Page 40
XP25
Table 8. Field Test, Diagnostic Recall and Program Menu Options
Display
Display and action (normal operation)
No Change - idle
(*)
No Change - idle (*)
Solid
.
Enter or exit field test and program mode.
Solid
Puts unit in diagnostic mode. (Displays ambient, coil, liquid sensor temperatures and any active error codes.)
Solid
Clears error history (**)
Solid
Enter diagnostic recall mode. Displays up to 10 error codes in memory.
Solid
Start forced defrost test
Solid
Starts outdoor fan.
String
Enter unit code programming.
*No change indicates the display continues to show whatever is currently being displayed for normal operations.
**Note - Once the error history is deleted, it cannot be recovered. After the history is deleted, the unit resets itself.
Table 9. Normal Operation Character Display String
Display
Display and action (normal operation)
Display and action (configuration and test mode)
.
Idle mode — decimal flashes at 1 Hertz > 0.5 second ON, 0.5 second OFF
Cooling operation. Shows
and the cooling demand percentage. Example:
pause
pause
Fan RPM. Shows
and the current fan RPM. Example:
pause
pause
in the display string represents the active error code or codes in the outdoor unit.
Example:
pause
pause
pause
pause
pause
in the display string represents the outdoor ambient temperature in
F at the outdoor sensor on the outdoor unit.
Example:
pause
pause
If enabled,
in the display string represents the outdoor coil temperature in
F at the sensor on the outdoor unit.
Example:
pause
pause
pause
pause. Air conditioning units do not require an outdoor coil sensor.
A 10K resistor, across pins 5 and 6 on the outdoor control sensor harness, prevents false outdoor coil sensor codes. The 10K
resistor causes the 7-segment display to show a constant
77ºF
coil (c) temperature value.
If enabled,
in the display string represents the outdoor liquid line temperature in
F at the sensor on the outdoor unit.
Example:
pause
pause
pause
pause pause
pause
displays when system is in pump down mode.
TYPICAL 7-SEGMENT ACTIVE COOLING OR HEATING DEMAND DISPLAY STRING
COOLING AT
50% DEMAND
OUTDOOR
FAN RPM
OUTDOOR
AMBIENT AIR
TEMP
ACTIVE ERROR
CODE (IF PRESENT)
OUTDOOR
COIL TEMP(*)
OUTDOOR LIQUID
LINE TEMP
BY DEFAULT, COOLING OR HEATING, DEMAND, OUTDOOR FAN RPM, ACTIVE ERROR CODES
AND OUTDOOR AMBIENT TEMPERATURE ARE DISPLAYED.
OUTDOOR COIL AND LIQUID LINE TEMPERATURES CAN BE
MANUALLY ENABLED. IF SYSTEM POWER IS RECYCLED, DISPLAY
STRING REVERTS BACK TO DEFAULT (SEE FIGURE 21 TO ENABLE)
* Air conditioning units do not require an outdoor coil sensor. A 10K resistor, across pins 5 and 6 on the outdoor control sensor harness, prevents
false outdoor coil sensor codes. The 10K resistor causes the 7-segment display to show a constant
77ºF
coil (c) temperature value.
Figure 20. Typical 7-Segment Demand Display String
