Siemens QAF81 Bruksanvisning
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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
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• • Robust aluminium die-cast housing
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•
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• • Responds to temperature change sensed over any 30 cm length of capillary
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•
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• • Small switching differential
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•
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• • Good repeatability
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•
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• • Setpoint adjustment – 5 ...15 °C
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• • 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
Siemens Building Technologies CA1N1284E / 11.1998
Landis & Staefa Division 3/4
The capillary must be mounted on the downstream side of the heating coil (and on the
upstream side in the case of coiling coils). It should be looped diagonally across the
heat exchanger pipes at a distance of approximately 5 cm, and should cover the entire
area evenly. For test purposes, it is advisable to leave a loop of approximately 20 cm
directly beneath the housing outside the entry to the duct.
To prevent damage to the capillary it should be protected by grommets or similar where
it passes through metal walls. The capillary has a minimum bending radius of > 20 mm.
Tighter bends must be avoided. Use capillary supports FK-TZ1!
50346
After removal of the locking screw (under the housing cover) the setpoint can be
adjusted from above with a screwdriver.
To simulate frost conditions, the test loop can be immersed in a vessel of iced water.
A frost alarm can also be initiated by short-circuiting terminals 1 and 2.
To simulate frost with the QAF81.6M, pull out the reset button (on the housing base).
The frost thermostat is maintenance-free.
Correct operation of the device can be checked by immersing the test loop in a vessel
of iced water.
Setpoint adjustment range XK– ° ° 5 ... 15 C (23 ... 59 F)
Factory setting 5 °C (41 °F)
Switching differential 2 ° ° ° °C ±1 C (3.6 F ±1.8 F)
Repeatability ± 0.5 °C (± 0.9 °F)
Responsive length of sensor Approx. 0.3 m
Type of switch Single pole change-over
Contact rating AC 250 V, 10(2)A
Reset mechanism: QAF81.3 , QAF81.6 Automatic
QAF81.6M Manual
Admissible medium Air
Orientation Any
Materials:
Housing Die-cast aluminium
Bellows housing Copper
Capillary Copper
Capillary contents Freon R134a
Electrical connection 3 screw terminals, 1.5 mm
2
Cable entry Threaded PG 13.5
Protection class I (to IEC730-1)
Protection standard IP65 to IEC529
Ambient temperature:
Max. operating temperature 70 ° °C (158 F)
Min. operating temperature XK + min. 2 C (+ min. 3.6 ° °F)
Storage – 30 ... 70 22 ...158 F)°C (– °
Destruction limit 140 °C (284 °F)
Weight (including packaging) 0.9 kg
Maintenance None required
Conformity Meets the requirements for CE marking
Capillary
Commissioning
notes
Frost simulation
Maintenance notes
Technical data
Produktspecifikationer
| Varumärke: | Siemens |
| Kategori: | Termostat |
| Modell: | QAF81 |
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