ACV Solar Unit 200 User manual

*11216042* 11216042
Thank you for buying this product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
Solar Unit 200
Manual
en
Solar controller
Manual for the
specialised craftsman
Installation
Operation
Functions and options
Troubleshooting

2
en
© 20220722_11216042_ACV_Solar_Unit_200.monen.indd
Safety advice
Please pay attention to the following safety advice in order to avoid danger and
damage to people and property.
Danger of electric shock:
• When carrying out works, the device must rst of all be disconnected from the
mains.
• It must be possible to disconnect the device from the mains at any time.
• Do not use the device if it is visibly damaged.
The device must not be used by children or persons with reduced physical, sensory
or mental abilities or without any experience and knowledge. Make sure that child-
ren do not play with the device!
Only connect accessories authorised by the manufacturer to the device.
Make sure that the housing is properly closed before commissioning the device.
Target group
These instructions are exclusively addressed to authorised skilled personnel.
Only qualied electricians are allowed to carry out electrical works.
Initial commissioning must be effected by authorised skilled personnel.
Authorised skilled personnel are persons who have theoretical knowledge and ex-
perience with the installation, commissioning, operation, maintenance, etc. of elec-
tric/electronic devices and hydraulic systems and who have knowledge of relevant
standards and directives.
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.
Any use beyond this is considered improper.
Proper usage also includes compliance with the specications given in this manual.
Improper use excludes all liability claims.
Note
Strong electromagnetic elds can impair the function of the device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic elds.
EU 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.
Scope of delivery
The scope of delivery of this product is indicated on the packaging label.
Storage and transport
Store the product at an ambient temperature of 0 … 40 °C and in dry interior
rooms only.
Transport the product in its original packaging only.
Cleaning
Clean the product with a dry cloth. Do not use aggressive cleaning uids.
Decommissioning
1. Disconnect the device from the power supply.
2. Dismount the device.
Subject to technical change. Errors excepted.

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Disposal
• Dispose of the packaging in an environmentally sound manner.
• At the end of its working life,the product must not be disposed of as urban waste.
Old appliances must be disposed of by an authorised body in an environmentally
sound manner. Upon request we will take back your old appliances bought from
us and guarantee an environmentally sound disposal of the devices.
Description of symbols
Warnings are indicated with a warning symbol!
Signal words describe the danger that may occur, when it is not avoided.
WARNING means that injury, possibly life-threatening injury, can occur.
ÎIt is indicated how to avoid the danger described.
ATTENTION means that damage to the appliance can occur.
ÎIt is indicated how to avoid the danger described.
Note
Notes are indicated with an information symbol.
ÎTexts marked with an arrow indicate one single instruction step to be carried
out
1. Texts marked with numbers indicate several successive instruction steps to be
carried out.

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Contents
1 Overview .............................................................................................. 5
2 Installation ........................................................................................... 6
2.1 Mounting ........................................................................................................................6
2.2 Electrical connection ...................................................................................................7
2.3 VFD Grundfos Direct Sensor™...............................................................................8
2.4 PWM outputs................................................................................................................8
2.5 Data communication / Bus ..........................................................................................8
2.6 System overview...........................................................................................................9
2.7 Systems........................................................................................................................ 10
3 Operation and function .................................................................... 48
3.1 Buttons ........................................................................................................................ 48
4 System-Monitoring-Display .............................................................. 48
4.1 Flashing codes ............................................................................................................ 49
5 Commissioning.................................................................................. 50
6 Channel overview .............................................................................. 52
6.1 Display channels......................................................................................................... 52
6.2 Adjustment channels ................................................................................................ 55
7 Troubleshooting................................................................................. 66
8 Index ................................................................................................... 69
Solar controller Solar Unit 200
The Solar Unit 200 has been especially developed for the speed control of high-
efciency 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.

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1 Overview
• Especially designed for the speed control of high-efciency pumps
• 1 input for aVFD Grundfos Direct SensorTM
• 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
Technical data
Inputs: 4 Pt1000 temperature sensors, 1 VFD Grundfos Direct SensorTM
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 X attachment
Standby: 0.64 W
Temperature controls class: I
Energy efciency [%]: 1
Mode of operation: type 1.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: 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, mounting into patch panels is possible
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
Ingress protection: IP 20 / EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C
Pollution degree: 2
Fuse: T2A
Maximum altitude: 2000 m above MSL
Dimensions: 172 x 110 x 46 mm
110
30
62
172
46
130
130
Upper fastening
Lower fastening
Dimensions and minimum distances

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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 device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic elds.
The unit must only be located in dry interior rooms.
If the device is not equipped with a mains connection cable and a plug,the device 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:
1. Unscrew the crosshead screw from the cover and remove it along with the
cover from the housing.
2. Mark the upper fastening point on the wall. Drill and fasten the enclosed wall
plug and screw leaving the head protruding.
3. Hang the housing from the upper fastening point and mark the lower fastening
point (centres 130 mm).
4. Insert lower wall plug.
5. Fasten the housing to the wall with the lower fastening screw and tighten.
6. Carry out the electrical wiring in accordance with the terminal allocation (see
chapter 2.2).
7. Put the cover on the housing.
8. Attach with the fastening screw.
display
cable conduits with
strain relief
cover buttons
fuse T2A

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InstallationIndications, functions and optionsMessages Commissioning Operation and function
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
Connecting the device to the power supply must always be the last step
of the installation!
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
The pump speed must be set to 100% when auxiliary relays or valves are
connected.
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.
If the mains cable is damaged, it must be replaced by a special connection
cable which is available from the manufacturer or its customer service.
Do not use the device if it is visibly damaged!
Seriennummer 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 1/2
VFD
345678910
Fuse
VBus®mains
terminals
load
terminals
sensor terminals protective earth
conductor terminal
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 conductor ⏚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)
The cables carry low voltage and must not run together in a cable conduit with
cables carrying a voltage higher than 50 V (please pay attention to the valid local
regulations).The cable lentghs depend on the cross sectional area.
Example: up to 100 m at 1.5 mm², up to 50 m at 0.75 mm².The cables can be ex-
tended with a two-wire cable.

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Installation Indications, functions and options MessagesCommissioningOperation and function
2.5 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 moreVBus®modules can be connected via this data bus.
2.3 VFD Grundfos Direct Sensor™
The controller is equipped with 1 input for a digital VFD Grundfos Direct Sensor™
for measuring the ow rate and the temperature. Connection is made at the VFD
terminal.
2.4 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 control
input.
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 1/2
VFD
Made in Germany
DeltaSol®CS Plus
345678910
1 = PWM output 1, control signal
2 = PWM output 1, GND
3 = PWM output 2, GND
4 = PWM output 2, control signal
R1 N
X
PWM 1/2
PWM signal
cable
blue
blue brown
brown
yellow/green
pump signal
input
pump power
supply
230V~ power
supply
black (not
used)

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1
Standard solar system (page 10)
2
Solar system with heat exchange
(page 13)
3
Solar system with backup heating
(page 19)
4
Solar system with store loading in
layers (page 24)
5
Solar system with 2 stores and valve
logic (page 27)
6
Solar system with 2 stores and pump
logic (page 30)
7
Solar system with east-/west collectors
and 1 store (page 33)
8
Solar system with backup heating by
solid fuel boiler (page 36)
9
Solar system with heating circuit
return preheating (page 42)
10
Standard solar system with heat dump
(page 45)
2.6 System overview

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Installation Indications, functions and options MessagesCommissioningOperation and function
2.7 Systems
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.
910
VBus
PWM 1/2
VFD
S1
S2
S4 / VFD / TR
S4 / VFD / TFL
R1 S3 /TSTT

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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
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
TFL x* Temperature ow sensor S1 / S4 / VFD 53
TR x* Temperature return sensor S4 / VFD 53
VFD x* Temperature Grundfos Direct Sensor™ VFD 53
L/h x* Flow rate Grundfos Direct Sensor™ VFD 54
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 57
nMN x Minimum speed R1 30 % 57
nMX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 60 °C [140 °F] 57
OSEM x Store emergency shutdown option OFF 58
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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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] 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 61
TCST x* OTC starting time 07:00 61
TCEN x* OTC ending time 19:00 62
TCRU x* OTC runtime 30 s 62
TCIN x* OTC standstill interval 30 min 62
GFD x Grundfos Direct Sensor™ OFF 62
OHQM x Heat quantity measurement option OFF 62
SEN x* VFD allocation 2 63
FMAX x* Maximum ow 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 64
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 65
MAN2 x Manual mode R2 Auto 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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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 store are reached.
S3 can optionally be used as the reference sensor for the store emergency shut-
down option (OSEM).
If heat quantity measurement (OHQM) is activated, S1and VFD are used as the ow
and return sensors respectively.
910
VBus
PWM 1/2
VFD
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 - 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
TFL x* Temperature ow sensor S1 53
TR x* Temperature return sensor VFD 53
VFD x* Temperature Grundfos Direct Sensor™ VFD 53
L/h x* Flow rate Grundfos Direct Sensor™ VFD 54
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 57
n1MN x Minimum speed R1 30 % 57
n1MX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 60 °C [140 °F] 57
OSEM x Store emergency shutdown option OFF 58
PUM2 x Pump control type R2 OnOF 57
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

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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.
sSystem-specic channel
Adjustment channels
Channel Description Factory setting Page
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 61
TCST x* OTC starting time 07:00 61
TCEN x* OTC ending time 19:00 62
TCRU x* OTC runtime 30 s 62
TCIN x* OTC standstill interval 30 min 62
GFD x Grundfos Direct Sensor™ OFF 62
OHQM x Heat quantity measurement option OFF 62
MEDT x* Antifreeze type 1 61
MED% x* Antifreeze concentration (only if MEDT = propylene or ethylene) 45 % 63
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] 41
MX3F s Switch-off threshold for maximum temperature 58.0 °C [136.0 °F] 41
MN3O s Switch-on threshold for minimum temperature 5.0 °C [40.0 °F] 41
MN3F s Switch-off threshold for minimum temperature 10.0 °C [50.0 °F] 41
ODB x Drainback option OFF 64
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 65
MAN2 x Manual mode R2 Auto 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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Installation Indications, functions and options MessagesCommissioningOperation 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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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-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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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 heat quantity measurement (OHQM) is
activated, S4 and VFD are used as the ow and return sensors respectively.
VBus
910
PWM 1/2
VFD
R2
S1
S2
R1
S3 / TSTT
S4 / VFD / TR
S4 / VFD / TFL

en
20
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
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
TFL x* Temperature ow sensor S1 / S4 / VFD 53
TR x* Temperature return sensor S4 / VFD 53
VFD x* Temperature Grundfos Direct Sensor™ VFD 53
L/h x* Flow rate Grundfos Direct Sensor™ VFD 54
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 57
n1MN x Minimum speed R1 30 % 57
n1MX x Maximum speed R1 100 % 57
S MX x Maximum store temperature 60 °C [140 °F] 57
OSEM x Store emergency shutdown option OFF 58
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