Johnson Controls S350AA-1C Temperature Stage Module

Product Description

The JOHNSON CONTROLS S350AA-1C is a multi-stage temperature module designed to expand the staging capability of compatible A350-series temperature controls. The S350AA-1C includes an SPDT output relay and three field-adjustable settings: offset (de-energize stage action from set point), heating or cooling mode selection, and differential. The Fahrenheit-scaled dial makes it straightforward to configure for the target application without unit conversion. This module is installed by HVAC technicians working on commercial or light commercial temperature control systems that require sequential staging beyond a single-stage controller.

The S350AA-1C is used in conjunction with the A350, A350E, A350P, and A350R series temperature controls. When paired with a Y350R, up to nine S350AA-1C modules can be added to an A350, A350E, or A350R controller via the 5-pin plug-together connector. When used with an A350P and a Y350R, up to four S350AA-1C modules can be added. Using an external transformer rated at 40 VA or greater with an A350P allows up to nine S350AA-1C modules to be connected, supporting large multi-stage systems.

Key Features

• SPDT output relay provides reliable stage switching
• Fahrenheit temperature scale for direct field configuration
• Adjustable differential for fine-tuned stage control
• Selectable heating or cooling mode of operation
• Adjustable offset setting for de-energize stage action from set point
• 5-pin plug-together connector for clean daisy-chain installation

Compatibility

Compatible with A350, A350E, A350P, and A350R series temperature controls. Requires a Y350R accessory for multi-module expansion. Use with an external transformer of 40 VA or greater when connecting up to nine modules to an A350P.

Installation Notes

Installation should be performed by a qualified HVAC technician familiar with low-voltage control wiring. Power down the control system and disconnect the transformer before connecting or disconnecting the S350AA-1C module. The 5-pin plug-together connector must be fully seated to ensure proper communication and relay operation. Follow all applicable local codes and the A350-series controller documentation when configuring staging sequences.