Shuangri Electron SR288 User manual

Operation Manual of the Intelligent
Controller SR288
for Split Pressurized Solar Hot Water System
Please read the instruction carefully before operation!

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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 controller................................................................................................. 6
3.2 Wiring connection................................................................................................... 7
3.3 Terminal connection................................................................................................ 7
3.4 R3 ports for 3-ways valve / pump connection.......................................................... 9
3.5 Connection with high efficiency pump..................................................................... 9
4. System description (Standard solar system with 1 tank, 1 collector field)................ 10
5. Function’s parameters and options ......................................................................... 12
5.1 Overview of menu structure.................................................................................. 12
5.2 Menu operation description .................................................................................. 12
5.3 Value checking ..................................................................................................... 13
5.4 Function checking ................................................................................................ 13
6. Functions operation and parameters setting (for user)............................................ 14
6.1 CLK Time setup.................................................................................................... 14
6.2 THET Timing heating............................................................................................ 14
6.3 CIRC DHW circulation pump controlled by temperature or by time ....................... 17
7. Function operation and parameter setup (for engineer) .......................................... 22
7.1 PWD Password.................................................................................................... 22
7.2 LOAD tank heating............................................................................................... 22
7.3 COL Collector function.......................................................................................... 25
7.4 PUMP Pump control mode................................................................................... 30
7.5 COOL Cooling function......................................................................................... 33

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7.6 AUX Auxiliary function .......................................................................................... 37
7.7 MAN Manual operation......................................................................................... 41
7.8 BLPR Blocking protection..................................................................................... 42
7.9 OTDI Thermal Disinfection function ...................................................................... 42
7.10 OPAR Parallel relay............................................................................................ 44
7.11 OHQM Thermal quantity measurement............................................................... 45
7.12 FS Flow meter selection and flow rate monitoring............................................... 48
7.13 UNIT C-F Switch................................................................................................. 50
7.14 RET Reset.......................................................................................................... 50
7.15 PASS Password setup........................................................................................ 51
7.16 M.H Manual heating ........................................................................................... 52
7.17 Holiday function.................................................................................................. 52
8. Protection function.................................................................................................. 53
8.1 Memory function during power failure................................................................... 53
8.2 Screen protection ................................................................................................. 53
8.3 Trouble checking .................................................................................................. 53
9. Quality Guarantee .................................................................................................. 54
10. Accessories.......................................................................................................... 55

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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 the controller requires.
All devices connected to the controller must be conformed 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 the responsibility and liability for losses, damages or cost that might arise
due to 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 indications 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
Controller is operated with the 6 buttons on the right side of the screen
“ " holiday button
“M.H” button: manual heating
“SET” button: confirm / selection
“▲” up button: increase the value
“▼” down button: reduce the value
“ESC" button return/ exit : return to previous menu

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Status description
Code
Lighting
Blinking
Exceed the maximum temperature of storage
SMX
Running of storage emergency shutdown
function
Running of collector emergency shutdown
function
CEM
+
Collector Cooling
OCCO
Tank Cooling
OSTC
System Cooling
OSYC
Start of anti-freezing function
OCFR
Running of anti-freezing function
OCFR
Collector minimum temperature
OCMI
Slow blink
2. Overview
2.1 Technical data
Inputs: 1 * PT1000 temperature sensor input
5 * NTC10K, B=3950 temperature sensor input
1 * Grundfos Direct Sensor TM (VFS) simulation input
1 * FRT rotary vane type electronic flow meter
1 * 485 communication port
Outputs: 2 * Electromagnetic relay, maximum current 2A
2 * Semiconductor relay, maximum current 2A
1 * Potential-free extra-low voltage relay (on/off signal), possible combined
with HR controller
2 * PWM variable frequency output (on/off switchable, 0-10V)
Functions: operating hours counter, tube collector function, thermostat function, pump
speed control, heat quantity measurement, external heat exchange, adjustable system
parameters and optional functions (menu-driven), balance and diagnostics
Power supply: 100…240V ~(50…60Hz)
Rated impulse voltage: 2.5KV
485 current supply：60mA
Housing：Plastic ABS
Mounting：Wall mounting

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Operation: 6 push buttons at the front cover
Protection type: IP41
Ambient temperature: 0 ... 40 °C
Dimensions: 187*128*46mm
Note: there are 5 inputs for NTC10K, B=3950 temperature sensor, but only 4 sensors
are included in standard delivery list, the other one should be purchased separately by
customer if necessary.
2.2 Delivery list
1 * SR288 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)
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.
3.1 Mounting controller
Follow the below steps to mount the controller on the
wall.
Unscrew the crosshead screw from the cover and
remove it along with the cover from the housing.
Mark the upper fastening point ①on the wall.
Drill and fasten the enclosed wall plug and screw
leaving the head protruding.
Hang the housing from the upper fastening point
and mark the lower fastening points ②.
Drill and insert lower wall plugs.
Fasten the housing to the wall with the lower fastening screw and tighten.
Carry out the electrical wiring in accordance with the terminal allocation
Put the cover on the housing.Attach with the fastening screw.

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3.2 Wiring connection
According to the way of installation, wire can be connected from hole A on the bottom plate
or from hole B, using a suitable tool (like knife) to cut the plastic of A.
Note: wires must be fastened by fixing clamps on the position C.
3.3 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 and thermal
energy calculation.
T2 ~T6: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipe.
Communication port 485(selectable) : ELA485, for remote control communication
(WIFI model should be purchased seperetely, detailed see annexed part)
HK-A, HK-B: Dry connection on/off signal ports, (HK and HR simultaneously open or
close, for boiler heating control)
PWM1, PWM2: Signal ports for high efficiency pump, detailed connection see below
VFS: For Grundfos flowmeter sensor
FRT: For rotary vane type electronic flowmeter

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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.
Output ports
FU1：2A/250V fuse
Input Ports L, N: for power connection, L: live wire, N: zero wire, protective wire
Output R1: Semiconductor relays (SCR), designed for pump speed control, Max.
Current: 2A
Output R2: Semiconductor relays (SCR), designed for pump speed control, Max.
Current: 2A
Output R3: Electromagnetic relays, designed for on/off control of pump or 3-ways
electromagnetic valve, Max. Current: 2A
Output HR: Electromagnetic relays, designed for on/off control of after
heating/thermostat function, Max. Current: 2A

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3.4 R3 ports for 3-ways valve / pump connection
3 wires T-valve 2 wires T-valve
Pump connection
When R3 is for controlling 3 ways electromagnetic valve,（3 is normally open port, 2 is
normally close port ,1 is common port）
When R3 is for controlling pump, (3 is normally open port, 1 is common port)
3.5 Connection with high efficiency pump
Connecting the signal wire from the high-efficiency pump

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Signal wire 1 from the high-efficiency pump is connected to GND port of controller
Signal wire 2 from the high-efficiency pump is connected to PWM1 port of controller
Signal wire 3 from the high-efficiency pump is not connected to the controller
Some pumps connections are available as above, for example:
Wilo Yonos PARAST15/7.0 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.
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
Description
Relay
Description
T1
Temperature of collector Pt1000
R1
Solar circulation pump
T2
Temperature of tank base NTC10K
R2
Available selectable functions:
1.HEAT (Heat exchange between tanks)
2.OHDP（Thermal transfer,R2 or R3
selectable）
3.SFB（Solid fuel boiler）
T3
Temperature of tank upper
( selectable) NTC10K
T4
Selectable sensor, free, NTC10K
R3
1. CIRC（DHW circulation）
2. OPAR（Parallel relay）
T5
Selectable sensor, free NTC10K
T6
Temperature on pipe for thermal
energy measurement ( selectable)
NTC10K
HR
After heating/thermostat function
Note:
1. Sometime, for one selected function, it needs an extra input to connect temperature
sensor or an extra output to control pump or electromagnetic valve, in the case all inputs
and outputs are in using, and then this selected function will not be triggered even when
you have activated it. Controller can distinguish it automatically and switch-off this
function.
2. When one of these three functions (HEAT, OHDP, SFB) is activated, and then the other
two will be deactivated automatically.
3. When one of these two functions (CIRC, OPAR) is activated, and then the other one will
be deactivated automatically.

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5. Function’s parameters and options
5.1 Overview of menu structure
5.2 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 interface or selection function (select

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ON/OFF)
►Press “▲/▼” to adjust value
►Press “SET” to confirm the value you set
Note: Enter the menu adjustment interface, if you don’t press any button in 3 minutes,
screen will exit the adjustment and return to the main interface.
5.3 Value checking
At the normal operation mode, press “▲/▼” button, you can view the temperature of
collector and tank, pump speed(n1%), accumulated pump running time(hR1), accumulated
thermal energy(KWh or MWh), flow rate(L/M), controller running time (DAYS), software
version (SW).
Under the checking status, when the digital flow meter is failed, (L/M 0.0) will display on the
flow meter, it is possible to quickly set the flow meter type to a fixed flow rate (mechanical
flow meter), doing follow steps:
►Press “▲/▼” button, select flow rate, (L/M 0.0) displays.
►Press “SET” button for 3 seconds, beeper sounds “du….” 3 times, and then flow rate is set
to a fixed value (read from mechanical flow meter). Electronic flow meter is switched off.
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
function is running, corresponding signal blinks on the screen
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.
5.4 Function checking
Under standby status, press “SET” button for 3 seconds, then press “▲/▼” button to check
the type of pump.

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6. Functions operation and parameters setting (for user)
6.1 CLK Time setup
Menu structure
►Press “SET” button, select CLK menu
►Press “SET” button, hour “00” blinks on the display.
►Press “▲/▼” button to adjust hour
►Press “SET” button, minute time “00” blinks on the
display
►Press “▲/▼” button to adjust minute
►Press “SET” or “ESC” button to save the set value
Note: In the case power to controller is switched-off, date and time will be remembered
in controller for 36 hours.
6.2 THET Timing heating
Electrical back-up heater can be installed in the solar system to ensure the tank’s
temperature meets the required temperature, this electrical heater can be controlled
automatically by this controller, when tank temperature T3 drops below the switch-on set
point of this function, electrical heater HR is triggered to heat tank up to the switch-off
temperature, and then electrical heater HR stops working.
It is possible to set three time sections for activating this function,
Factory default set:
The first time section: heating starts at 00:00am, stops at 23:59am
The second time section: heating starts at 00:00, stops at 00:00
The third time section: heating starts at 00:00, stops at 00:00
And switch on temperature is set at 40oC, switch-off temperature is set at 45oC
If you want to shut off one timing heating ,then you can set the turning on time and turning off
time with a same value(for example, set second start time tA2 O at 00:00 and set the stop
time tA2 F at 00:00)

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Every day three timing heating can be set, and the switch-on temperature adjustable range is
0℃～(OFF-2oC), switch-off temperature adjustable range is (ON+2oC) ～95oC.
Wire connection to boiler on/off signal.
Boiler on/off signal
（according to customer wish）
When boiler as back-up device is selected, then back-up heating (HK and HR) is controlled
by tank’s sensor T3 or T2 (selectable), if the T3’s or T2’s value is lower than the switch-on
temperature of back-up heating, the output relay HK and HR is switched on, when T3 or T2 is
higher than the switch-off temperature of back-up heating, the output relay HK and HR are
switched-off.
Note: If customer use electrical heater as back-up, please according to the power of
electrical heater to equip corresponding safety devices like contactor and breaker with this
controller, we strongly recommend equipping with SR802 device with this controller, (SR802
detailed technical data see item 10 Accessories)
Menu structure

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Main
menu
Submenu
Factory
set
Adjustable
range
Step per
adjust
Description
THET
Timing heating
THS
S3
S2. S3
Select desired sensor for
timing heating function
(S3 for T3, S2 for T2)
THO
40℃
0.5℃
Switch-on temperature of
timing heating
THF
45℃
0.5℃
Switch-off temperature of
timing heating
tH1O
00:00
00:00-23:59
Switch-on time of the first
timing heating
tH1F
23:59
00:00-23:59
Switch-off time of the first
timing heating
t H2O
00:00
00:00-23:59
Switch-on time of the
second timing heating
tH2F
00:00
00:00-23:59
Switch-off time of the
second timing heating
tH3O
00:00
00:00-23:59
Switch-on time of the third
timing heating
tH3F
00:00
00:00-23:59
Switch-off time of the third
timing heating
Function setting:
►Press “SET” button to access main menu, and press “▲” to select THEH timing heating
main menu.
►Press “SET” button to set parameter, select the reference
sensor of tank, “THS S3” displays on the screen.
►Press “SET” button, “S3” blinks
►Press “▲/▼” button to select desired sensor (S3 for T3, S2 for T2)
►Press “SET” or “ESC” button to save the setting.
►Press “▲” button, “THO 40oC” displays on the screen
►Press “SET” button, “40oC” blinks
►Press “▲/▼” button to adjust the switch-on temperature.
►Press “SET” or “ESC” button to save the setting.
►Press “▲” button, “THF 45oC” displays on the screen
►Press “SET” button, temperature “45oC” blinks
►Press “▲/▼” button to adjust the switch-off temperature.
►Press “SET” or “ESC” button to save the setting.
►Press “▲” button to set the first time section, start time “tH1O 04:00” displays on the

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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” or “ESC” button to save the setting.
►Press “▲” button, “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” or “ESC” button to save the setting.
►Press “▲” button to access the window of the switch-on time of the second time section,
repeat above steps to set time for the second and third time section.
When heating sign blinks on the screen, it indicates that timing-heating function is
activated.
Note:
The Sign represents whether timing heating function is on or off.
1. Within the preset time section, heating sign is lighted on the screen
2. Out of the preset time section, heating sign doesn’t display on the screen.
6.3 CIRC DHW circulation pump controlled by temperature or by time
Function description:
This controller provides an output for running DHW circulation pump, which can be controlled
by a temperature, at this case, an extra circuit pump (connect to the output R3 option) 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 the preset time section, when running of the DHW circulation pump R3 is controlled by
time, at this case, pump is triggered by time, as default set, pump R3 runs for 3 minutes

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(adjustable range 1-30 minutes) and then ceases for 15 minutes (adjustable range 0-60
minutes), same process repeated within the preset 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 setup:
The first time section: start at 05:00, stop at 7:00
The second time section: start at 11:00, stop at 13:00
The first time section: start at 17:00, stop at 22:00
Temperature controlled DHW pump within the preset 3 time sections
within the preset time section, when running of the DHW circulation pump is controlled by
temperature, as default set, pump R3 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 (T3 as priority
selection) 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 setup:
The first time section: start at 05:00, stop at 7:00
The second time section: start at 11:00, stop at 13:00
The first time section: start at 17:00, stop at 22:00
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 controlling 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
the sensor at 1.5m far to tank.

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3. Both control Modes and temperature control mode, the parameter set steps are same.
Menu structure:
Main
menu
Submen
u 1
Submen
u 2
Factory
set
Adjustabl
e 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 or
T2) 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
00:00-23:5
9
Switch-on time and
temperature for the first
time section
t C1F
07:00
00:00-23:5
9
Switch-off time and
temperature for the first
time section
t C2O
11:00
00:00-23:5
9
Switch-on time and
temperature for the
second time section