Radio Telemeter Series 2a Manual __link__ — Horstmann

A significant portion of the is dedicated to troubleshooting. If your heating isn't working as expected, consult these common issues before calling a technician.

(often labeled with a small number at the side) represent your separate day and night usage.

For most people, the name Horstmann evokes nothing. For radio amateurs, vintage industrial control enthusiasts, and Cold War–era infrastructure historians, however, the Series 2A manual is a Rosetta Stone—a key to understanding how remote monitoring quietly became a reality before the internet.

Typically displays total consumption for nighttime/off-peak electricity. horstmann radio telemeter series 2a manual

Never connect outputs 1 or 2 to neutral. This will destroy the internal switching relay. Always use a suitable contactor if switching loads >3A resistive.

Before diving into the technicalities of the manual, it is important to understand what this device does. The Series 2A is a wireless programmable thermostat system. It consists of two distinct components:

Before diving into the manual details, it is essential to understand what the Series 2A actually is. The Radio Telemeter was designed as a . In the UK electricity grid, utilities use a centralized radio signal (controlled by the Radio Teleswitch Service or RTS) to manage peak demand. The Series 2A listens for these signals to switch between "Peak" and "Off-Peak" (Economy 7 or Economy 10) tariff rates. A significant portion of the is dedicated to troubleshooting

Modern restorers have digitized the manual, added errata, and colorized the fold‑out schematics. But they speak of the original with reverence. “It’s not just a manual,” one collector told me. “It’s a conversation with the engineer who designed it. You can feel them thinking through the problem alongside you.”

Ignore the red button; it is generally not used for standard consumer operation. Visual Indicators

And somewhere, on a damp hilltop, one of those units is still ticking. Its antenna sways. Its relay clicks. And somewhere nearby, a well‑thumbed copy of the manual lies open to page 17. For most people, the name Horstmann evokes nothing

: It receives signals transmitted on the supply frequency to automatically switch heavy equipment to off-peak rates.

This guide is for informational purposes. Always isolate the mains supply before working on electrical equipment. If you are unsure, consult a qualified electrician or heating engineer.