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 Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital - Single-Stage Electronic Temperature Controls
JOHNSON CONTROLSSingle-Stage Electronic Temperature Controls

JOHNSON CONTROLS Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital

The JOHNSON CONTROLS A421GBF-02C is a single-stage electronic temperature control for cooling applications. It operates on 24V AC input voltage and is compatible with the A99 series. This digital control features a…

SKU 3G-OTH-68657

Brand
JOHNSON CONTROLS
Item
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital
Category
Single-Stage Electronic Temperature 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
A421GBF-02C
Type
Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, A99
AC
24V
Application
Cooling Control
Product Type
Temperature Control
Input Voltage
24V AC
Compatible with Series
A99
Variable Output Voltage
No
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 A421GBF-02C is a single-stage electronic temperature control for cooling applications. It operates on 24V AC input voltage and is compatible with the A99 series. This digital control features a single SPDT output and a temperature range of -40°F to 212°F, with no variable output voltage.

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 single-stage electronic temperature 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
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, 24V AC, A99 (MPN A421GEF-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421GEF-02C; Product Type: Temperature Control; Application: Chiller Control; Brand: JOHNSON CONTROLS; Input Voltage: 24V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, 24V AC, A99 (MPN A421GEF-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421GEF-02C; Product Type: Temperature Control; Application: Chiller Control; Brand: JOHNSON CONTROLS; Input Voltage: 24V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AEC-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AEC-02C; Product Type: Temperature Control; Application: Cooling Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AEC-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AEC-02C; Product Type: Temperature Control; Application: Cooling Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AEC-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AEC-01C; Product Type: Temperature Control; Application: Temperature Sensing and Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AEC-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AEC-01C; Product Type: Temperature Control; Application: Temperature Sensing and Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABG-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABG-02C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABG-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABG-02C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Cool Only, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABT-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABT-02C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Cool Only, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABT-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABT-02C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-04C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-04C; Product Type: Temperature Control; Application: Damper Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-04C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-04C; Product Type: Temperature Control; Application: Damper Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.

More from JOHNSON CONTROLS

View all JOHNSON CONTROLS parts →
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, 24V AC, A99 (MPN A421GEF-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421GEF-01C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 24V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, 24V AC, A99 (MPN A421GEF-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421GEF-01C; Product Type: Temperature Control; Application: Heating Control; Brand: JOHNSON CONTROLS; Input Voltage: 24V AC; Compatible with Series: A99.
JOHNSON CONTROLS
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-02). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-02; Product Type: Temperature Control; Application: Temperature Sensing and Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AET-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AET-01C; Product Type: Temperature Control; Application: Cooling Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AET-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AET-01C; Product Type: Temperature Control; Application: Cooling Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-06C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-06C; Product Type: Temperature Control; Application: Fan Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-06C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-06C; Product Type: Temperature Control; Application: Fan Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-03C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-03C; Product Type: Temperature Control; Application: Boiler Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-03C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-03C; Product Type: Temperature Control; Application: Boiler Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AED-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AED-01C; Product Type: Temperature Control; Application: Chiller Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AED-01C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421AED-01C; Product Type: Temperature Control; Application: Chiller Control; Brand: JOHNSON CONTROLS; Input Voltage: 240V AC; Compatible with Series: A99.
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-02C; Product Type: Temperature Control; Application: Boiler Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-02C). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421ABC-02C; Product Type: Temperature Control; Application: Boiler Control; Brand: JOHNSON CONTROLS; Input Voltage: 120V AC; Compatible with Series: A99.
JOHNSON CONTROLS
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital, 1, SPDT, 24V AC (MPN A421GBF-02). Key specifications — Variable Output Voltage: No; Manufacturer Part Number: A421GBF-02; Product Type: Temperature Control; Application: Boiler Control; Brand: JOHNSON CONTROLS; Input Voltage: 24V AC.