HONEYWELL THR842D Wireless Room Thermostat Installation Instructions

Contents hide

1 HONEYWELL THR842D Wireless Room Thermostat

2 Installation

2.1 Relay Box

3 Installation Notes

4 Installing the Relay Box

5 Basic System Operation

6 Installer Mode

7 Display

8 Parameters

9 Binding/Rebinding Procedure

10 REFERENCE

HONEYWELL THR842D Wireless Room Thermostat

Important notes

Paper Whiteness & Brightness levels of 90 (+/-5) should try to be achieved where possible. If not possible then notify Resideo of the closest alternative.
Printing and finishing should be to the best quality achievable by the process and free of blemishes, smudges or other visible defects.

Installation

The THR842D wireless room thermostat comprises a THR842D Room Thermostat and a Relay Box. These devices communicate on an 868MHz Radio Frequency (RF) band to control a single heating system component such as a boiler, pump or zone valve. RF communication is 2-way, allowing high performance energy efficient control, display of boiler information, and easy setup and communications check features.

Relay Box

Installation Notes

The RF link between the Room Thermostat (THR842D) and the Relay Box in Honeywell system packs is pre-configured at the factory and therefore should be installed at the same site.
If products from individual system packs are separated, or mixed with other pre-configured system packs during installation, or a faulty unit is being replaced, the desired units must be specially configured to allow them to communicate with each other.
This process is called Binding. Please refer to section 6) Binding / Rebinding Procedure.
THR842D or Relay box will not communicate with other RF products that use different frequencies or communications protocols.
The THR842D room thermostat requires no power source other than the batteries provided.
The Relay Box requires a permanent 230V~ supply.
The Relay Box should be installed before commencing the Room Thermostat installation.

Installing the Relay Box

For best performance, install in an open space. Leave at least 30cm distance from any metal objects including wall boxes and boiler housing.
Do not mount on metal wall boxes.
EMC compliance considerations
Keep AC mains supply/load cables separate from signal wiring.
Refer to Code of Practice standards EN61000-5-1 and -2 for guidance

Installing the THR842D Room Thermostat

Power up

RF Communication Test

Locating the Room Thermostat

For best performance, install in an open space where THR842D can sense the room temperature, and where the signal strength is high.
The Room Thermostat can be mounted on a wall or on the optional table stand.
Leave at least 30cm distance from any metal objects and at least 1 metre from any other electrical equipment.
Select the preferred location and test the Signal Strength before installation.

Signal Strength Test

Mounting the Room Thermostat

Test & Binding Flow-chart

Basic System Operation

Automatic Operation

Temporary Manual Override

Loss of RF communications

Installer Mode

To enter Installer Mode

To select a parameter

Display

To change a parameter

Parameter flowchart

Parameters

Description	Parameter	Range of values	Default Predefiniti
Minimum ON/OFF time /	Ot	1,2,3,4,5 m	1 m
Cycle rate / Frecuencia de los ciclos / Nombre de cycles/heure / Aantal schakelingen per uur / Zykluszeit / Frequenza dei cicli / Ciklusidő / Počet cyklů / Częstotliwość cykli / Počet cyklov / Velocidade de ciclo / Frecvență ciclu / Brzina ciklusa	Cr	{3,6,9,12}	6
Proportional band width	Pb	1.5 … 3.0 K	1.5K

Description	Parameter	Range of values	Default
Temperature measurement offset	tO	-3 … 3 K	0 K
Upper setpoint limit	uL	21 … 35 °C	35°C
Lower setpoint limit	LL	5 … 21 °C	5°C
ECO temperature	ES	5 … 35 °C	18 °C
Heat/cool changeover	HC	0 / 1	0
Heat/cool changeover	HC	0 = Disable
Off setpoint adjust	OS	— (= Off), 5…16°C	5°C
Failsafe mode (loss of RF communications)	LC	0 = Off 1 = On 20%	0 = Off
Reset parameters	FS	0 / 1	1 (factory)

Binding/Rebinding Procedure

The binding operation shown is required if:

any of the system components (Room Thermostat or Relay Box) are replaced
Relay Box has incorrect or no binding data stored (for example, when pre-bound system pack components have been mismatched