Replacing an A419 Control with an A421 Control: Terminal locations and labels - PENN Controls - A421ABC - A421AEC - A421GBF - A421GEF - Electronic Temperature Control - A421 Standard Model

A421 Series Standard Electronic Temperature Controls Installation Guide

Brand
PENN Controls
Product name
A421 Standard Model
Document type
Installation Guide
Part number
24-7664-3019
Document revision
G
Revision date
2022-08-25
Language
English

The A421 Series Electronic Temperature Controls are the next generation of the A419 Series Electronic Temperature Controls.

If you need to replace an A419 Control with an A421 Control, be sure to note that wiring terminals on the TB1 and TB2 terminal blocks on A421 Controls are in different positions and have different terminal labels from the wiring terminals on the A419 Controls. Table 1 provides a cross-reference for matching the terminal labels on A419 Controls to the terminal labels on A421 Controls.

Note: The low-voltage signal terminals on the TB3 terminal block are labeled the same on both A419 Controls and A421 Controls.

See Figure 2 for terminal block and terminal positions on the A421 Control.

Table 1. A419 and A421 wiring terminal labels
Terminal block A419 Terminal label A421 Terminal label
TB1

(24 VAC)

T1 LN
T2 24V
TB1

(120/240 VAC)

120 120V
240 240V
AC COM LN
TB2

(All Voltages)

C LC
NO LNO
NC LNC