Siemens QAF81 Manual

Siemens Termostat QAF81

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 3.7 stjerner ud af 5 anmeldelser. Har du et spørgsmål om Siemens QAF81, eller vil du spørge andre brugere om produktet?

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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

40685 A

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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