SR91SR868C9 Solar Controllers for Split Pressurized Solar Water Heater

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.

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

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

2.1 Technical Parameters

2.2 Optional accessories

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

SR802 Connection Diagram:

2.2.2 Digital flow counter FRT

3.1 SR91 Installation diagram

3.2 SR91 Installation manual download:

operation instruction SR91