting).