Siemens QAF81 Bruksanvisning
Sidor 4 Engelska Termostat
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Siemens Building TechnologiesCA1N1284E / 11.1998
Landis & Staefa Division1/4
1
284
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
Produktspecifikationer
| Varumärke: | Siemens |
| Kategori: | Termostat |
| Modell: | QAF81 |
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