A421 Series Electronic Temperature Controls

1 Single-Stage Electronic Temperature Controls Code No. LIT-1900933. A421 Series Electronic Temperature Controls Description Features The A421 Series Electronic Temperature easy-to-read, bright, adjustable backlit LCD. Controls are single-stage Controls with a screen displays the Temperature , single-pole, double-throw (SPDT) output parameters, and status clearly and allows relay. you to adjust LCD brightness for the ambient light conditions. Custom icons on A421 Controls feature a bright backlit LCD the display provide visual cues on system with adjustable brightness and a three-button and control status. touchpad interface that can be set up to basic and advanced programming menus restrict user adjustments. An LED indicates allow you to easily set up your control the output relay's On/Off status. Standard application on the LCD using a simple A421 Series control modules have simple On three-button touchpad interface.

2 And Off Temperature settings for heating or adjustable On and Off Temperature cooling, an adjustable anti-short cycle delay, setpoints enable easy to set up cooling or Temperature setback, and sensor offset heating control applications on the capability. The Temperature control range is three-button touchpad, eliminating the A421 Series Electronic Temperature -40 to 212 F or -40 to 100 C. need to remove the cover and reposition control The A421 Controls are available either in jumpers for reverse or direct control Type 1 (NEMA), IP20 (CE), high-impact plastic actions. parameter adjustment restriction allows enclosures suitable for surface or DIN rail high and low Temperature setpoint you to lock the control 's setup parameters mounting or in Type 4X (NEMA), IP67 (CE) adjustment stops allow you to set up your and restrict user adjustments to just the On watertight, corrosion resistant surface mount application for your desired range of and Off Temperature setpoint values within enclosures.

3 Adjustment and restrict user adjustment to your defined setpoint adjustment range. Refer to the A421 Series Electronic just the desired Temperature adjustment low- and line-voltage control models Temperature Controls Product Bulletin range. provide industry standard control voltage (LIT-12011972) for important product displayed Temperature offset allows you to options for most refrigeration and HVAC. application information. adjust the displayed Temperature to the control applications. actual sensed Temperature in applications Applications where the resistance error in long sensor Repair Information The A421 Electronic Temperature control can cable leads cause a deviation in the If the A421 Series Electronic Temperature be used to control a wide variety of displayed Temperature from the actual control fails to operate within its single-stage refrigeration or HVAC equipment. sensed Temperature . specifications, replace the unit.

4 For a adjustable anti-short cycle delay keeps the replacement A421 control , contact the Sample Temperature control applications output relay Off after the Off setpoint is nearest Authorized include: reached for a user-defined time delay, johnson Controls /PENN Distributer or Sales Temperature monitoring and alarming which helps avoid short cycling, hard starts, Representative. on/off control of boilers and chillers and nuisance overload outages on boiler and chiller pump control compressors and other inductive applications. heating and cooling control Temperature setback/offset control enables floating Temperature control of damper and the control to shift the On and Off setpoint valve actuators values by a user-defined offset when an cooling tower fan control based on water external switch closes the binary input Temperature control circuit. Using a switching timer supply, makeup, and mixed air Temperature enables you to set up occupied/unoccupied control Temperature setback schedules for your Temperature actuated valve control applications.

5 Supply and makeup air damper and fan high-impact, thermoplastic Type 1/IP20 or control Type 4X (NEMA)/IP66 watertight, condenser fan control based on condenser corrosion-resistant enclosures increase Temperature application options, allowing surface and snap-fit DIN rail mount, or watertight surface mount. 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. R 44. Single-Stage Electronic Temperature Controls A421 Series Electronic Temperature Controls (Continued). Selection Chart A421 Electronic Temperature control Selection Chart Product Code Description Number A421 ABC-02C Line-Voltage Type 1 Electronic Temperature control : Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications.

6 Rated for 120/240 VAC. Includes an A99BB-200C Temperature sensor with 6 ft 7-1/5 in. ( m) cable. A421 ABC-03C Line-Voltage Type 1 Electronic Temperature control : Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications. Rated for 120/240 VAC. Includes an A99BB-300C Temperature sensor with 9 ft 9 in. ( m) cable. A421 ABC-04C Line-Voltage Type 1 Electronic Temperature control : Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications. Rated for 120/240 VAC. Includes an A99BB-400C Temperature sensor with 13 ft 1-1/5 in. ( m) cable. A421 ABC-06C Line-Voltage Type 1 Electronic Temperature control : Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications. Rated for 120/240 VAC. Includes an A99BB-400C Temperature sensor with 19 ft 6 in. ( m) cable. A421 AEC-01C Line-Voltage Type 4X Electronic Temperature control : Type 4X (NEMA), IP67 weathertight enclosure for surface-mount applications.

7 Rated for 120/240 VAC. Includes an A99BB-25C Temperature sensor with 9-7/8 in. ( m) cable. A421 AEC-02C Line-Voltage Type 4X Electronic Temperature control : Type 4X (NEMA), IP67 weathertight enclosure for surface-mount applications. Rated for 120/240 VAC. Includes an A99BB-200C Temperature sensor with 6 ft 7-1/5 in. ( m) cable. A421 GBF-02C Low-Voltage Type 1 Electronic Temperature control : Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount applications. Rated for 24 VAC Class 2, Safety Extra Low Voltage. Includes an A99BB-200C Temperature sensor with 6 ft 7-1/5 in. ( m) cable. A421 GEF-01C Low-Voltage Type 4X Electronic Temperature control : Type 4X (NEMA), IP67 weathertight enclosure for surface-mount applications. Rated for 24 VAC Class 2, Safety Extra Low Voltage (SELV). Includes an A99BB-25C Temperature sensor with 9-7/8 in. ( m) cable. A421 GEF-02C Low-Voltage Type 4X Electronic Temperature control : Type 4X (NEMA), IP67 weathertight enclosure for surface-mount applications.

8 Rated for 24 VAC Class 2 (SELV). Includes an A99BB-200C Temperature sensor with 6 ft 7-1/5 in. ( m) cable. A99 Temperature Sensors Compatible with the A421 Control1. Product Code Description Number A99BA-200C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 6 ft 7-1/5 in. ( m) shielded PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BB-25C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 9-7/8 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BB-200C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 6 ft 7-1/5 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BB-300C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 9 ft 9-3/5 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BB-400C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 13 ft 1-1/5 in.

9 ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BB-600C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 19 ft 8-2/5 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99BC-25C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 9-7/8 in. ( m) high- Temperature silicon cable; Ambient operating Temperature range: -40 to 248 F (-40 to 100 C). A99BC-100C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 3 ft 3-3/5 in. ( m) high- Temperature silicon cable; Ambient operating Temperature range: -40 to 248 F (-40 to 120 C). A99BC-300C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 9 ft 9-3/5 in. ( m) high- Temperature silicon cable; Ambient operating Temperature range: -40 to 248 F (-40 to 120 C). A99BC-500C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 16 ft 4-4/5 in. ( m) high- Temperature silicon cable; Ambient operating Temperature range: -40 to 248 F (-40 to 120 C).

10 A99BC-1500C PTC Temperature Sensor: Standard probe 2 in. ( cm) with 49 ft 2-2/5 in. ( m) high- Temperature silicon cable; Ambient operating Temperature range: -40 to 248 F (-40 to 120 C). A99CB-200C PTC Temperature Sensor: Extended probe 6 in. ( cm) with 6 ft 7-1/5 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). A99CB-600C PTC Temperature Sensor: Extended probe 6 in. ( cm) with 19 ft 8-2/5 in. ( m) PVC cable;. Ambient operating Temperature range: -40 to 212 F (-40 to 100 C). 1. When any A99 Series Temperature Sensor is connected to a standard Temperature A421 control model, the range of usable values is -40 to 212 F. (-40 to 100 C). 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.