SUNFLOWER SR81Q Technical manual

Operation Instruction
SR81Q
Intelligent Controller
for Split Pressurized Solar Hot Water System
Please read this instruction carefully!

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Contents
1. Safety information.........................................................................................................3
1.1 Installation and commissioning...................................................................................3
1.2 About this manual........................................................................................................3
1.3 Liability waiver.............................................................................................................3
1.4 Important information..................................................................................................4
1.5 Signal description........................................................................................................4
1.6 Button and HMI description.........................................................................................4
2. Overview........................................................................................................................5
2.1 Technical data .............................................................................................................5
2.2 Delivery list..................................................................................................................6
3. Installation.....................................................................................................................6
3.1 Mounting the display of controller...............................................................................7
3.2 Mounting the board of controller.................................................................................7
3.3 Preparation before wiring connection.........................................................................7
3.4 Wiring connection........................................................................................................7
3.5 Terminal connection ....................................................................................................8
3.6 R3 output connection with T- valve / pump...............................................................10
3.7 Connection with high efficiency pump.......................................................................10
4. System description (Standard solar system with 1 tank, 1 collector field) .................12
5. Time setup...................................................................................................................13
6. Function’s parameters and options.............................................................................13
6.1 Overview of menu structure......................................................................................13
6.2 Menu operation description.......................................................................................14
6.3 Value checking and function checking......................................................................14
7. Functions operation and parameters setting (for user)...............................................15
7.1 THET Timing heating.................................................................................................15
7.2 CIRC DHW circulation pump controlled by temperature and time...........................18
8. Function operation and parameter setup (engineer)..................................................23
8.1 PWD Password.........................................................................................................23
8.2 LOAD tank heating....................................................................................................24
8.3 COL Collector function..............................................................................................26
8.4 PUMP Pump control mode........................................................................................31

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8.5 COOL Cooling function .............................................................................................34
8.6 AUX Auxiliary function...............................................................................................38
8.7 MAN Manual operation .............................................................................................42
8.8 BLPR Blocking protection .........................................................................................43
8.9 OTDI Thermal Sterilization Function.........................................................................43
8.10 OPAR Parallel relays ..............................................................................................45
8.11 OHQM Thermal energy measuring.........................................................................46
8.12 FS Flow meter option and flow rate monitoring......................................................49
8.13 UNIT Switch ............................................................................................................52
8.14 RET Reset...............................................................................................................52
8.15 PASS Password set................................................................................................53
8.16 Manual heating........................................................................................................54
8.17 ECO Economic mode..............................................................................................55
8.18 DHW circuit pump triggered manually....................................................................55
8.19 On/Off controller......................................................................................................55
8.20 Holiday function.......................................................................................................55
8.21 Manual circuit function ............................................................................................56
9. Protection function.......................................................................................................56
9.1 Memory function during power failure.......................................................................56
9.2 Screen protection......................................................................................................56
10 Trouble checking........................................................................................................56
11. Quality Guarantee .....................................................................................................57
12. Accessories...............................................................................................................58

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1. Safety information
1.1 Installation and commissioning
When laying wires, please ensure that no damage occurs to any of the constructional
fire safety measures presented in the building.
The controller must not be installed in rooms where easily inflammable gas mixtures are
present or may occur.
The permissible environmental conditions can’t be exceeded at the site of installation.
Before connecting the device, make sure that the energy supply matches the
specifications that controller requires.
All devices connected to the controller must conform to the technical specifications of
the controller.
All operations on an open controller are only to be conducted cleared from the power
supply. All safety regulations for working on the power supply are valid.
Connecting and /or all operations that require opening the collector (e.g. changing the
fuse) are only conducted by specialists.
1.2 About this manual
This manual describes the mounting, functions and operation of a solar controller used for a
solar hot water system, for mounting of other devices of a completed solar hot water system
like solar collector, pump station and storage, please is sure to observe the appropriate
installation instructions provided by each manufacturer. Mounting, wire connecting,
commissioning and maintenance of this controller may only be performed by the trained
professional person; the professional person should be familiar with this manual and follow
the instructions contained herein.
1.3 Liability waiver
The manufacturer can’t monitor the compliance with these instructions or the circumstances
and methods used for installation, operation, utilization and maintenance of this controller.
Improper installation can cause damages to material and person. This is the reason why we
do not take over responsibility and liability for losses, damages or cost that might arise due to
the improper installation, operation or wrong utilization and maintenance or that occurs in
some connection with the aforementioned. Moreover we do not take over liability for patent
infringements or infringements –occurring in connection with the use of this controller on the
third parties rights. The manufacturer preserves the right to put changes to product, technical
data or installation and operation instructions without prior notice. As soon as it becomes

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evident that safe operation is no longer possible (e.g. visible damage). Please immediate
take the device out of operation. Note: ensure that the device can’t be accidentally placed
into operation.
1.4 Important information
We have carefully checked the text and pictures of this manual and provided the best of our
knowledge and ideas, however inevitable errors maybe exist. Please note that we cannot
guarantee that this manual is given in the integrity of image and text, incorrect, incomplete
and erroneous information and the resulting damage we do not take responsibility.
1.5 Signal description
Safety indication: Safety instructions in the text are marked with a warning triangle.
They indicate measures which can lead to injury of person or safety risks.
Operation steps: small triangle “►”is used to indicate operation step.
Note：contains important information about operation or functions.
1.6 Button and HMI description

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Nr.
Button
1
Power indication lamp
2
“On/Off”
3
“Clock”
4
“Holiday”
5
“Manual Heating”
6
“Manual Circuit”
7
“Eco Mode”
8
“ESC”
9
“SET”
10
Upwards adjust “+”
11
Downwards adjust “-”
12
LCD Display screen
Status Description
Code
Lighting
Blinking
Exceed the maximum temperature
of storage
SMX
Running of storage emergency
shutdown function
Running of collector emergency
shutdown function
OCEM
╋
Running of collector cooling
OCCO
Running of tank cooling function
OSTC
Start of anti-freezing function
OCFR
Running of anti-freezing function
OCFR
2 Overview
2.1 Technical data
Input:
1* Pt1000 temperature sensor
5* NTC10K, B=3950 temperature sensor
1* Grundfos Direct Sensor TM (VFS) analog input
1* FRT digital flow meter
Output:

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1 * Semiconductor relay, Max current: 1A
2 * Electromagnetic relay, Max. Current: 2A
1 * Electromagnetic relay, Max. Current: 10A
1 * Low voltage relay for linkage with HR（on/off signal）
1* PWM frequency control output (0-10V)
Function: running time accumulation, tube collector function, timing heating function,
pump speed control, thermal energy measuring, external heat exchanger, system
parameters adjust, optional function adjust (menu), balance and diagnose function.
Power supply: AC100…240V ~(50…60Hz)
Rated impulse voltage: 2.5KV
Housing: Plastic ABS
Mounting: Wall mounting
Operation: 10 push buttons at the front cover
Protection type: IP40
Dimension of display: 120*120*18mm
Dimension of controller board: 200*140*43mm
Note: there are 5 inputs for NTC10K, B=3950 temperature sensor, but only 4 sensors
are included in the standard delivery list; the other one should be purchased separately by
customer if necessary.
2.2 Delivery list
1 * SR81Q controller
1 * accessory bag
1 * user manual
1 * PT1000 temperature sensor (φ6*50mm,cable length 1.5meter)
4 * NTC10K temperature sensor (φ6*50mm,cable length 3meter)
1 *10A power cable
3. Installation
Note: The unit must only be located in the dry interior rooms. Please separate
routing of sensor wires and mains wires. Make sure the controller as well as the system is
not exposed to strong electromagnetic fields.

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3.1 Mounting the display of controller
►Using Screw and turn it, take the display base plate out, see picture 1
►Fixing the base on the wall with screw (see picture 2), (Note: don’t drill hole on the base
plate)
►Insert the display into the base plate groove ①②, and press it tightly. See picture 3
3.2 Mounting the board of controller
Follow the below steps to mount the controller on the wall.
►Select the proper place to install main board of
controller
►Put the hung housing plate on the wall and mark the
upper fastening point.
►Drill the holes and put the plastic expansion bolt into
the holes.
►Hang the housing plate on the screw and fasten it
►Hang the controller on the housing plate.
3.3 Preparation before wiring connection
Open/close the cover of connection terminal.
►Unscrew the screw ①②, and take out the cover
upwards
►Close the cover: close the cover downwards
►Fix the cover with the screw ①②
3.4 Wiring connection
Note: Power can only be switched-on when the controller housing is closed. Installer
should be sure that the IP safety protection grade of controller isn’t damaged during
installation.
According to the way of installation, wire can be connected from hole ④on the bottom plate

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or from hole ⑤, using a suitable tool (like knife) to cut the plastic of ⑤, and wire is
connected into housing from hole ⑤.
Note: wires must be fastened by fixing clamps on the position⑥.
3.5 Terminal connection
Note: before opening the housing! Always disconnect the controller from power
supply and obey the local electrical supply regulation.
Input ports
T1: PT1000 temperature sensor, for measuring the temperature of collector
T2 ~T6: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
HK-A,HK-B: on/off signal, ( HK and HR triggered or stopped synchronously, for boiler
heating controller)
PWM: for high efficiency pump, connection see pump terminal connection diagram
VFS: connect Grundfos flow sensor
FRT: For rotary vane type electronic flowmeter

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Output ports
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire,
with 10A power plug.
Output R1: semiconductor relay, Max. Current: 1A
Output R2: Electromagnetic relay, Max. Current: 2A
Output R3: Electromagnetic relay, Max. Current: 2A R3
Output HR: Electromagnetic relay, designed for on/off control of back-up heating
device, Max. Current: 10A ( @AC230V, for 1500W electrical heater, @110VAC, for
750W electrical heater)
Advice regarding the installation of temperature sensors:
Only original factory equipped Pt1000 temperature sensors are approved for using with
the controller, it is equipped with 1.5m silicon cable and suitable for all weather
conditions, the cable is temperature resistant up to 280oC, connect the temperature
sensors to the corresponding terminals with either polarity.
Only original factory equipped NTC10K,B=3950 temperature sensors are approved for
using with tank and pipe, it is equipped with 3m PVC cable, and the cable is
temperature resistant up to 105oC, connect the temperature sensors to the
corresponding terminals with either polarity.
All sensor cables carry low voltage, and to avoid inductive effects, must not be laid close
to 230 volt or 400 volt cables (minimum separation of 100mm).
If external inductive effects are existed, e.g. from heavy current cables, overhead train
cables, transformer substations, radio and television devices, amateur radio stations,
microwave devices etc., then the cables to the sensors must be adequately shielded.
Sensor cables may be extended to a maximum length of ca. 100 meter, when cable’s
length is up to 50m, and then 0.75mm2cable should be used. When cable’s length is up
to 100m, and then 1.5mm2cables should be used.

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3.6 R3 output connection with T- valve / pump
3 wires T-Valve 2 wires T-Valve
Connection with pump
R3 connect with T-valve: (COM common terminal, NO always open terminal, NC always
close terminal)
R3 connect with pump: (COM common terminal, NO always open terminal)
3.7 Connection with high efficiency pump

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Wire connection with high efficiency pump
Signal wire 1 of high efficiency pump is connected with GND terminal of controller
Signal wire 2 of high efficiency pump is connected with PWM terminal of controller
Signal wire 3 of high efficiency pump is not connected with controller
Some pumps connections are available as above, for example:
Wilo Yonos PARA ST15/7.0 PWM2 M
Grundfos UPM3 SOLAR 15-75 130 CZA
Note:
1. High-efficiency pump with 0-10V signal only has 2 signal wires, connected to the
corresponding port GND, PWM1 of controller.
2. Blue wire not always represent for “GND”and brown wire not always represent for
“PWM”.
”PWM”from pump must be match for “PWM”from controller.
”GND”from pump must be match for “GND”from controller.

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4. System description (Standard solar system with 1 tank, 1 collector field)
Description:
The controller calculates the temperature difference between collector sensor T1 and tank
sensor T2. If the difference is larger than or identical to the adjusted switch-on temperature
difference, the solar circulation pump (R1) will be switched on and the tank will be loaded
until the switch-off temperature difference or the maximum tank temperature is reached.
Sensor
ports
Description
Relay
outputs
Description
T1
Collector temperature
sensor PT1000
R1
For solar circuit pump
T2
Temperature sensor on the
bottom part of tank.
NTC10K
R2
1. for DHW circuit function
（CIRC）
2.OHDP （Thermal energy
transferring, R2,R3 can be
selected）
T3
Temperature sensor on the
upper part of tank. NTC10K
T4
Temperature sensor on
DHW Pipe. NTC10K
R3
1.TIME（Timer function）
2.AH（Automatic thermostat
function
3. OPAR ( Parallel relays
function)
T5
Temperature sensor
NTC10K ( function is not
defined)
T6
Temperature sensor for flow
pipe of DHW function
NTC10K
HR
For back-up heating
1. Note: Functions AH, TIME, OPAR all are designed to use output R3, when one of these
three functions (AH, TIME, OPAR) is activated, and then the other two will be
deactivated automatically.

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5. Time setup
Before switch-on the power, please connect sensor on the inputs terminal, connect
pump or on/off valve on the outputs terminal. After the power is switched-on, you can set the
time, password and parameters of system.
►Press “Clock” button, Time displays on the screen, hour
“00” blinks on the display.
►Press “+/-” button, to adjust hour
►Press “Clock” button again, minute time “00” blinks on the display
►Press “+/-” button to adjust minute
►Press “ESC” button to save the set value
Note: In the case that power to controller is switched-off, date and time will be
memorized in controller for 36 hours.
6. Function’s parameters and options
6.1 Overview of menu structure

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6.2 Menu operation description
Access main menu
►Press “SET” button to access main menu
►Press “+/-” to select menu
►Press “SET” button to enter the submenu
Access submenu
►After selecting main menu, then press “SET” button to access submenu
►Press “+/-” button to select submenu,
►Press “SET” button to enter the value adjust window or function selection window
►Press “+/-” to adjust value
►Press “SET” or “ESC” to confirm the value you set
►Press “ESC”, exit the submenu.
Note: Enter the menu adjustment interface, if you don’t press any button within 3
minutes, screen will exit the adjustment and turn to main interface.
6.3 Value checking and function checking
At the normal operation mode, press “+/-” button, you can
view the temperature of collector and tank, pump speed
( n1%), accumulation running time of circuit pump (hR1),
daily thermal energy (DKWh), accumulation thermal energy ( kWh or MWh), flow rate (L/M),
controller running time (DAYS), software version (SW).
Under the checking status, when digital flow meter (FRT) is out of work, (L/M, 0.0) is
displayed on the screen, you can quickly switch off digital flow meter FRT, doing like below
steps:
►Press “+/-“button, select flow rate, (L/M 0.0) appears
►Press “SET” for 3 seconds, beeper makes a sound “du…….” 3 times, and then press
“ESC” button, to switch off the digital flow meter.
Note:
Flow rate display, sterilization function, auxiliary function and parallel relays function can
only be displayed only when the function is activated.
When sterilization function is running, sterilization time can be checked, when auxiliary

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function is running, corresponding signal blinks on the screen
SW: screen version, SW-M: controller version
DAYS: running time of display, MDAY: running time of controller
Thermal energy is showed as kWh under kWh channel, is showed as MWh under MWh
channel, total accumulation of thermal energy produced by solar system is the plus of
kWh + MWh
Enter the value check interface, if you don’t press any button within 3 minutes, screen
will exit the check interface and turn to main interface.
7. Functions operation and parameters setting (for user)
7.1 THET Timing heating
Function description:
Electrical heater or gas / oil boiler is normally used as back-up heating source of a solar hot
water system. Through this timing heating function controller can keep the tank temperature
constantly. When tank temperature (T3) drops below the switch-on thermostats temperature,
back-up heating output HR is triggered, when T3 rises up to the switch-off thermostats
temperature, HR is ceased.
Set time sections and temperature for timing heating daily
Factory set:
The first time section: default at 4:00 to start heating, and at 5:00 to stop heating, and
the switch-on temperature of heating is 40oC，switch-off temperature is 50oC。
The second time section: default at 10:00 to start heating, and at 10:00 to stop heating,
and the switch-on temperature of heating is 50oC，switch-off temperature is 55oC。
The Third time section: default at 17:00 to start heating, and at 22:00 to stop heating,
and the switch-on temperature of heating is 50oC，switch-off temperature is 55oC。
If you set the start time and close time with a same value, which means within this time
section, the timing heating function is switched-off. For example, at the second time section,
start time is set at 10:00, but close time is also set at 10:00.
Timing heating function is run at the preset time section, 3 time sections can be set, and
within every time section, the desired temperature may be different. The adjustable range of
switch-on temperature is 0oC ~ (OFF-2oC), switch-off temperature range is (ON+2oC) ~
95oC.
SMT Intelligent heating

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At the case that solar energy is insufficient to heat the tank, in order to ensure user has
sufficient hot water, controller will check the temperature of tank automatically at the preset
time, if tank’s temperature is not reached to the desired temperature, then back-up heat
device will be triggered, and when tank’s temperature rises up to the desired value, then
back-up heat device stops.
Factory set: （impossible to be adjusted）
Default at 13:00 of the first time section to trigger the back-up heat device to heat tank to
30oC,
Default at 14:00 of the second time section to trigger the back-up heat device to heat
tank to 35oC,
Default at 15:00 of the third time section to trigger the back-up heat device to heat tank
to 40oC,
Default at 16:00 of the forth time section to trigger the back-up heat device to heat tank
to 45oC,
Default at 17:00 of the fifth time section to trigger the back-up heat device to heat tank to
50oC.
Note：
If larger power electrical heater (larger than 1500KW) is used, according to the power, we
suggest configuring a contactor and a safety protection device, we suggest strongly installing
an accessory “SR802” (see detailed in item No.12)
Menu Structure
Main
menu
Subm
enu
Factory
set
Adjustable
range
Step
per
adjust
Description
THET
Timing heating function

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THTS
S2
S2. S3
Select desired sensor of heated
tank (S3 for T3, S2 for T2)
SMT
OFF
ON/OFF
Intelligent heating Mode
tH1O
04:00 /
40℃
00:00-23:59/
0-93℃
Switch-on time and temperature
of the first heating section
tH1F
05:00/
50℃
00:00-23:59/
2-95℃
Switch-off time and temperature
of the first heating section
t H2O
10:00 /
40℃
00:00-23:59/
0-93℃
Switch-on time and temperature
of the second heating section
tH2F
10:00 /
50℃
00:00-23:59/
2-95℃
Switch-off time and temperature
of the second heating section
tH3O
17:00 /
50℃
00:00-23:59/
0-93℃
Switch-on time and temperature
of the third heating section
tH3F
22:00 /
55℃
00:00-23:59/
2-95℃
Switch-off time and temperature
of the third heating section
Function setting:
►Press “SET” button to access main menu, and select
THET timing heating menu.
►Press “SET” button to set parameter, firstly to select the
desired sensor for the heated tank, “THTS S3” displays on the screen.
►Press “SET” button, “S3” blinks
►Press “+/-” button to select desired sensor
►Press “SET” or “ESC” button to save the setting.
►Press “+” button to access submenu of the intelligent heating, “SMT OFF” displays on the
screen
►Press “SET” button, “OFF” blinks
►Press “+/-” button to activate this function
►Press “SET” or “ESC” button to save the setting.
►Press “SET” button to access the window of the switch-on time and temperature of the first
heating section, “th1O 04：00” displays on the screen.
►Press “SET” button, hour time “04” blinks
►Press “+/-” button to adjust hour of the switch-on time
►Press “SET” button, minute time “00” blinks
►Press “+/-” button to adjust minute of the switch-on time
►Press “SET” button, temperature “40” blinks
►Press “+/-” button to adjust the switch-on temperature

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►Press “SET” or “ESC” button to save the setting.
►Press “+” button to access the window of the switch-off time and temperature of the first
heating section, “th1F 05：00” displays on the screen
►Press “SET” button, hour time “05” blinks
►Press “+/-” button to adjust hour of the switch-off time
►Press “SET” button, minute time “00” blinks
►Press “+/-” button to adjust minute of the switch-off time
►Press “SET” button, temperature “50” blinks
►Press “+/-” button to adjust the switch-off temperature
►Press “SET” or “ESC” button to save the setting.
►Press “+” button to access the window of the switch-on time and temperature of the
second heating section, repeat above steps to set time and temperature for the second and
third heating section.
Note: definition of timing heating sign
1) Within the preset time section, if timing heating isn’t working, heating sign is
lighted on the screen
2) Within the preset time section, if timing heating is working, heating sign blinks
on the screen.
3) Out of the preset time section, heating sign doesn’t display on the screen.
7.2 CIRC DHW circulation pump controlled by temperature and time
Function description:
This controller provides an output for running DHW circulation pump, which can be controlled
by a temperature sensor, at this case, an extra circuit pump (connect to the output R2) and
an extra temperature sensor installed on the hot water return pipe (connect to the input T4)
should be installed in the system. When the temperature of DHW return is lower than the
preset switch-on temperature, circuit pump is triggered, until temperature rises up to the
switch-off temperature, pump is stopped.
2 controlling modes are designed for running DHW circulation pump
Time controlled DHW pump within the preset 3 time sections (default Mode)

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Within a time section, if DHW circulation pump is
controlled by time, at this case, only an extra circuit pump
(connect to output R2) is needed. Pump is triggered by
time, within a running time section, as default set, pump
runs for 3 minutes (adjustable range 0-30 minutes) and
then ceases for 15 minutes (adjustable range 0-60
minutes), same process repeated within the running time
section.
Note: if the ceased time (CYCF) is set to 0 minute, it means within this time section,
circuit pump keeps running without any stop.
Default time section:
The first time section: starts at 05:00, stops at 7:00, runs 3 minutes, then stops 15
minutes
The second time section: starts at 11:00, stops at 13:00, runs 3 minutes, then stops 15
minutes
The first time section: starts at 17:00, stops at 22:00, runs 3 minutes, then stops 15
minutes
Temperature controlled DHW pump within the preset 3 time sections
within a time section, when the DHW circulation pump is
controlled by temperature, as default set, pump R2 is
triggered when return temperature T4 is below 40oC, and
it is stopped when T4 rises up to 45oC,
There is a precondition for triggering the DHW circuit
pump (set in submenu STAT):
START ON: tank’s temperature sensor (default T3) is
2oC higher than the preset switch-off temperature, and then DHW circuit pump can be
triggered.
Note: two Modes can’t play at the same time, when time controlled Mode is selected,
then temperature controlled Mode STAT can’t be activated.
Default time section:
The first time section: starts at 05:00, stops at 7:00, runs at 40oC，stops at 45oC