Siemens QFM81.21 User manual

Installation Instructions

Document No. 129-606

July 15, 2010

QFM81.2, QFM81.21 Duct Hygrostats

Item Number 129-606, Rev. AA Page 1 of 2

Product Description

These instructions explain how to install a QFM81.2

or QFM81.21 Duct Hygrostat.

Product Numbers

QFM81.2 Duct Hygrostat with external setpoint

QFM81.21 Duct Hygrostat

Required Tools

•Screwdriver

•Electric drill

•7 mm Wrench

Expected Installation Time

15 minutes

Installation

Air Duct Mounting

If the duct hygrostat is used for control, mount in the

exhaust air duct after the room to be controlled.

If the duct hygrostat is used for monitoring the

maximum or minimum humidity level, mount in the

supply air duct.

Mounting Positions

The immersion sensor stem must be mounted either

horizontally or vertically with the stem pointing

downward. Do not mount with the stem pointing

upward. (See Figure 1.)

SEN0508R1

Figure 1. Acceptable Mounting Positions.

Ensure that the air to be measured is sufficiently

mixed at the point of measurement for accurate

humidity measurements.

The mounting orientation is dependent on the air

velocity in the ductwork: at <5 m/s, the holes in the

stem must face the airflow; at >5 m/s, they must be

perpendicular to the direction of airflow. (See

Figure 2.)

SEN0509R1

<5m/s

>5m/s

Figure 2. Mounting Orientations.

Minimum Immersion Length

NOTE: When mounting the hygrostat in air ducts,

the minimum immersion length of the stem

is 5.12 inches (130 mm).

The mounting flange supplied with the unit allows

the immersion length to be adjusted between

5.12 inches (130 mm) and 6.14 inches (156 mm).

Figure 3. Mounting Flange.

Document No. 129-606

Installation Instructions

July 15, 2010

Calibration

Wall Mounting

The hygrostat should be mounted: If humidity is known and field calibration is needed,

then the device may be set to known humidity. Use

a 7 mm wrench to adjust until an audible click is

heard. This will calibrate the unit.

•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 adjoining wall.

•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).

•away from sources of heat and refrigeration

(radiators, computers, televisions, concealed

heating pipes, hot or cold water pipes).

•where it is not exposed to direct sunlight.

NOTE: You must use the mounting flange supplied

with the hygrostat for wall mounting.

Wiring

1. Using a flat-blade screw driver, loosen the

mounting screw and remove the cover to

expose the wiring terminals.

Figure 5. Humidity Calibration.

Replace the cover and tighten the mounting screw

with a flat-blade screwdriver.

2. Wire the device as required. See Figure 4. The installation is now complete.

SEN0510R1



1 – 2 Humidification

1 – 3 Dehumidification

Figure 4. Wiring Connections.

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

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]

Document No. 129-606

Printed in the USA

Page 2 of 2

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