Siemens QAF81 Bedienungsanleitung

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Siemens Building TechnologiesCA1N1284E / 11.1998

Landis & Staefa Division1/4

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Frost thermostatQAF81...

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

reset:

TypeReset

Capillary length

QAF81.3

automatic reset3 m

QAF81.6

automatic reset6 m

QAF81.6M

with lock-out and manual reset6 m

Use

Typical applications

Functions

Type summary

Produktspezifikationen