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. 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 Honeywell CS92A is a temperature controller that is designed to provide precise and efficient control of heating systems. This controller is suitable for use in residential, commercial, and industrial applications. Regardless of other settings, at least one of the outlets is always open, so it is always possible for water to flow through the valve. The Honeywell Wireless thermostat gives you that extra bit of freedom. While each Honeywell Home thermostat is incredibly easy to use, you'll also get easy-to-follow installation instructions and a user manual, making the setup a breeze. 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 WiringThere 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*. 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. 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. If you see wires connected to terminals labeled G1 G2 G3, you need a thermostat capable of controlling multiple fan speeds; none of our retail thermostats are compatible with this system type. G is compatible, but not G1, G2, or G3. 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

Next, let’s talk about the C or common wire. If you have a Trane model thermostat and a wire labeled X or B, refer to your thermostat manual. In some cases, one of those wires is your common. If you have a C wire, place it into the C terminal on your wall plate. C wire adapters are available here. The same result is acheived if the hot water cylinder is fully heated - the cylinder thermostat provides the 'HW Off' signal by connecting C and 2 together. 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. To protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling. To confirm your system is off, change the temperature on your existing thermostat, so the system starts heating or cooling. If you don’t hear or feel the system turn on within 5 minutes, the power is off. You can skip this step if you have a digital thermostat with a blank display. 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.This scheme uses a 3 port mid position valve. In the past this was by far the most common setup, as it only requires one valve. 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 Comfort meets convenience with Honeywell Home thermostats. We know how important it is to keep our homes nice and warm, especially during the colder months, and that’s why here at Plumbworld, we offer a range of Honeywell Home Thermostats, offering a collection of analogue and digital programmable thermostats which will easily have your home temperature under control. Boasting advanced technology and modern features, the Honeywell thermostat does the clever stuff for you by managing the hot water flow from your boiler to your radiators or underfloor heating system. 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. As programmer terminal 1 has power, so does wiring centre terminal 7 which is connected to the valve grey wire. The white wire already has power via the room thermostat, and as power is applied to both grey and white, the valve moves to position A.

Having the right tools can make the wiring process much easier. Make sure to have a variety of screwdrivers (both flathead and Phillips), wire strippers, and electrical tape on hand. These tools will allow you to properly connect the wires and secure them in place. Your new thermostat may not be directly compatible if you see terminals labeled A B C, or 1 2 3, as your system requires a communicating thermostat. 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. 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. Locate any unconnected wire labeled W or W1. If you identified an O, B, or O/B wire connecting to the O/B terminal in the previous step and it has a separate W wire, place it into the W2 terminal. Connect the W wire to the W terminal if you don’t have a wire connected to the O/B terminal.

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As with hot water only, the orange valve wire is connected to power via the wiring centre terminal 8, but orange is still not connected to anything inside the valve. Operation - Heating only The Honeywell CS92A is known for its reliable and durable performance. It is constructed with high-quality materials, ensuring long-term reliability and resistance to wear and tear. The controller is also designed to be easy to use and install, making it suitable for both professional HVAC technicians and DIY enthusiasts. You should typically see an 18-gauge solid core wire. The most common configuration is five wires. However, you could see as few as two and many as ten. The CS92A also offers a range of programmable settings, allowing users to customize their heating schedules according to their specific needs and preferences. This flexibility in programming makes it suitable for a wide range of heating applications.

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 Older systems simply have the boiler and pump connected to SL (8 in the wiring centre), with only N and E permanently connected. With no power applied, the spring holds the valve in position B, so water only flows to the hot water cylinder. Power on White only Other wires are shown in pale grey. Some or all of these will be live depending on which modes are selected - these are highlighted brown in the other diagrams below. Due to several seconds being required for the valve to move from B to A, there is a delay between selecting heating at the programmer and the boiler starting. Possible problems

3 Port Valve Operation

As correct operation relies on the valve internals functioning properly, valve failure will result in some non-obvious situations. Heating only does not work 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