Product/Technical Bulletin
A419
Issue Date
February 10, 2003
© 2003 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 a
Liquid Crystal Display (LCD) for viewing the
temperature and status of other functions. A
Light-Emitting Diode (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
Function
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
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
