Technical Instructions
POWERS Controls 134-1861 Humidistat
Document Number A6V11435226
May 9, 2019
Page 6
Siemens Industry, Inc.
Figure 5. Schematic Wiring Diagram of a 134-1861 Automatically Operating a
Humidifier or Dehumidifier as Selected by the Manual Changeover Switch.
Figure 6. Schematic Wiring Diagram of a 134-1861 Automatically Operating an
Exhaust Fan at Full Speed to Control Excessive Humidity. A Combination Speed
Control and “On/Off” Switch Permits Manual Operation of an Exhaust Fan at
Selected Speeds.
Range Stops
High and low range stops of the humidistat can be field adjusted as desired. Use the
following procedures to set the high and low range stops.
High Range Stop
1. Set the adjustment knob to the maximum desired RH setting.
2. Pull the adjustment knob off the humidistat cover.
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.
4. While holding the dial firmly in place, keep the setting in line with the calibrating
mark, press Tab
A
(see Figure 7) and rotate it counterclockwise until it is
against Stop Pin
C
.
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.
