Johnson Controls A419 Series - Manual (Page 8)

8 A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin
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 see 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.
Any saved A419 control setting values are
non-volatile and remain in the control’s memory
during power interruptions.
Table 3: Function Ranges and Settings
Function Range
Factory
Setting
SP : Setpoint
-30 to 212°F
(-34 to 100°C)
30
dIF : Differential 1 to 30° (F or C) 5
ASd : Anti-short
Cycle Delay
0 to 12 minutes 1
OFS : Temperature
Offset
0 to 50° (F or C) 0
SF :Sensor Failure
Operation
0 = output
de-energized
1 = output
energized
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.