MAN# 650411:B
Resetting Factory presets
This procedure will return the device to the original factory presets and clear custom calibration settings.
NOTE: Calibration data for the custom gauge setup will be lost when reset to factory presets.
1. Turn key off.
2. Press and hold SW1 and SW2 and turn key on.
3. Display will read
RES
for reset
4. Display will flash
888
to indicate unit is reset. Factory reset values are listed at the
beginning of the setup portion of this manual.
Checking set up (diagnostic mode #1)
This unit comes with a feature to allow you to mimic normal operating temperatures using the
adjustment pot. This can allow you to test the installation before ever starting the engine. Just
follow these steps.
1.
Turn the key on.
2.
Press SW1 and SW2 at the same time and hold. A number representing the temperature will come up on the
display. This number will blink once to indicate that the unit has entered diagnostic mode. SW1 and SW2 may
now be released and the unit will remain in diagnostic mode until the key is turned off.
3.
Adjust the potentiometer on the left side of the unit while watching the display and listening for the fan. The fan
should start when the display reads hotter than the set ON temp. It should again shut off when the display reads
lower than the OFF temp.
4.
You may also look at your water temperature gauge (if unit is using a gauge) and compare the temperature
reading of the unit to the gauge. The temperatures should be within a few degrees. If not, the wrong gauge may
be selected in the setup routine. Go through setup again by turning off the ignition, pressing and holding SW2 and
turning ignition back on. If a selection cannot be found that closely matches your gauge you may have to custom
calibrate to your gauge. (see Step 10 in setup)
Testing Fan operation (diagnostic mode #2)
A second diagnostic mode allows you to test the fan operation for the mode you have set. This can be used to verify dual
speed, dual fan, or variable speed fan operation without running the engine. Just follow these steps.
1.
Turn the key on.
2.
Press SW1 and SW2 at the same time and hold. A number representing the temperature will come up on the
display. This number will blink once to indicate that the unit has entered diagnostic mode. Release SW1 and
SW2.
3.
Now press SW1 and SW2 together again. This time the display will flash and then display “o-r” “oFF” and the
fans will be off.
4
Pressing SW2 will increase the fan setting, pressing SW1 will decrease the fan setting. To exit this diagnostic
mode, turn off the ignition.
Variable speed off
Variable speed on
1 FAN
oFF – on
oFF – 0.5 – on
2 FAN
oFF – Lo – HI
oFF – 0.5 – Lo – HI
Checking the current reading
The current temperature reading can be displayed on the unit at anytime during normal operation without going into the
diagnostic mode. Simply press and hold SW1 while the key is on and the PAC-2750 is not in setup or diagnostic mode.
The current temperature will be shown on the display until the SW1 is released. If the temperature is not shown and the
dot on the display flashes rapidly then the ignition input on the PAC-2750 is not getting power when the key is on.
Checking revision code
The current unit revision can be displayed on the unit by starting with the key off and holding SW1 while turning the key
on. The software revision will be displayed while SW1 is held.
