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POWERS® Controls
134-1861 Humidistat
Description
Features
Product Number
Accessories
Warning/Caution Notations
The 134-1861 Humidistat controls humidifying and/or dehumidifying equipment. Typical
uses include the control of humidity by ventilation, air conditioning, humidifiers, and
dehumidifiers in residential, commercial, and industrial installations.
This humidistat has Single-Pole/Double-Throw (SPDT) snap-acting contacts rated to
switch 1/4 hp motors. It has a wide setpoint range of 0 to 70% Relative Humidity (RH), as
well as "off" dial positions for humidification and dehumidification. The differential of the
134-1861 is fixed at approximately 6% RH.
• Human Hair Sensing Element – Provides stable, accurate measurement.
• 1/4 HP (6A) Rated Contacts – Permit direct operation of many fans in commercial
applications.
• High/low Adjustable Knob Range Stops – Allow adjustments within a desired range.
• Enclosed Pennswitch – Provides dust protection for contacts.
• Mounting Plate – Allows easy mounting and wiring without removing the cover.
134-1861
Concealed Adjustment Faceplate, Vertical Mounting
Aluminum Guard
WARNING:
CAUTION:
Technical Instructions
Document No. A6V11435226
Personal injury or loss of life may occur if a procedure is not
performed as specified.
Equipment damage or loss of data may occur if the user
does not follow a procedure as specified
May 9, 2019
134-034
134-117
Siemens Industry, Inc.
Part No 24-8466-00036 Rev. A
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Table of Contents
Summary of Contents for Siemens POWERS 134-1861
- Page 1 Personal injury or loss of life may occur if a procedure is not WARNING: performed as specified. Equipment damage or loss of data may occur if the user CAUTION: does not follow a procedure as specified Siemens Industry, Inc. Part No 24-8466-00036 Rev. A...
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Page 2: Operation
20% RH F (-23 25% RH F (-18 30% RH F (-12 35% RH F (-7 40% RH or Higher as Desired Above 20 F (-7 Page 2 Siemens Industry, Inc. -
Page 3: Specifications
• Required Tools 2 × 4 in. (51 × 102 mm) wall box (field-supplied) • 3-wire cable (field supplied) • Screwdriver (slotted standard) • Marking pencil • Wire strippers Siemens Industry, Inc. Page 3... -
Page 4: Installation
7. Hook the two slots in the humidistat base over the projections on the mounting plate and swing the humidistat into place. Push the wires back flush into the wall box. 8. Securely tighten the mounting plate locking screw. The installation is now complete. Figure 1. 134-1861 Humidistat. Page 4 Siemens Industry, Inc. -
Page 5: Wiring Diagrams
Figure 2. Typical Wiring Diagram of a 134-1861 Used to Reduce Excessive Humidity in a Well-Constructed Building by Manual or Automatic Control of an Exhaust Fan. Figure 3. Dehumidification Control Wiring Diagram. Figure 4. Humidification Control Wiring Diagram. Siemens Industry, Inc. Page 5... - Page 6 5. Release the tab making sure it fits into the nearest notch. 6. Replace the humidistat cover, tighten the bottom cover screw, and replace the adjustment knob. 7. Rotate adjustment knob to desired normal operating setpoint. Page 6 Siemens Industry, Inc.
- Page 7 3. Loosen the bottom cover screw and remove the humidistat cover. CAUTION: Equipment damage hazard. Avoid contact with the human hair sensing element. Contact with the hair element can affect control accuracy and/or product life. Siemens Industry, Inc. Page 7...
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Page 8: Checkout Procedure
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. POWERS is a registered trademark of Siemens Industry, Inc. Other product or company names mentioned herein may be the trademarks of their respective owners.