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Johnson Controls S351 Humidity Stage Module

Humidity Stage Module

The S351 Stage Module is used in conjunction with the W351 Humidity Control to add multiple staging capability. Using a Y350R, up to five S351s can be added to the W351 via the 5-pin, plug-together connector. Using a 24 VAC or greater external transformer, up to nine S351s can be added. The S351 has an SPDT output relay and three adjustments including offset (de-energize stage action from setpoint), humidification or dehumidification mode, and differential.




• humidification or dehumidification mode, field selectable
• adjustable differential and offset
• 5-pin connectors eliminate wiring between modules




Select a link under the "item" tab below to order.

Cat #OutputDifferential TemperatureOffset
S351AA-1CSPDT Relay2 to 10% RH2 to 30% RH
Case and Cover Material: NEMA 1, high-impact thermoplastic
Supply Voltage: 24 volt power supply provided by Y350R or external 24 VAC transformer
Power Consumption: 1 VA max.
Ambient Temperature: Operating -30 to 150°F (-34 to 66°C)
Shipping -40 to 185°F (-40 to 85°C)
Ambient Humidity: Operating 10 to 90% RH non-condensing
Shipping 0 to 95% RH non-condensing
Relay: SPDT enclosed relays, contacts rated at
10 amp non-inductive, 1/2 hp, 120/240 VAC
Mounting: Surface or DIN rail

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