6
A419ABG-3 Electronic Temperature Control Installation Instructions
Setting the Other A419 Control Functions
To set the Differential, Anti-short Cycle Delay,
Temperature Offset, or Sensor Failure operation, use
the following method:
1. Press and hold MENU until the display changes to
flashing SP. (This takes about 2 seconds.)
2. Press Up or Down (arrows) repeatedly until the
desired function is displayed. (See Figure 6.)
3. Press MENU to display the function’s current
value.
4. Press Up or Down (arrows) until the desired value
is displayed.
5. Press MENU to save the new value. The display
returns to the sensor temperature.
IMPORTANT:
If MENU is not pressed after
changing the settings, the new settings are not
saved and the control reverts to the previously
programmed setting values.
Note:
If no setup entry is made for 30 seconds, the
control reverts to the (normal) temperature display.
Note:
Any saved A419 control settings are
non-volatile
and remain in the control’s memory
during power interruptions.
IMPORTANT:
Do not set Setpoint and
Differential values which (when totaled) fall out of
A419 control’s Setpoint range (-30 to 212°F
[-34 to 100°C]). The control will not function properly
if Cut-in or Cutout values are outside of the control’s
Setpoint range.
Checkout
Before applying power, make sure installation and wire
connections are correct for your application. Then
power, operate, and observe the system and A419
control for at least three complete operating cycles
before leaving the installation.
Troubleshooting
!
WARNING: Risk of Electrical Shock.
Do not touch any exposed metal parts with anything
other than properly insulated tools or insulated
probes of the digital voltage meter. Failure to use
properly insulated tools and probes may result in
severe personal injuries or death.
If the control system does not function properly, verify
that the control is wired, and set up properly. If the
problem persists, use the following procedures to
determine the cause of the problem:
IMPORTANT:
Follow these troubleshooting
procedures in the order presented. Do not skip any
of the steps in the procedures.
1.
Check for proper voltage to the A419 control.
a. Remove the cover by loosening the four
captive cover screws.
b. Use a reliable AC voltmeter to check the
voltage between the
COM
and
120V
terminals
on terminal block
TB1
. Refer to Figure 2.
c. The voltage must be between 102 and
132 VAC for 120 VAC applications.
d. If the voltage reading is not within the required
range, check the power source and input
power wires for problems.
2.
Check for proper sensor operation.
a. Disconnect all power sources to control.
b. Using an accurate thermometer, take a
temperature reading at the sensor location.
c. Disconnect the sensor from the control.
d. Using an ohmmeter, measure the resistance
across the two sensor leads while the sensor
is at the temperature taken in Step 2b.
e. Consult Figure 7 to verify that the measured
temperature and resistance conform to
established temperature and resistance
values.
f.
If the measured values conform to the values
in Figure 7, proceed to Step 3.
g. If the sensor’s measured resistance value is
substantially different from the expected
value for that temperature, check the sensor
wiring. If sensor wiring is okay, replace the
sensor.
