Product Overview

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.
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R–46
A421 Series Electronic Temperature Controls (Continued)
Single-Stage Electronic Temperature Controls
Technical Specifications
Accessories for the A421 Controls
Product Code
Number
Description
BKT287-1R 12 in. (305 mm) long DIN rail section
BKT287-2R 36 in. (914 mm) long DIN rail section
PLT344-1R Two End Clamps for DIN rail sections
A99-CLP-1 Surface Mounting Clip for A99B and A99C Series Temperature Sensors
SHL10-603R Sun Shield for A99B and A99C Series Temperature Sensors
BOX10A-603R PVC Enclosure for A99B and A99C Series Temperature Sensors
WEL11A-601R Immersion well for applying sensor in fluid applications
A421 Series Electronic Temperature Controls
Power Consumption 1.8 VA maximum
Supply Power Low Voltage Models: 24 VAC (20 to 30 VAC), 50/60 Hz, Class 2 or Safety Extra-Low Voltage
Line Voltage Models: 110/120 or 208/230/240 VAC, 50/60 Hz
Ambient Conditions Operating: Type 1 Models: -40 to 150°F (-40 to 66°C), 0 to 95% RH Noncondensing
Type 4X Models: -40 to 140°F (-40 to 60°C), 0 to 95% RH Noncondensing
Shipping and Storage: -40 to 185°F (-40 to 85°C), 0 to 95% RH Noncondensing
Temperature Control Range -40 to 212°F (-40 to 100°C)
Input Signal 1,035 ohm at 77F (25C) for A99 PTC temperature sensors
Sensor Offset Range ±5ºF or ±3ºC
Output Relay Contacts Electrical
Ratings
24 VAC models:
100 VA, 30 VAC maximum, Class 2
120/240 VAC models:
Applied Voltage: 24 VAC 120 VAC 208 VAC 240 VAC
Horsepower N.O. (N.C.): -- 1 (0.25) hp 1 (0.33) hp 1 (0.5) hp
Full Load Amperes N.O. (N.C.): -- 16 (5.8) A 9.2 (4.0) A 8.0 (4.9) A
Locked Rotor Amperes N.O. (N.C.): -- 96 (34.8) A 55.2 (24) A 48 (29.4) A
Resistive Amperes N.O. (N.C.): 15 (10) A 15 (10) A 10 (10) A 10 (10) A
Pilot Duty N.O. (N.C.): 125 (50) VA 125 (125) VA 125 (125) VA 125 (125) VA
Enclosure Material Type 1/IP20 high-impact thermoplastic or Type 4X/IP66 watertight, corrosion-resistant, high-impact thermoplastic
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
Europe: CE Mark – Johnson Controls, Inc. declares that this product is in compliance with the essential requirements and
other relevant provisions of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC.
Australia: Regulatory Compliance Mark (RCM)