Riello SUN 1 PLUS 2 RS User manual

cod. 20100537 rev. 2 09/2015
SUN 1 PLUS 2 RS
EN INSTALLATION INSTRUCTIONS

2
RANGE
MODEL CODE
SUN 1 PLUS 2 RS 20100413
ACCESSORIES
For a complete list of accessories and details of their compatibil-
ity, refer to the Catalogue.
ENGLISH
Dear Customer,
Thank you for choosing a Rdifferential controller. You have
purchased a modern, quality product that is designed to give
dependable and safe service and to provide comfort in the
home for many years to come. Arrange for your Rdifferential
controller to be serviced regularly by an authorised Rservice
centre. Their personnel are specially trained to keep your differ-
ential controller efcient and cheap to run. Rservice centres
also stock any original spare parts that might be required.
This manual contains important instructions and precautions
that must be observed to ensure the trouble-free installation
and efcient functioning of your Rdifferential controller.
Please accept our renewed thanks for your purchase,
Riello S.p.A.
CONFORMITY
SUN 1 PLUS 2 RS differential controllers conform to:
−Standards EN 55014-1-2, EN 60730-1-2-9, EN 60335-1
−Low Voltage Directive 2006/95/EC
−Electromagnetic Compatibility Directive 2004/108/EC
−RoHS II, 2011/65/EC.
9 This product must only be used for the purpose for which it
is designed and made, as specied by R. Rdeclines
all responsibility, contractual or other, for damage to prop-
erty or injury to persons or animals caused by improper in-
stallation, adjustment, maintenance or use.

3
This manual, Code 20100537 - Rev. 2 (09/2015)
comprises 40 pages.
CONTENTS
The following symbols are used in this manual:
9 CAUTION! = Identies actions that require caution and
adequate preparation.
0 STOP! = Identies actions that you MUST NOT do.
This manual, Code
- Rev.
comprises
pages.
1 GENERAL SAFETY INFORMATION ....................4
2 PRECAUTIONS ......................................4
3 DESCRIPTION OF THE APPLIANCE ...................5
4 DESCRIPTION OF FUNCTIONS .......................5
5 NR. DISPLAYED......................................5
6 PARAMETER AREA ..................................5
7 SYMBOLS AREA.....................................6
8 SYSTEM LAYOUT SCHEMATIC .......................6
9 FLASHING CODES ...................................7
9.1 Technical specications .........................7
10 WIRING DIAGRAM ...................................7
11 UNPACKING THE PRODUCT..........................7
12 DIMENSIONS ........................................8
13 ASSEMBLY ..........................................8
14 ELECTRICAL CONNECTIONS.........................9
15 PUTTING INTO SERVICE ............................10
16 OVERVIEW OF SYSTEM LAYOUTS ...................12
17 OVERVIEW OF PARAMETERS .......................12
18 VIEW-ONLY PARAMETERS ..........................15
18.1 Drainback periods display ...................... 15
18.2 Collector temperature display.................... 15
18.3 Storage cylinder temperature display .............. 15
18.4 Sensor S3-S4-VFD temperature display............. 15
18.5 Flow/return temperature display ................. 16
18.6 Flow rate display ............................. 16
18.7 Current pump speed display .................... 16
18.8 Operating hours counter - thermal energy.......... 16
18.9 Thermal disinfection time remaining display .........17
18.10 Thermal disinfection activation time display .........17
19 CONTROL PARAMETERS ...........................18
19.1 System layout selection ........................ 18
19.2 ∆T settings .................................. 18
19.3 Pump control ................................ 18
19.4 Maximum storage cylinder temperature............ 19
19.5 Option: storage cylinder safety deactivation ......... 19
19.6 Collector temperature limit - Collector safety
deactivation................................. 19
19.7 System cooling function........................ 19
19.8 Collector cooling..............................20
19.9 Option: Collector minimum limitation .............20
19.10 Option: frost protection function ................. 21
19.11 Storage cylinder cooling function ................. 21
19.12 Tube collector option .......................... 22
19.13 Thermostat function...........................23
19.14 Anti-legionella function........................ 23
19.15 Option: monitoring period ......................24
19.16 Option: disinfection duration ....................24
19.17 Option: disinfection temperature .................24
19.18 Option: wait time.............................24
19.19 Option: remaining monitoring time ...............25
19.20 Minimum speed..............................25
19.21 Grundfos Direct Sensor™ activation ...............25
19.22 Thermal energy metering .......................25
19.23 Thermal energy metering with xed ow rate .......25
19.24 Thermal energy metering with Grundfos Direct Sensor™
sensor VFD ..................................26
19.25 Assignment of thermal energy metering sensors .....26
19.26 Drainback function ...........................26
19.27 Period – activation condition.................... 27
19.28 Filling time.................................. 27
19.29 Stabilisation................................. 27
19.30 Booster function ............................. 27
19.31 Functioning mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
19.32 Language ...................................28
19.33 Unit .......................................28
19.34 Reset ......................................28
19.35 Warning question ............................28
20 INSTALLATION DIAGRAMS ..........................29
21 TROUBLESHOOTING ...............................37

4
1 GENERAL SAFETY INFORMATION
9 As soon as you open the packaging, check immediately that
the contents are all present and undamaged. Contact the
Rreseller from whom you purchased the product if you
notice any problems.
9 This product must be installed by a legally qualied heat-
ing engineer. On completion of the installation, the install-
er must issue the owner with a declaration of conformity
conrming that the installation has been completed to the
highest standards in compliance with the instructions pro-
vided by Rin this instruction manual, and that it con-
forms to all applicable laws and standards.
9 This product must only be used for the purpose for which it
is designed and made, as specied by R. Rdeclines
all responsibility, contractual or other, for damage to prop-
erty or injury to persons or animals caused by improper in-
stallation, adjustment, maintenance or use.
9 This manual is an integral part of the equipment and there-
fore must be stored carefully and must ALWAYS accompany
the differential controller even if it is sold to another Owner
or User or transferred to another plant. If it is damaged or
lost, request another copy from your local Technical Assis-
tance Service R.
9 This control panel is designed and made for use with boilers
generating hot water up to 110°C, and must be used exclu-
sively for this purpose and within its specied performance
limits.
2 PRECAUTIONS
0 Never clean the boiler without rst disconnecting it from the
mains electricity supply by turning the mains power switch
and the control panel switch OFF.
0 Do not tamper with or adjust the safety or control devices
without prior authorisation and instructions from the man-
ufacturer.
0 Never pull, disconnect, or twist the electrical cables coming
from the appliance even if it is disconnected from the mains
electricity supply.
0 Dispose of packaging materials in compliance with appli-
cable standards and legislation governing the disposal of
urban, domestic and industrial waste.
0 Never switch the control panel on even for a short period if
the safety devices are not functioning correctly or have been
tampered with.
0 All maintenance and repairs must be carried out by a legally
qualied heating engineer.
0 Do not use water to extinguish re in the control panel.
Switch power OFF at the mains power switch to isolate the
control panel electrically rst. Then use a class E re extin-
guisher (marked “SUITABLE FOR LIVE ELECTRICAL ITEMS”) to ex-
tinguish the ames.

5
3 DESCRIPTION OF THE APPLIANCE
The SUN 1 PLUS 2 RS differential controller is designed to control a
domestic hot water system with an integrated solar water heat-
ing system. The supplementary function for metering thermal
energy production can also be selected.
The controller is equipped with 4 inputs for temperature sen-
sors: 1 VFD sensor for measuring temperature and ow rate, 2
electromechanical relay outputs for switching the pump on and
off and 1 PWM output for modulating pump control.
A back-lit display permits easy use of controller functions, and
also displays a schematic of the active system layout formed by
two-colour LEDs.
4 DESCRIPTION OF FUNCTIONS
The controller is operated by means of 3 buttons located under
the back-lit display.
Button 1 (+) lets you scroll forward through displayed parame-
ters (see the “View-only parameters” section) or increment the
setpoint of control parameters (see the “Control parameters”
section).
Button 2 (-) lets you scroll back through displayed parameters,
access the parameter setting/viewing area, and decrement con-
trol parameter setpoints.
Button 3 (OK/set) lets you edit control parameters and conrm
new setpoint values.
Nr. displayed
Proceed as follows to display the controller’s view-only param-
eters.
−Briey press key 1 (+) or 2 (-). The rst view-only param-
eter for the active system layout appears on the screen
−scroll through the parameters with keys 2 (-) and 1 (+)
−each parameter shown is accompanied by its current
reading.
For a complete list of view-only parameters, see the relevant
section in the Technical Service part of this manual.
1
3
2
5 NR. DISPLAYED
The screen is made up of 3 areas:
−parameter area
−symbols area
−the system layout area.
6 PARAMETER AREA
The parameter area consists of two lines of characters.
The top line is an alphanumeric eld of characters of 16 seg-
ments each. This line displays the code identifying the current
parameter (see the list of parameters).
The bottom line is made up of digits of 7 segments and displays
the current parameter value.
Temperatures are displayed in °C or °F . Temperature differentials
are displayed °K or °Ra.

6
7 SYMBOLS AREA
The symbols area consists of two lines of symbols identifying
system state.
State Normal Flashing
Relay 1 activated
Relay 2 activated
Maximum storage cylinder tem-
perature exceeded
Storage cylinder safety deactiva-
tion activated +
Collector safety deactivation
activated
Collector cooling activated
System cooling activated
Storage cylinder cooling acti-
vated +
Holiday cooling activated
Holiday cooling activated +
Collector minimum temperature
limit activated
Frost protection function acti-
vated
Frost protection function active
Manual mode, relay 1 ON +
Manual mode, relay 2 ON +
Manual mode, relay 1 / 2 OFF
Sensor fault
8 SYSTEM LAYOUT SCHEMATIC
The system layout area displays a schematic of the active system
as set in the Arr parameter. The schematic is made up of a num-
ber of symbols, which can be lit, ashing or off according to the
current system state.
21
976 8
3
10
11
5
4
1 Sensors
2 Storage cylinder top sensor
3 Collector 1
4 Valve
5 Pumps
6 Storage cylinder heat exchanger
7 Cylinder body
8 Storage cylinder bottom sensor
9 Storage cylinder 2 or supplementary heating (with supple-
mentary symbol)
10 Supplementary symbol for burner functioning
11 Supplementary heating with burner symbol

7
9 FLASHING CODES
Flashing schematic symbols
Pumps The pump symbol ashes when the pump is running
Sensors The sensor symbol ashes when the associated view-only parameter is selected
Sensors One or more sensor symbols ash very rapidly if a sensor fault is detected
Supplementary heating The burner symbol ashes when active
9.1 Technical specications
Description SUN 1 PLUS 2 RS
Power supply 100-240V (50-60Hz) V - Hz
Fuse T2 A
Maximum permitted pulsed overvoltage 2,5 kV
R1-R2 relay contacts 2 (1) A
Index of protection according to EN60529 IP20
Dimensions 172 x 110 x 46 mm
Room temperature range 0-40 °C
Inputs 4 x PT1000 temperature sensors
1 x VFD sensor
Data communication VBus®
Vbus current level 35 mA
PWM frequency 512 Hz
PWM voltage 10,5 V
10 WIRING DIAGRAM
Fuse
VBus®Grid terminals
Consumer terminalsSensor terminals Safety wire terminals
1 (1) A 240 V~
1 (1) A 240 V~
L
N
R1
R2
R1
N
91 02
18
51 61 71
21 31 411 2
N R2
IP 20
T2A
100 ... 240 V~
50-60 Hz
Temp. Sensor Pt1000
suBV4S3S1S 2S
PWM
VFD
Made in Germany
345 6 7 8 9 10
11 UNPACKING THE PRODUCT
The SUN 1 PLUS 2 RS controller comes in a cardboard box that also contains the following accessories:
−2 x PT1000 FKP6 high temperature sensors, cable length = 1.5 m
−2 x PT1000 FRP6 storage cylinder sensors, cable length = 2.5 m
−1 x PWM adapter cable
−1 x accessories bag containing:
2 x screws and plugs for wall mounting
4 x cable clamps with xing screws
−1 x T2 A fuse (inside appliance)
−instruction manual.

8
12 DIMENSIONS
110
30
62
172
46
13 ASSEMBLY
9 Always make sure that power to the controller is completely
disconnected before removing the cover.
−Unscrew the cross-head screw holding the cover in place.
Pull the cover outwards and downwards to remove it
from the controller.
Cross-head
screw
−Mark the top xing point on the mounting plate or wall.
Drill the hole and t the plug and xing screw supplied
with the controller.
Display
Cable conduits
with strain relief
Cover
Button
Fuse T2A
−Fit the controller casing over the top xing point and
mark the position of the bottom xing hole (distance be-
tween holes 130 mm).
−Drill the hole and t the bottom wall plug.

9
−Hang the controller over the top xing point and secure
it to the wall at the bottom using the wall plug and xing
screw provided.
130
Suspension
point
Fixing hole
−Make all necessary electrical connections as instructed in
the next section, respecting the markings of the termi-
nals.
−Fit the cover over the top of the controller and x it in
place with the cross-head screw.
14 ELECTRICAL CONNECTIONS
POWER SUPPLY
The controller must be connected to a power supply of the fol-
lowing voltage and frequency: 100-240 V and 50-60 Hz.
Fit a breaker-disconnector in the power supply line to discon-
nect the controller for maintenance.
Solar controller power connections:
20 Live terminal for power cable
19 Neutral terminal for power cable
12 Earth (ground) terminal for power cable
Relay outputs for device control
Relays R1-R2 function like electromechanical relays for switching
on and off devices such as pumps, valve servomotors, etc.. Relay
R1 is an electromechanical relay
Water connections:
R1
18 live wire / control switch for switching pump on/off
17 neutral wire
13 earth (ground) wire
Water connections:
R2
16 live wire / control switch for switching pump on/off
15 neutral wire
14 earth (ground) wire
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
L
R1 N
N
91 02
18
51 61 7121 31 41
N R2
IP 20
T2A
100 ... 240 V~
50-60 Hz
Inputs for temperature sensors
The controller has 4 inputs, each identied by a code:
S1-S2-S3-S4 are the cable terminals for the PT1000 temperature
sensors used in the selected system layout. Cable polarity is not
important.
1-2 sensor 1 (e.g. collector 1 temperature sensor)
3-4 sensor 2 (e.g. storage cylinder 1 bottom temperature)
5-6 sensor 3 (e.g. storage cylinder 1 top temperature sensor)
7-8 sensor 4 (e.g. collector 1 return temperature sensor)
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
1 2
Temp. Sensor Pt1000
suBV4S3S1S 2S
PWM
VFD
Made in Germany
345 6 7 8 9 10
Sensor terminals S1...S4
Connected PT 1000 temperature sensors can be checked with a
multimeter-tester. Their temperatures can be compared with
the resistance values given below.
°C Ω°C Ω
-10 961 55 1213
-5 980 60 1235
01000 65 1252
51019 70 1271
10 1039 75 1290
15 1058 80 1309
20 1078 85 1328
25 1097 90 1347
30 1117 95 1366
35 1136 100 1385
40 1155 105 1404
45 1175 110 1423
50 1194 115 1442
Resistance values for Pt1000 sensors

10
Data transmission / Bus
The controller has two terminals for data transmission over a
bus. Polarity is not important.
Data transmission protocol is VBus®, which permits the trans-
mission of data to external devices such as:
−An external WMZ calorimeter for thermal energy metering
−External displays
−Datalogger
−Remote control.
1 (1) A 240 V~
1 (1) A 240 V~
R1
R2
1 2
Temp. Sensor Pt1000
suBV4S3S1S 2S
PWM
VFD
Made in Germany
345 6 7 8 9 10
Vbus
Grundfos Direct™ sensors (VFD)
The controller has 1 input for Grundfos Direct™ sensors (VFD) used
to measure ow rate and temperature. The connection uses the
VFD terminal (bottom left).
PWM output
The speed of the HE pump is controlled by a PWM signal.
Pumps must be connected to the controller’s PWM outputs for
connection to the relays. The pump must be connected to the
relay and to the controller’s PWM output. The HE pump receives
power when the relay is activated and deactivated.
The two left pins of the PWM socket are used as control outputs
for a pump with a PWM control input. The two right pins are not
used.
PWM
1 2
1 PWM output 1, control signal
2 1st PWM output, GND
15 PUTTING INTO SERVICE
Electrical power connection
The controller enters the initialisation phase.
When the controller is put into service for the rst time, and also
after a reset, the startup menu is displayed. The startup menu
guides users through the most important control parameters for
system functioning.
Programming
−Press button 3 to select the control parameter. The SET
symbol ashes.
−Press buttons 1 and 2 to set the value.
−Press button 3 again to conrm the setting. The SET sym-
bol appears xed again.
−Press button 1 or 2 to switch to the previous or next con-
trol parameter.
Language
Set the menu language in this parameter.
Setting range: DE, EN, FR, ES, IT.
Default settings: DE.
Unit
Set the unit of measurement in which temperature and temper-
ature differential must be displayed.
Setting range: °F, °C.
Default settings: °C.
Time
Set the current time.
Set the hour rst and then the minutes.
System layout
Set the required system layout.
Setting range: 1 - 3.
Default settings: 1.

11
If the system layout is modied later, all settings are lost. For this
reason a warning question is always displayed when settings
are changed in the Arr parameter.
Conrm the warning question only if you really want to change
the system layout!
Maximum storage cylinder temperature
Maximum desired storage cylinder temperature.
Setting range: 4 - 95 °C (4 - 90°C for Arr 3).
Default settings: 60 °C.
9 The controller has a xed safety deactivation function that
deactivates the system as soon as the storage cylinder
reaches a temperature of 95 °C.
Pump control
Set the type of pump control required.
Setting range: OnOF, PULS, PSOL, PRIS.
Default settings: PSOL.
The following control types can be selected:
Control for standard pumps without speed control
−OnOF (pump activated / deactivated)
Control for standard pumps with speed control
−PULS (pulsed control via semiconductor relay)
High efciency (HE) pump control
−PSOL (PWM curve for an HE solar pump)
−PRIS (PWM curve for an HE heating pump)
To reduce the frequency of high efciency pump starts, the
controller automatically extends its functioning when no speed
control signal is transmitted by the relay (PUM = PSOL or PRIS).
This relay remains activated for an hour after deactivation con-
ditions are satised.
Minimum speed
Set minimum speed for the corresponding pump.
Setting range: (10) 30 - 100 %.
Increment: 5%.
Default settings: 30%.
9 If users with no speed control (e.g. valves) are connected,
minimum relay speed must be set at 100%.
Maximum speed
Set maximum speed for the corresponding pump.
Setting range: (10) 30 - 100 %.
Increment: 5%.
Default settings: 100 %.
9 If electrical equipment with no speed control (e.g. valves) is
used, set the relay speed to 100 % or set the pump control
to OnOF to deactivate speed control.
Conrm
After the last parameter of the startup menu, you are asked to
conrm the settings made in it.
Press button 3 to conrm the settings made in the startup menu.
9 Settings made in the startup menu can be modied in the
corresponding control parameter at any time, even after
startup.

12
16 OVERVIEW OF SYSTEM LAYOUTS
The controller is pre-programmed with 3 system layouts.
View of system layouts:
Arr 1: Standard solar system
Arr 2: Solar system with supplementary heating
Arr 3: Standard solar system with excess heat dissipation
IMP 1 IMP 2 IMP 3
17 OVERVIEW OF PARAMETERS
x The parameter is available
x* The parameter is only available provided the corresponding
function has been activated
s Specic system parameter
s* Specic system parameters are only available if the
corresponding function has been activated
Overview of parameters for systems 1, 2 and 3
Parameter SYST Description
1 2 3
INIT x* x* ODB initialisation activated
FLL x* x* Filling time ODB
STAB x* x* Stabilisation ODB
COL xxxCollector 1 temperature display
TSTB xStorage cylinder 1 bottom temperature display
TS x x Storage cylinder 1 temperature display
TSTT xxxStorage cylinder 1 top temperature display
TDIS s* Thermal disinfection temperature display
S3 x x Sensor 3 temperature display
S4 xxxSensor 4 temperature display
VFD x* x* x* VFD sensor temperature display
TR x* x* x* Return sensor temperature display
TFL x* x* x* Flow sensor temperature display
L/h x* x* x* Flow rate display
n% xxxCurrent pump speed
kWh x* x* x* Thermal energy display in kWh
MWh x* x* x* Thermal energy display in MWh
SDIS s* Remaining wait time display
DDIS s* Display of time remaining to end of disinfection
CDIS s* Display of time remaining to end of monitoring
TIME xTime
h P xRelay 1 hours of operation display
h P1 x* x x Relay 1 hours of operation display
h P2 x* x x Relay 2 hours of operation display
Arr 1 2 3 System layout
SAVE Conrm warning question
DT O xxxActivation temperature differential
DT F xxxDeactivation temperature differential
DT S xxxNominal temperature differential

13
Parameter SYST Description
1 2 3
RIS xxxBoost
PUM xxxPump control
nMN xxxMinimum speed
nMX xxxMaximum speed
S MX xxxStorage cylinder 1 maximum temperature
OSEM xxxStorage cylinder safety deactivation
EM xxxCollector 1 safety temperature
Collector temperature with ODB activated
OCC x x Collector 1 cooling option
CMX x* x* sCollector 1 maximum temperature
OSYC x x System cooling function
DTCO x* x* Activation temperature differential
DTCF x* x* Deactivation temperature differential
OSTC x x Storage cylinder cooling function
OHOL x* x* Holiday cooling
THOL x* x* Holiday cooling temperature
OCF xxxCollector 1 minimum temperature limit function
CMN x* x* x* Collector 1 minimum temperature
OKF xxxCollector 1 frost protection option
CFR x* x* x* Collector 1 frost protection temperature
OTC xxxTube collector function
TCST x* x* x* Activation time
TCEN x* x* x* Deactivation time
TCRU x* x* x* Run time
TCIN x* x* x* Inactive time
AH O sThermostat activation temperature
AH F sThermostat deactivation temperature
t1 O sThermostat activation time 1
t1 F sThermostat deactivation time 1
t2 O sThermostat activation time 2
t2 F sThermostat deactivation time 2
t3 O sThermostat activation time 3
t3 F sThermostat deactivation time 3
OtD sAnti-legionella function
PDIS s* Monitoring period
TDIS s* Disinfection temperature
DDIS s* Disinfection duration
SDIS s* Wait time
GFD xxxGrundfos Direct Sensor™ activation
OHQM xxxThermal energy metering
PMAX x* x* x* Flow rate in l/min
SEN x* x* x* Digital sensor for measuring ow rate
MEDT x* x* x* Type of frost protection
MED% x* x* x* Level of frost protection
ODB x x Drainback function
tDTO x* x* Period – activation condition

14
Parameter SYST Description
1 2 3
tFLL x* x* Filling time
tSTB x* x* Stabilisation
OBST s* Booster function
MAN1 xxxRelay 1 manual mode
MAN2 xxxRelay 2 manual mode
LANG xxxLanguage
UNIT xUnit of measurement for temperature
RESE xReset function
PROG XX.XX Program number
VERS X.XX Version number
9 See the corresponding section for the active system for information on the control parameters, electrical connections, water
circuit components, relays, and sensors supported by that conguration.

15
18 VIEW-ONLY PARAMETERS
9 View-only parameters depend on the active system layout.
The controller only displays values for the active system lay-
out.
18.1 Drainback periods display
Initialisation
INIT: ODB initialisation activated
This parameter displays the countdown of the time set in tDTO.
Filling time
FLL: Filling time ODB activated
This parameter displays the countdown of the time set in tFLL.
Stabilisation
STAB: ODB stabilisation activated
This parameter displays the countdown of the time set in tSTB.
18.2 Collector temperature display
COL: Collector temperature
Display range: -40 ... +260 °C
Shows the current temperature of the collector.
18.3 Storage cylinder temperature display
TS, TSTB, TSTT, TDIS: Storage cylinder temperature
Display range: -40 ... +260 °C
Shows the temperature measured in the storage cylinder.
TS storage cylinder bottom temperature
TSTB storage cylinder bottom temperature
TSTT storage cylinder top temperature
TDIS thermal disinfection temperature
18.4 Sensor S3-S4-VFD temperature display
S3, S4: Sensor temperature
Display range: -40 ... +260 °C
VFD: 0 ... 100 °C
Shows supplementary sensor temperature, view only.
S3 Sensor 3 temperature
S4 Sensor 4 temperature
VFD Grundfos direct sensor
Note! S3 and S4 are only displayed provided the temperature
sensors are actually connected. The VFD sensor is only displayed
if a Grundfos Direct Sensor has already been connected up and
activated.

16
18.5 Flow/return temperature display
TR, TFL: Other temperatures
Display range: -40 ... +260 °C
Shows the current temperature measured by the corresponding
sensor.
TR collector return temperature
TFL collector ow temperature
18.6 Flow rate display
L/h: Flow-rate
Setting range: according to the type of sensor used
Shows the ow rate measured by the VFD sensor.
18.7 Current pump speed display
n %: Current pump speed
Display range: 30 ... 100 %
Current pump speed display.
18.8 Operating hours counter - thermal energy
h P, h P1, h P2: Operating hours counter
View-only parameter
The operating hour counter sums the hours of operation of each
component controlled by the corresponding relay (h P, h P1, h
P2). The display only shows complete hours.
Operating hour counts can be zeroed by selecting the parameter
for the counter in question. Press and hold button 3 for a few
seconds until the SET message starts to ash and the count is
reset to zero. Press button 3 again to conrm.
To cancel the reset, press button 3 for 5 seconds. The controller
switches to initial display mode.
kWh/MWh: Thermal energy in kWh / MWh
Displays the thermal energy produced – only available if the
thermal energy metering function (OHQM) is activated. Thermal
energy metering can be implemented in two ways: with a xed
ow rate or with a Grundfos Direct Sensor™ VFD. Measured ther-
mal energy is displayed in kWh in parameter kWh and in MWh
(kWh x 1000) in parameter MWh.
The sum of the two displayed values represents the total amount
of thermal energy produced.
RESETTING THE THERMAL ENERGY METER
The thermal energy count can be reset to zero. Proceed as fol-
lows.
Select one of the two parameters. The SET message appears
xed. Press and hold button 3 (SET/OK) for 2 seconds to enter
reset mode. The SET message ashes and the value is reset to
zero. Press button 3 again to conrm the operation.
To cancel the reset, press button 3 for 5 seconds. The controller
automatically switches to its initial display mode.

17
18.9 Thermal disinfection time remaining display
CDIS: Monitoring period countdown
Display range: 0 … 30:0 … 24 (dd:hh)
If the thermal disinfection function (OtD) is activated and in the
monitoring period, remaining time (in days and hours) is count-
ed down and displayed as CDIS.
DDIS: Heating period display
Display range: 00:00 … 24:00 (hh:mm)
If the thermal disinfection function (OtD) is activated and the
heating period is active, remaining time (in hours and minutes)
is counted down and displayed as DDIS.
18.10 Thermal disinfection activation time display
SDIS: Activation time display
Display range: 00:00 … 24:00 (hh:mm)
If the thermal disinfection function (OtD) is activated and a de-
layed activation time has been set, the set activation time ash-
es and is displayed as SDIS.
TIME: Indicates current time
−Press button 3 for two seconds to set the hour
−Press buttons 1 and 2 to set the hour
−Press button 3 to set the minutes
−Press buttons 1 and 2 to set the minutes
−Press button 3 to save the settings

18
19 CONTROL PARAMETERS
9 Active control parameters depend on the selected system
layout. Only the parameters displayed for the active system
layout can be modied.
19.1 System layout selection
Arr: System layout selection
Setting range: 1 ... 3
Default setting: 1
This parameter lets you select a predened system layout. Every
system layout has specic settings that can be modied indi-
vidually.
If the system layout is modied later, all settings are lost. For this
reason a warning question is always displayed when settings
are changed in the Arr parameter.
Conrm the warning question only if you really want to change
the system layout!
Press button 3 to conrm the safety question.
19.2 ∆T settings
DT O: Activation temperature differential
Setting range: 1,0 ... 20,0 K
Default setting: 6.0 K
DT F: Deactivation temperature differential
Setting range: 0,5 ... 19,5 K
Default setting: 4.0 K
Initially, the controller acts as a standard differential controller.
The pump is activated as soon as the activation differential (DT
0) is reached.
If the temperature differential is les than the set deactivation
temperature differential (DT F), the controller deactivates the so-
lar pump
Note! The activation temperature differential must be at least
0.5 K above the deactivation temperature.
RIS: Boost
Setting range: 1 ... 20 K [2 ... 40 °Ra]
Default setting: 2 K [4 °Ra]
Note! The functioning mode of the corresponding relay must be
set to “Auto” for speed control (control parameter MAN1/MAN2).
When the activation temperature differential is reached, the
pump is activated at maximum speed or 10 seconds. Speed is
then reduced to the minimum speed setting (Default setting =
30 %).
When the temperature differential reaches the nominal temper-
ature differential setting, speed is increased by one step (10 %).
Every time the differential increases by the value set in RIS, speed
increases by 10% until it reaches the 100% maximum speed.
Note! Nominal temperature differential must be at least 0.5 K
[1°Ra] greater than the activation temperature differential.
19.3 Pump control
PUM: Pump control
Selection: OnOF, PULS, PSOL, PRIS
Default setting: OnOF

19
This parameter species the type of pump control. The following
control types can be selected:
−Control for standard pumps without speed control
OnOF (pump activated/deactivated)
−Control for standard pumps with speed control
PULS (pulsed command via semiconductor relay)
−High efciency (HE) pump control
PSOL (PWM curve for an HE solar pump)
PRIS (PWM curve for an HE heating pump)
To reduce the frequency of high efciency pump starts, the
controller automatically extends its functioning when no speed
control signal is transmitted by the relay (PUM = PSOL or PRIS).
This relay remains activated for an hour after deactivation con-
ditions are satised.
9 During extended functioning, the relay symbol disappears
from the display and the pump remains off. The relay nev-
ertheless remains live!
9 Make sure that power is switched off at a disconnector be-
fore handling the controller!
19.4 Maximum storage cylinder temperature
S MX: Maximum storage cylinder temperature
Setting range: 4 ... 95 °C
Arr 3: 4 ... 90 °C
Default setting: 60 °C
Storage cylinder heating is deactivated when measured temper-
ature exceeds the set maximum, in order to prevent overheating
and potential damage. A hysteresis of 2°K is set for maximum
storage cylinder temperature.
If this temperature is exceeded, the symbol ( ) appears on the
display.
Note! The controller incorporates a safety deactivation function
that stops circulation to the storage cylinder or buffer tank if the
temperature of the heat transfer medium reaches approximate-
ly 95 °C.
19.5 Option: storage cylinder safety deactivation
OSEM: Storage cylinder safety deactivation
Setting range: ON, OFF
Default setting: OFF
This option permits use of the internal safety deactivation func-
tion for the top section of the storage cylinder too.
If the temperature measured by the reference sensor (S3) ex-
ceeds 95 °C, the storage cylinder is blocked and charging inter-
rupted until the temperature falls back under 90 °C.
Note! The reference sensor is sensor S3.
19.6 Collector temperature limit - Collector safety
deactivation
EM: Collector temperature limit
Setting range: 80 ... 200 °C
Default setting: 130 °C
If the maximum collector temperature (EM) is exceeded, the so-
lar pump (R1) is deactivated to prevent overheating and possible
damage to the components of the solar system (collector safety
deactivation).
The default maximum temperature limit setting is 130 °C, but any
value in the range 80 to 200 °C can be set. A hysteresis of 10 °K is
set for the collector maximum temperature limit.
If maximum collector temperature is exceeded, the symbol
ashes on the display.
9 Note! When the drainback function ODB is activated, setting
range is reduced to 80 ... 120 °C. The default setting is 95 °C.
19.7 System cooling function
OSYC: System cooling function
Setting range: ON, OFF
Default setting: OFF

20
DTCO: Activation temperature differential
Setting range: 1,0 ... 30,0 K
Default setting: 20,0 K
When the system cooling function is activated, the controller at-
tempts to keep the solar system functioning as long as possible.
This function deactivates storage cylinder maximum tempera-
ture as the deactivation condition for thermal energy metering
in the collector circuit even on days of strong sunlight.
If the activation temperature differential DTCO is set, the solar
system remains active even if the temperature exceeds storage
cylinder maximum temperature (S MX). Solar charging continues
until storage cylinder temperature reaches 95 °C (storage cylin-
der safety deactivation), the temperature differential is less than
the value set in DTCF, or the collector safety temperature EM is
reached.
When the system cooling function is activated, the symbols
and (ashing) appear on the display.
DTCF: Deactivation temperature differential
Setting range: 0,5 ... 29,5 K
Default setting: 15.0 K
9 Note! This function is available when the collector cooling
function(OCC) is deactivated.
19.8 Collector cooling
OCC: Collector cooling function
Setting range: ON, OFF
Default setting: OFF
CMX: Maximum collector temperature
Setting range: 70 ... 160 °C
Default setting: 110 °C
If the system cooling function (OCC) is set ON, the controller mon-
itors collector temperature and cools the collector if necessary.
If maximum storage cylinder temperature is reached, the solar
pump is deactivated, but if collector temperature continues to
rise to maximum collector temperature (CMX), the solar pump
is activated again until collector temperature drops back below
this value.
In the meantime, storage cylinder temperature is allowed to
rise as far as the maximum temperature setting (S MX), or to
the maximum permitted value of 95 °C (storage cylinder heating
safety deactivation temperature).
If the OSTC parameter is also ON, the storage cylinder cooling
function is also activated. This function ensures a better thermal
equilibrium between heat source and collector by running the
solar water heating system for extended periods even on hot
summer days.
If temperature in the storage cylinder exceeds the set maximum
(S MX) and collector temperature is at least 5 K below that of
the storage cylinder, the solar system remains activated to cool
the storage cylinder through the collector until storage cylinder
temperature is again lower that the set maximum (S MX). Cool-
ing stops when collector temperature is 2 K below storage cylin-
der temperature).
When the system cooling function (OCC) is activated, the symbols
and ash on the display.
19.9 Option: Collector minimum limitation
OCF: Collector minimum limitation
Setting range: ON, OFF
Default setting: OFF