Wiring for Vaillant Turbomax 828E and Wireless Thermostat

11 Nov 2016
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United Kingdom
Hi Guys

Bought new Tower RFNP wireless thermostat to replace old hard-wired one but have three wires coming from boiler and the thermostat receiver talks about needing 4 wires. What do I do?

This is what the thermostat instructions say...

For conventional heating installations, connections will be required to terminals 1-4 only. Terminal 5 can be ignored.

1: N Neutral
2: L Live
3: COM Switch input - common
4: NO Switch output (On) Normally open
5: NC Switch output (Off) Normally closed

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The wiring refers to the connections in the transmitter not the thermostat which has no connections and is powered by a battery

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