• 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 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 a Liquid Crystal Display (LCD) for viewing the temperature and status of other functions.
• Johnson Controls thermostats feature five 'lockout levels,' ranging from complete access to total control restriction. You might want to unlock your Johnson Controls thermostat before making changes to your climate control set up. Allow roughly five minutes for this task.

1. Johnson Controls Thermostat A419 Manual 2017
2. Johnson Controls Thermostat A419 Manual Parts
3. Johnson Controls Thermostat A419 Manual Instructions
4. Johnson Controls Thermostat A419 Manual Online

Johnson Controls A421ABC-02C - Single Stage Digital Temperature Control (120/240VAC SPDT) - Electronic Single Stage Temperature Control, 120/240 VAC, UL TYPE 1, IP20, SPDT, 2M (6'-6') Temperature Sensor.

Product/Technical Bulletin

A419

Issue Date

August 13, 2014

© 2014 Johnson Controls, Inc.

1

Code No. LIT-125188

www.johnsoncontrols.com

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

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

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

Johnson Controls Thermostat A419 Manual 2017



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

Function

Johnson Controls Thermostat A419 Manual Parts

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



Johnson Controls Thermostat A419 Manual Instructions

High-Impact, Thermoplastic NEMA 1 or

NEMA 4X Watertight, Corrosion-Resistant
Enclosures

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

• Application
• Operation Overview
• Adjustments
• Troubleshooting

Johnson Controls Thermostat A419 Manual Online