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The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2015 Johnson Controls, Inc. www.johnsoncontrols.com
R-74
MS Series Temperature Stage Control Modules
Description
The MS Series Temperature Controls are
versatile, microprocessor-based, multifunction,
programmable temperature controls. They are
designed for single and multiple-stage
temperature control applications.
Depending on the model selected, the
MS Series Controls can operate in the following
modes:
• Direct mode
• Reverse mode
• Deadband mode
• Independent Setpoint mode
The MS Series Controls have large,
easy-to-read, red LED displays. These
compact controls are available in panel mount
and DIN rail mount models. MS Series Controls
use the A99B temperature sensors, which allow
remote mounting of the display unit.
Refer to the MS Series Multi-Stage Electronic
Temperature Controls Product Bulletin
(LIT-125198) for important product application
information.
Features
• programmable functions allow
adjustment of control settings to meet
application needs
• alarm management functions provide
visible alarm codes on the display
• easily readable LED display shows
temperature and functions quickly and
clearly
• programming button lockout allows user
to disable programming buttons to deter
accidental or unauthorized changes
• accurate temperature sensors provide
precise control performance with up to
300 feet of wiring (An adjustable offset is
provided for longer wiring)
• self-test procedure checks control
operation by cycling all outputs and
testing all LEDs
Applications
Application MS1 Series Single-Stage MS2 Series Two-Stage MS4 Series Four-Stage
Rooftop heating or cooling units 
Boiler or pump control 
Convenience store coolers 
Space temperature control 
Cooling tower pump control 
Compressor or chiller staging 
Reach-in coolers 
Supermarket display cases for produce 
Restaurant and Convenience store walk-in coolers 
Selection Chart
Accessories
Product Code Number Description Shipping Weight, lb (g)
MS1DR24T-11C MS1 Single-stage, DIN Rail Mount Temperature Control, A99BB-200C sensor included 0.75 (340)
MS2DR24T-11C MS2 Two-stage, DIN Rail Mount Temperature Control, A99BB-200C sensor included 0.79 (360)
MS2PM24T-11C MS2 Two-stage, Panel Mount Temperature Control, A99BB-200C sensor included 0.53 (240)
MS4DR24T-11C MS4 Four-stage, DIN Rail Mount Temperature Control, 2 A99BB-200C sensors included 1.17 (530)
MS4PM24T-11C MS4 Four-stage, Panel Mount Temperature Control, 2 A99BB-200C sensors included 0.90 (410)
Product Code Number Description
A99BB-200C Temperature Sensor: Range: -40 to 212°F (-40 to 100°C)
Cable length and type: 6-1/2 ft (2 m) PVC
A99BB-300C Temperature Sensor: Range: -40 to 212°F (-40 to 100°C)
Cable length and type: 9-3/4 ft (3 m) PVC
A99BB-500C Temperature Sensor: Range: -40 to 212°F (-40 to 100°C)
Cable length and type: 16-3/8 ft (5 m) PVC
A99BB-600C Temperature Sensor: Range: -40 to 212°F (-40 to 100°C)
Cable length and type: 19-1/2 ft (6 m) PVC
A99BA-200C Temperature Sensor: Range: -40 to 212°F (-40 to 100°C)
Cable length and type: 6-1/2 ft (2 m) Shielded
MS4 Series Panel and DIN Rail Mount,
Multi-Stage, Electronic
Temperature Controls
Multi-Stage Electronic Temperature Controls
Code No. LIT-1900004
Repair Information
If the MS Series Temperature Stage Control
Modules fails to operate within its specifications,
replace the unit. For a replacement control,
contact the nearest Johnson
Controls®
representative.