Lennox International Inc Heat Pump HPXA12 User Manual

H P x a 1 2  
Lennox’ Elite® SERIES  
Home Comfort Systems  
homeowner’s manual  
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HPXA12  
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 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  
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: HPXA12 –  
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.  
*P504409M*  
504,409M  
2002 Lennox Industries Inc., Dallas, TX  
Litho U.S.A.  
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02/2002  

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