Technical specifications - PENN Controls - A421ABG - A421ABJ - A421AEJ - Electronic Temperature Control - A421 Standard Model

A421 Series Standard Electronic Temperature Controls with Power Cords Installation Guide

Product name
A421 Standard Model
Document type
Installation Guide
Document revision
Revision date
Table 1. A421 Series Electronic Temperature Controls with power cords Technical Specifications
Specification Description
Power consumption 1.8 VA maximum
Supply power 110/120 VAC, 50/60 Hz
Ambient conditions Operating: Type 1 models: -40°F to 150°F (-40°C to 66°C), 0% to 95% RH noncondensing

Type 4X models: -40°F to 140°F (-40°C to 60°C), 0% to 95% RH noncondensing

Shipping and storage: All models: -40°F to 185°F (-40°C to 85°C), 0% to 95% RH noncondensing

Temperature control range -40°F to 212°F or -40°C to 100°C
Input signal 1,035 ohm at 77°F (25°C) for A99 PTC temperature sensors
Sensor offset range ±5ºF or ±3ºC
Enclosure material Type 1, IP20 high-impact thermoplastic or

Type 4X, IP66 watertight, corrosion-resistant, high-impact thermoplastic

Note that on the type 4x enclosures, the cover screws must be torqued to 10 to 12 in·lb (1.1 N·m to 1.4 N·m) to achieve type 4X rating.

Compliance North America: cULus Listed; UL 60730, File E27734, Vol. 1; FCC Compliant to CFR47, Part 15, Subpart B, Class B

Industry Canada (IC) Compliant to Canadian ICES-003, Class B limits

Table 2. A421 Temperature Control with power cords output relay contacts electrical ratings
Agency and file UL 60730
Applied AC voltage at 50/60 Hz 120 VAC
Full load amperes LC/LNO 12 A
Locked rotor amperes LC/LNO 72 A
Resistive amperes LC/LNO 10 A
Pilot duty VA LC/LNO 125 VA
Table 3. UL conformity declaration information
Information Description
Purpose of control Sensing control / operating control
Construction of control Electronic free-standing control, in-line cord control
Number of cycles 30,000 cycles
Method of mounting control Mounting screws or DIN rail
Method of providing earthing Attachment plug
Type of cord connection Type Y
Type 1 or type 2 action Type 1.B (Micro-disconnection)
External pollution situation All models: A421 [ ] B: Pollution degree 3

All models: A421 [ ] E: Pollution degree 4

Internal pollution situation Pollution degree 2
Heat and fire resistance category D
Rated impulse voltage 4,000 V
Ball pressure temperature 128°C
Cover screw torque requirements instruction All models: A421 [ ] E: To maintain type 4X / IP66 rating, tighten enclosure screws to: 10–12 in·lb
Table 4. A99B Series Positive Temperature Coefficient Sensors Technical Specifications
Specification Description
Sensing range1 Type A99BA and A99BB: -40°F to 212°F (-40°C to 100°C)

Type A99BC: -40°F to 248°F (-40°C to 120°C)

Reference resistance 1,035 ohms at 77°F (25°C) and 855 ohms at 32°F (0°C)
Accuracy 0.9°F (0.5°C) between 5°F and 167°F (-15°C and 57°C). Refer to the A99B Series Temperature Sensors Product/Technical Bulletin (LIT-125186) for accuracy outside of this temperature range.
Sensor construction Probe: Stainless steel
Sensor cable sheath Type A99BA: Shielded PVC cable

Type A99BB: PVC cable

Type A99BC: High temperature silicon cable

Wire gauge 22 AWG
Ambient operating conditions Type A99BA and A99BB: -40°F to 212°F (-40°C to 100°C); 0% to 100% RH, condensing

Type A99BC: -40°F to 248°F (-40°C to 120°C); 0% to 100% RH, condensing

Ambient storage conditions Type A99BA and A99BB: -40°F to 221°F (-40°C to 105°C); 0% to 100% RH, condensing

Type A99BC: -40°F to 266°F (-40°C to 130°C); 0% to 100% RH, condensing

Shipping weight 1.4 oz (41 g) for 6 1/2 ft (2 m) sensor
Accessories See Table 3

The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.

1 When any A99 Series Temperature Sensor is connected to a standard A421 Control model, the range of displayed temperature values is restricted to -40ºF to 212ºF or -40ºC to 100ºC.