Caleffi iStop DN25 (1") frost protection valve, operating temperature up to 90 °C

• To prevent frost damage to outdoor units of monoblock heat pumps
• If there is a risk of frost due to a power outage, defective circulation pump or similar, it releases the heating water.
• Outdoor installation required in the flow and return lines
• Installation in vertical pipelines
• Opens at a medium temperature of +3°C, closes at a medium temperature of +4°C

Technical data:

• Ambient air temperature: 30°C to 60°C
• Media: Water, water/glycol mixture up to 30%
• Housing material: Brass
• Drainage capacity:
• 0.5 l/h (at 5°C and 3 bar)
• 1 l/h (at 20°C and 3 bar)

• For heating operation up to 90°C
• Without ambient air sensor
• Operating pressure: max. 10 bar
• Operating temperature range: 0°C to 90°C