Siemens QAF81 Manual


Læs gratis den danske manual til Siemens QAF81 (4 sider) i kategorien Termostat. Denne vejledning er vurderet som hjælpsom af 9 personer og har en gennemsnitlig bedømmelse på 5.0 stjerner ud af 5 anmeldelser. Har du et spørgsmål om Siemens QAF81, eller vil du spørge andre brugere om produktet?

Side 1/4
Siemens Building Technologies CA1N1284E / 11.1998
Landis & Staefa Division 1/4
1284
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
reset:
Type 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
Use
Typical applications
Functions
Type summary
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
XD
1
0
40685 A
1
2
3
1
2
3
Cold W Warm Temperature
XD: 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


Produkt Specifikationer

Mærke: Siemens
Kategori: Termostat
Model: QAF81

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