Siemens QFA1000 Betriebsanleitung

QFA1000, QFA1001

Technical Instructions

Document No. 155-708

July 19, 2010

Room Hygrostats

QFA1001

QFA1000

Siemens Industry, Inc.

Description The room hygrostats are used for controlling and monitoring relative humidity in

ventilation or air conditioning facilities. They ensure room humidity control within the

selectable range of 30 to 90% relative humidity by controlling humidification or

dehumidification equipment. They can also be used for monitoring minimum or

maximum humidity levels.

Features •Hygrostat with single-pole microswitch

•Humidity measuring element made of stabilized plastic

•Setpoint knob for the upper switching point

•Mounts directly on the wall or on a recessed conduit box

Application •For controlling humidification equipment

•For controlling dehumidification equipment

Product Numbers

Switching Differential1

Product

Number Setpoint Setting

Range Statically Dynamically

Setpoint

Adjustment

QFA1000 Internally

QFA1001 30 to 90% rh Approx. 4% rh 6% rh Externally

1) The static switching differential is determined at a constant ambient humidity by

turning the setting knob.

The dynamic switching differential is determined by changing the ambient humidity

while maintaining the same setpoint adjustment; only the dynamic switching

differential is of practical value.

Technical Instructions QFA1000, QFA1001 Room Hygrostats

Document Number 155-708

July 19, 2010

Page 2 Siemens Industry, Inc.

Mode of Operation The hygrostat acquires the relative humidity of the ambient air with its humidity

measuring element, which is a stabilized, plastic strip. The strip actuates a microswitch

with a fixed switching differential Xdand a potential-free contact output (SPDT),

depending on the relative humidity of the air. If the actual humidity deviates from the

adjusted setpoint, the hygrostat switches the associated humidification or

dehumidification equipment on or off as shown in the following function diagram

(Figure 1).

Figure 1. Function Diagram.

rh Relative humidity in %

S1 Microswitch

1−2 Humidification

1−3 Dehumidification

w Setpoint

x Actual value

dSwitching differential

t Time

Due to the measuring element’s aging effect, the switching point drifts slowly and

constantly. For this reason, recalibration may be required in due time.

At temperatures other than the calibration temperature, the switching point drifts

systematically (temperature influence). Also, in the case of fast humidity changes, the

switching point will temporarily be shifted.

Mechanical Design

QFA1001

The room hygrostat is designed for wall mounting, and fits on most commercially

available recessed conduit boxes. The cables are introduced either from the rear

(recessed conduit boxes) or from above (surface-run wires), after removing the knock-

outs.

The unit consists of base and cover that can be separated (snap-on connection).

The base accommodates the humidity measuring element, setpoint setting element

with setting spindle, scale, microswitch, and screw terminals.

The cover carries the removable setpoint knob with its imprinted scale.

QFA1000 This model has the same basic design as the QFA1001, but without an external

setpoint knob. The setpoint can only be adjusted when the cover is removed.

QFA1000, QFA1001 Room Hygrostats Technical Instructions

Document Number 155-708

July 19, 2010

Siemens Industry, Inc. Page 3

Operating Elements

1 Setpoint knob with scale – only with QFA1001

2 Setpoint setting spindle

3 Scale for setpoint adjustment with QFA1000

Figure 2. Operating Elements.

Mounting Notes

Mounting Choices

The base has cable entries at the rear for mounting the room hygrostat on recessed

conduit boxes. For wall mounting, appropriate holes at the top or bottom can be

knocked out.

Mounting Location The hygrostat should be mounted on an inner wall approximately 4.9 feet (1.5 m) above

the floor and at least 1.6 feet (0.5 m) from the closest wall.

Mount the unit where there is a natural circulation of room air (do not mount near drafts,

in corners, behind curtains, too close to doors and windows, or on an outer wall).

Sources of heat and refrigeration (radiators, computers, televisions, concealed heating

pipes, hot or cold water pipes) must be at an adequate distance.

The hygrostat should not be exposed to direct sunlight.

Mounting Instructions Installation Instructions for the room hygrostat are available online.

Specifications

Functional data

Setpoint range 30 to 90% rh

Temperature operating range 32°F to 122°F (0°C to 50°C)

Humidity measuring element Stabilized plastic band

Control mode Two-position

Time constant (v = 0.2 m/s) Approximately 5 minutes

Switching differential See Product Numbers

Setting accuracy +5% rh (can be improved by

calibrating on site)

Temperature influence +0.5% rh/K

Humidity calibration at 55% rh, 73°F (23°C)

Long-term stability Approximately −1.5% rh/a

Type of switch Potential-free microswitch (SPDT)

Contact rating

Maximum 5 (3) A, 24 Vac/Vdc

Minimum 100 mA, 24 Vac/Vdc

Protective data Degree of housing protection P 20 to EN 60 529

Safety class II to EN 60 730

Electrical connection Screw terminals for Maximum 2 × 16 AWG

Technical Instructions QFA1000, QFA1001 Room Hygrostats

Document Number 155-708

July 19, 2010

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as

design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners.

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089-4513

U.S.A.

Your feedback is important to us. If you have

comments about this document, please send them

to SBT_technical.editor.[email protected]

Materials and colors Base PPS, Fortron, fiberglass reinforced,

Black

Cover PC Lexan 940, pure-white

Humidity measuring element Plastic

Standards conformity

EMC directive 89/336/EEC

UL UL873

cUL Canadian Standard C22.2 No. 24-93

Weight QFA1001 3.17 ounces (0.090 kg)

QFA1000 3.17 ounces (0.090 kg)

Wiring Diagrams

Internal Diagram

1-2 Humidification

1-3 Dehumidification

Wiring Diagrams

Figure 3. Humidification.

Figure 4. Dehumidification.

Dimensions

Figure 5. Dimensions in Inches (Millimeters).

Document No. 155-708

Printed in the U.S.A.

Page 4

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