SUNFLOWER SR81 Technical manual

Operation Instruction
SR81
Intelligent Controller
for Split Pressurized Solar Hot Water System
Please read this instruction carefully!

Instruction of SR81 Split Pressurized Solar Hot Water System
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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.................................................................................... 6
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
3.5.1 Terminal allocation of controller for electrical heater of 1500W .................................... 8
3.3.2 Terminal allocation of controller for electrical heater of 3000W/4000W ........................ 9
4. System description (Standard solar system with 1 tank, 1 collector field) ....................... 10
5. Time setup........................................................................................................................11
6. Function’s parameters and options.................................................................................. 12
6.1 Overview of menu structure........................................................................................... 12
6.2 Menu operation description........................................................................................... 12
6.3 Value checking and function checking........................................................................... 13
7. Functions operation and parameters setting (for user).................................................... 13
7.1 Timing heating............................................................................................................... 13
7.2 CIRC DHW circulation pump controlled by temperature and time................................. 17
8. Function operation and parameter setup (engineer)........................................................ 22
8.1 PWD Password ............................................................................................................. 22
8.2 LOAD tank heating...................................................................................................... 22
8.3 COL Collector function .................................................................................................. 24
8.4 COOL Collector function................................................................................................ 28
8.5 AUX Auxiliary function ................................................................................................... 31

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8.6 MAN Manual operation.................................................................................................. 36
8.7 BLPR Blocking protection.............................................................................................. 37
8.8 OTDI Thermal Sterilization Function.............................................................................. 38
8.9 FS Flow rate monitoring and pump dry-running protection............................................ 39
8.10 UNIT C-F Switch.......................................................................................................... 41
8.11 RET Reset................................................................................................................... 41
8.12 PASS Password set..................................................................................................... 42
8.13 Manual heating............................................................................................................ 43
8.14 ECO Economic mode.................................................................................................. 43
8.15 DHW circuit pump triggered manually......................................................................... 44
8.16 On/Off controller.......................................................................................................... 44
8.17 Holiday function........................................................................................................... 44
8.18 Manual circuit function................................................................................................. 45
9. Protection function........................................................................................................... 45
9.1 Memory function during power failure............................................................................ 45
9.2 Screen protection .......................................................................................................... 45
10 Trouble checking ............................................................................................................ 45
11. Quality Guarantee.......................................................................................................... 47
12. Accessories ................................................................................................................... 47

Instruction of SR81 Split Pressurized Solar Hot Water System
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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

Instruction of SR81 Split Pressurized Solar Hot Water System
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data or installation and operation instructions without prior notice. As soon as it becomes
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
“Exit”
9
“Adjust”
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
Power supply: 100…240V ~(50…60Hz)
Rated impulse voltage: 2.5KV
Housing：Plastic ABS
Mounting：Wall mounting
Operation: 10 push buttons at the front cover

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Protection type: IP40
1500W or 3000W/4000W of electrical heater should be remarked in the purchased
order
Dimension of display: 120*120*18mm
Dimension of controller board with 1500W output: 200*140*43mm
Dimension of controller board with 3000W/4000W output: 218*165*55mm
Note: there are 4 inputs for NTC10K, B=3950 temperature sensor, but only 2 sensors
are included in the standard delivery list; the other two should be purchased separately by
customer if necessary.
2.2 Delivery list
1 * SR81 controller
1 * accessory bag
1 * user manual
1 * PT1000 temperature sensor (φ6*50mm,cable length 1.5meter)
2 * NTC10K temperature sensor (φ6*50mm,cable length 3meter)
1 *10A power cable ( Note: controller for 3000W/4000W electrical heater has no power
cable delivered, user should prepare a cable of 2.5mm2)
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. For control 3000W/4000W electrical heaters,
an extra switch should be installed, and 2.5mm2cable should be used to connect electrical
heater to the terminals of controller.
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

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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 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 fromhole ④on the bottom plate
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.

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3.5 Terminal connection
Note: before opening the housing! Always disconnect the controller from power
supply and obey the local electrical supply regulation.
3.5.1 Terminal allocation of controller for electrical heater of 1500W
Input ports
T1: PT1000 temperature sensor, for measuring the temperature of collector
T2 ~T5: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
FRT: For rotary vane type electronic flowmeter
Display connection
Port 1: connect red wire (＋12V)
Port 2: connect white wire ( COM)
Port 3: connect black wire ( GND)
Note: please lead wire into indoors, and fix the cable outdoors.

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1500W Output ports
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire,
with 10A power plug.
Output R1: Electromagnetic relays, Max. Current: 2A
Output R2: Electromagnetic relays, Max. Current: 2A
Output R3: Electromagnetic relays, Max. Current: 2A R3
Output HR: Electromagnetic relays, designed for on/off control of back-up
heating device, Max. Current: 10A ( @AC230V, for 1500W electrical heater,
@110VAC, for 750W electrical heater)
3.3.2 Terminal allocation of controller for electrical heater of 3000W/4000W
Input ports
T1: PT1000 temperature sensor, for measuring the temperature of collector
T2 ~T5: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
FRT: For rotary vane type electronic flowmeter
3000W/4000W Output ports
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire, it
is better to use 2.5mm2 cable.
Output R1: Electromagnetic relays, for control pump or valve, Max. Current: 2A
Output R2: Electromagnetic relays, for control pump or valve, Max. Current: 2A
Output R3: Electromagnetic relays, for control pump or valve, Max. Current: 2A
3000W Output HR: Electromagnetic relays, designed for on/off control of back-up
heating device, Max. Current: 15A ( @AC230V, for 3000W electrical heater,
@110VAC, for 1500W electrical heater)
4000W Output HR: Electromagnetic relays, designed for on/off control of back-up
heating device, Max. Current: 20A ( @AC230V, for 4000W electrical heater,

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@110VAC, for 2000W 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.
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.

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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
T5
Temperature sensor for
thermostat function
NTC10K
HR
For back-up heating
1. Note: when R3 output is selected for OHDP function, other two functions AH, TIME will
be closed automatically. When one of these three functions (HEAT, OHDP, SFB) is
activated, and then the other two will be deactivated automatically.
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 power to controller is switched-off, date and time will be memorized
in controller for 36 hours.

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6. Function’s parameters and options
6.1 Overview of menu structure
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
Timing heating
DHW Circuit
Cool Function
Aux. Function
Digital flow
C-F Unit
Password
Manual Mode
Reset
Tank loading
Block protect
Password setup
Collector
Disinfection

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►Press “+/-” button to select submenu,
►Press “SET” button to enter the value adjust interface
►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
Under normal running status of controller, press “ +/-“ button
to check the measured value of temperature of collector and
tank, value of flow rate (L/M) , status of thermal sterilization
function , status of auxiliary functions , status of voltage of
battery(VOL), running time of display ( DAYS), running time of controller ( MDAY), program version
of display (SW), and program version of main controller (SW-M)
Note:
Flow rate, thermal sterilization function, auxiliary functions can only be displayed only when
these functions are triggered.
When thermal sterilization function is running, time of thermal sterilization can be checked.
When one of any auxiliary functions is running, its corresponding signal blinks on the display.
SW: program version of display, SW-M: program version of controller.
DAYS:running time of display; MDAY:running time of controller
When you already in the interface of value checking function, if no any button is pressed
within 3 minutes, the display will return to the main interface.
7. Functions operation and parameters setting (for user)
7.1 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
Factory set:
The first time section: default at 4:00 to start heating, and at 5:00 to stop heating, and

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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,
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
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：
1. If larger power electrical heater (larger than 1500KW) is used, according to the power, we
suggest using controller with 3000W or 4000Woutput.

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2. Please remark the power of electrical heater and the voltage used.
Menu Structure
Main
menu
Subm
enu
Factory
set
Adjustable
range
Step
per
adjust
Description
THET
Timing heating function
THTS
S3
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℃
0.5C
Switch-on time and temperature
of the first heating section
tH1F
05:00/
50℃
00:00-23:59/
2-95℃
0.5C
Switch-off time and temperature
of the first heating section
t H2O
10:00 /
40℃
00:00-23:59/
0-93℃
0.5C
Switch-on time and temperature
of the second heating section
tH2F
10:00 /
50℃
00:00-23:59/
2-95℃
0.5C
Switch-off time and temperature
of the second heating section
tH3O
17:00 /
50℃
00:00-23:59/
0-93℃
0.5C
Switch-on time and temperature
of the third heating section
tH3F
22:00 /
55℃
00:00-23:59/
2-95℃
0.5C
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.

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►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
►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

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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)
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

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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 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 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
The second time section: starts at 11:00, stops at 13:00, runs at 40oC，stops at 45oC
The first time section: starts at 17:00, stops at 22:00, runs at 40oC，stops at 45oC
If it is needed to close one time section, just set the start time and stop time at a same value
(e.g. 10:00 starts, 10:00 stops)
Note:
1) Only one control Mode can be selected, either time control mode or temperature control
mode.
2) If sensor T4 should be installed, in order to avoid measuring error, please ensure to
install sensor at 1.5m far to tank.
3) Both time control mode and temperature control mode, the parameter set steps are
same.

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Menu Structure
Main
menu
Subme
nu 1
Subm
enu 2
Factory
set
Adjustable
range
Step per
adjust
Description
CIRC
DHW circuit function
TCYC
OFF
ON/OFF
Activate / deactivate the
DHW circuit function
TEMP
OFF
Temperature control
DHW pump
TIME
ON
Time control DHW
pump
STAT
ON
ON/OFF
Tank temperature (T3 )
2oC higher than the
preset switch-off DHW
circuit temperature.
CYCO
40 ℃
/3min
5-53℃/1-30min
0.5 ℃
/1min
Switch-on temperature
or running time
CYCF
45 ℃
/15min
7-55℃/0-60min
0.5 ℃
/1min
Switch-off temperature
or stop time
t C1O
05:00
00:00-23:59
Switch-on time for the
first time section
t C1F
07:00
00:00-23:59
Switch-off time for the
first time section