Ordering information
See Table 5 to order a standard A421 Series Electronic Temperature Control. See Table 6 and Table 7
for more information about A99 sensors, mounting hardware, and other accessories used to install
A421 Controls. Contact your nearest Johnson Controls or PENN distributor or sales representative to
order these products.
Table 5: A421 Series Electronic Temperature Controls with Off-Cycle Defrost Timer selection
chart
Product type Description
A421ABD-02C Line-voltage Type 1 Electronic Temperature Control with Off-Cycle Defrost
Timer: Type 1 (NEMA), IP20 standard enclosure for DIN rail and surface-mount
applications. Rated for 120/240 VAC. Includes timer for On/Off defrost cycle
control. Includes an A99BB-200C temperature sensor with 6.6 ft (2.0 m) cable.
A421AED-01C Line-voltage Type 4X Electronic Temperature Control with Off-Cycle Defrost Timer:
Type 4X (NEMA), IP66 watertight enclosure for surface-mount applications. Rated
for 120/240 VAC. Includes timer for On/Off defrost cycle control. Includes an
A99BB-25C temperature sensor with 9 7/8 in. (0.25 m) cable.
A421AED-02C Line-voltage Type 4X Electronic Temperature Control with Off-Cycle Defrost Timer:
Type 4X (NEMA), IP66 watertight enclosure for surface-mount applications. Rated
for 120/240 VAC. Includes timer for On/Off defrost cycle control. Includes an
A99BB-200C temperature sensor with 6.6 ft (2.0 m) cable.
Table 6: A99 Temperature Sensors selection chart
1
Product code Description
A99BA-200C Positive temperature coefficient (PTC) Temperature Sensor: Standard probe 2
in. (5.1 cm) with 6.6 ft (2.0 m) shielded polyvinyl chloride (PVC) cable; ambient
operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BB-25C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 9 7/8 in. (0.25 m) PVC
cable; ambient operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BB-200C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 6.6 ft (2.0 m) PVC
cable; ambient operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BB-300C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 9.8 ft (3.0 m) PVC
cable; ambient operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BB-400C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 13.1 ft (4.0 m) PVC
cable; ambient operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BB-600C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 19.7 ft (6.0 m) PVC
cable; ambient operating temperature range: -40ºF to 212ºF (-40ºC to 100ºC)
A99BC-25C
11
PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 9 7/8 in. (0.25 m)
high-temperature silicon cable; ambient operating temperature range: -40ºF to
248ºF (-40ºC to 100ºC)
A99BC-100C
1
PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 3.3 ft (1.0 m) high-
temperature silicon cable; ambient operating temperature range: -40ºF to 248ºF
(-40ºC to 120ºC)
A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide24
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