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SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater

SR91/SR868C9 is used in a split pressurized solar water heater system.
  • SR91/SR868C9
  • Applicable to SFBS/SFFS/SFES
  • Integrated circuit/ABS
  • Control solar heating system intelligently
  • Suitable for split pressurized solar water heater
  • 1 year
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1. Product Description

1.1 Overview

  • SR91 is an upgraded version of the SR868C9.

  • SR91 is used in a split pressurized solar water heater system.

  • Intelligently controlled by the latest high-performance microcontroller from NXP.

  • All devices use industrial-grade standards to operate in cold, high-temperature, and humid environments, while using a clock chip for precise timing control.

  • The controller is LCD type, with beautiful appearance, stable and reliable performance, easy to install, as the most ideal accessory product for split pressure solar water heater.


SR208C Solar Controllers for Split Pressurized Solar Water Heater-p1.1

1.2 Applications Capacity

  • Max.number of collectors:1

  • Max.number of storage tanks:1

  • Max.number of relays:4

  • Max.number of sensors:5

  • Max.number of visualization application system: 1

SR208C Solar Controllers for Split Pressurized Solar Water Heater-p1.2


1.3 Main functions

  • CLK time setting
  • THET timing auxiliary heating
  • CIRC water end circulating pump temperature/time control function for three periods
  • PWD password input
  • LOAD tank heating setting
  • COL collector function
  • OCEM collector emergency shutdown function
  • OCCO collector cooling
  • Minimum temperature of OCMI collector
  • Anti-freezing function of OCFR collector
  • COOL cooling function
  • OSTC tank cooling
  • OHDP thermal transfer
  • TIME timer function
  • AH automatic temperature regulation function
  • BEEP buzzer fault alarm function
  • MAN manual function
  • BLPR blocking protection function
  • OTDI high temperature sterilization function
  • FS flow monitoring and pump idling protection
  • UNIT conversion between Celsius and Fahrenheit
  • RET reset
  • PASS password setting
  • M.H manual heating
  • Economic model
  • Manually start the water-end circulating pump
  • Holiday function
  • Protection function
  • Power off memory protection
  • The screen saver

1.4 Delivery scope

SR208C Solar Controllers for Split Pressurized Solar Water Heater-p1.4


2. Technical Parameters

2.1 Technical Parameters

SR208C Solar Controllers for Split Pressurized Solar Water Heater-p2.1


2.2 Optional accessories

2.2.1 Electromagnetic relay : SR802,can control electric heating of ≤4000W.

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Contactor unit of high power: SR802


When user selects electrical heater as back-up device, we recommend using SR802 unit connecting controller and electrical heater.

Technical data of SR802 Dimension: 100mmx100mmx65mm.

Power supply: 180V ~ 264V / AC 50 / 60Hz.

Suitable power: ≤ 4000W.

Available ambient temperature: -10 ~ 50oC Water proof grade: IP43.



SR802 Connection Diagram:

SR802安装示意图


2.2.2 Digital flow counter FRT

SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater-p2.2.2



3. Product Installation

3.1 SR91 Installation diagram

SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-1


SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-2


SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-3


3.2 SR91 Installation manual download:

operation instruction SR91


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