Safety group - for TV trays - 3/4" IVAR.G 501

Product detailed description

Domestic hot water systems in residential and commercial buildings require reliable safety and control components to manage thermal expansion and pressure fluctuations. Safety groups are essential in systems where thermal expansion occurs due to heating of stored water. These systems are commonly found in central heating installations with indirect water heating, where the TV tank is integrated into the heating circuit. Installers working on such systems must ensure correct sizing and positioning of safety groups to prevent overpressure and system failure.

Proper integration of a safety group ensures the system operates within safe parameters. The unit is typically installed on the cold water inlet to the TV tank, allowing for controlled expansion and pressure relief. This prevents damage to the tank and associated pipework. The installation must account for the thermal expansion volume generated during heating cycles, which is why additional components like expansion vessels may be required in some configurations.

Technical parameters

Material	Nickel-plated brass CW617N
Operating temperature	+120 °C
Nominal pressure	PN 7
Code	507053
Brand	IVAR

The operating temperature of +120°C is suitable for systems where the TV tank is heated via a boiler or heat pump. The nominal pressure rating of PN 7 determines the maximum allowable pressure in the system, which is important for selecting compatible piping and fittings. These parameters are critical for ensuring the safety group functions correctly under normal and peak load conditions.

Installation and connection

The safety group is connected to the TV tank via 3/4 inch threaded connections. Installers should ensure that the inlet and outlet ports are aligned correctly with the tank's plumbing. A key step is verifying that the pressure relief valve is oriented to allow safe discharge of excess pressure. Common installation errors include incorrect orientation of the check valve, which can lead to backflow and system inefficiency. It is also important to ensure that the unit is installed in a location accessible for inspection and maintenance.

Compatibility and accessories

This safety group is designed for use with TV tanks and is compatible with standard plumbing systems using 3/4 inch connections. For systems where thermal expansion is significant, an expansion vessel should be installed on the cold water supply line to accommodate the increased volume of water during heating. No additional accessories are included with the unit.

Technical background for designers

The safety group operates by combining three functions: pressure relief, isolation and backflow prevention. The nickel-plated brass construction (CW617N) provides corrosion resistance and mechanical strength, making it suitable for hot water applications. The unit is integrated into the TV tank's cold water inlet to manage pressure and flow. The service life and efficiency depend on the quality of installation, correct orientation of components and the presence of an expansion vessel where required.

Service and operation

Regular inspection of the safety group is recommended to ensure all components function correctly. Installers should check for signs of corrosion, leakage or blockage in the pressure relief valve. The ball valve should be tested for smooth operation, and the check valve should be verified for proper sealing. No specific service intervals are provided in the technical documentation.

Frequently asked questions

Can this safety group be used with a TV tank heated by a heat pump?
Yes, the operating temperature of +120°C is suitable for heat pump-heated TV tanks.

Is an expansion vessel required with this safety group?
It is recommended to install a small expansion vessel on the cold water inlet to manage thermal expansion in the TV tank.

Can this unit be installed in a vertical position?
Yes, provided the pressure relief valve is oriented to allow unobstructed discharge of excess pressure.

What is the maximum allowable pressure for this safety group?
The nominal pressure rating is PN 7, which defines the maximum pressure the unit can safely handle.