To ensure your safety, always make sure mains power is switched OFF before accessing wiring.
Before removing the old thermostat take a picture of the old thermostat's wiring as a reference then proceed to installation.
The T4 thermostat should not be placed near draughts, in direct sunlight or near heat sources. It should be at least 1.2 - 1.5
meters from the floor.
Prepare Receiver Box (T4R only)
Needed during installation:
Cable with 2 wires from boiler to Receiver Box (R4H910RF1004).
The Receiver Box requires 230V power.
Find a suitable location near the boiler. Leave at least 30cm distance from any
metal objects including wall boxes and boiler housing.
Loosen the front screw to remove cover or tighten it when the cover is back in
Install Receiver Box (T4R only)
A. Wall box or Rear wiring
Hinge open the terminal block flap
to access the cables and wall box
Turn mains powers ON to the heating application and the receiver box
After powering up both
devices the status LED
should be steady GREEN
T4 PROGRAMMABLE THERMOSTAT
B. Surface wiring
Hinge open the terminal block flap to
access the cables and wall box screw
C. Replace cover
Locate the hinges at the top of the
cover and wall plate, close the cover
and secure with the screw.
Press the manual override
to check if the boiler switches ON.
The button LED lights should light