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High Pressure Switch (S4)
This unit is equipped with a high pressure switch which is
located on the liquid line. The SPST, normally closed pres-
sure switch opens when liquid line pressure rises above
the factory setting of 590 ± 15 psig and automatically re-
sets at 418 ± 15 psig.
Homeowners Information
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
In order to ensure peak performance, your system must
be properly maintained. Clogged filters and blocked air-
flow prevent your unit from operating at its most efficient
level. The system should be inspected and serviced be-
fore each cooling and heating season by a licensed pro-
fessional HVAC service technician (or equivalent).
Homeowner Maintenance
The following maintenance may be performed by the
homeowner.
• Contact a licensed professional HVAC technician to
schedule inspection and maintenance appointments for
your equipment before each heating and cooling season.
• Check the indoor unit filter each month and replace the
filter, if necessary.
• Have your Lennox dealer show you where your indoor
unit filter is located. It will be either at the indoor unit
(installed internal or external to the cabinet) or behind
a return air grille in the wall or ceiling. Check the filter
monthly and clean or replace it as needed. Disposable
filters should be replaced with a filter of the same type
and size.
• Check the indoor unit drain line for obstructions month-
ly. The indoor coil is equipped with a drain pan to collect
condensate formed as your system removes humidity
from the inside air. Have your dealer show you the loca-
tion of the drain line and how to check for obstructions.
(This would also apply to an auxiliary drain, if installed.)
• Check the area around the outdoor unit monthly and
remove any obstructions that may restrict airflow to the
outdoor unit. This would include grass clippings, leaves,
or papers that may have settled around the unit.
• Trim shrubbery away from the unit and periodically
check for debris which collects around the unit.
• During the winter months, keep the snow level below
the louvered panels.
NOTE - The filter and all access panels must be in place
any time the unit is in operation. If you are unsure about
the filter required for your system, call your Lennox dealer
for assistance.
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure
of the unit to treated water (i.e., sprinkler systems,
soakers, waste water, etc.) will corrode the surface of
the steel and aluminum parts, diminish performance
and affect longevity of the unit.
Thermostat Operation
See the thermostat homeowner manual for instructions on
how to operate your thermostat.
If your system fails to operate, check the following before
calling for service:
• Verify room thermostat settings are correct.
• Verify that all electrical disconnect switches are ON.
• Check for any blown fuses or tripped circuit breakers.
• Verify unit access panels are in place.
• Verify air filter is clean.
If service is needed, locate and write down the unit model
number and have it handy before calling.
Professional Maintenance
Failure to follow instructions will cause damage to
the unit.
This unit is equipped with an aluminum coil.
Aluminum coils may be damaged by exposure to
solutions with a pH below 5 or above 9. The alumi-
num coil should be cleaned using potable water
at a moderate pressure (less than 50psi). If the
coil cannot be cleaned using water alone, Lennox
recommends 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).
Your heating and air conditioning system should be in-
spected and maintained twice each year (before the start
of the cooling and heating seasons) by a licensed profes-
sional HVAC technician. You can expect the technician to
check the following items. These checks may only be
conducted by a licensed professional HVAC techni-
cian.
Page 21
IMPORTANT
Pre-Service Check
NOTICE !
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