User Guide

The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult the local Johnson Controls office.
Johnson Controls, Inc. shall not be liable for damages resulting from misapplication or misuse of its products. © 2009 Johnson Controls, Inc.
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A419 Series
Electronic Temperature Controls with NEMA 1 or NEMA 4X Watertight
Enclosures
Code No. LIT-1927385
Issued February 1, 2009
Description
The A419 series controls are single-stage,
electronic temperature controls with a Single
Pole, Double Throw 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
indicates the controls’ output relay (On/Off)
status. The A419 controls are available in
24 VAC or 120/240 VAC models.
The A419 controls have heating and cooling
modes, adjustable setpoint and differential, an
adjustable anti-short cycle delay, and a
temperature offset (setback) 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
surface-mount enclosures.
Features
• low- and line-voltage models provide
options for almost any refrigeration or
HVAC control-voltage application
• easy-to-read LCD displays the sensed
temperature and control-function status
clearly, and custom icons on the display
indicate the control and system status at a
glance
• 30° (F° or C°) temperature differential
adjustment range allows precise (1F° or C°)
temperature differential settings that are
much tighter 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, and helps avoid hard
starts, nuisance overload outages, and
unnecessary equipment wear
• Temperature Offset Function shifts the cut-
in and cut-out setpoints by an adjustable
offset when a user-installed, external switch
closes the A419 control’s binary input circuit
• high-impact thermoplastic type NEMA 1
allows surface or snap-fit DIN rail mount;
Noryl® high-impact thermoplastic type
NEMA 4X enclosures allow 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 to
deter unauthorized adjustment of the
control settings
Applications
The A419 can be used to control a wide variety
of single-stage refrigeration or HVAC
equipment. Typical applications include:
• freezer control in convenience stores
• reach-in coolers
• supermarket display cases for produce or
meats
• restaurant or convenience store walk-in
coolers
• boiler control
• compressor lockout (disables the
compressor when temperature exceeds
limits)
• condensor fan cycling
• pump control for cooling towers
• space and return air temperature
Selection Chart
A419 Series Electronic Temperature Control with NEMA 1 or NEMA 4X Watertight Enclosure
Code Number Item Lead Length Description
A419ABC-1C
1
1. A99 Sensor included with all models
Line Voltage, NEMA 1 Enclosure Electronic Temperature Control with Display
6-1/2 ft (2m)
Supply Voltage: 120 or 240 VAC
Range: -30 to 212°F (-34 to 100°C)
Differential: 1 to 30F° (1 to 30C°)
A419ABC-2C
1
Line Voltage, NEMA 1 Enclosure Electronic Temperature Control with Display
9-3/4 ft (3m)
A419ABC-3C
1
Line Voltage, NEMA 1 Enclosure Electronic Temperature Control with Display
13 ft (4m)
A419ABC-4C
1
Line Voltage, NEMA 1 Enclosure Electronic Temperature Control with Display
19-1/2 ft (5m)
A419AEC-1C
1
Line Voltage, NEMA 4X Enclosure Electronic Temperature Control with Display
9-3/4 in. (0.25m)
A419AEC-2C
1
Line Voltage, NEMA 4X Enclosure Electronic Temperature Control with Display
6-1/2 ft (2m)
A419GBF-1C
1
24 VAC, NEMA 1 Enclosure Electronic Temperature Control with Display
6-1/2 ft (2m)
Supply Voltage: 24 VAC, Class 2
Range: -30 to 212°F (-34 to 100°C)
Differential: 1 to 30F° (1 to 30C°)
A419GEF-1C
1
24 VAC, NEMA 4X Enclosure Electronic Temperature Control with Display
9-3/4 in. (0.25m)
A419 Control and Sensor