QAF64.2-J - Siemens frost detector, modulating and 2-point, capillary tube 2000 mm

The Frost detector QAF64.2-J QAF64.6-J are for air use.

• With active capillary tube sensing element for acquiring the lowest temperature within a range of 0…15 °C
• With startup function
• Operating voltage AC 24 V
• Signal voltage DC 0...10 V

On the air side of ventilation and air conditioning plants:

• Typically: hot water air heating coils where there is a risk of freezing due to cold incoming outside air
• Where fans are to be switched off, heating valves opened and air dampers closed to prevent freeze-ups
• Where risk of frost shall be signaled