Page 15
XP25 SERIES
NOTICE !
For more in-depth information, consult the Installa
tion and Service Procedures manual, available as
Corp. 1252-L11 on LennoxPROS.com or through the
Technical Support department at 800-453-6669.
Heat Pump Control -- Defrost Operation
A full description of the heat pump control can be found in
the detailed installation and service procedure manual
available on LennoxPROS.com.
The master control measures differential temperatures to
detect when the system is performing poorly because of
frost build-up on the outdoor coil. The heat pump control
self-calibrates when the defrost system starts and after
each system defrost cycle. The heat pump control
monitors ambient temperature, outdoor coil temperature,
and total run-time to determine when a defrost cycle is
required. The coil temperature sensor is designed with a
spring clip to allow mounting to the outside coil tubing. The
location of the coil sensor is important for proper defrost
operation. Detailed information is given in the XP25
Installation and Service Procedures Corp. 1252-L11,
which is available on LennoxPROS.com.
NOTE - The heat pump control accurately measures the
performance of the system as frost accumulates on the
outdoor coil. This typically will translate into longer running
time between defrost cycles as more frost accumulates on
the outdoor coil before the heat pump control initiates defrost
cycles.
Charging
The XP25 unit is factory-charged with enough HFC-410A
refrigerant to accommodate a 15-foot length of refrigerant
piping. Charge should be checked and adjusted using the
tables provided on the charging procedure sticker located
on the unit access panel. Detailed charging information is
provided in the XP25 Installation and Service Procedures
Corp. 1252-L11, which is available on LennoxPROS.com.
IMPORTANT !
Room thermostat must be turned down at least 5°F
from set point for cooling or turned up 5°F for heating
so charging occurs with system operating at 100%
capacity. Seven-segment display on outdoor control
will show outdoor unit running capacity.
Alarms
Alarm information is provided on on the outdoor unit
access panel and in the iComfort
Wi-Fi
®
Installer's System
Setup Guide. Detail alarm information is also available in
the XP25 Installation and Service Procedures Corp.
1252-L11, which is available on LennoxPROS.com.
Outdoor Control Seven-Segment Display
and Push Button
Information concerning the outdoor control
seven-segment display and push button operations are
available on the unit access panel and in the XP25
Installation and Service Procedures Corp. 1252-L11.
System Component Configuration
(Outdoor Unit)
All outdoor unit setup is completed using the iComfort
Wi-Fi
®
thermostat. Refer to the iComfort
Wi-Fi
®
Installer's
System Setup Guide for complete details on how to setup
this unit to operating in an iComfort™-enabled system.
Homeowner Information
Cleaning of the outdoor unit's coil should be performed by
a licensed professional service technician (or equivalent).
Contact your dealer and set up a schedule (preferably
twice a year, but at least once a year) to inspect and
service your outdoor unit. The following maintenance may
be performed by the homeowner.
IMPORTANT !
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface
of steel and aluminum parts, diminish performance
and affect longevity of the unit.
Outdoor Coil
The outdoor unit must be properly maintained to ensure its
proper operation.
S
Please contact your dealer to schedule proper
inspection and maintenance for your equipment.
S
Make sure no obstructions restrict airflow to the outdoor
unit.
S
Grass clippings, leaves, or shrubs crowding the unit can
cause the unit to work harder and use more energy.
S
Keep shrubbery trimmed away from the unit and
periodically check for debris which collects around the unit.
S
Keep snow level below the louvered panels to ensure
proper performance.
Routine Maintenance
In order to ensure peak performance, your system must be
properly maintained. Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level.
NOTE
—
The filter and all access panels must be in place any
time the unit is in operation. If you are unsure about the filter
required for your system, call your Lennox dealer for
assistance.
1. Ask your Lennox dealer to show you where your indoor
unit's filter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind
a return air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed.
2. Disposable filters should be replaced with a filter of the
same type and size.
3. The indoor evaporator coil is equipped with a drain pan
to collect condensate formed as your system removes
humidity from the inside air. Have your dealer show
you the location of the drain line and how to check for
obstructions. (This would also apply to an auxiliary
drain, if installed.)
