Fernox TF1 28mm Antifreeze Valve
The Fernox TF1 28mm Antifreeze Valve provides automatic frost protection for water-based air source heat pump systems. It helps protect vulnerable heat pump components and external pipework when water temperatures approach freezing conditions.
When the system fluid temperature reaches approximately 3°C, the valve automatically opens. It then releases system water to help prevent ice from forming inside the heat pump circuit. Once the fluid temperature reaches approximately 4°C, the valve closes automatically.
This 28mm version features convenient compression connections, making it ideal for heat pump installations using 28mm pipework. Fernox manufactures the valve from durable brass for reliable long-term operation.
Why Choose the Fernox TF1 Antifreeze Valve?
Automatic Frost Protection
The valve operates automatically when the system fluid approaches freezing conditions. No electrical supply or manual activation is required.
Opens at Approximately 3°C
When the circuit temperature reaches approximately 3°C, the valve opens and allows water to discharge. This action helps prevent ice from forming inside the system.
Automatically Closes at Approximately 4°C
As the system fluid temperature rises, the valve automatically closes at approximately 4°C.
Designed for Air Source Heat Pumps
Fernox developed the TF1 specifically to protect water-based heat pump heating systems against freezing conditions.
28mm Compression Connections
The 62664 model uses 28mm compression connections for straightforward installation into compatible heat pump pipework.
Durable Brass Construction
A robust brass body provides strength, durability and dependable long-term operation.
Key Features
- Genuine Fernox product
- Designed for water-based air source heat pumps
- Automatic frost protection
- Opens at approximately 3°C
- Closes at approximately 4°C
- 28mm compression connections
- Brass construction
- No electrical supply required
- Protects external heat pump pipework
- Helps prevent costly freeze damage
- Suitable for flow and return pipework
- Maximum static operating pressure of 10 bar
- Five-year Fernox warranty when used according to the manufacturer’s terms
Technical Specification
- Manufacturer: Fernox
- Product: TF1 Antifreeze Valve
- Product Code: 62664
- Connection: 28mm Compression
- System Fluid: Water
- Opening Temperature: +3°C
- Closing Temperature: +4°C
- Temperature Accuracy: ±1°C
- Maximum Static Operating Pressure: 10 bar
- Minimum Static Operating Pressure: 0.5 bar
- Operating Temperature Range: 0°C to 75°C
- Ambient Temperature Range: -30°C to +60°C
- Body Material: Brass Alloy
- Seals: EPDM
- Application: Water-based heat pump systems
- Warranty: 5 Years
How Does the Fernox TF1 Antifreeze Valve Work?
Air source heat pumps often have water-filled pipework and components installed outside the building. During very cold weather, this exposed water can become vulnerable to freezing.
The risk can increase if water stops circulating. A power cut or another system shutdown can leave stationary water exposed to low outdoor temperatures.
The Fernox TF1 Antifreeze Valve continuously responds to the temperature of the system fluid.
When that temperature reaches approximately 3°C, the valve automatically opens and discharges water. This action helps prevent ice from forming and damaging the heat pump or connecting pipework.
Once the water temperature rises to approximately 4°C, the valve automatically closes.
Why Do Air Source Heat Pumps Need Frost Protection?
Water expands when it freezes. If water freezes inside a heat pump or its connecting pipework, this expansion can damage vulnerable components.
Potential consequences include:
- Damaged external pipework
- Heat pump component damage
- System breakdown
- Loss of heating
- Unplanned repairs
- Costly replacement components
- Extended system downtime
The Fernox TF1 Antifreeze Valve provides a simple mechanical method of reducing this risk on suitable water-based heat pump systems.
Ideal for Systems Without Glycol
Fernox specifically identifies the freezing risk for heat pump systems that do not use a glycol-based heat transfer fluid.
The TF1 Antifreeze Valve provides protection by automatically discharging water as the system fluid approaches freezing temperatures.
This makes the valve an important consideration when designing suitable frost protection for water-based air source heat pump installations.
Installation Requirements
Correct positioning is essential for reliable operation.
Fernox requires the TF1 Antifreeze Valve to sit horizontally with its outlet facing downwards. This position allows discharged water to drain freely.
Install the valve outdoors in the coldest section of the system. Keep it away from heat sources that could affect its operation.
Fernox recommends fitting an antifreeze valve to both the flow and return pipework.
The installation should also:
- Keep the valve at least 10cm above ground level.
- Maintain at least 10cm between multiple valves.
- Route discharged water to a suitable collection tray or pipe.
- Avoid pipe arrangements that could create a trap.
- Keep the system under pressure during valve drainage where possible.
- Follow the full Fernox installation instructions.
Protecting the Valve Outdoors
Fernox recommends insulating the TF1 Antifreeze Valve with an appropriately sized thermal cover.
Insulation should cover only the valve body. Do not cover the vacuum breaker.
Externally installed valves should also receive suitable protection from rain, snow and direct sunlight.
Ideal Applications
The Fernox TF1 28mm Antifreeze Valve is suitable for:
- Air source heat pump systems
- Water-based heat pump systems
- Domestic heat pump installations
- Commercial heat pump installations
- 28mm heat pump pipework
- Heat pump flow pipes
- Heat pump return pipes
- Renewable heating systems
- Monobloc heat pump installations where compatible
- New heat pump installations
- Heat pump system upgrades
Heat Pump Protection Without Electricity
The TF1 Antifreeze Valve operates mechanically according to the temperature of the system fluid.
It does not rely on the heat pump controller or an electrical power supply to activate. This characteristic makes frost protection particularly useful during circumstances such as a power outage.
If circulation stops and the system water reaches the valve’s operating temperature, the TF1 can automatically discharge water to reduce the risk of freezing.
Complete Your Heat Pump Installation
Heat Pump Pipe
Connect your air source heat pump with suitable heating pipework designed for reliable long-term performance.
Pre-Insulated Pipe
Reduce heat loss between the outdoor heat pump and the property with insulated flow and return pipework.
Isolation Valves
Add accessible isolation points to simplify future servicing and maintenance.
Fernox Heat Pump Chemicals
Protect and maintain renewable heating systems with specialist Fernox cleaners, inhibitors and heat transfer fluids.
Fernox Heat Pump Filters
Capture circulating debris and contaminants before they can affect sensitive heat pump components.
Underfloor Heating Manifolds
Distribute low-temperature heating water across individual underfloor heating circuits.
Underfloor Heating Pipe
Complete low-temperature heating installations with PE-RT, PE-RT-AL-PE-RT and PEX-AL-PEX pipe.
Why Buy the Fernox TF1 28mm Antifreeze Valve from Kudos Trading?
Kudos Trading supplies professional plumbing, heating and renewable-energy components for installers and homeowners throughout the UK.
Our range includes products for complete heat pump and low-temperature heating installations.
When you order from Kudos Trading, you’ll benefit from:
- Genuine Fernox products
- Competitive UK prices
- Fast nationwide delivery
- Expert technical support
- Extensive product availability
- Friendly customer service
- Over 25 years of industry experience
Frequently Asked Questions
What does the Fernox TF1 Antifreeze Valve do?
It helps protect water-based heat pump systems against freezing. The valve automatically releases system water when the fluid temperature approaches freezing conditions.
At what temperature does the Fernox antifreeze valve open?
The TF1 Antifreeze Valve opens when the system fluid reaches approximately 3°C.
At what temperature does the valve close?
The valve closes when the fluid temperature reaches approximately 4°C.
Is this the 28mm Fernox antifreeze valve?
Yes. Product code 62664 features 28mm compression connections.
Is the TF1 Antifreeze Valve designed for air source heat pumps?
Yes. Fernox specifically designed the TF1 to protect water-based air source heat pump heating systems.
Does the valve need electricity?
No. The TF1 operates automatically in response to the temperature of the system fluid.
Should I install a valve on both heat pump pipes?
Fernox recommends installing a TF1 Antifreeze Valve on both the flow and return pipes.
Can the Fernox antifreeze valve be installed vertically?
No. Fernox requires installation in a horizontal position with the outlet facing downwards. This allows discharged water to drain correctly.
Where should the valve be installed?
Install it outdoors in an area where the lowest system temperatures can occur. Keep the valve away from heat sources that could interfere with its operation.
What is the maximum operating pressure?
The maximum static operating pressure is 10 bar. The minimum static operating pressure is 0.5 bar.
What is the operating temperature range?
The specified system-fluid operating range is 0°C to 75°C.
What ambient temperatures can the valve withstand?
Fernox specifies an ambient operating range from -30°C to +60°C.
Does the Fernox TF1 Antifreeze Valve have a warranty?
Yes. Fernox provides a five-year warranty, subject to correct use and the manufacturer’s warranty terms.
Related Products
- Fernox Heat Pump Chemicals
- Fernox Heat Pump Filters
- Air Source Heat Pump Accessories
- Pre-Insulated Heat Pump Pipe
- Heating Isolation Valves
- Underfloor Heating Manifolds
- Underfloor Heating Pipe
- Heat Pump Installation Accessories
- Water Underfloor Heating Controls
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