The SR81(DC12V) smart controller manual provides safety info, installation steps, operation instructions and troubleshooting for solar water‑heater systems.
The SR81(DC12V) is a wall‑mounted smart controller for split‑type solar water‑heater systems. It monitors collector and tank temperatures, controls pumps and auxiliary heating, and offers protection functions such as power‑off memory and freeze protection.
The manual covers safety guidelines, mechanical installation, wiring diagrams, sensor connections, menu navigation, time and holiday settings, functional options for users and professionals, and a detailed fault‑diagnosis section. This manual is written in Chinese.
| Power input | DC12V |
|---|---|
| Maximum heating power | 3000 W |
| Enclosure material | ABS plastic |
| IP protection rating | IP40 |
| Display dimensions | 120 mm × 120 mm × 18 mm |
Long‑press the Holiday key for 3 seconds, then use the +/- keys to set the number of holiday days (0‑99). Press Exit to save; the holiday icon will light on the display.
The controller includes power‑off memory protection, so after a power outage it restores the previous operating mode when power is restored.
The auxiliary heating relay (HR) can switch up to 15 A, suitable for heaters up to 3000 W.