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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

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

Code No. LIT-125188 www.johnsoncontrols.com

Summary of content (12 pages)

PAGE 1
Product/Technical Bulletin Issue Date ® A419 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.
PAGE 2
Application IMPORTANT: The A419 Series Temperature Controls are intended to control equipment under normal operating conditions.
PAGE 3
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.
PAGE 4
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.
PAGE 5
Mounting 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 (+) Cut-in (On) Cut-out (Off) Cooling/Cut-in Setpoint Cut-in (On) Differential Cut-out (Off) (-) Figure 7: Cooling Modes When the Heating/Cut-in mode is selected, the differential is above Setpoint.
PAGE 6
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. (Optional) Binary Input Switch A419GBF-1 A419GEF-1 (+) BIN (–) COM (+) SEN TB3 Cable Shield (if used) TB1 (Optional) Binary Input Switch Note: Terminal block TB2 is an isolated SPDT switch (dry contacts).
PAGE 7
Adjustments This section provides instructions for setting up and adjusting the A419 controls using the jumpers and touchpad. = Jumper 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. Installed (Jumper Positioned on Both Pins) = Pins Removed (Jumper Positioned on One Pin) The top set of pins at P4, labeled JUMP1, is used to set the control for Heating or Cooling mode.
PAGE 8
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. Table 3: Function Ranges and Settings Function SP: Setpoint dIF: Differential ASd: Anti-short Cycle Delay Notes: Make sure the Touchpad Lock jumper is in the unlocked (installed) position before adjusting the control. See Figure 13.
PAGE 9
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.
PAGE 10
g. Press and hold the MENU button until Setpoint appears (occurs in about 2 seconds). 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.
PAGE 11
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 Open temperature sensor or sensor wiring Output functions according to the selected sensor failure mode (SF setting) See Troubleshooting section. Cycle power to reset the control.
PAGE 12
Technical Specifications Product Setpoint Range Differential Range Supply Voltage 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°) 24 VAC, 60 Hz, Class 2: 120 or 240 VAC, 60 Hz: Power Consumption 1.