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QAF81.6
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Specification & Description
| Specification | Description |
|---|---|
| Part Number | QAF81.6 |
| Manufacturer | Siemens |
| Part Type | Frost Monitor |
| Application | Air temperature monitoring for HVAC systems to prevent frost damage |
| Housing Material | Aluminium alloy |
| Sensing Length | Approximately 30 - 100 cm |
| Switching Hysteresis | 2 ±1 °C (3.6 ±1.8 °F) |
| Repeatability | ±0.5 °C (±0.9 °F) |
| Setpoint Range | -5...+15 °C (23...59 °F) |
| Factory Setting | 5 °C (41 °F) |
| Capillary Length | 6 m |
| Switch Type | Single-pole changeover contacts |
| Contact Rating | AC 250 V / 15 (1.2) A, DC 30 V / 15 (1.5) A |
| Reset Mechanism | Automatic |
| External Fuse | Slow-blow fuse max. 10 A or circuit breaker max. 13 A (characteristic B, C, D) |
| Allowed Medium | Air |
| Mounting Position | Any |
| Electrical Connection | Screw terminals for 1.5 mm² cable |
| Cable Entry | Threaded entry M20 x 1.5 |
| Protection Class | I according to EN 60730-1 |
| Enclosure Protection | IP54 (IP65 with optional cable gland) |
| Standards | EN 60730-1 |
| Operating Temperature | Max. 70 °C (158 °F), Min. w + min. 2 °C (min. 3.6 °F) |
| Storage Temperature | -30...+70 °C (-22...+158 °F) |
| Destruction Limit | 140 °C (284 °F) |
| Weight | 0.9 kg (including packaging) |
| Maintenance | Maintenance-free |
The Siemens QAF81.6 Frost Monitor is a robust and reliable solution designed to safeguard air handling units and ventilation systems from frost damage. Housed in a durable aluminium alloy casing, this frost monitor is engineered to detect temperature drops along its 6-metre capillary tube, ensuring comprehensive monitoring across the entire length.
With an adjustable setpoint range of -5 to +15°C, the QAF81.6 offers precise control and high reproducibility, making it ideal for various HVAC applications. The device features a small switching hysteresis and automatic reset functionality, ensuring seamless operation and minimal maintenance.
The QAF81.6 is equipped with a single-pole changeover contact switch, capable of handling AC 250V/15A and DC 30V/15A, providing versatile integration options. Its IP54 protection rating, which can be enhanced to IP65 with an optional cable gland, ensures reliable performance in demanding environments.
Designed for easy installation, the frost monitor includes screw terminals for secure electrical connections and can be mounted in any position. The QAF81.6 is an essential component for maintaining the efficiency and longevity of your HVAC systems, preventing costly frost-related damages.
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Frequently Asked Questions
What is the primary function of this part?
The Siemens QAF81.6 is a frost monitor designed to prevent frost damage in HVAC systems by monitoring air temperature.
What is the temperature range for this frost monitor?
The temperature range for the Siemens QAF81.6 is -5 to +15 °C (23 to 59 °F).
How does the frost monitor reset?
The Siemens QAF81.6 features an automatic reset mechanism.
What type of environments is this frost monitor suitable for?
The Siemens QAF81.6 is suitable for residential, commercial, light-industrial, and industrial environments.
What is the protection class of this frost monitor?
The Siemens QAF81.6 has a protection class of IP54, and it can be upgraded to IP65 with an additional cable gland.
What is the length of the capillary tube for this frost monitor?
The Siemens QAF81.6 comes with a 6-meter capillary tube.
What is the switching hysteresis of this frost monitor?
The switching hysteresis of the Siemens QAF81.6 is 2 ±1 °C (3.6 ±1.8 °F).
What materials are used in the construction of this frost monitor?
The Siemens QAF81.6 is constructed with an aluminium alloy housing, a copper membrane, and a copper capillary filled with Freon R134a.
What are the typical applications for this frost monitor?
Typical applications for the Siemens QAF81.6 include monitoring air temperature in HVAC systems to prevent frost damage to heat exchangers.
Does this frost monitor require maintenance?
The Siemens QAF81.6 is maintenance-free.
