CONNECTING THE ST320RF RECEIVER
NOTE: All electrical installation work should be carried out by a suitably qualified Electrician or other
competent person. If you are not sure how to install this digital thermostat consult either with a qualified
electrician, heating engineer or your boiler / heating system supplier for advice on how to continue.
The ST320RF Receiver should be mounted in a suitable location that is both accessible for the connection
of mains and control wiring, and allows good reception of the RF signal. The Receiver needs a 230V AC
mains supply to operate, and this should be fused appropriately (16A max.). The Receiver should be
mounted in a location where it will not come into contact with water, moisture or condensation. Please
be reminded that touch can be held up by condensation on the touch ring surface and can reduce
sensitivity.
There are few electrical connections required to the ST320RF, and these connections should be made to
the terminal block inside the Receiver. No Earth connection is required for the correct and safe operation
of the ST320RF, but a parking terminal is provided to connect an Earth wire if one is present.
These electrical connections are shown in the table below:
ST320RF INSTRUCTION MANUAL6
Terminal Function
COM Common Contact (volt free input)
NO Normally Open Contact (volt free output)
Earth Parking (No electrical connection)
L Incoming Mains - Live
N Incoming Mains - Neutral
