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CA1N1284E / 11.1998 Siemens Building Technologies
2/4 Landis & Staefa Division
The frost thermostat QAF81... and, if required, FK-TZ1 capillary supports, must be
ordered separately (1 set of 6 is supplied).
When placing an order, please specify the quantity, product description and type code.
Example:
1 frost thermostat QAF81.6M
and
1 set of capillary supports FK-TZ1
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.
Switch status
Normal operation
Frost alarm
X
D
1
0
40685 A
1
2
3
1
2
3
Cold
W
Warm Temperature
X
D
: Switching differential
W : Preselected setpoint
The frost thermostat 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
To prevent damage to the capillary, a minimum bending radius of 20 mm must be
ensured. Mounting is easier if the FK-TZ1 capillary supports are used. (1 set of 6 pieces
is supplied with the frost thermostat.)
FK-TZ1
capillary support (set of 6 pieces)
Withdrawable tray:
It is recommended that the frost thermostat QAF81... should be installed on a purpose-
built withdrawable tray directly downstream of the heating coil. The connecting cable
must be long enough to enable the tray to be inserted and removed without difficulty.
For heating coils with very large cross-sections, a number of frost thermostats can be
fitted and connected in series. In this case, the setpoint must be set individually on each
thermostat.
The ambient temperature affecting the thermostat housing (with the test loop) must be
at least 2 °C above the pre-selected setpoint. If this cannot be guaranteed (e.g.
outdoors or in exposed spaces), the housing and test loop must be installed inside the
supply air unit.
Ordering
Technical design
Operating diagram
Mechanical design
Accessories
Engineering notes
Mounting notes
Frost thermostat
2


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