Service And Recovery; Maintenance - Lennox HPXA12 Series Unit Information

V − SERVICE AND RECOVERY
WARNING
Polyol ester (POE) oils used with R410A refrigerant
absorb moisture very quickly. It is very important
that the refrigerant system be kept closed as much
as possible. DO NOT remove line set caps or ser-
vice valve stub caps until you are ready to make
connections.
IMPORTANT
Use recovery machine rated for R410 refrigerant.
If the HPXA12 system must be opened for any kind of ser-
vice, such as compressor or drier replacement, you must
take extra precautions to prevent moisture from entering
the system. The following steps will help to minimize the
amount of moisture that enters the system during recovery
of R410A.
1 − Use a regulator−equipped nitrogen cylinder to break
the system vacuum. Do not exceed 5 psi. The dry nitro-
gen will fill the system, and will help purge any mois-
ture.
2 − Remove the faulty component and quickly seal the sys-
tem (using tape or some other means) to prevent addi-
tional moisture from entering the system.
3 − Do not remove the tape until you are ready to install
new component. Quickly install the replacement com-
ponent.
4 − Evacuate the system to remove any moisture and other
non−condensables.
The HPXA12 system MUST be checked for moisture
any time the sealed system is opened.
Any moisture not absorbed by the polyol ester oil can be re-
moved by triple evacuation. Moisture that has been ab-
sorbed by the compressor oil can be removed by replacing
the drier.
IMPORTANT
Evacuation of system only will not remove mois-
ture from oil. Drier must be replaced to eliminate
moisture from POE oil.
VI − MAINTENANCE
In order to maintain the warranty on this equipment, the
HPXA12 system must be serviced annually and a record of
service maintained. The following should be checked be-
tween annual maintenance:
A − Outdoor Unit
1 − Clean and inspect the outdoor coil. The coil may be
flushed with a water hose. Ensure the power is turned
off before you clean the coil.
2 − Condenser fan motor is prelubricated and sealed. No
further lubrication is needed.
3 − Visually inspect connecting lines and coils for evidence
of oil leaks.
4 − Check wiring for loose connections.
5 − Check for correct voltage at unit (unit operating).
6 − Check amp−draw condenser fan motor.
Unit nameplate _________ Actual ____________ .
NOTE − If owner complains of insufficient cooling, the unit
should be gauged and refrigerant charge checked. Refer
to section on refrigerant charging in this instruction.
1 − Clean and inspect condenser coil. (Coil may be flushed
with a water hose after disconnecting power).
2 − Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
B − Indoor Coil
1 − Clean coil, if necessary.
2 − Check connecting lines and coils for evidence of oil
leaks.
3 − Check the condensate line and clean it if necessary.
C − Indoor Unit
1 − Clean or change filters.
2 − Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
3 − Belt Drive Blowers − Check belt for wear and proper ten-
sion.
4 − Check all wiring for loose connections
5 − Check for correct voltage at unit (blower operating).
6 − Check amp−draw on blower motor
Unit nameplate_________ Actual ____________.
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