The thermostat is used as any other one, but with the added facility of choosing the day or night temperature setting by means of a telephone. The remote control facility is operated via the telephone keypad, thus a DTMF type phone is required. From audio signals sent down the line, the user receives a report back on how the thermostat is set. Switching is protected by a security code, set by the user, which is keyed into the telephone in a simple manner.

Specifications
- separate settings for day and night temperature with LED indication
- relay output with LED indication: 5A / 240VAC (1200W)
- telephone pick-up after ± 3 or 8 rings
- report when the temperature has fallen below 3°C
- automatic hang-up if no code is received within 40 seconds
- possible security codes: from 000 to 999
- day temperature: from 14°C to 26°C (57°F to 79°F)
- night temperature setting: from 6°C to 18°C (43°F to 64°F)
- hysteresis (allowed temperature swing): 0.1°C
- local manual control
- supply voltage: 220VAC
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