Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, 30° to 110°F, 3.5°F - Indoor Two-Stage Controls
JOHNSON CONTROLSIndoor Two-Stage Controls

JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, 30° to 110°F, 3.5°F

The JOHNSON CONTROLS A28AA-4C is a line-voltage mechanical thermostat for heat-or-cool control, housed in a steel enclosure. It features a 30° to 110°F range with a 3.5°F differential, operates on 24 to 277V AC, and…

SKU 3G-OTH-203284

Brand
JOHNSON CONTROLS
Item
Line Volt Mechanical Tstat: Heat or Cool, Steel, 30° to 110°F, 3.5°F
Category
Indoor Two-Stage Controls
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

JOHNSON CONTROLS
Manufacturer Part Number
A28AA-4C
Type
Steel, 30° to 110°F, 3.5°F
AC
24 to 277V
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

JOHNSON CONTROLS Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The JOHNSON CONTROLS A28AA-4C is a line-voltage mechanical thermostat for heat-or-cool control, housed in a steel enclosure. It features a 30° to 110°F range with a 3.5°F differential, operates on 24 to 277V AC, and uses a hydraulic air coil with (2) SPDT, open/close on rise switches.

Frequently Asked Questions

What is the JOHNSON CONTROLS A28AA-4C thermostat used for?

The JOHNSON CONTROLS A28AA-4C is a line-voltage mechanical thermostat used for heat-or-cool control in commercial or industrial HVAC systems. It is suitable for indoor two-stage control applications where a steel enclosure and hydraulic air coil sensing are required.

What are the specifications of the JOHNSON CONTROLS A28AA-4C?

The A28AA-4C operates on 24 to 277V AC, has a temperature range of 30° to 110°F with a 3.5°F differential, and features (2) SPDT open/close on rise switches. It uses a hydraulic air coil sensor and is housed in a steel enclosure for heat-or-cool control.

Where to buy the JOHNSON CONTROLS A28AA-4C worldwide?

You can source the JOHNSON CONTROLS A28AA-4C through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.

How to install the JOHNSON CONTROLS A28AA-4C thermostat?

Install the A28AA-4C by mounting the steel enclosure on a wall or panel, connecting line-voltage power (24 to 277V AC) to the (2) SPDT switches, and positioning the hydraulic air coil in the controlled airstream. Follow standard HVAC wiring practices and verify the 30° to 110°F setpoint range.

Used in

Common applications for JOHNSON CONTROLS
Industrial refrigeration — Johnson Controls P170SA-1C dual pressure control for compressor protection in ammonia or halocarbon systems
Chiller plant automation — Johnson Controls VA7810-HGA-2 electric globe valve actuator for modulating chilled water flow in VG7000 series valves
Pneumatic HVAC retrofit — Johnson Controls T-4002-302 conversion kit for upgrading existing Robertshaw thermostats in commercial buildings
Cooling tower water management — Johnson Controls V-4332-1007 pneumatically actuated diaphragm valve for 3-way diverting of water flow
Boiler fuel oil pressure monitoring — Johnson Controls P545NCB-25C electronic lube oil pressure control with alarm for burner management systems
Process pressure sensing — Johnson Controls P599AAPS105C pressure transmitter with IP67 rating for washdown zones in food and beverage plants

JOHNSON CONTROLS Products

3G Electric supplies JOHNSON CONTROLS indoor two-stage controls. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, 30° to 110°F, 3.5°F, 24 to 277V AC (MPN A19BAC-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 3.5°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, 30° to 110°F, 3.5°F, 24 to 277V AC (MPN A19BAC-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 3.5°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 100°F, 3° to 12°F (MPN A19BBC-2C). Key specifications — attr400419: 120 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 100°F; attr400417: 3° to 12°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 100°F, 3° to 12°F (MPN A19BBC-2C). Key specifications — attr400419: 120 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 100°F; attr400417: 3° to 12°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 40°C, 1.8° to 7.2°C (MPN A19BBC-4C). Key specifications — attr400419: 120 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 40°C; attr400417: 1.8° to 7.2°C; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Steel, -30° to 40°C, 1.8° to 7.2°C (MPN A19BBC-4C). Key specifications — attr400419: 120 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: -30° to 40°C; attr400417: 1.8° to 7.2°C; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat Only, Steel, 30° to 110°F, 1.5°F, 24 to 277V AC (MPN A19BAF-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 1.5°F; attr400418: Hydraulic Air Coil; attr400408: Heat Only; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat Only, Steel, 30° to 110°F, 1.5°F, 24 to 277V AC (MPN A19BAF-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 1.5°F; attr400418: Hydraulic Air Coil; attr400408: Heat Only; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat Only, Steel, 30° to 110°F, 1.7°C, 24 to 600V AC (MPN A19BAC-3C). Key specifications — attr400419: 24 to 600V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 1.7°C; attr400418: Hydraulic Air Coil; attr400408: Heat Only; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat Only, Steel, 30° to 110°F, 1.7°C, 24 to 600V AC (MPN A19BAC-3C). Key specifications — attr400419: 24 to 600V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 1.7°C; attr400418: Hydraulic Air Coil; attr400408: Heat Only; attr408361: JOHNSON CONTROLS; attr400410: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Plastic, 30° to 110°F, 3° to 12°F (MPN A19PRC-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 3° to 12°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Plastic.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: Heat or Cool, Plastic, 30° to 110°F, 3° to 12°F (MPN A19PRC-1C). Key specifications — attr400419: 24 to 277V AC; attr400424: SPDT, Open/Close on Rise; attr400415: 30° to 110°F; attr400417: 3° to 12°F; attr400418: Hydraulic Air Coil; attr400408: Heat or Cool; attr408361: JOHNSON CONTROLS; attr400410: Plastic.

More from JOHNSON CONTROLS

View all JOHNSON CONTROLS parts →
JOHNSON CONTROLS Line Volt Mechanical Tstat: -30° to 100°F, Steel, Adj, 5°/2° to 7°F (MPN A28AA-29C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: -30° to 100°F; Temperature Differential: 5°/2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 8 ft Capillary, 8 ft x 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: -30° to 100°F, Steel, Adj, 5°/2° to 7°F (MPN A28AA-29C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: -30° to 100°F; Temperature Differential: 5°/2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 8 ft Capillary, 8 ft x 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: 40° to 90°F, Steel, Adj, 3.5°/2° to 7°F (MPN A28AA-36C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 40° to 90°F; Temperature Differential: 3.5°/2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 6 ft Capillary, 6 ft x 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: 40° to 90°F, Steel, Adj, 3.5°/2° to 7°F (MPN A28AA-36C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 40° to 90°F; Temperature Differential: 3.5°/2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 6 ft Capillary, 6 ft x 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.
JOHNSON CONTROLS Line Volt Mechanical Tstat: 20° to 80°F, Steel, Adj, 2° to 7°F, 24 to 277V AC Volt (MPN A28GA-23C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 20° to 80°F; Temperature Differential: 2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 6 ft Capillary, 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.
JOHNSON CONTROLS
JOHNSON CONTROLS Line Volt Mechanical Tstat: 20° to 80°F, Steel, Adj, 2° to 7°F, 24 to 277V AC Volt (MPN A28GA-23C). Key specifications — Switch Type/Action: SPDT, Open/Close on Rise; Temperature Control Range: 20° to 80°F; Temperature Differential: 2° to 7°F; Voltage: 24 to 277V AC; Capillary Length/Bulb Diameter: 6 ft Capillary, 3/8 in Bulb; Brand: JOHNSON CONTROLS; Differential Type: Adjustable; Enclosure Material: Steel.