s Frost detectors QAF63.2-J QAF63.6-J for use on the air side Active capillary tube sensor for acquiring the lowest temperature within a range of 0…15 °C Operating voltage AC 24 V Signal output DC 0...
Use 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, air dampers closed or other actions need to be taken by the control system to prevent freeze-ups Functions Technical design With the help of a vapor-filled capillary tube and diaphragm, the QAF63..
Type summary Product number QAF63.2-J QAF63.6-J Ordering Order number S55700-P153 S55700-P154 Description Frost unit with 2-m capillary Frost unit with 6-m capillary When ordering, please give product number, order number and description. The mounting accessories not included in the scope of delivery must be ordered as separate items. Accessories Included in the scope of delivery 1x 2x 1x Not included in the scope of delivery Product number M16 cable gland for cable entry screw to DIN 7981-St 4.
Notes Engineering The frost detector operates on AC 24 V. The transformer used must be suitable for safety extra low voltage (SELV), 100% duty, and must have separate windings. Fuses, switches, wiring and earthing must be in compliance with local safety regulations. The permissible cable lengths must be observed. If the capillary tube is mechanically damaged or if there is a leak in the diaphragm system, the frost detector signals a temperature of 0 °C.
Technical data Power supply Line lengths for measure signal terminals B M Functional data Degree of protection Electrical connections Environmental conditions Operating voltage Frequency Power consumption At ambient temperatures >10 °C (with no heating) External supply line protection Perm. cable length Copper cable 1.5 mm2 Measuring range Time constant: In still air In moving air Output signal, linear (terminal B) Capillary tube Min. active length Perm.
Diagrams 1821G01 Internal diagram G B G M B M System voltage (SELV) AC 24 V System neutral, measuring neutral Signal output DC 0...11.5 V 0...15 °C Note: If terminal "B" of the QAF… is connected to a controller, signal >10 V might drop out (e.g. 11 V) which, with certain types of controllers, can lead to a fault status message. Remedy: Fit a Zener diode to terminal "B" of the QAF.. or to the controller’s input to ensure that the DC 0…10 V signal will not exceed 10 V.
Dimensions (Dimensions in mm) 7/8 Siemens Frost detectors A6V10432020_en--_c 2019-04-29
Published by: Siemens Switzerland Ltd. Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Switzerland Tel. +41 58-724 24 24 www.siemens.
