Timers & Programmers

The TS1-C timeswitch is a device that enables users to program up to 3 periods per day for automatic on and off functionality. To set up the timeswitch to turn on in the morning and turn off in the evening, the user needs to program the three periods with the desired on and off times. For example, P1 can be programmed to turn on at 6:30 am and turn off at 9:00 am, P2 can be programmed to turn on at 12:00 pm and turn off at 1:00 pm, and P3 can be programmed to turn on at 5:00 pm and turn off at 10:30 pm.

Once the desired on and off times have been programmed, the user can return the device to normal running mode and select the “Once” option by pressing the “Mode” button. With each press, the “Mode” button will cycle through available options until “ONCE” appears. Selecting the “ONCE” option will instruct the timer to only take note of the first “On” instruction and the last “Off” instruction, ignoring all other instructions. This allows the user to ensure that the device will turn on at the desired time in the morning and turn off at the desired time in the evening, regardless of any other programmed periods.

A thermostat or timer with ‘volt-free contacts’, or ‘volt-free switching’, operates a switch that opens and closes its contacts, but no voltage or current will flow. When a product has volt-free contacts, the installing electrician must ensure that the correct voltage (to be switched) is connected to the ‘common’ contact of the switch. This voltage, once connected to common, will then be fed to the circuit to be controlled, via the normally open contact. Wiring connected to the common contact must be suitably rated for the load current. The advantage of such an arrangement is that e.g. a mains-powered timer can switch a non-mains circuit, such as a low voltage alarm or lighting circuit.

The main reason a digital programmer will appear to reset or suffer program corruption is a surge/spike in the mains supply or from the load itself. If you suffer power cuts or see your lights dim or brighten, your power supply is fluctuating. If your programmer is connected to a control circuit via a contactor or relay you could be suffering from “Back EMF”.

Check that the override has not been set to “Fixed off” or the thermostat set too low.

Check that the override has not been set to “Fixed on”.

Valves and TRVs

The central heating synchronous valve motor is an important component in heating systems, used in both mid-position 3-Port valves and 2-port zone valves, to control the flow of hot water or heating fluid. Let’s explore its function in each valve type.

3-Port Mid Position Valves:

In a mid-position valve, the synchronous valve motor serves a crucial function in three different states:

Closed Heating Circuit (Default State): When there is no demand for heating or hot water, the synchronous valve motor keeps the valve in a closed position, ensuring that the heating circuit remains closed to conserve energy.

Mid-Position State: When there is a simultaneous demand for both heating and hot water, the synchronous valve motor moves the valve to the mid-position. This allows the flow of hot water or heating fluid to both the heating system and the hot water system simultaneously, enabling both functions to operate together effectively.

Heating Only State: When there is a demand for heating but not hot water, the synchronous valve motor moves the valve to a specific position that directs the flow of hot water or heating fluid to the heating system only. This ensures dedicated heating control without diverting hot water to unnecessary areas.

2-Port Zone Valves:

In a 2-port zone valve, the synchronous valve motor is utilized primarily to open the valve. The valve itself is equipped with a spring return mechanism that automatically closes the valve when the motor is not actively powered.

When a signal is received from the thermostat or central heating control system, the synchronous valve motor is activated to open the valve, allowing the flow of hot water or heating fluid to a specific zone or area of the heating system. This enables individual control and zoning of different heating zones.

Once the motor receives the signal and opens the valve, it remains powered to keep the valve in the open position. However, when the signal is no longer present, the synchronous valve motor is deactivated, and the spring return mechanism takes over. The spring returns the valve to its default closed position, shutting off the flow of hot water or heating fluid to the designated zone.

By utilizing the motor to open the valve and relying on the spring return to close it, the 2-port zone valve allows for efficient and reliable control of the heating system. The motor ensures precise opening of the valve to direct the flow, while the spring return mechanism provides a fail-safe mechanism for automatic closure when the motor is not actively powered.

To summarize, in a 2-port zone valve, the synchronous valve motor is responsible for opening the valve, allowing the flow of hot water or heating fluid to a specific zone. The valve incorporates a spring return mechanism to automatically close the valve when the motor is not actively powered, ensuring reliable operation and control of the heating system.

In both mid-position valves and 2-port zone valves, one of the conveniences is the ability to replace the valve motor without the need to drain the entire heating system. This feature offers several advantages:

Time and Effort Saving: When a valve motor needs replacement, not having to drain the entire system saves significant time and effort. Draining a heating system can be a time-consuming and complex task, requiring careful steps to avoid damage or airlocks. By eliminating the need for system draining, the process of replacing the valve motor becomes much simpler and quicker.

Cost-Effective Solution: Draining a heating system may require professional assistance, which can add to the overall cost. By removing the necessity of system drainage, the expense of hiring professionals or investing in specialized equipment for draining can be avoided, resulting in cost savings.

Minimized Disruption: Draining a heating system disrupts the functioning of the system, requiring it to be shut down temporarily. This can lead to discomfort and inconvenience, particularly during colder seasons when heating is essential. With the ability to replace the valve motor without draining the system, the disruption to the heating system’s operation is minimized, ensuring continued comfort for occupants.

Simplified Maintenance: The option to replace the valve motor without draining the system simplifies routine maintenance tasks. Whether in mid-position valves or 2-port zone valves, if motor replacement is required as part of regular servicing or troubleshooting, it can be easily done without interrupting the entire heating system’s functionality, making maintenance procedures more efficient.

Overall, the convenience of being able to replace the valve motor in both mid-position valves and 2-port zone valves without draining the heating system saves time, effort, and cost. It minimizes disruption to the system’s operation, allows for more efficient maintenance, and ensures uninterrupted heating comfort for occupants.

RPM explained:

When it comes to control and added torque, a lower rotational speed of 4 RPM (Rotations Per Minute) can often be preferred over higher speeds like 5 or 6 RPM. The slower speed allows for finer and more precise control over the movement of the mechanism or device. It provides a smoother operation and reduces the risk of overshooting or inaccurate positioning. Additionally, a lower RPM can offer increased torque, which is beneficial in applications that require higher rotational force or when dealing with heavier loads. The added torque ensures the motor has the necessary power to handle the required tasks effectively and reliably. Therefore, opting for 4 RPM can provide improved control and enhanced torque, resulting in better performance and accuracy in various applications.

The grey wire must be connected to the cylinder satisfied and then to the programmers “hot water off” terminal. This provides 230V AC to the grey wire when the hot water is satisfied or not in demand. Without the grey wire connected in this way, when calling for heating only the valve will open until it reaches the mid position. Power on the grey will allow it to travel fully and energize the boiler and pump.

Check the flow direction. There is an arrow on the body of the valve to show the correct orientation.

No, the valve will remain in that state until power is removed or hot water is called for. The synchronous motor is rated for running in a continuously stalled state.

The valve will feel hot to the touch, as the energy of the stalled motor is dissipated through the valve body. This is normal and the valve is designed to operate in this way.

To avoid this happening…. Set the Hot water to go into demand after the heating has switched off.

This is to ensure that should a leak occur that water does not come into contact with the internal electrical components.

Yes, join the white and grey wires together and supply them with 230V AC to spool the valve open. The default port that is closed is port “A”. When power is supplied to white and grey the valve will motor until port “B” has closed. Remove power and the valve will return to Port “A” being closed and port “B” open.



BS EN 215: BS EN 215 specifies the requirements for thermostatic radiator valves (TRVs) used in hot water central heating systems. It sets out the design, performance, and testing requirements for TRVs, including accuracy and reliability of temperature control, flow rates, and shut-off functions. Compliance with BS EN 215 ensures that TRVs are safe, reliable, and efficient, and can help to reduce energy consumption and costs.

CE Marking: The CE mark is a certification mark that indicates conformity with health, safety, and environmental protection standards for products sold within the European Economic Area (EEA). CE marking is applicable to a wide range of products, including toys, machinery, and medical devices. Manufacturers need to ensure that their products meet relevant EU directives and standards before affixing the CE mark.

EMC (Electromagnetic Compatibility Directive): The EMC Directive sets the standards for the electromagnetic compatibility of electrical and electronic equipment, including central heating controls. It ensures that such products do not interfere with other electrical equipment and do not suffer from interference themselves.

ErP (Energy-related Products Directive): The ErP sets the requirements for the energy efficiency of energy-related products, including central heating controls. It aims to promote the use of energy-efficient products and reduce energy consumption and greenhouse gas emissions.

LVD (Low Voltage Directive): The LVD is an EU directive that covers the safety requirements for electrical equipment designed for use within certain voltage limits. The directive applies to equipment with a voltage between 50 and 1,000 volts for alternating current and between 75 and 1,500 volts for direct current. LVD ensures that electrical products within its scope are safe to use and pose no risk to users.

RED (Radio Equipment Directive): The RED is an EU directive that sets the standards for the safety and electromagnetic compatibility of radio equipment. Manufacturers must ensure that their products meet the requirements of the RED before placing them on the market within the EU.

RoHS (Restriction of Hazardous Substances): RoHS is an EU directive that restricts the use of specific hazardous materials in the manufacturing of electrical and electronic equipment. It aims to protect human health and the environment by reducing the use of harmful substances, such as lead, mercury, and cadmium.

UKCA (UK Conformity Assessed): The UKCA mark is a certification mark used for goods placed on the market in Great Britain, replacing the CE mark after Brexit. It indicates that a product meets the relevant UK regulatory requirements. Manufacturers need to ensure their products comply with UK regulations before affixing the UKCA mark.

WEEE (Waste Electrical and Electronic Equipment): The WEEE Directive is an EU directive that aims to reduce the environmental impact of electrical and electronic waste. It sets collection, recycling, and recovery targets for electrical goods and requires producers to take responsibility for financing the treatment and disposal of their products.

WRAS (Water Regulations Advisory Scheme): WRAS is a UK-based certification that demonstrates compliance with water supply regulations and bylaws. Products with WRAS approval have been tested and proven not to cause waste, misuse, or contamination of the water supply. WRAS is particularly relevant for plumbing fittings, valves, and other water supply components.

Corgi Controls produces a range of specialized chemicals designed to optimize the performance of heating systems. These chemicals serve various functions, such as preventing corrosion & Leaks, improving efficiency, and addressing specific issues within heating systems.

It is essential for heating engineers and installers to be aware that boiler manufacturers regularly update the terms and conditions of their warranties. These updates may include guidelines on the use of third-party products, including chemicals and additives within heating systems.

To ensure compliance with warranty terms and to make informed decisions about the use of third-party products, we strongly recommend that engineers and installers:

1, Review Warranty Terms: Thoroughly examine the terms and conditions of the boiler manufacturer’s warranty. This is crucial to understand any restrictions or requirements related to the use of third-party chemicals or additives in heating systems.

2, Contact Boiler Manufacturer: For specific information regarding the use of third-party products and their impact on warranty coverage, contact the boiler manufacturer directly. They are the authoritative source for the most up-to-date warranty information and can provide guidance on using third-party products without voiding the warranty.

3, Compliance and Documentation: When using any chemicals or additives within heating systems, ensure compliance with both the manufacturer’s recommendations and industry best practices. Keep detailed records and documentation of any maintenance or modifications performed, including the use of third-party products.

Boiler manufacturers’ warranty terms may evolve over time, and their policies can vary between different models and product lines. Therefore, it is essential to engage directly with the manufacturer to obtain the most accurate and current information regarding warranty coverage when third-party products are involved.

Our commitment at Corgi Controls is to provide high-quality chemical solutions that enhance the performance and longevity of heating systems. However, we emphasize the importance of adhering to warranty terms set forth by boiler manufacturers to protect the interests of both engineers and end users.