Johnson Controls A419 Series User Manual

Johnson Controls Conditioners

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Product/Technical Bulletin


Issue Date

August 13, 2014

© 2014 Johnson Controls, Inc.


Code No. LIT-125188

A419 Series Electronic Temperature Controls with Display

and NEMA 1 or NEMA 4X Watertight Enclosures

The A419 series controls are single-stage, electronic
temperature controls with a Single-Pole, Double-Throw
(SPDT) output relay. They feature a lockable
front-panel touchpad for setup and adjustment, and an
LCD for viewing the temperature and status of other
functions. An LED indicates the controls’ output relay
On/Off status. The A419 controls are available in 24
VAC or 120/240 VAC powered models.

The A419 controls have heating and cooling modes,
adjustable setpoint and differential, an adjustable
anti-short cycle delay, and a temperature offset
function. The setpoint range is -30 to 212°F
(-34 to 100°C). The controls feature remote sensing
capability and interchangeable sensors. The
A419 controls are available in either NEMA 1,
high-impact plastic enclosure suitable for surface or
DIN rail mounting or NEMA 4X watertight,
corrosion-resistant surface-mount enclosures.

Figure 1: A419 Temperature Control with NEMA 1

Enclosure and A99 Temperature Sensor

Features and Benefits

Easy-to-Read Front-Panel

Liquid Crystal Display

Displays the sensed temperature and control-function
status clearly; custom icons on the display indicate the
control and system status at a glance

Wide Temperature Differential Adjustment

Range (1 to 30F° or C°)

Allows the user to set a precise (1F° or C°) temperature
differential from 1 to 30F° or C°; providing a much
tighter differential than electromechanical controls

Adjustable Anti-Short Cycle Delay

(0 to 12 Minutes in 1-Minute Increments)

Ensures that the output relay remains off for a user-set
time delay, which helps avoid hard starts, nuisance
overload outages, and unnecessary equipment wear

Switch-Activated Temperature Offset


Allows the user to shift the cut-in and cutout setpoints
by an adjustable offset based on the status of a
user-installed, external switch, such as a time clock

High-Impact, Thermoplastic NEMA 1 or

NEMA 4X Watertight, Corrosion-Resistant

Increase application options, allowing surface and
snap-fit DIN rail mount, or Watertight surface mount

Lockable Front Panel Touchpad

Allows easy set up and adjustment of the A419 control
setpoint, differential, and other functions; a concealed
jumper locks the touchpad, and deters unauthorized
adjustment of the control settings

Low- and Line-Voltage Models

Provide options for most refrigeration and HVAC
control-voltage applications