Wire the Thermostat

Honeywell T4M Programmable Modulating Thermostat - fig

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.

Honeywell T4M Programmable Modulating Thermostat - fig 1
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 BoilerHoneywell T4M Programmable Modulating Thermostat - 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.

Power Up and Test

Honeywell T4M Programmable Modulating Thermostat - Power

Power Up the Heating System and do a quick functional test on the thermostat to check that it switches the boiler.

Configure the SystemHoneywell T4R Wireless Programmable Thermostat - System

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

A) Press√ andfunction buttons to navigate through the parameter listB) Press+ and- buttons to change a parameter
C) Press√ the button to save the change (or pressfunction to cancel the change)D) Pressindoor use only. the button to exit the advanced menu and save any changes

OpenTherm Data ID’s

An OpenTherm boiler can report alerts back to the Thermostat.
You can view these in the ‘OpenTherm® boiler alerts’ menu.
The OpenTherm Data IDs appear after the installer parameters (see the table above).

Description Settings (default in bold)
Honeywell T4M Programmable Modulating Thermostat - iconLow load control0 = Off, 1 = On
Honeywell T4M Programmable Modulating Thermostat - icon 1Control setpoint5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 2Supply water temperature5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 3Return water temperature5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 4Max. supply water temperature5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 5Hot water temperature5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 6Hot water setpoint5 – 99°C
Honeywell T4M Programmable Modulating Thermostat - icon 7Actual power0 – 99%
Honeywell T4M Programmable Modulating Thermostat - icon 8Water pressure0.0 – 9.9
Honeywell T4M Programmable Modulating Thermostat - icon 9OTC control0 = Off, 1 = On
Honeywell T4M Programmable Modulating Thermostat - icon 10OTC curve4 – 40 (16)
Honeywell T4M Programmable Modulating Thermostat - icon 11Room compensation 0 = Off, 1 = On

Parameters

Description I- Settings (default in bold)
Honeywell T4R Wireless Programmable Thermostat - icon 4Language1= EN
Honeywell T4R Wireless Programmable Thermostat - icon 5Heating Cycle Rate (cps)3 (oil boiler / thermal actuator)
6 (gas or combi boiler / zone valve) 9 12
Honeywell T4R Wireless Programmable Thermostat - icon 6Minimum on time1- 5 (mins) (set to 4 mins for oil boiler)
Honeywell T4R Wireless Programmable Thermostat - icon 7Lower Temperature Limit5 – 21 (°C)
Honeywell T4R Wireless Programmable Thermostat - icon 8Upper-Temperature Limit21 – 35 (°C)
Honeywell T4R Wireless Programmable Thermostat - icon 9Schedule options1= 7 days (different schedule each day of the week)
2 = 5 + 2 day (weekday + weekend schedule)
3 = 1 day (same schedule every day)
Honeywell T4R Wireless Programmable Thermostat - icon 10Number of periods per day4 or 6
Honeywell T4R Wireless Programmable Thermostat - icon 11Fail Safe mode0 = Boiler off, 1 = Boiler 20% on / 80% off
Honeywell T4R Wireless Programmable Thermostat - icon 12Backlight0 = Off, 1 = On (only on demand)
Honeywell T4R Wireless Programmable Thermostat - icon 13Clock Format0 = 24 hr, 1 = AM/PM
Honeywell T4R Wireless Programmable Thermostat - icon 14Daylight Saving time change0 = Off, 1 = Auto
Honeywell T4R Wireless Programmable Thermostat - icon 15Temperature Display Offset+/-3°C
Honeywell T4R Wireless Programmable Thermostat - icon 16Restore Schedule Defaults0, 1 = reset
Honeywell T4R Wireless Programmable Thermostat - icon 17Restore Factory Settings0, 1 = reset
Honeywell T4R Wireless Programmable Thermostat - icon 18Optimisation0 = Disabled, 1= Enabled

Troubleshooting

What’s happening?What it could mean…How to fix it…
The thermostat display is blankFaulty wiring connectionCheck heating system is powered
Faulty wiring connectionCheck wiring at thermostat and boiler terminals
Display =Honeywell T4R Wireless Programmable Thermostat - icon 3Faulty temperature sensorReplace thermostat or check the wiring to remote temperature sensor if fitted
The thermostat shows heat demand but the boiler  doesn’t respondBoiler (water) already at temperatureNormal behavior – wait for water temperature to drop
Faulty wiring connectionFaulty wiring connection Check wiring at thermostat and boiler terminals
Honeywell T4R Wireless Programmable Thermostat - icon

Conforms to protection requirements of the following directives:
EMC: 2014/30/EU and LVD: 2014/35/EU
The full text of the EU declaration of conformity is available at the following internet address: https://hwllhome.co/DoC

Dustbin

ErP: Class V (+3%), (EU) 811/2013
WEEE Directive 2012/19/EU – Waste Electrical and Electronic Equipment directive
At the end of the product, life dispose of the packaging and product in a corresponding recycling center. Do not dispose of the unit with the usual domestic refuse. Do not burn the product.

Honeywell T4R Wireless Programmable Thermostat - logo 1

www,resideo.com
Pittway Sarl, Z.A. La Pièce 4,
1180 Rolle, Switzerland
Country of origin: UK

© 2020 Resideo Technologies, Inc. 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.

Documents / Resources

Honeywell T4M Programmable Modulating Thermostat [pdf] Installation Guide
T4M Programmable Modulating Thermostat, T4M, Programmable Modulating Thermostat

References

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