Purchase now: Pfannenberg 17099315007 FLZ 520 Thermostat
Purchase now: Atlantech Drives provides you the Pfannenberg 17099315007 (Model: FLZ 520), the industry-standard NO (Normally Open) Thermostat specifically designed for the energy-efficient control of Filterfans and heat exchangers. While heaters use Red dials (NC), this unit features a Blue Dial to signify cooling control. It acts as a switch that closes the circuit only when the enclosure temperature rises above your setpoint, ensuring that your fans do not run unnecessarily when the machine is cool.
Technical Specifications and Hysteresis Logic
The FLZ 520 utilizes a precise bimetallic sensor element. The NO Contact logic means the circuit remains open (OFF) until the temperature exceeds the user-defined limit (e.g., 35°C). Once the fan cools the cabinet down by approximately 7 Kelvin (the hysteresis), the contact opens again. This «Cycle on Demand» strategy extends the lifespan of your fan filters by reducing the total volume of dirty air pulled through the system, and it doubles the life of the fan motor.
- Part Number: 17099315007.
- Model: FLZ 520.
- Contact Type: NO (Normally Open) – Closes on rise.
- Dial Color: Blue (Cooling).
- Setting Range: 0°C to +60°C.
- Switching Capacity: 240 V AC / 10 A.
- Mounting: 35mm DIN Rail (Snap-on).
- Protection: IP 20.
Expert Installation Advice: «Hot Spot» Targeting
Unlike heaters, which are placed at the bottom, the cooling thermostat should be placed where heat accumulates. Expert Tip: Install the FLZ 520 in the upper third of the cabinet, where the hot air rises. Ideally, place it near the air intake of the VFD or the most heat-sensitive component, but ensure it is not in the direct path of the cool air coming from the fan, as this would cause it to turn off too early (false reading).
Frequently Asked Questions (FAQs)
Q: Can I use this to trigger an alarm?
A: Yes! You can wire the FLZ 520 to a signal tower or beacon (like a Pfannenberg PA 1) to alert operators if the cabinet temperature exceeds a critical limit (e.g., 50°C).
Q: Does it require a power supply?
A: No, it is a mechanical passive switch. You simply route the live wire for the fan through the thermostat contacts.
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