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CONTENTS
Description .............................................................................. 1
Precautions ............................................................................. 1
Specifications .......................................................................... 2
Installation ............................................................................... 2
Select Humidity Control Location
Route Wires to Location
Wiring
Attach Humidity Control to Wall
Operation ................................................................................ 4
Humidistat Control
Dehumidistat Control
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
These wall-mounted, line or low voltage humidity controls
are available as a Humidistat commonly used to control
and operate a furnace humidifier or as a Dehumidistat
commonly used to cycle an air conditioning system to
control humidity in an unoccupied home to prevent mil-
dew build-up associated with high humidity levels.
These humidity controls feature a moisture-sensitive
nylon sensing element and also provide positive ON-OFF
settings for manual operation.
Operator: Save these instructions for future use!
If in doubt about whether your wiring is line, or low voltage,
have it inspected by a qualified heating and air condition-
ing contractor, electrician, or someone familiar with basic
electricity and wiring.
Do not exceed the specification ratings.
All wiring must conform to local and national electrical
codes and ordinances.
PRECAUTIONS
This control is a precision instrument, and should be
handled carefully. Rough handling or distorting compo-
nents could cause the control to malfunction.
To prevent electrical shock and/or equipment dam-
age, disconnect electric power to system, at main
fuse or circuit breaker box, until installation is
complete.
Do not short out terminals on primary control to
test. Short or incorrect wiring will burn out humid-
ity control and could cause personal injury and/or
property damage.
2271W
2274W
CAUTION
Do not use on circuits exceeding the rated volt-
age. Higher voltage will damage control and could
cause shock or fire hazard.
WARNING
2271/72/73/74W
Line or Low Voltage
Humidistat / Dehumidistat
INSTALLATION INSTRUCTIONS
PART NO. 37-9600D
Replaces 37-9600C
0528
White-Rodgers is a division
of Emerson Electric Co.
www.white-rodgers.com