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BASE WITH VENTS

(FOR WALL MOUNT)

MOUNTING

HOLES (2)

PUSH BASE

INTO 1” 

HOLE IN 

WALL
OPENING

FOR WIRES

 

 VENTS

WALL

DUCT

MOUNTING

HOLES (2)

PLACE BASE

OVER 1” 

HOLE IN 

DUCT
OPENING

FOR WIRES

 

BASE WITHOUT VENTS

(FOR DUCT MOUNT)

NO 

VENTS

229150

PRECAUTIONS

This Humidistat must be installed by a Qualified Technician. Always turn off power to the HVAC 
system prior to installing or servicing the humidifier or humidistat. Improper operation can 
result in over or under humidification. Over humidification can result in condensation, structural 
damage or mold. Condensation within a building’s structure can cause a loss of structural 
strength. Condensation can also enable mold and mildew growth resulting in personal injury 
and damage to building structure and contents. Older and poorly insulated structures cannot 
withstand the same humidity levels as newer well insulated buildings. Read these instructions 
carefully. This humidistat requires a 24 volt, AC power supply. Improper voltage can cause 
malfunction or damage to the control.  The technical specifications for this product and the 
contents of the user manual are subject to change without notice.

Before Installing or Operating,

PLEASE READ ALL INSTRUCTIONS

Specifications

Electrical Rating  18-30 VAC, 60Hz
Switching Load   1 amp max.
Outdoor Sensor   200 ft. max.

Auto Mode

Control Range  10%-60% RH

Manual Mode

Control Range  10%-75% RH

Automatic 

Digital Humidistat

In Automatic Mode, the Braeburn 229150 Digital Humidistat
will adjust humidity based on the outdoor temperature, 
lowering the humidity in cold weather to reduce 
condensation. The humidistat can operate in Manual Mode 
to control humidity to a specific relative Humidity. In most 
dwellings,  Automatic operation is preferred to reduce 
condensation on windows and within the structure. 
Manual mode is necessary where the outdoor temperature 
sensor cannot be installed. Manual mode may be desirable where valuable artwork, instruments 
or woodwork demand constant humidity. The LCD Display is backlit and easy to read. The 
humidistat can be mounted on an interior wall or on the return duct of the HVAC System.

Outdoor Temp. 

-10˚F, (-23˚C) min

Accuracy RH  

10%-90% +3% RH

Accuracy Indoor Temp.   +1˚F, +1˚C
Accuracy Outdoor Temp.  +1˚F, +1˚C
Resolution 

 1˚ or 1%

Duct Mount Installation

IMPORTANT:

 

Use base without vents for

duct mount installation.

1.

  Choose an accessible location on the 

  main RETURN air duct at least 15 inches 
  from any duct bends.

2.

  Drill a 1 inch diameter hole in the center 

  of your desired mounting location. 

3.

  Using the base as a template, mark 

  two mounting holes and rectangular
  opening (for wires).

4.

 Using a 1/8 inch drill bit, drill two 

  mounting holes. Cut or drill out 
  rectangular opening for wires.

5.

 Secure base to the duct with supplied 

  sheet metal screws. Pull wires 
  through opening.

6.

  Connect wires (see “wiring”) and then

  attach humidistat body to base.

Wall Mount Installation

IMPORTANT:

 

Use base with vents for

wall mount installation. 

1.

 Choose a location in the living area 

  that is clear of drafts or excessive 
  amounts of humidity. Avoid mounting 
  near air ducts, doors or windows.  
  Do not install in bathrooms or kitchens.

2.

 Drill a 1 inch diameter hole in the center 

   of your desired mounting location. 

3. 

 Using base as a template, mark the 

  two mounting holes and rectangular 
  opening (for wires).

4.

  Using a 3/8 inch drill bit, drill two 

  mounting holes  and gently tap in
  supplied anchors. Cut or drill out 
  rectangular opening for wires.

5.

 Secure base to the wall with supplied 

  plastic anchors and screws. Pull wires 
  through opening.

6.

  Connect wires (see “wiring”) and then 

  attach humidistat body to base. 

Wiring

WIRING TO FAN POWER HUMIDIFIER

Remote Sensor Installation

IMPORTANT:

 

Keep remote sensor wires at 

least 6 inches from line voltage wires.

1.

 

If installing the optional outdoor remote 

  sensor, choose a location on the north or 
  east wall of the structure. Install above 
  the snow line away from air intakes or 
  exhaust sources.

2.

  Run two wire (22 gauge minimum) cable 

  from the humidistat SNSR1 and SNSR2 
  terminals to the outdoor location. Attach 
  wire to sensor regardless of polarity. Wire run should not exceed 200 ft. 

3.

 Install the metal hanging bracket with the screws provided. Insert sensor into large 

  opening of bracket and sensor wire into small opening of bracket.

4.

 Use non-hardening caulk to plug any wiring holes after verifying operation of sensor.

 

DROP Button:

 Scrolls through Manual, Automatic and Off modes 

 

THERMOMETER Button:

 Scrolls through indoor humidity (default), indoor temperature  

 

and outdoor temperature (if outdoor sensor is connected).

 

F˚ / C˚   F˚ / C Button: 

Used to select Fahrenheit or Celsius display mode. 

  DOWN and UP Buttons: 

Use to adjust settings up or down.

Buttons: 

Press the DOWN and UP buttons at the same time to enter OFFSET mode 

(see”OFFSET”).

+

+

Buttons: 

Press the DROP and THERMOMETER buttons at the same time for 5 seconds. 

The humidistat will enter the TEST mode. (see “Testing the System”)

Quick Reference

“House” Symbol: 

Indoor temperature indicator.

“Tree” Symbol: 

Outdoor temperature indicator.

“Bar” Symbol: 

Humidity index indicator (Automatic Mode Only).

SNSR 

1

SNSR 

2

HUM

1

HUM

2

AC

 N

AC

 L

Constant

24 Volts

Yellow

Yellow

120 Volts

Switched

w/Furnace

Operation

SNSR 

1

SNSR 

2

HUM

1

HUM

2

AC

 N

AC

 L

Constant

24 Volts

Outdoor Sensor

24 Volts

Switched 

w/Furnace

Operation

WIRING TO 24 VAC HUMIDIFIER

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