Technical specifications - PENN Controls - LIT-1900935 - A421ABD - A421AED - Electronic Temperature Control - A421 Off‐Cycle Defrost Model

A421 Series Electronic Temperature Controls with Off-Cycle Defrost Catalog Page

PENN Controls
Product name
A421 Off‐Cycle Defrost Model
Document type
Catalog Page
Document number
Revision date
Table 1. A421 Series Electronic Temperature Control Technical Specifications
Specification Description
Power consumption 1.8 VA maximum
Supply power Class 2: 108/110/115/120 or 208/230/240 VAC, 50/60 Hz
Ambient conditions

Type 1/IP20:

Operating: -40°F to 150°F (-40°C to 66°C), 0% to 95% RH noncondensing

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

Type 4X/IP66:

Operating: -40°F to 140°F (-40°C to 60°C)

Shipping and storage: -40°F to 140°F (-40°C to 60°C)

Temperature control range -40°F to 212°F or (-40°C to 100°C)
Sensor type A99 PTC temperature sensor, 1,035 ohm at 77°F (25°C)
Sensor offset range ±5ºF or ±3ºC
Enclosure material

Type 1: IP20 high-impact thermoplastic or

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


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 declares that this product is in compliance with the essential requirements and other relevant provisions of the EMC Directive; Low Voltage Directive.


Australia: Regulatory Compliant Mark (RCM)

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.