Key Features

Benefits

• Supports freeze protection in water circuits based on temperature response.
• Can be installed in insulated external fittings where insulation is required.
• Helps maintain operation where heat pump pipework and fittings must be insulated.
• Provides clear installation parameters for trade use, including temperature and pressure ratings.

Technical Summary

ZERO28 28mm anti-freeze valve for water circuits. Max static inlet pressure 10 bar. Working temperature range 0 to 65°C. Ambient temperature range -30 to 60°C. Opens at 3°C and closes at 4°C. Sensitivity +/-1°C. Max discharge flow rate @ 3 bar: 1.5 L/H. Materials listed include stainless steel spring, UNI EN 12164 CW617N internal parts, EPDM PEROX internal seals, and UNI EN 12165 CW617N.

Installation Notes

If the valves are insulated, all external pipework and fittings must be fully insulated and sealed. The anti-vacuum valve must be kept clear at all times and inspected during annual service.

Efficiency

Building regulations Part L notes that external fittings on an air source heat pump system should be fully insulated to reduce heat loss and maintain system efficiency. The valve is stated to operate correctly when insulation is applied as specified.