Small Temperature Difference Controller for simple systems
For 9 solar, storage and solid fuel boiler-systems
The STDC is available in different versions with variable relay combinations. It can be equipped with or without speed-control of standard pumps, high-efficiency pumps or both, just according to your needs. 
 
Connections:
3 sensor inputs for Pt1000 temperature sensors
1 relay plus 1 optional PWM0-10V output
 
Features:
for 9 basic systems
Self-explanatory operation via 4 entry keys
Multilingual full-text menu with help texts and graphic mode with animations High-contrast lighted display with 128x64 dots
Function check and graphical system analysis with long-term memory for statistics about heat quantity and operating hours
RTC Real Time Clock with >24h power reserve
White housing RAL9003, protection class IP40, dimensions H 115mm W 86mm D 45mm
Mounting hardware, spare fuse and user manual
 
Basic systems:
Solar with storage
Solar with swimming pool
Solid fuel boiler with storage
Storage transfer
Return flow increase
Thermostat function
Universal Delta T
Stop valve
Solar with heat exchanger and pool (V3 and V4 only)
THIS CONTROLLER IS NOT SUITABLE FOR SPEED CONTROL OF A-RATED DOMESTIC HEATING PUMPS
 
STDC Version 3
Technical features
 
Temperature sensors Pt1000: 0
Relay outputs 230V* of which for speed control of standard pumps: 1 0
Outputs 0..10V or PWM signal: 1
VFSRPS sensors: 0
Number of applications: 9
LEDs redgreen for display of operating status: 0
Simple heat metering: Yes
Flow based heat metering (Grundfos VFS sensor): No
Pressure monitoring (Grundfos RPS sensor): No
Time and temperature-controlled thermostat function: Yes
Battery-backed Real Time Clock: Yes
Legionella protection via solar: Yes
Legionella protection via additional heating: No
Cooling function: No
Setup wizard: Yes
System protection: Yes
Collector protection: Yes
Storage protection: Yes
Anti-freeze programs: Yes
Recooling: Yes
Start logic for vacuum tube collectors: Yes
Control program for self-dumping systems (drain-back): No
Data storage with statistics and graphic analysis: Yes
Error memory and analysis with date and time: Yes
Menu blocker: Yes
Ethernet connection (via data logger): No
Warranty: 2 Years