Technische Alternative ESR 21 Series User Manual

Technische Alternative ESR 21 Series

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ESR 21

Version / Versione / Versión 7.9

Simple solar control unit

Régulateur solaire simple

Regolatore semplice a energia solare

Regulación solar sencilla

Table of Contents

Questions and Answers:

A
Andrew JamesAug 3, 2025
Why is my Technische Alternative ESR 21 displaying incorrect temperatures?
- D
  Darrell CummingsAug 3, 2025
  If your Technische Alternative Control Unit shows values like -999 (sensor short-circuit) or 999 (interruption), it doesn't automatically indicate a hardware issue. Ensure the correct sensor types (KTY or PT1000) are selected in the menu under SENSOR, as the default setting is PT (1000). To check the sensor, replace the potentially faulty sensor with a known working one on the terminal strip to verify the display.
A
agarciaAug 12, 2025
What to do if my Technische Alternative ESR 21 Control Unit system is not in operation?
- S
  Stanley FisherAug 13, 2025
  If your Technische Alternative Control Unit isn't working despite having power, check the 3.15A quick-blowing fuse that protects the control system and the output. Replace the fuse if necessary.

Technische Alternative ESR 21 Series Specifications

General

Housing Material	Plastic
Connection Type	Screw terminals
Number of Relays	4
Number of Analog Inputs	4
Inputs	Digital, Analog
Outputs	Relay
Display	LCD
Humidity	non-condensing
Relay Contact Rating	230 V AC
Analog Input Type	0-10 V, 0-20 mA

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