Horstmann HRT4-B User Manual

The HRT4-B is a battery powered electronic room thermostat designed to provide
optimum comfort with close control of the energy used to heat the home.
The HRT4-B will only operate when 2 x AAA batteries have been fitted and the
thermostat is wired into your central heating system.
INSTALLATION AND CONNECTION OF THE HRT4-B MUST BE CARRIED OUT BY A
SUITABLY QUALIFIED PERSON.
WARNING: ISOLATE MAINS SUPPLY BEFORE COMMENCING INSTALLATION.
1
Battery Operated Electronic Room Thermostat
with TPI temperature control software
HRT4-B
User and Installation Instructions

Horstmann HRT4-B Specifications

Power

power supply	2 x AAA alkaline batteries
contact rating	3 (1)amp at 230v AC
rated impulse voltage	Cat 1 - 1500v

Operating Environment

temperature accuracy	+/- 0.5°C
temperature range	5-30°C
enclosure protection	IP30

Weight and Dimensions

dimensions	86mm x 86mm x 36.25mm

Summary

For the user

What is a room thermostat? ... an explanation for householders

Explains how a room thermostat works and provides tips for efficient use, including setting temperature levels.

Additional User information

Provides details on the HRT4-B's advanced control technology for improved accuracy and comfort.

User Instructions

Battery replacement

Step-by-step guide on how to replace the thermostat's AAA batteries, including low battery indicators.

Installation Instructions

Positioning the Room Thermostat

Guidelines for optimal placement of the thermostat on an internal wall, avoiding draughts and direct heat.

Fitting the wall plate

Instructions on how to remove and prepare the wall plate for mounting, ensuring proper clearance.

Electrical Connections

Steps for making electrical connections, including mains voltage applications and terminal guard fitting.

HRT4-B thermostat – internal wiring diagram

Typical combination boiler installation for boiler with built in timer and external room 'stat

Wiring diagram illustrating a typical setup for a combination boiler with an integrated timer and the HRT4-B room thermostat.

Typical combination boiler installation with ChannelPlus H11XL time switch and HRT4-B room thermostat

Wiring diagram showing a combination boiler connected with a ChannelPlus H11XL time switch and the HRT4-B thermostat.

Fully Pumped Heating System: 3 Port Valve Configuration

Fully Pumped Heating System: 2 Port Valve Configuration

Fitting the thermostat to the wall plate

Wiring conversion charts

Replacing existing Horstmann thermostats

Table showing wiring terminal mapping for replacing older Horstmann thermostats with the HRT4-B.

Replacing other thermostats

Table mapping wiring terminals for replacing thermostats from Drayton, Danfoss, and Honeywell with the HRT4-B.

DIL switch settings – TPI temperature control software

Switch positions for different TPI settings.

Explains DIL switch configurations for different TPI settings based on boiler type: Gas, Oil, Electric.

Thermostat specifications

Thermostat specifications

Lists technical details including power supply, contact rating, temperature accuracy, dimensions, and protection class.