Data Sheet for Product

2/6
Smart Infrastructure Frost units QAF81... CA1N1284en
2021-08-31
Type summary
Typ reference Reset Capillary length
QAF81.3 automatic reset 3 m
QAF81.6 automatic reset 6 m
QAF81.6M with lock-out and manual reset 6 m
Name Typ reference
Capillary tube clamp (6 pieces) FK-TZ1
Ordering and delivery
When ordering, please give name and type reference, e.g. frost unit QAF81.6M.
The QAF81... frost unit is supplied complete with FK-TZ1 (capillary tube clamps).
If necessary a M20 cable gland for cable entry of the M20x1.5 type can be fitted to
achieve class IP65. This cable gland is not supplied with the delivery.
Technical design
The frost unit QAF81... trips when the temperature drops below the selected setpoint
over a capillary length of 30 - 100 cm.
An automatic reset occurs when the temperature rises above the setpoint again
(manual reset required with QAF81.6M).
The (R134a) gas-filled capillary and the diaphragm assembly together form the
measuring element, which is mechanically linked to the micro-switch. The temperature
is measured over the full length of the capillary.
1
0
1284D01
1
2
4
1
2
4
w
SD
T
Normal position
Frost alarm
Cold Warm
Legend.
SD Switching differential
T Air temperature
w Preselected setpoint
Mechanical design
The frost unit QAF81... has the following parts:
 Die-cast aluminium housing with removable cover
 Mechanical setpoint adjuster with scale in °Celsius and °Fahrenheit (setpoint
adjustment screw can be locked mechanically)
 Micro-switch for change-over contact
 Sensor unit with diaphragm assembly and copper capillary
 Capillary filled with R134a gas
 The QAF81.6M has a manual reset button
Accessories