Honeywell T4M User Manual

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

Honeywell T4M Specifications

General

Wi-Fi Connectivity	Yes
Battery Backup	Yes
Programmability	7-day programmable
Hold Feature	Yes
Filter Change Alert	Yes
Warranty	1-Year Limited Warranty
Mobile App	Honeywell Home App
Power Source	Battery
Voltage	24VAC
Temperature Range	40°F to 90°F
Type	Programmable Thermostat
Voice Control	Yes (Amazon Alexa, Google Assistant)
Stages	1H/1C or 2H/2C

Summary

Wire the Thermostat

Wallplate Separation and Terminal Access

Detailed steps for separating the wallplate and accessing the terminal cover for wiring connections.

Connecting Thermostat Wires

Instructions on connecting wires to the thermostat terminal block according to wiring diagrams.

Safety: Prevent Short Circuits

Essential safety advice to prevent short circuits by proper insulation and cable management.

Power Up and Test Thermostat

Boiler Activation Test

Test to confirm the boiler switches on when the thermostat demands heat.

Boiler Deactivation Test

Test to confirm the boiler switches off when the thermostat's heat demand is removed.

Configure the System

Entering Advanced Configuration Menu

Procedure to access the thermostat's advanced menu by pressing specific buttons.

Navigating and Adjusting Parameters

Instructions for navigating through system parameters and changing their values.

Saving Configuration Settings

Method to save any changes made in the advanced menu or to exit without saving.