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Siemens Building Technologies CA1N1284E / 11.1998
Landis & Staefa Division 3/4
The capillary must be mounted on the downstream side of the heating coil (and on the
upstream side in the case of coiling coils). It should be looped diagonally across the
heat exchanger pipes at a distance of approximately 5 cm, and should cover the entire
area evenly. For test purposes, it is advisable to leave a loop of approximately 20 cm
directly beneath the housing outside the entry to the duct.
To prevent damage to the capillary it should be protected by grommets or similar where
it passes through metal walls. The capillary has a minimum bending radius of > 20 mm.
Tighter bends must be avoided. Use capillary supports FK-TZ1!
50346
After removal of the locking screw (under the housing cover) the setpoint can be
adjusted from above with a screwdriver.
To simulate frost conditions, the test loop can be immersed in a vessel of iced water.
A frost alarm can also be initiated by short-circuiting terminals 1 and 2.
To simulate frost with the QAF81.6M, pull out the reset button (on the housing base).
The frost thermostat is maintenance-free.
Correct operation of the device can be checked by immersing the test loop in a vessel
of iced water.
Setpoint adjustment range X
K
5 ... 15 °C (23 ... 59 °F)
Factory setting 5 °C (41 °F)
Switching differential 2 °C ±1 °C (3.6 °F ±1.8 °F)
Repeatability ± 0.5 °C (± 0.9 °F)
Responsive length of sensor Approx. 0.3 m
Type of switch Single pole change-over
Contact rating AC 250 V, 10(2)A
Reset mechanism: QAF81.3 , QAF81.6 Automatic
QAF81.6M Manual
Admissible medium Air
Orientation Any
Materials:
Housing Die-cast aluminium
Bellows housing Copper
Capillary Copper
Capillary contents Freon R134a
Electrical connection 3 screw terminals, 1.5 mm
2
Cable entry Threaded PG 13.5
Protection class I (to IEC730-1)
Protection standard IP65 to IEC529
Ambient temperature:
Max. operating temperature 70 °C (158 °F)
Min. operating temperature X
K
+ min. 2 °C (+ min. 3.6 °F)
Storage 30 ... 70 °C (22 ...158 °F)
Destruction limit 140 °C (284 °F)
Weight (including packaging) 0.9 kg
Maintenance None required
Conformity Meets the requirements for CE marking
Capillary
Commissioning
notes
Frost simulation
Maintenance notes
Technical data
3


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