Homeowner Maintenance; Thermostat Operation; Pre-Service Check - Lennox Dave Signature XP21 Installation Instructions Manual

Homeowner Maintenance

The following maintenance may be performed by the
homeowner.
S Contact a licensed professional HVAC technician to
schedule inspection and maintenance appointments for
your equipment before each heating and cooling sea­
son.
S Check the indoor unit filter each month and replace the
filter, if necessary.
Have your Lennox dealer show you where your indoor
unit filter is located. It will be either at the indoor unit (in­
stalled internal or external to the cabinet) or behind a re­
turn air grille in the wall or ceiling. Check the filter monthly
and clean or replace it as needed.
Disposable filters should be replaced with a filter of the
same type and size.
S Check the indoor unit drain line for obstructions monthly.
The indoor 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 loca­
tion of the drain line and how to check for obstructions.
(This would also apply to an auxiliary drain, if installed.)
S Check the area around the outdoor unit monthly and re­
move any obstructions that may restrict airflow to the
outdoor unit. This would include grass clippings, leaves,
or papers that may have settled around the unit.
S Trim shrubbery away from the unit and periodically
check for debris which collects around the unit.
S During the winter months, keep the snow level below the
louvered panels.
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.
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.

Thermostat Operation

See the thermostat homeowner manual for instructions on
how to operate your thermostat.
If your system fails to operate, check the following before
calling for service:
S Verify room thermostat settings are correct.
S Verify that all electrical disconnect switches are ON.
S Check for any blown fuses or tripped circuit breakers.
S Verify unit access panels are in place.
S Verify air filter is clean.
S If service is needed, locate and write down the unit model
number and have it handy before calling.
Extended Power Outage
The heat pump is equipped with a compressor crankcase
heater which protects the compressor during cold weather
operation.
If power to your unit has been interrupted for several hours
or more, set the room thermostat selector to the EMER­
GENCY HEAT setting to obtain temporary heat without the
risk of serious damage to the heat pump.
In EMERGENCY HEAT mode, all heating demand is satis­
fied by auxiliary heat; heat pump operation is locked out.
After a six‐hour compressor crankcase warm‐up period,
the thermostat can be switched to the HEAT setting and
normal heat pump operation may resume.
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IMPORTANT !

Pre-Service Check