A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Instructions
16
e. Check the control settings for proper values.
f. Press MENU until On appears. Press MENU
again to display the On value.
g. Press and to change the On temperature
above and below the sensor temperature until
the relay energizes and de-energizes.
Note: If the anti-short cycle delay is set to a value
other than 0 minutes, when the control is powered On,
the relay does not energize until the time delay has
elapsed.
h. If the output relay does not perform as
expected, replace the A421 control.
i. If proper operation of the A421 control is
verified, reconnect the load and consult the
equipment manufacturer’s instructions for
troubleshooting the controlled equipment.
Repair Information
Do not attempt to repair or recalibrate the A421
temperature control. In case of a defective or
improperly functioning control, contact your nearest
Authorized Johnson Controls/PENN Distributor or
Sales Representative.
When contacting your Johnson Controls/PENN
Distributor, have the model number of the control
available. This number can be found on the label inside
the cover of the control.
Ordering Information
See Table 5 to order a standard A421 Series Electronic
Temperature Control. See Table 6 and Table 7 to order
A99 sensors, mounting hardware, and other
accessories used to install A421 controls. Contact your
nearest Johnson Controls/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
(Part 1 of 2)
Product Code Description
A99BA-200C PTC Temperature Sensor: Standard probe 2 in. (5.1 cm) with 6.6 ft (2.0 m) shielded PVC cable;
Ambient operating temperature range: -40 to 212ºF (-40 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: -40 to 212ºF (-40 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: -40 to 212ºF (-40 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: -40 to 212ºF (-40 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: -40 to 212ºF (-40 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: -40 to 212ºF (-40 to 100ºC)
A99BC-25C
1
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: -40 to 248ºF (-40 to 100ºC)
To Next Page
Loading...
Need help?
General
