Secure HRT4-B User And Installation Instructions Manual page 20

Now switch ON the electrical circuit to the HRT4-B and
observe that it switches the heating system On and Off
as the temperature is turned up and down on the
thermostat. If the thermostat is switching the heating
system satisfactorily then switch the electricity supply
to the thermostat OFF, remove the thermostat from the
wall plate and fit the terminal guard over the terminals
on the wall plate.
Once clipped into position the terminal guard
cannot be removed from the wall plate.
Re-fit the thermostat into position on the wall plate and
tighten the 2 captive screws on the underside of the
unit. Switch on the electricity supply to the HRT4-B and
check again for correct operation.
Explain its operation to the householder before handing
over these instructions, highlighting the 'explanation for
householders' section on page 4.
20