Lennox International Inc. HPXA12 - Manual (Page 3)

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.
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.
It is also very
important to
provide
unrestricted
airflow to the
outdoor unit.
Leaves, trash
or shrubs
crowding the
unit cause the
outdoor unit
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.
Lennox Dealers
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.
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.)
D The refrigerant lines should be visually inspected and
the coils should be checked for leaks.
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.
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.
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
to heat the space.
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
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.
Your Lennox HPXA12 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
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.
HPXA12
W I T H R 4 1 0 A
R E F R I G E R A N T