Honeywell Home T4M Programmable Modulating Thermostat Installation Guide

: June 6, 2024
: Honeywell Home

Table of Contents

Quick Start Installation Guide
OpenTherm Data ID’s
Parameters
Troubleshooting
Documents / Resources
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)

Honeywell Home T4M 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…

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Must be installed by a competent person.
Toensure your safety make sure themains power is switched OFF before accessingwiring.

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32318058-001 B

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.

B) Connect wires according to wiring diagrams and clip the cover closed.

OpenTherm Boiler

| To prevent a short circuit from a loose wire –

When using multi-core cables: Only remove enough outer insulation to allow secure fixing ofthe coresinto the terminal block.
When using single core cables: Secure them together with a cable tie as close as possible to the terminal block.

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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.

Configure the System

Specific settings for the thermostat and heating system can be configured in the advanced menu.
Press and hold and then buttons together until the display changes (approx. 3 seconds).

A) Press and buttons tonavigate through the parameter list

B) Press and buttons to change a parameter

C) Press buttonto savethe change (or press ****to cancel the change)

D) Press button to exitadvanced menu and save any changes

OpenTherm Data ID’s

N °	Description	Settings (default in bold)
OT1	Low load control	0 = Off, 1 = On
OT2	Control setpoint	5 – 99°C
OT3	Supply water temperature	5 – 99°C
OT4	Returnwatertemperature	5 – 99°C
OT5	Max. supply water temperature	5 – 99°C
OT6	Hot water temperature	5 – 99°C
OT7	Hot water set point	5 – 99°C
OT8	Actual power	0 – 99%
OT9	Water pressure	0.0 – 9.9
OT10	OTC control	0 = Off, 1 = On
OT11	OTC curve	4 – 40 ( 16 )
OT12	Room compensation	0 = Off, 1 = On

Parameters

N°	Description	Settings (default in bold)
1 LA	Language	1 = EN, 2 = NL, 3 = DE, 4 = FR, 5 = ES
4 LL	Lower Temperature Limit	5 – 21 (°C)
5 UL	Upper Temperature Limit	21 – 35 (°C)
6 SO	Schedule options	1 = 7 day (different schedule each day of the week)

Troubleshooting

What’s happening?	What it could mean…	How to fix it…
Thermostat display is blank	No power to heating system	Check heating system

is powered
Faulty wiring connection| Check wiring at thermostat and boiler terminals
Display = | Faulty temperature sensor| Replace thermostat or check wiring to remote temperature sensor if fitted
Thermostat shows heat demand but boiler doesn’t respond| Boiler (water) already at temperature| Normal behaviour – wait for water temperature to drop
Faulty wiring connection| Check wiring at thermostat and boiler terminals

Conforms to protection requirements of the following directives:
EMC: 2014/30/EU and LVD: 2014/35/EU

ErP: Class VI (+4%), (EU) 811/2013

WEEE Directive 2012/19/EC – Waste Electrical and Electronic Equipment directive
At the end of the product life dispose of the packaging and product in a corresponding recycling centre. Do not dispose of the unit with the usual domestic refuse. Do not burn the product.

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Phone: +49 1801 466 388
info.de@resideo.com
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All rights reserved The Honeywell Home trademark is used under license from Honeywell International Inc. This product is manufactured by Resideo Technologies, Inc and its affiliates.