SR658 Advanced Solar Water Heater Controller — ±0.1°C Precision, 19 Programmable Systems, 7 Relays
Product Introduction
The SR658 solar water heater controller is an advanced, highly programmable intelligent control system engineered for separated pressurized solar thermal systems. Featuring industry-leading temperature measurement accuracy of ±0.1°C, this controller supports up to 19 programmable application systems, making it one of the most versatile controllers in its class.
With support for both conventional and high-efficiency (HE) pumps via PWM signal ports, the SR658 offers unparalleled flexibility for complex solar thermal installations. Its 7-relay output system, 8-sensor input capability, and dual collector/dual tank support enable sophisticated multi-zone control strategies. The built-in TF (micro SD) card interface allows convenient firmware updates, ensuring the controller remains current with the latest features and improvements. Designed with IP41 protection and energy-efficient operation (< 2.5W), the SR658 is the premium choice for demanding separated pressurized solar system applications.
Key Features & Benefits
Ultra-precise temperature measurement: ±0.1°C accuracy for superior control precision
19 programmable application systems: Maximum flexibility for diverse solar thermal configurations
Dual collector & dual tank support: Manages up to 2 collectors and 2 storage tanks simultaneously
7 relay outputs: 3 electromagnetic relays, 3 semiconductor relays, 1 potential-free relay for versatile control
8 sensor inputs: 2×Pt1000 (≤500°C) for collectors + 6×NTC10K B3950 (≤135°C) for tanks
PWM variable frequency output: 3 PWM ports (switchable 0-10V) for HE pump control
Conventional & HE pump support: Compatible with both standard and high-efficiency pump systems
SD card firmware update: Easy field upgrades via TF (micro SD) card slot
Wide power supply range: AC100-240V, 50/60Hz for global compatibility
System-Monitoring-Display: LED display with background illumination for clear visualization
Comprehensive safety: IP41 protection, trouble protection, blocking protection, thermal disinfection
Thermal energy measurement (OHQM): Monitor system energy performance
Main Technical Specifications
| Parameter | Specification |
|---|---|
| Model | SR658 Solar Water Heater Controller |
| Housing Dimensions | 208mm × 158mm × 43mm |
| Power Supply | AC100–240V, 50/60Hz |
| Power Consumption | < 2.5W |
| Rated Impulse Voltage | 2.5KV |
| Data Interface | TF (micro SD) card slot |
| Housing Material | Plastic ABS |
| Protection Type | IP41 |
| Protection Class | Class I |
| Degree of Pollution | 2 |
| Mounting | Wall mounting |
| Display | System-Monitoring-Display, LED with background illumination |
| Operation | 5 push buttons at front cover |
| Temperature Measurement Accuracy | ±0.1°C |
| Collector Temperature Range | -10°C ~ 220°C |
| Tank Temperature Range | 0°C ~ 110°C |
| Max. Number of Collectors | 2 |
| Max. Number of Storage Tanks | 2 |
| Max. Number of Relays | 7 |
| Max. Number of Sensors | 8 |
| Suitable Power of Pump | 6 pumps possible to be connected |
| Backup Heating Power | 1pc ≤1500W |
| Sensor Inputs | 2×Pt1000 (≤500°C, silicon cable ≤280°C) for collector; 6×NTC10K B3950 (≤135°C, PVC cable ≤105°C) for tank |
| Relay Outputs | 3×Electromagnetic relay (Max. 1A); 3×Semiconductor relay (Max. 1A); 1×Potential-free extra-low voltage relay (on/off signal) |
| PWM Output | 3×PWM variable frequency output (switchable 0-10V) |
| Flowmeter Support | FRT: 1×Digital flowmeter sensor; VFS: 1×Grundfos flowmeter sensor |
| Programmable Systems | 19 visualization application systems |
| Ambient Temperature Range | -10°C ~ 50°C |
Full List of Functions
DATE — Date setting
Light — Display lightness adjustable
Timed heat — Backup heating scheduling
Circle — Hot water circulation
Sys — Application programmer (19 systems)
LOAD — Setup loading tank 1
LOAD2 — Setup loading tank 2
COL — Collector 1 control
COL2 — Collector 2 control
PUMP — Pump control mode
LLOGI — Tank loading logic
COOL — Cooling function
HEATX — Thermal energy transfer between tanks
RPH — Preheat heating return function
AUX — Auxiliary function
MAN — Manual mode
BLPR — Blocking protection function
OTDIS — Thermal disinfection function
OPARR — Parallel relay function
OHQM — Thermal energy measurement
GFDS — Registration of Grundfos sensor
UNIT — Celsius/Fahrenheit temperature unit switch
OSDS — SD card function
REST — Reset function
PASS — Password setting
Firmware update via SD card
Holiday function
Screen protection (screen saver)
Trouble protection system
Trouble checking / diagnostics
System Installation Diagram
Applications
The SR658 solar controller is specifically designed for separated pressurized solar thermal systems, including multi-zone residential solar heating installations, commercial and industrial solar thermal projects, dual-collector/dual-tank solar systems, and applications requiring high-efficiency pump control via PWM. Its 19 programmable systems, ultra-precise temperature measurement, and extensive relay/sensor capacity make it the ideal solution for complex solar thermal installations worldwide.
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|---|---|
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| Tag Labels | Solar Water Heater Controller|SR658|Separated Pressurized Solar System|Programmable Controller|0.1°C Accuracy|PWM Output|7 Relays|8 Sensors|SD Card Update|IP41 Protection|Dual Tank|Dual Collector |
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