HPXa15
Home Comfort Systems
h o m e o w n e r ’ s m a n ua l
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HPXA15
W I T H R 4 1 0 A
R E F R I G E R A N T
Your system may be equipped with an electronic air
cleaner which will provide respiratory relief by re-
moving up to 90 percent of all airborne particles
which pass through it. If it is, ask your dealer to
instruct you on its maintenance.
D Wiring should be checked for loose connections.
D Voltage must be checked at the indoor and outdoor
units (units operating).
D The amp-draw at the outdoor fan motor and indoor
blower motor should be checked. Values should be
compared with those given on unit nameplate.
Your indoor evaporator coil is equipped with a drain
pan to collect condensate formed as your system re-
moves humidity from the inside air. Have your dealer
show you where the main condensate drain (and auxil-
iary drain, if applicable) runs and how to check the
drain for any obstruction.
D Indoor unit filters should be cleaned or replaced.
D The refrigerant charge should be checked and
system pressures should be gauged.
D The condensate drain line should be checked for
free and unobstructed flow and it should be
cleaned, if necessary.
It is also very
important to
provide
unrestricted
airflow to the
outdoor unit.
Heat Pump Operation
Your new Lennox heat pump has several characteris-
tics that you should be aware of:
Your heat pump satisfies heating demand by
delivering large amounts of warm air into the living
space. This is quite different from gas- or oil-fired
furnaces or an electric furnace which deliver lower
volumes of considerably hotter air
Leaves, trash
or shrubs
crowding the
unit cause the
outdoor unit
to heat the space.
to work harder and use more energy. Keep shrubbery
trimmed away from the unit and periodically check for
debris which may have collected around the unit.
Do not be alarmed if you notice frost on the outdoor
coil in the winter months. Frost develops on the
outdoor coil during the heating cycle when
Lennox Dealers
temperatures are below 45°F (7°C). An electronic
control activates a defrost cycle lasting 5 to 15
minutes at preset intervals to clear the outdoor coil of
the frost. During the defrost cycle, you may notice
steam rising from the outdoor unit. This is a normal
occurrence. The thermostat may engage auxiliary
heat during the defrost cycle to satisfy a heating
demand; however, the unit will return to normal
operation at the conclusion of the defrost cycle.
Nobody knows more about the care and operation of
your new Lennox equipment than your Lennox dealer.
Your Lennox dealer is your best choice for routine
maintenance or service. Lennox’ Quality Dealer
Standards program ensures that when you call your
Lennox dealer, you can count on prompt, courteous
and professional service.
Before the start of each heating and cooling season,
the following service checks should be performed by a
qualified service technician.
As always, electrical power to the unit must be
turned off prior to any unit maintenance.
Your Lennox HPXA15 heat pump is equipped with a
compressor crankcase heater which protects the
compressor from refrigerant slugging during cold
weather operation. If power to your unit has been
interrupted for several hours or more, set the room
thermostat selector to the “Emergency Heat” setting
to obtain temporary heat without the risk of serious
equipment damage. In this operating mode, all
heating demand will be satisfied by auxiliary heat.
Compressor operation is locked out during
D The outdoor and indoor coils should be inspected
and cleaned. The outdoor coil may be flushed with a
water hose.
NOTE – It may be necessary to flush the outdoor
coil more frequently if it is exposed to substances
which are corrosive or which block airflow across
the coil (e.g., pet urine, cottonwood seeds, etc.)
Emergency Heat operation. After a six-hour
compressor crankcase heater warm-up period, the
thermostat can be switched to the “Heat” setting and
normal operation will resume.
D The refrigerant lines should be visually inspected and
the coils should be checked for leaks.
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THERMOSTAT OPERATION -- COMFORT IS AT YOUR FINGERTIPS
Though your thermostat may vary somewhat from the
description below, its operation will be similar.
automatically switch from heating mode to cooling
mode to maintain predetermined comfort settings.
Many heat pump thermostats are also equipped with an
emergency heat mode which locks out heat pump op-
eration and provides temporary heat supplied by the
auxiliary heat.
Temperature Setting Levers
Most heat pump thermostats have two temperature se-
lector levers: one for heating and one for cooling. Set
the levers or dials to the desired temperature setpoints
for both heating and cooling. Avoid frequent tempera-
ture adjustment; turning the unit off and back on before
pressures equalize puts stress on the unit compressor.
Indicating Light
Most heat pump thermostats have an amber light which
indicates when the heat pump is operating in the
emergency heat mode.
Fan Switch
In AUTO or INT (intermittent) mode, the blower
operates only when the thermostat calls for heating or
cooling. This mode is generally preferred when
humidity control is a priority. The ON or CONT mode
provides continuous indoor blower operation,
regardless of whether the compressor or auxiliary heat
are operating. This mode is required when constant air
circulation or filtering is desired.
Temperature Indicator
The temperature indicator displays the actual room
temperature.
Programmable Thermostats
Your Lennox system may be controlled by a
programmable thermostat. These thermostats provide
the added feature of programmable time-of-day
setpoints for both heating and cooling. Refer to the
user’s information manual provided with your
particular thermostat for operation details.
System Switch
Set the system switch for heating, cooling or auto
operation. The auto mode allows the heat pump to
Please record the following information for your
convenience.
Before you call
If your system fails to operate, check the following
before calling for service:
Dealer Name:
Address:
D Check to see that all electrical disconnect
switches are ON.
D Make sure the room thermostat temperature
Phone Number:
selector is properly set.
D Make sure the room thermostat system switch is
Unit Model Number: HPXA15 –
Installation Date:
properly set.
D Replace any blown fuses, or reset circuit
breakers.
D Make sure unit access panels are in place.
D Make sure air filter is clean.
D Locate unit model number and have it handy
before calling.
*P504551M*
504,551M
2002 Lennox Industries Inc., Dallas, TX
Litho U.S.A.
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02/2002
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