Product/Technical Bulletin A419
Issue Date April 4, 2008
®
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
Wide Temperature Differential Adjustment
Range (1 to 30F° or C°)
Adjustable Anti-Short Cycle Delay
(0 to 12 Minutes in 1-Minute Increments)
Switch-Activated Temperature Offset
Function
High-Impact, Thermoplastic NEMA 1 or
NEMA 4X Watertight, Corrosion-Resistant
Enclosures
Displays the sensed temperature and control-function
status clearly; custom icons on the display indicate the
control and system status at a glance
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
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
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
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
© 2008 Johnson Controls, Inc. 1
Code No. LIT-125188 www.johnsoncontrols.com
Application
IMPORTANT: The A419 Series Temperature
Controls are intended to control equipment under
normal operating conditions. Where failure or
malfunction of an A419 Series Control could lead to
an abnormal operating condition that could cause
personal injury or damage to the equipment or other
property, other devices (limit or safety controls) or
systems (alarm or supervisory) intended to warn of
or protect against failure or malfunction of the A419
Series Control must be incorporated into and
maintained as part of the control system.
The A419 Electronic Temperature Control can be used
to control a wide variety of single-stage refrigeration or
Heating Ventilating, and Air Conditioning (HVAC)
equipment. Typical applications include:
• retail store display freezers and reach-in coolers
• supermarket display cases for produce/meats
• retail store walk-in coolers and freezers
• boiler operating control (used as a thermostat)
• condenser fan cycling or staging
• cooling tower pump and fan control
• space and return air temperature control
FCC Compliance
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference,
and (2) this device must accept any interference that
may cause undesired operation.
Dimensions
7/16
2
6-5/8
(168)
2-3/8
(61)
6-1/8
(155)
1-3/4
(44)
7/8
(22)
7/8
(22)
9/64
(3.7)
1/2
(13)
2-15/16
(75)
1-9/16
(40)
(6)
1/4
DIN
Rail
(11)
Sensor
(50)
Figure 2: A419 Temperature Control with
NEMA 1 Enclosure, Dimensions, in./(mm)
2-1/4
(56)
A419
MENU
MENU
2-3/8
(61)
(1/2 in. Trade Size)
Conduit Hole
1-1/16
(27)
(127)
4
(102)
2-3/8
(61)
5
This equipment has been tested and found to comply
with the limits for a Class A digital device pursuant to
Part 15 of FCC rules. These limits are designed to
provide reasonable protection against harmful
interference when this equipment is operated in a
commercial environment. This equipment generates,
2-13/16
(71)
Position t he A99 sensor
in the bracket at the bot tom of
the A419 NEMA 4X enclosure.
2-13/16
(71)
uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the
instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in
a residential area is likely to cause harmful
interference, in which case the user will be required to
Figure 3: A419 Temperature Control with
NEMA 4X Watertight, Corrosion-resistant,
Enclosure, Dimensions, in./(mm)
correct the interference at his or her own expense.
Canadian Compliance Statement
This digital apparatus does not exceed the Class A
limits for radio noise emissions from digital apparatus
set out in the Radio Interference Regulations of the
Canadian Department of Communications.
2 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
Liquid Crystal Display
During normal operation, the LCD displays the
temperature at the sensor, the units of temperature
(°F or °C), and an icon indicating if the control is set for
Heating (
) or Cooling ( ) mode. The LCD also
displays BIN if the Temperature Offset function is
activated. See
Figure 5.
During control set up or adjustment, the LCD displays
the control functions and their values (settings). After
30 seconds of inactivity, the display returns to the
sensed-temperature display. See the Adjustments
section to adjust the control setting.
Output Relay Status Indicator LED
A green LED on the control’s front panel illuminates
when the SPDT output relay is energized and the
Normally Open (N.O.) contacts are closed.
Figure 5.
See
Figure 4: A419 Temperature Control with NEMA 4X
Enclosure and A99 Temperature Sensor
Operation Overview
The A419 control’s front-panel, LCD, LED, and the
A419 control functions are described below. See the
Adjustments section for instructions on setting up and
adjusting the A419 control.
A419 Control Front-Panel
The front panel of the A419 control has a three-button
touchpad and LCD for adjusting control function
values, and an LED indicator that displays the On/Off
status of the SPDT output relay. See
BIN
F
MENU
Figure 5: A419 Control Front-Panel with Display
Figure 5.
Temperature
Offset Indicator
Temperature
Units Indi cator
Operating Mode
Indicator
Liquid Crystal
Display
MENU
Button
DOWN
Arrow
Button
UP
Arrow
Button
Output Relay
Status Indicator
LED
A419 Control Definitions
Cut-in is the temperature at which the N.O. contacts
on the SPDT output relay close.
Cutout is the temperature at which the N.O contacts
on the SPDT output relay open.
A419 Functions Set at the Front-Panel
Setpoint (SP) establishes the temperature value that
energizes or de-energizes the output relay, depending o n
the user selected mode of operation. The control may be
set either to cut in or to cut out at Setpoint. See the
Cooling/Heating and Setpoint Mod es. The Setpoint range
is -30 to 212°F (-34 to 100°C).
If Setpoint mode is Cut-in, Setpoint is the temperature
value that closes the N.O. contacts. If Setpoint mode is
Cutout, Setpoint is the temperature value that opens
the N.O. contacts. See
Figure 7 and Figure 8.
Differential (dIF) establishes the difference in
temperature (in F° or C°) between the cut-in and
cutout values. The differential is set relative to Setpoint
and may be set from 1 to 30F° or C°. See
Figure 7 and
Figure 8.
Anti-Short Cycle Delay (ASd) establishes the
minimum time that the N.O. contacts remains open (after
reaching cutout) before closing again. The delay overrid es
any Load Demand and does not allow the N.O. contacts
to close until the set time-delay value has elapsed. See
Figure 6. When the delay is activated, the LCD
alternately flashes the sensor temperature and ASd. The
delay may be set for 0 to 12 minutes in 1-minute
increments.
A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 3
For example, if the anti-short cycle delay is set for
7 minutes, the A419 control will not restart the
equipment for 7 minutes after the equipment has cut
out, even if the cut-in temperature value is reached
during the delay. If the temperature reaches the cut-in
value during the delay period, the display flashes
between the sensed temperature and ASd, indicating
that the next On-cycle is being delayed. After the set
delay time has elapsed, the A419 control returns to
normal operation, restarts the equipment (if cut-in has
been reached), ASd stops flashing, and the LCD
reverts to the normal operating display.
Note:
Any interruption in supply power to the
A419 control activates the anti-short cycle delay.
Time
Off
Off
On
On
Anti-short
Cycle Delay
Load Dem and
Overridden
Load De m and
Output Status
Figure 6: Anti-short Cycle Delay
Sensor Failure Operation (SF) establishes how the
A419 control operates the equipment in the event of a
sensor or sensor-wiring failure. The A419 control may
be set to run the equipment continuously or to shut it
down if the sensor or sensor wire fails. When a failure
is detected the LCD flashes SF alternately with OP if
the sensor circuit is open, or SF and SH if the sensor
circuit is shorted. The control implements a 1-minute
delay before initiating a failure response to allow for
verification of the failure condition and to avoid
nuisance failure indications.
Temperature Units establishes the units of
temperature (F° or C°) displayed on the LCD.
Temperature Offset (OFS) establishes the value of
setpoint-shift (in F° or C°) applied to Setpoint (and
Differential) when a (user-installed) circuit is closed
between the binary input (BIN) and common (COM)
terminals. The offset value may be set from 0 to 50F°
or C°.
The Temperature Offset function is used to reset the
Heating Setpoint to a lower temperature (secondary)
setpoint or reset the Cooling Setpoint to a higher
temperature (secondary) setpoint by the temperature
value set in Temperature Offset.
The BIN and COM terminals may be connected to a
(user-supplied) external switching device, such as a
time clock, that has a set of Single-Pole, Single-Throw
(SPST) contacts. Closing a circuit between the BIN
and COM terminals activates the Temperature Offset.
See Wiring.
This function enables the control to alternate between
two temperature setpoints based on the position of the
binary input switch. The difference between the
primary and secondary setpoints (in F° or C°) is set in
the Temperature Offset function (OFS) using the
touchpad. See Setting Other Functions.
Table 1 shows an example of Temperature Offset.
Table 1: Temperature Offset Example
Mode of
Operation
Cooling
Heating
* Setpoint when circuit between binary input terminals
(BIN and COM) is closed
Setpoint
70° 8° 78°
70° 8° 62°
Temperature
Offset Value
Secondary
Setpoint*
When the circuit is closed between the binary input
(BIN) common (COM) terminals, the offset function is
enabled and the A419 control cycles on the secondary
setpoints. BIN is displayed on the LCD above the °F or
°C symbol when the offset is enabled. See
Figure 5.
A419 Control Functions Set by Jumper Position
For instructions on positioning jumpers, see
Positioning the Jumpers in the Adjustments section.
Refer to
Figure 12 and Figure 13.
Touchpad Lock: The jumper at P5 establishes
whether the touchpad is locked or unlocked. Locking
the touchpad deters accidental or unauthorized
changes to all of the function parameters.
Heating/Cooling Mode is established by positioning
the jumper on the top two pins of the P4 jumper. See
Figure 13.
Setpoint Mode: Removing or installing the lower
jumper at P4 establishes whether Setpoint is the cut-in
temperature or cutout temperature. See
Figure 13.
Cooling/Heating and Setpoint Modes
The A419 control may be in four operating modes:
Cooling/Cut-in, Cooling/Cutout, Heating/Cut-in, and
Heating/Cutout. Position the jumpers located on the
circuit board under the A419 control cover to set the
desired mode of operation. See Positioning the
Jumpers.
In Cooling/Cut-in mode the differential is below
Setpoint. The output relay energizes and the LED
illuminates when the temperature rises to Setpoint.
When the temperature drops to Setpoint minus the
differential value, the relay and LED de-energize.
4 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
In Cooling/Cutout mode the differential is above
Setpoint. The output relay energizes and LED
illuminates when the temperature rises to Setpoint plus
the differential value. When the temperature drops to
Setpoint, the relay and LED de-energize.
Temperature
(+)
Setpoint
(-)
Cooling/Cut-out
Cut-in
(On)
Differential
Cut-out
(Off)
Cut-in
(On)
Cooling/Cut-in
Differential
Cut-out
(Off)
Figure 7: Cooling Modes
When the Heating/Cut-in mode is selected, the
differential is above Setpoint. The output relay
energizes and LED indicator illuminates when the
temperature drops to Setpoint. When the temperature
rises to Setpoint plus the differential value, the output
relay and LED de-energize.
When Heating/Cutout mode is selected, the
differential is below Setpoint. The output relay
energizes and LED indicator illuminates when the
temperature drops to Setpoint minus the differential
value. When the temperature rises to Setpoint, the
output relay and LED indicator de-energize.
Temperature
(+)
Heating/Cut-out
Setpoint
Differential
Cut-in
(On)
Cut-out
(Off)
Heating/Cut-in
Cut-out
(Off)
Differential
Mounting
An A419 control has either a standard high-impact
plastic NEMA 1 or a NEMA 4X corrosion-resistant,
watertight enclosure.
The A419 control is not position sensitive but should
be mounted for convenient wiring and adjustment.
Note: When mounting the control to rigid conduit,
attach the hub to the conduit before securing the hub
to the control enclosure.
The mounting hole pattern of the NEMA 1 enclosure is
identical to that of the System 350™ controls, and most
models of the A19 control. The NEMA 1 enclosure
may also be mounted on 35 mm DIN rail. See
Figure 2.
and
The NEMA 4X models may be mounted to flat vertical
surfaces using the four screw holes at the enclosure
corners. See
Figure 3 and Figure 4. To maintain the
watertight and corrosion resistant integrity of the
NEMA 4X enclosure, use a conduit fitting rated for the
environment in which the control is installed.
An additional (low-voltage) two-wire cable is required
to operate the temperature offset function. On
NEMA 4X enclosures you must install a suitable
liquid-tight fitting in an available knockout to pass the
two-wire cable through the enclosure wall.
IMPORTANT: The short-lead A99 sensor,
included with A419 NEMA 4X model controls, must
be mounted on the bottom of the control in the
bracket molded on the NEMA 4X housing. Mounting
the sensor on top of the control may reduce the
accuracy of the displayed temperature. See Figure 3
and Figure 4 for proper sensor position.
Figure 1
Cut-in
(-)
(On)
Figure 8: Heating Modes
A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 5
Wiring
!
WARNING: Risk of Electrical Shock.
To avoid the risk of electrical shock, disconnect all
power sources to the control before wiring any
connections. More than one disconnect may be
required to completely de-energize the control and
equipment.
IMPORTANT: All wiring must conform to local,
national, and regional regulations. Use copper
conductors only for all wire connections. Do not
exceed the electrical ratings for the A419 control or
the equipment it is wired to.
Refer to Figure 9, Figure 10, and Figure 11 for typical
examples of wiring an A419 control to the controlled
equipment.
Use wire no larger than 12 AWG when connecting to
the two lower terminal blocks (TB1 and TB2).
Note: Terminal block TB2 is an isolated SPDT
switch (dry contacts). The TB2 terminals have no
internal electrical connection to the A419 control.
Use wire no larger than 16 AWG when connecting to
the upper sensor terminal block (TB3).
Wire insulation rating must be 90°C, minimum.
A99 temperature sensors are not polarity sensitive.
Wire the leads to (+) SEN and (-) COM on the sensor
terminal block (TB3). See
Figure 11.
Keep the leads between the control and sensor as
short as possible/practical in your application. The
additional resistance in long sensor leads creates error
between the actual temperature and the displayed
temperature. Refer to
leads.
Temperature sensor signals may be affected by
electrical interference. When extending sensor cable
beyond 50 ft (15.2 m) use a twisted-pair, shielded
cable to reduce electrical interference.
If the Temperature Offset function is used, wire a
switch (such as a switching time clock) between the
binary input terminal (BIN) and the common terminal
(COM). See
Figure 9, Figure 10, and Figure 11 for
terminal strip location.
Figure 9, Figure 10, and
Table 1 when extending sensor
(Optional)
Binary Input
Switch
Cable
Shield
(if used)
Sensor
24 VAC
Class 2
Transformer
TB3
TB1
A99
(+)
(–)
(+)
T1
T2
A419GBF-1
A419GEF-1
BIN
COM
SEN
TB2
NCCNO
24 VAC
Figure 9: Wiring the 24 VAC A419 Control
(Optional)
Binary Input
Switch
Cable
Shield
(if used)
A99
Sensor
120 VAC
Neutral
TB3
TB1
240
(+)
(–)
(+)
120
AC COM
A419ABC-1
A419AEC-1
BIN
COM
SEN
TB2
NC
120 VAC
Figure 10: Wiring the 120 VAC A419 Control
(Optional)
Binary Input
Switch
Cable
Shield
(if used)
A99
Sensor
240
VAC
TB3
TB1
240
L1
L2
(+)
(–)
(+)
120
AC COM
A419ABC-1
A419AEC-1
BIN
COM
SEN
TB2
NCCNO
240 VAC
Load
C
Load
Load
NO
Figure 11: Wiring the 240 VAC A419 Control
6 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
Adjustments
This section provides instructions for setting up and
adjusting the A419 controls using the jumpers and
touchpad.
Positioning the Jumpers
The P5 Jumper Pin Block has a single set of jumper
pins and is used to lock or unlock the touchpad. The
P4 Jumper Pin Block has two sets of jumper pins.
The top set of pins at P4, labeled JUMP1, is used to
set the control for Heating or Cooling mode. The
bottom set of pins, labeled JUMP2, is used to establish
Setpoint at cut-in or at cutout. See
To position a jumper in the Installed position, place the
jumper on both pins. To position a jumper in the
Removed position, place the jumper on only one pin.
(Save the jumper in case it is required in the future.)
Figure 12.
See
Figure 12.
=
Jumper
(Jumper Positioned on Both Pins)
Pins
(Jumper Positioned on One Pin)
Figure 12: Positioning the Jumpers
Touchpad
Locked
Touchpad
Unlocked
Installed
=
Removed
Heating Mode
Cut-in at Setp oint
Position the jumpers as follows. Refer to
Figure 13, and Table 2.
Verify that all power sources to the A419 control
1.
have been disconnected.
Remove the control’s cover by loosening the four
2.
captive cover screws.
3.
Position the jumpers to set Cooling/Heating,
Figure 12,
P5
JUMP1
JUMP2
Cooling Mode
Cut-in at Setpoint
P4
Heating Mode
(Standard)
Cut-out at Setpoint
Setpoint, and Touchpad Lock functions.
4.
Replace the cover and fasten in place with the
four screws.
5.
Restore power to the control.
Figure 13: Jumper Positions and Control Settings
Cooling Mode
(Standard)
Cut-out at Setpoint
IMPORTANT: Verify that the Cooling/Heating
jumper is positioned properly before powering the
A419 control, to ensure that the relay operates as
intended. See Figure 13 and Table 2.
Table 2: Jumper Designations, Jumper Positions and Control Settings
Function
Operating Mode
Cooling/Heating
Setpoint
Touchpad Lock P5-Touchpad Unlock
Note: The touchpad cannot be unlocked without a jumper. Do not discard any jumpers in case they are required in the
future.
Jumper Pins Designation
on Control
JUMP1
(Top Pair of Pins on Block P4)
JUMP2
(Bottom Pair of Pins on Block P4)
Setting
Cooling Removed
Heating Installed
At Cut-in Removed
At Cut-out Installed
Locked Removed
Unlocked Installed
Jumper
Position*
Factory Default Setting
(and Jumper Position)
Cooling
(Removed position)
Cut-in
(Removed Position)
Unlocked
(Installed Position)
A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 7
Changing Temperature Units
The A419 control is set at the factory to display in
Fahrenheit temperature units.
To convert to Celsius units,
press the Up and Down buttons
simultaneously. Press them
again to return to Fahrenheit
units.
Notes: Make sure the Touchpad Lock jumper is in the
unlocked (installed) position before adjusting the
control. See
Figure 13.
Verify that the A419 control is displaying the desired
temperature units (F° or C°) before establishing the
setpoint value.
Setting the Setpoint
To view and adjust the temperature setpoint, follow
these steps and refer to
Table 3:
1. Press and hold the MENU button
until the display changes to flashing
SP. This will take about 2 seconds.
2. Press the MENU button again.
The current setpoint is displayed.
3. Press the Up or Down button to
adjust the setpoint temperature.
4. Press the MENU button to save.
The display then returns to the sensor
temperature.
Notes: If no entries are made for 30 seconds while
programming is in progress, the control reverts to the
normal temperature display.
If the MENU button is not pressed after changing the
setpoint value, the new value is not saved and the
A419 control reverts to the previously saved setpoint
value.
Table 3: Function Ranges and Settings
Function Range
SP: Setpoint
dIF: Differential
ASd: Anti-short
Cycle Delay
OFS: Temperature
Offset
SF:Sensor Failure
Operation
-30 to 212°F
(-34 to 100°C)
1 to 30° (F or C) 5
0 to 12 minutes 1
0 to 50° (F or C) 0
0 = output
de-energized
1 = output
energized
Factory
Setting
30
1
Operation at Extremes: If the combination of setpoint
plus or minus the differential falls outside the
temperature range (-30 to 212°F [-34° to 100°C]), the
A419 control operates as follows:
Cooling/Cut-in: If the control is operating in
Cooling/Cut-in mode and setpoint minus differential is
less than -30°F, the control switches on at setpoint
and off when the temperature drops below -30°F
(-34°C).
Heating/Cut-in: If the control is operating in
Heating/Cut-in mode and setpoint plus differential is
greater than 212°F (100°C), the control switches on at
setpoint and off when the temperature exceeds 212°F
(100°C).
Cooling/Cutout: If the control is operating in
Cooling/Cutout mode and setpoint plus differential is
greater than 212°F (100°C), the control switches on
when the temperature exceeds 212°F (100°C) and off
at setpoint.
Heating/Cutout: If the control is operating in
Heating/Cutout mode and setpoint minus differential is
less than -30°F (-34°C), the control switches on when
the temperature drops below -30°F (-34°C) and off at
setpoint.
Any saved A419 control setting values are
non-volatile and remain in the control’s memory
during power interruptions.
8 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
Setting Other Functions
To set the Differential (dIF), Anti-short Cycle Delay
(ASd), Temperature Offset (OFS), or Sensor Failure
(SF) operation, use the method illustrated and outlined
below.
Figure 14 illustrates the order of functions shown using
the Up or Down button. The Up button accesses
functions in the clockwise direction; the Down button
accesses functions in the counterclockwise direction.
Refer to
Table 3 for function ranges and factory
settings.
Up
Button
SP
dI F
Down
Button
SF
ASd
OFS
Figure 14: Order of the Functions
1. Press and hold the MENU button
until the display changes to
flashing SP. This will take about 2
seconds.
2. Press the Up or Down button
repeatedly until the desired
function is displayed.
See Table 3.
3. Press the MENU button to display
the function’s current value.
4. Press the Up or Down button
until the desired value is
displayed.
5. Press the MENU button to save
the new value. The display then
returns to the sensor temperature.
Notes: If no entries are made for 30 seconds while
programming is in progress, the control reverts to the
normal temperature display.
Checkout
Before applying power, make sure installation and
wiring connections are according to job specifications.
After necessary adjustments and electrical
connections have been made, put the system in
operation and observe the control for at least three
complete operating cycles before leaving the
installation.
Troubleshooting
If the control system does not function properly, verify
that the unit is wired, configured, and set properly. If
the problem persists, use the following procedures to
determine the cause of the problem:
1. Check for proper supply voltage to the A419
control.
a. Remove the cover by loosening the four
captive cover screws.
!
WARNING: Risk of Electrical Shock.
High voltages may be present at electrical terminals
and other exposed internal metal surfaces. Avoid
contact with all metal surfaces on control when cover
is removed.
b. Use a reliable AC voltmeter to check the
voltage between the COM and 120V or 240V
terminals on line voltage models and the two
24V terminals on low-voltage models. Refer to
Figure 9, Figure 10, and Figure 11.
c. The voltage must be between: 20 and 30 VAC
for 24 volt applications, 102 and 132 VAC for
120 volt applications, 177 and 264 VAC for
208/240 volt applications
Notes: If the voltage reading is within the
required range, proceed to Step 2.
If the voltage reading is not within the required
range, check the power source and input
power wires for problems.
If the MENU button is not pressed after setting a new
value, the new value is not saved and the A419 control
reverts to the previously saved value for that function.
Any saved A419 control setting values are
non-volatile and remain in the control’s memory
during power interruptions.
A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 9
2. Check for proper sensor operation.
Disconnect all power sources to control.
a. Take a temperature reading at the sensor
location, using an accurate thermometer.
b. Disconnect the sensor from the control.
c. Use a reliable ohmmeter, to measure the
resistance across the two sensor leads while
the sensor is at the temperature taken in
Step b.
d. Refer to
Figure 15 to verify that the measured
temperature and resistance conform to
established temperature and resistance
values.
e. If the measured values conform to the values
Figure 15, proceed to Step 3.
in
f. If the sensor’s measured resistance val ue is
substantially different from the expected value
for that temperature, check the sensor wiring.
If sensor wiring is okay, replace the sensor.
T emperature (°F)
260
240
220
200
180
160
140
120
100
80
60
40
20
0
-20
-40
500 700 900 1100 1300 1500 1700 1900 2100
Resistance in Ohms
Temperature (°C)
120
100
80
60
40
20
0
-20
-40
g. Press and hold the MENU button until Setpoint
appears (occurs in about 2 seconds).
h. Use the Up and Down buttons to change the
Setpoint temperature above and below the
current sensor temperature until the output
relay energizes and de-energizes as shown in
Table 4.
If the anti-short cycle delay has a time greater
than 0 minutes, the relay will not energize until
the timed delay has elapsed.
i. If the output relay does not perform as
indicated in
Table 4, replace the A419 control.
j. If proper operation of the A419 control is
verified, reconnect the load and consult the
equipment manufacturer’s instructions for
troubleshooting the controlled equipment.
Table 4: A419 Output Relay Operation
Output
Setpoint
Mode
Operating
Mode
Relay
Energized
at…
Setpoint
Cooling
Cutout
Heating
Cooling Setpoint
Cut-in
Heating Setpoint
Note: When the relay is energized, the N.O. contacts
are closed and the LED is illuminated.
plus
differential
Setpoint
minus
differential
Output Relay
De-energized
at…
Setpoint
Setpoint
Setpoint
minus
differential
Setpoint plus
differential
Figure 15: Nominal Temperature vs.
Sensor Resistance
3. Check the A419 for proper operation.
a. Perform Troubleshooting Steps 1 and 2 before
performing this step.
b. Disconnect the load from the output relay
terminals.
c. Ensure that the Touchpad Lock jumper is
installed, so that the touchpad is unlocked.
d. Reconnect the sensor leads and supply power
to the control.
e. Replace the cover.
f. Check the control settings for proper values.
10 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
Fault Codes
A419 controls are programmed to display certain fault
codes on the LCD as described in
Table 5.
Table 5: Fault Codes Defined
Fault Code Definition System Status Solution
SF flashing
alternately with OP
SF flashing
alternately with SH
EE
Open temperature
sensor or sensor
wiring
Shorted temperature
sensor or sensor
wiring
Program failure Output is off
Output functions according to
the selected sensor failure
mode (SF setting)
Output functions according to
the selected sensor failure
mode (SF setting)
See Troubleshooting section.
Cycle power to reset the control.
See Troubleshooting section.
Cycle power to reset the control.
Reset the control by pressing the Menu
button. If problems persist, replace the
control.
Repairs and Replacement
Do not attempt to repair or recalibrate the
Ordering Information
Refer to Table 6 to order controls and accessories.
A419 Control. In case of a defective or improperly
functioning control, contact your nearest Authorized
Johnson Controls/PENN® Distributor or Sales
Representative.
When contacting your Johnson Controls/PENN
distributor, have the model number of the control
available. This number can be found on the label
inside the cover of the control.
Table 6: Ordering Information
Product Code
Item Description
Number
A419ABC-1C Line Voltage, NEMA 1 Enclosure
A419 Series Electronic Temperature Control
with Display, A99 Sensor Included
A419AEC-1C Line Voltage, NEMA 4X Enclosure
A419 Series Electronic Temperature Control
with Display, A99 Sensor Included
A419GBF-1C 24 VAC, NEMA 1 Enclosure
A419 Series Electronic Temperature Control
with Display, A99 Sensor Included
A419GEF-1C 24 VAC, NEMA 4X Enclosure
A419 Series Electronic Temperature Control
with Display, A99 Sensor Included
A99BB-200C
A99BA-200C
A99BB-25C
BKT287-1R
BKT287-2R
PLT344-1R
CLK350-2C
WEL11A-601R
Replacement Temperature Sensors PTC Sensor with 6-1/2 ft (2 m) Leads
Accessory Mounting Hardware 12 in. (305 mm) long DIN Rail
Digital Clock 7-Day Programmable Digital Clock for controlling
Immersion Well Immersion Well for applying sensor in fluid applications
Supply Voltage: 120 or 240 VAC
Range: -30 to 212°F (-34 to 100°C)
Differential: 1 to 30F° (1 to 30C°)
Sensor Lead Length: NEMA 1 Models 6-1/2 ft (2 m),
NEMA 4X Models 9 in (0.25 m)
Supply Voltage: 24 VAC, Class 2
Range: -30 to 212°F (-34 to 100°C)
Differential: 1 to 30F° (1 to 30C°)
Sensor Lead Length: NEMA 1 Models 6-1/2 ft (2 m),
NEMA 4X Models 9 in (0.25 m)
PTC Sensor with 6-1/2 ft (2 m) Shielded Leads
PTC Sensor with 9 in (0.25 m)
36 in. (914 mm) long DIN Rail
Two End Clamps for DIN Rail Mounting
Temperature Offset Function
A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 11
Technical Specifications
Product
Setpoint Range
Differential Range
Supply Voltage 24 VAC, 60 Hz, Class 2: A419GBF-1 (NEMA 1 Enclosure Model)
Power Consumption
Output Relay Contacts
Electrical Ratings
Sensor Type
Control Ambient
Temperature
Ambient Humidity
Control Material
Agency Listings
A419 Series Electronic Temperature Controls with NEMA 1 General Purpose or NEMA 4X
Watertight, Corrosion-Resistant Enclosures
-30 to 212°F (-34 to 100°C)
1 to 30F° (1 to 30C°)
A419GEF-1 (NEMA 4X Watertight Enclosure Model)
120 or 240 VAC, 60 Hz: A419ABC-1 (NEMA 1 Enclosure Model)
A419AEC-1 (NEMA 4X Watertight Enclosure Model)
1.8 VA Maximum
24 VAC Models: A419GBF-1 (NEMA 1 Enclosure)
A419GEF-1 (NEMA 4X Watertight Enclosure)
100 VA, 30 VAC maximum, Class 2
120/240 VAC Models: A419ABC-1 (NEMA 1 Enclosure)
A419AEC-1 (NEMA 4X Watertight Enclosure)
Applied Voltage: 120 VAC 208 VAC 240 VAC
Horsepower N.O. (N.C.): 1 (0.25) hp 1 (0.33) hp 1 (0.5) hp
Full Load Amperes N.O. (N.C.): 16 (5.8) A 9.2 (4.0) A 8.0 (4.9) A
Locked Rotor Amperes N.O. (N.C.): 96 (34.8) A 55.2 (24) A 48 (29.4) A
Non-inductive Amperes N.O. (N.C.): 15 (10) A 10 (10) A 10 (10) A
Pilot Duty: 125 VA (N.O. contacts) @ 24 to 240 VAC
125 VA (N.C. contacts) @ 120 to 240 VAC
50 VA (N.C. contacts) @ 24 VAC
A99BB Type PTC Sensor (See
Operating: -26 to 140°F (-32 to 60°C)
Shipping: -40 to 185°F (-40 to 85°C)
0 to 95% RH Non-condensing; Maximum Dew Point: 85°F (29°C)
Case and Cover: NEMA 1 High-Impact Thermoplastic
NEMA 4X Watertight, Corrosion-Resistant, High-Impact
Noryl® Thermoplastic
UL: File E27734; CCN’s XAPX (US), XAPX7 (Canada)
FCC: CFR 47, Part 15, Class A. DOC, Class A
Table 6)
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these
specifications, contact Application Engineering at 1-800-275-5676. Johnson Controls, Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
Controls Group
507 E. Michigan Street
P.O. Box 423 Printed in U.S.A.
Milwaukee, WI 53201 www.johnsoncontrols.com
12 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
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