Service And Recovery; Maintenance - Lennox SSB*H4 Manual

V − SERVICE AND RECOVERY
WARNING
Polyol ester (POE) oils used with R−410A 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 service
valve stub caps until you are ready to make connec-
tions.
IMPORTANT
USE RECOVERY MACHINE RATED FOR R−410A
REFRIGERANT.
If the SSB*H4 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
R−410A.
1 − Use a regulator−equipped nitrogen cylinder to break the
system vacuum. Do not exceed 5 psi. The dry nitrogen
will fill the system, purging any moisture.
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 compo-
nent.
4 − Evacuate the system to remove any moisture and other
non−condensables.
Any time the SSB*H4 sealed system is opened, the
drier must be replaced and the system must be evac-
uated.
Any moisture not absorbed by the polyol ester oil can be re-
moved by evacuation. Moisture that has been absorbed by
the compressor oil can be removed by replacing the drier.
IMPORTANT
Evacuation of system only will not remove moisture
from oil. Drier must be replaced to eliminate mois-
ture from POE oil.
VI − MAINTENANCE
Electric shock hazard. Can cause inju-
ry or death. Before attempting to per-
form any service or maintenance, turn
the electrical power to unit OFF at dis-
connect switch(es). Unit may have
multiple power supplies.
At the beginning of each cooling season, the system should
be serviced. In addition, the system should be cleaned as
follows:
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.
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 ____________.
Page 17
WARNING