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

Instruction of SR81 Split Pressurized Solar Hot Water System
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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

Instruction of SR81 Split Pressurized Solar Hot Water System
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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.

Instruction of SR81 Split Pressurized Solar Hot Water System
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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.

Instruction of SR81 Split Pressurized Solar Hot Water System
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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,