Identify any wires labeled R, RH, or RC. You typically have one or two of those three. If you have one wire — even if it’s labeled RC — it goes into the R terminal, setting the jumper connecting terminals R and RC in place. Thermostats may have a jumper switch, metal staple, or plug. The jumper may also be a wire connecting the two terminals. If you have two wires, R or RH go into the R terminal and RC into the RC terminal. If you have more than one wire (for example, you have a wire labeled R and another wire labeled Rc), remove any jumpers between the R and Rc terminals or push the switch to open the RC terminal to insert a wire. Here, power is also applied to programmer terminal 4, which connects via wiring centre terminal 4 to the room thermostat. If heat is required, power continues to terminal 5 in the wiring centre, and therefore to the white valve wire. This video covers the wiring and electrical operation of a Y plan system. Wiring diagrams and further information continues below. View on Youtube. System Wiring

There is no standard for which color wire controls each function. When wiring, each wire should be identified by what terminal(s) it connects to — never by color. If you don’t know to which terminal each wire connects, it may be necessary to go to the HVAC system and look at the designations on the control board. Consult your owners/install guide for wiring examples and systems compatible with your thermostat*. Honeywell Cylinder Stat Wiring: When it comes to wiring a Honeywell cylinder stat, it’s important to understand the different components and how they work together. The cylinder stat is responsible for controlling the temperature of the hot water in your cylinder, ensuring it stays at a comfortable level. In this guide, we will walk you through the wiring process step by step, providing clear instructions and helpful tips along the way. Whether you’re a seasoned DIY enthusiast or a complete beginner, this guide will give you the confidence and knowledge to successfully wire your Honeywell Cylinder Stat and enjoy the benefits of a reliable and efficient home heating system. Understanding Honeywell Cylinder Stat Wiring When wiring your Honeywell Cylinder Stat, there are a few key considerations to keep in mind. It’s crucial to correctly identify the terminals and understand their functions. This will ensure that you connect the correct wires and avoid any potential damage or malfunctions.This diagram shows the wiring layout using the most typical components. Here, coloured wires indicate the permanent mains supply to the boiler and programmer. The three additional coloured valve wires are also shown (white, grey and orange). This results in a noticeable delay when switching on heating only, as the motor has to move the valve from B to A. This takes several seconds. Overview Video This causes the valve motor to move to the mid position, and water from the boiler flows to both the hot water cylinder and the radiators.

The components: The main components of a Honeywell cylinder stat wiring are the cylinder stat itself, the wiring center, and the boiler. The cylinder stat is usually located near the cylinder, and it monitors the temperature of the hot water. The wiring center is where all the wiring connections are made, and it acts as a central hub for the system. The boiler is responsible for heating the water. If your O or B terminal shares a label with another wire — typically W —identify whether you have a heat pump system or not. A heat pump runs your compressor for both heating and cooling. If you don’t know your system type, place this wire in the W terminal. If you have a heat pump system, put it in the O/B terminal.

Operation - Heating only

If the valve motor fails, the valve will remain at position B and hot water will never reach the radiators. Radiators and hot water always work together Before getting started, it’s important to familiarize yourself with the wiring diagram provided by Honeywell. This diagram will show you the necessary connections and the color codes for the wires. Make sure to follow the diagram carefully to avoid any mistakes. Firstly, it’s important to understand the basic principles of cylinder stat wiring. The cylinder stat is responsible for monitoring and controlling the temperature of your hot water cylinder. It works in conjunction with your central heating system to maintain a constant and comfortable temperature throughout your home.

These diagrams show a modern boiler where the boiler requires mains power all the time, with a separate wire used to activate the boiler and the pump connected directly to the boiler. If you’re looking to upgrade your home heating system, the Honeywell Cylinder Stat is a reliable and efficient choice. This guide will provide you with all the information you need to properly wire your Honeywell Cylinder Stat, ensuring optimal performance and energy savings.Referring to your photo, remove and label each wire. If a terminal has multiple designations like W and O/B, it will be labeled as W and O/B and not just one or the other. Older systems simply have the boiler and pump connected to SL (8 in the wiring centre), with only N and E permanently connected. On most valves, the actuator head containing the switches and motor can be replaced as a separate unit without draining the system. On some, the internal motor can be replaced, although it is often easier to change the whole head. The room thermostat is shown with a neutral connection. However a 2 wire thermostat can be used which does not require a neutral. Operation - Hot water only

The valve is not powered at all, and the spring holds it in position B, so water from the boiler only flows to the hot water cylinder. With no power applied, the spring holds the valve in position B, so water only flows to the hot water cylinder. Power on White onlyPower starts at terminal 3 (HW On) in the programmer. This passes via the wiring centre terminal 6 to the cylinder thermostat. If heat is required, power continues to terminal 8 in the wiring centre, and on to the boiler and pump. If the switch in the valve fails, the orange wire will never be connected to power. This results in heating only not working at all, yet the system works fine with water only or heating and water. Radiators never heat up, regardless of other settings.