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Electronic Proportional Plus Integral Humidity Control, 10-90% RH, NO SENSOR

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Manufacturer: Johnson Controls

Description: PROP HUM CTR,10-90%RH,NO SENSR

Category: Environmental Controls

Sub Category: Humidity Controls

System 350TM W351P Electronic Proportional Plus Integral Humidity Control

The W351P control is an electronic, proportional plus
integral humidity control with analog 0-10 VDC and
0-20 mA outputs. The W351P control has three
user-electable integration constants, a wide setpoint
range of 10-90% RH, and an adjustable throttling
range of 2-20% RH.
The W351P control is designed to work with an
HE-67S3-0N0BT Room Sensor Humidity Transmitter
or HE-67S3-0N00P Duct Sensor Humidity Transmitter.
Like all System 350 products, the W351P control
housing is a NEMA 1, high-impact plastic enclosure.
The modular design provides easy, plug-together
connections for quick installation and future

Features and Benefits

❑ Modular Design Provides the flexibility to add up to four S351 Stage Modules, a
D351 Humidity Display Module, and a Y350R Power Module

❑ Plug-together Connectors and
35 mm DIN Rail Mounting
Eliminates wiring between modules and reduces installation costs

❑ Adjustable Setpoint Range of
10-90% RH
Reduces inventory by covering the humidity range required to
support most humidity applications

❑ Adjustable Minimum Output Signal Allows the user to adjust the minimum output between 0-60% of
the output signal voltage; can also be used to set minimum valve

❑ Adjustable Throttling
Range of 2-20% RH
Enables user to match the amount of control (maximum to
minimum) to application requirements

❑ Humidification or Dehumidification
Modes of Operation
Works in a variety of humidification or dehumidification

❑ Three Selectable Integration
Allows user to adjust system recovery rate to setpoint humidity at
Slow, Medium, or Fast to meet application requirements

❑ Interchangeable Humidity
Increases versatility and serviceability

Application Requirements

IMPORTANT: All System 350 controls are
intended to control equipment
under normal equipment
operating conditions. Where
failure or malfunction of
System 350 controls could lead
to an abnormal operating
condition that could cause
personal injury or damage to the
equipment or other property,
other devices (limit or safety

controls) or systems (alarm or
supervisory) intended to warn of,
or protect against, failure or
malfunction of the
System 350 controls must be
incorporated into and maintained
as part of the control system.

The W351P Humidity Control can operate as a
standalone device or in conjunction with add-on
modules. With the addition of S351 Stage Modules,
the humidity system can control a variety of single or
multiple-stage humidity applications.
A typical application for the W351P control is
modulating steam valves for humidification.

A typical System 350 humidity control scheme
includes the following:

• W351P Humidity Control

• Y350R Power Module (or 24 VAC transformer)

• up to four S351 On/Off Stage Modules

• D351 Digital Humidity Display Module

• HE-67S3-0N0BT Wall Mount or
HE-67S3-0N00P Duct Mount Humidity Transmitter


The W351P control operates on 24 VAC/VDC and
provides two simultaneous analog outputs:
0 to 10 VDC and 0 to 20 mA.
A ten-segment front panel Light-Emitting Diode (LED)
indicates percentage of output.

Features include:

• adjustable setpoint

• adjustable minimum output

• adjustable throttling range (proportional band)


Replaces Part Numbers: W351PP-1, CARW351PP-1

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