Johnson Controls A419 Series - Manual (Page 9)

A419 Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures
Product/Technical Bulletin 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.
See Table 3 for function ranges and factory settings.
O F S
A S d
d I F
S F
S P
Up
Button
Down
Button
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.
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.
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. See
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.