Honeywell T4M Quick Start Installation Manual

T4M Thermostat
Programmable Modulating Thermostat
Quick Start Installation Guide
EN
Compatible with OpenTherm appliances only.
Not compatible with 230V boilers, zone valve
applications or 230V electric heating.
Installation in 3 steps...
Wire the
1
2
Thermostat
T
T
S
S
Must be installed by a competent person.
To ensure your safety make sure the mains power
is switched OFF before accessing wiring.
1
Wire the Thermostat
Find a suitable wall location away from draughts,
direct sunlight or other heat sources, and where cables
can be run from the boiler to the thermostat.
A) Separate the wallplate from
the thermostat, and using a
screwdriver open the wallplate
terminal cover to connect wires.
min 0.25mm²
max 1.5mm²
Power Up Configure
3
and Test the System
1.2-1.5m
B) Connect wires according
to wiring diagrams and
clip the cover closed.
A
B
C
T
T
T
T
S
S
max 6mm
OpenTherm Boiler
OpenTherm
Communication
To prevent a short circuit from a loose wire -
• When using multi-core cables: Only remove enough outer
• When using single core cables: Secure them together with
32318058-001 B
2
Power Up and Test
Power Up the Heating System and do a quick functional test
on the thermostat to check that it switches the boiler.
Thermostat
A
B
C
T
T
S
S
Polarity free
OT OT
OpenTherm
Boiler
insulation to allow secure fixing of the cores into the terminal block.
a cable tie as close as possible to the terminal block.
Press the
the temperature to maximum and
check the boiler switches on
– The heat demand icon
Now press the
the temperature to minimum and
check the boiler switches off
– The heat demand icon
button to increase
on the
thermostat should be on.
button to decrease
on the
thermostat should also go off.