Honeywell T4M User Manual

T4M Thermostat

Programmable Modulating Thermostat

OpenTherm Boiler

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...

Wire the

Thermostat

S S

Must be installed by a competent person.

To ensure your safety make sure the mains power

is switched OFF before accessing wiring.

Power Up

and Test

Configure

the System

OpenTherm

Communication

32318058001 B

Thermostat

A B C

T T S S

Polarity free

OT OT

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 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.

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.

max 6mm

1.2-1.5m

B) Connect wires according

to wiring diagrams and clip the cover closed.

A B C

T S

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.

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.

min 0.25mm² max 1.5mm²

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 to navigate

through the parameter list

C) Press

button to save the change

(or press to cancel the change)

B) Press

and buttons to

change a parameter

D) Press

button to exit advanced

menu and save any changes

Parameter

Number

Parameter

Setting

Parameters

10:BL

12:DS

13:TO 15:SD 16:FS

Description Settings (default in bold)

Language 1 = EN, 2 = NL, 3 = DE, 4 = FR, 5 = ES

1:LA

Lower Temperature Limit 5 - 21 (°C)

4:LL

Upper Temperature Limit 21 - 35 (°C)

5:UL

Schedule options 1 = 7 day (different schedule each day of the week)

6:SO

Number of periods per day 4 or 6

7:NP

Wired Remote Sensor 0 = No Remote Sensor, 1 = Wired Remote Sensor

8:SS

Fail Safe mode 0 = Boiler off, 1 = Boiler 20% on / 80% off

9:LC

Backlight 0 = Off, 1 = On (only on demand)

Clock Format 0 = 24 hr, 1 = AM/PM

11:CL

Daylight Saving time change 0 = Off, 1 = Auto

Temperature Display Offset +/1. 5°C

Restore Schedule Defaults 0, 1 = reset

Restore Factory Settings 0, 1 = reset

2 = 5 + 2 day (weekday + weekend schedule)

3 = 1 day (same schedule every day)

OpenTherm Data ID's

NoDescription Settings (default in bold)

Low load control 0 = Off, 1 = On

O T1

Control setpoint 5 - 99°C

OT2

Supply water temperature 5 - 99°C

OT3

Return water temperature 5 - 99°C

OT4

Max. supply water temperature 5 - 99°C

OT5

Hot water temperature 5 - 99°C

OT6

Hot water setpoint 5 - 99°C

OT7

Actual power 0 - 99%

OT8

Water pressure 0.0 - 9.9

OT9

OTC control 0 = Off, 1 = On

O T1 0

OTC curve 4 - 40 (16)

O T11

Room compensation 0 = Off, 1 = On

O T1 2

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.

Troubleshooting

What’s happening? What it could mean... How to fix it...

Thermostat display is blank

Display =

Thermostat shows heat demand but boiler doesn't respond

Honeywell Control Systems Ltd.

Skimped Hill Lane, Bracknell, Berkshire RG12 1EB

www.honeywelluk.com

No power to heating system

Faulty wiring connection Check wiring at thermostat

Faulty temperature sensor

Boiler (water) already at temperature

Faulty wiring connection Check wiring at thermostat

Manufactured for and on behalf of the Environmental & Energy Solutions Division of Honeywell Technologies Sàrl, ACSE&ES, Z.A., La Pièce 16, 1180 Rolle, Switzerland by its Authorised Representative Honeywell Inc.

Check heating system is powered

and boiler terminals

Replace thermostat or check wiring to remote temperature sensor if fitted

Normal behaviour - wait for water temperature to drop

and boiler terminals