Field Test Mode Operation; Pump Down Mode Operation; Forced Defrost Mode; Pump Down Jumper - Lennox XP25-024-230-01 Installation And Service Procedure

Error Code Recall Mode (Note - control must be in idle mode)
E To enter error code recall mode, push and hold button until solid E appears, then release button. Control displays up to 10 error codes
stored in memory. If E 0 0 0 is displayed, there are no stored error codes.
—
To exit error code recall mode, push and hold button until solid three horizontal bars appear, then release button. Note - Error codes
—
are not cleared.
—
To clear error codes stored in memory, continue to push button while the 3 horizontal bars are displayed. Release button when solid c
c
is displayed.
Push and hold for one (1) second, release button. 7-Segment displays
c
0 0 0 0 and exits error recall mode.

FIELD TEST MODE OPERATION

The field test mode allows the unit to be put into diagnostic
mode and allows the installer to perform multiple tests on the
control / unit.

Forced Defrost Mode

This mode is available for heat pump units only. This mode
can only be selected when the unit is in heating mode and
the ambient sensor is reading a temperature below 65ºF.
•
When in this mode, the coil and ambient sensor
readings are shown on the 7-segment display.
•
The control indicates an active defrost state.
•
The menu mode automatically exits when forced defrost
is selected. The appropriate values are shown on the
7-segment display.
•
The 7-segment display indicates defrost mode as
described in table 7.
•
Forced defrost mode exits under the following
conditions:
A Defrost period expired
B Defrost termination temperature reached
C Heating demand satisfied
D Push button is pressed and released without
entering the menus
Diagnostic Mode
Diagnostic mode is only available when the system is idle or
during an active / suspended call for heating or cooling.
Diagnostic mode is terminated when the exit command is
given, the push button is pressed and released without
entering the diagnostic menu, or 10 minutes has passed,
whichever comes first.
When this mode is selected, all installed temperature sensor
valves (non-open and non-short) is shown on the 7-segment
display. The following system status codes are displayed:
•
Heating / Cooling
•
Defrost Status
•
Percentage demand operation
•
Outdoor fan RPM
•
Active error codes
Outdoor Fan Mode
This mode is only available while the system is in idle mode.
This mode can be exited with the proper command or after
10 minutes has passed.
In this mode, the control energizes the outdoor fan at the
highest speed. The control continuously displays the fan
RPM on the 7-segment display.

PUMP DOWN MODE OPERATION

1. Turn room thermostat OFF.
2. Install a set of refrigerant gauges on the system to
monitor the pressure.
NOTE - All operation monitoring devices: high pressure
switch, low pressure switch and compressor internal
vacuum protection remain active in the system. This
prevents the compressor from recovering all the system
refrigerant into the outdoor unit.
NOTE - If the pump down jumper is in the ON position during
power-up, it is ignored.
3. Move the Pump Down jumper (see page Page 75 for
location) from the OFF position to the ON position.
PUMP DOWN
Figure 19. Pump Down Jumper
4. Shut off the liquid line service valve to stop the flow of
refrigerant into the indoor coil.
5. After a three-second delay, the compressor and outdoor
fan increases speed up to 100% capacity. (Indoor fan
remains OFF.)
6. Monitor the low-side pressure at the outdoor unit. The
internal vacuum protection in the compressor and/or
one of the pressure switches prevent full recovery of all
of the refrigerant into the outdoor unit. When the system
reaches this condition,close the suction line service
valve and move the Pump Down Jumper to the OFF
position.
NOTE - The outdoor control stays in pump down mode for
five minutes, after which the outdoor control initiates a
compressor shutdown sequence.
7. Use a refrigerant recovery machine to recover the
remaining refrigerant on the indoor side of the system.
Page 39
ON
OFF
PUMP DOWN
ON
OFF
XP25