Lennox SL18XP1 Installation Instruction page 19

2. Check the cleanliness of outdoor fan and blade condi­
tion (cracks) and clean or replace them, if necessary.
3. Inspect base pan drains for debris and clean as neces­
sary.
4. Inspect the condition of refrigerant piping and confirm
that pipes are not rubbing copper-to-copper. Also,
check the condition of the insulation on the refrigerant
lines. Repair, correct, or replace as necessary.
5. Test capacitor. Replace as necessary.
6. Inspect contactor contacts for pitting or burn marks.
Replace as necessary.
7. Check outdoor fan motor for worn bearings/bushings.
Replace as necessary.
8. Inspect and clean outdoor coils, if necessary and note
any damage to coils or signs of leakage.
NOTICE !
Failure to follow instructions will cause damage to
the unit.
This unit is equipped with an aluminum coil. Alu­
minum coils may be damaged by exposure to solu­
tions with a pH below 5 or above 9. The aluminum
coil should be cleaned using potable water at a
moderate pressure (less than 50psi). If the coil can­
not be cleaned using water alone, Lennox recom­
mends use of a coil cleaner with a pH in the range of
5 to 9. The coil must be rinsed thoroughly after
cleaning.
In coastal areas, the coil should be cleaned with
potable water several times per year to avoid corro­
sive buildup (salt).
Indoor Unit (Air Handler or Furnace)
1. Inspect component wiring for loose, worn or damaged
connections. Confirm proper voltage plus amperage
of indoor unit.
2. Inspect and clean or replace air filters in indoor unit.
3. Check the cleanliness of indoor blower and clean
blower, if necessary.
4. Inspect the indoor coil drain pans and condensate
drains for rust, debris, obstructions, leaks or cracks.
Pour water in pans to confirm proper drainage from the
pan through to the outlet of the pipe. Clean or replace
as necessary.
5. Inspect and clean indoor coil, if necessary.
6. Inspect the condition of the refrigerant lines and con­
firm that pipes are not rubbing copper-to-copper. Also,
ensure that refrigerant pipes are not being affected by
indoor air contamination. Check condition of insulation
on the refrigerant lines. Repair, correct, or replace as
necessary.
7. Inspect the duct system for leaks or other problems.
Repair or replace as necessary.
8. Check for bearing/bushing wear on indoor blower mo­
tor. Replace as necessary.
9. If your heat pump is matched with a gas- or oil-fired fur­
nace for auxiliary heating, indoor unit service will also
include inspection and cleaning of the burners, and a
full inspection of the gas valve, heat exchanger and
flue (exhaust) system.
General System Test with System Operating
1. Your technician should perform a general system test.
He will turn on the air conditioner to check operating
functions such as the start­up and shut­off operation.
He will also check for unusual noises or odors, and
measure indoor/outdoor temperatures and system
pressures as needed. He will check the refrigerant
charge per the charging sticker information on the out­
door unit.
2. Verify that system total static pressure and airflow set­
tings are within specific operating parameters.
3. Verify correct temperature drop across indoor coil.
Page 19
SL18XP1 SERIES