Siemens QAF81 manual

Siemens QAF81
9.6 · 2
PDF user manual
 · 4 pages
user manualSiemens QAF81
Siemens Building Technologies CA1N1284E / 11.1998
Landis & Staefa Division 1/4

Frost thermostat QAF81...

for air temperature monitoring
Frost protection thermostat to prevent frost damage in air conditioning systems
Robust aluminium die-cast housing
Responds to temperature change sensed over any 30 cm length of capillary
Small switching differential
Good repeatability
Setpoint adjustment – 5 ...15 °C
Protection standard IP65
The frost protection thermostat QAF81... for air-side monitoring of the temperature of
LTHW heating coils in ventilation and air conditioning systems is used to prevent frost
damage. It has a small switching differential and good repeatability. The reset occurs
automatically (manual reset required with QAF81.6M).
The frost thermostat can be used to initiate the following frost protection functions:
– Stop fan
Close outside air dampers
Open heating coil valve 100 %
Start heating coil pump
Switch off chiller (condenser) and humidifier
Trip visual and/or audible frost alarm
The frost thermostat QAF81... trips when the temperature drops below the selected
setpoint over a capillary length of 30 cm.
An automatic reset occurs when the temperature rises above the setpoint again (manual
reset required with QAF81.6M).
3 types of frost monitor are available. They differ in the length of the capillary and in the
Type Reset
Capillary length
automatic reset 3 m
automatic reset 6 m
with lock-out and manual reset 6 m
Typical applications


Type summary

User manual

View the manual for the Siemens QAF81 here, for free. This manual comes under the category Thermostat and has been rated by 2 people with an average of a 9.6. This manual is available in the following languages: English. Do you have a question about the Siemens QAF81 or do you need help? Ask your question here

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Siemens QAF81 specifications

Below you will find the product specifications and the manual specifications of the Siemens QAF81.

Brand Siemens
Model QAF81
Product Thermostats
Language English
Filetype manual_type_manual (PDF)

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