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SR258 Solar Controllers for Split Pressurized Solar Water Heater

SR258 is a controller used in a split pressurized solar water heater system.
  • SR258
  • Applicable to SFBS/SFES/SFFS
  • 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

  • SR258 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.


SR258 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 temperature sensor:5

  • Max.number of circulation pump or valve:3

  • Max.number of electronic flowmeter:1

  • Max.number of electromagnetic relays:4

  • Max.number of auxiliary electric heating:1


SR258 Solar Controllers for Split Pressurized Solar Water Heater-p1.2


1.3 Main functions

  • LCD---display

  • CLK---time setting

  • THET---Timed auxiliary heating

  • CIRC---water-side circulating pump three-time temperature/time control function

  • LOAD---water tank heating setting

  • COL---collector function

  • OCEM---heat collector emergency shutdown function

  • OCCO---collector cooling

  • OCMI---the lowest temperature of the collector

  • OCFR---heat collector antifreeze function

  • PUMP---Water pump control mode (high efficiency pump speed control)

  • COOL---cooling function

  • OSTC---water tank cooling

  • OHDP---heat transfer

  • MAN---manual function

  • BLPR---blocking protection

  • OTDI---high temperature sterilization function

  • FS---Flow monitoring and pump idling protection

  • UNIT---Conversion of Celsius and Fahrenheit

  • BEEP---Buzzer fault alarm function

  • RET---reset

  • PASS---Password setting

  • M.H---manual heating

  • Holiday function

  • Screen Protection

  • Trouble Protection

  • Trouble Checking


1.4 Delivery scope

SR258 Solar Controllers for Split Pressurized Solar Water Heater-p1.4


2. Technical Parameters

2.1 Technical Parameters

SR258 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 ~ 50°C Water proof grade: IP43.



SR802 Connection Diagram:

SR258 Solar Controllers for Split Pressurized Solar Water Heater-p2.1.1-2


2.2.2 FRT  digital flow meter

SR258 Solar Controllers for Split Pressurized Solar Water Heater-p2.2.2


3. Product Installation

3.1 SR258 installation diagram

SR258 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-1


SR258 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-2


SR258 Solar Controllers for Split Pressurized Solar Water Heater-p3.1-3


3.2 SR258 Installation manual download:

Operation Manual of the Intelligent Controller SR258

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