Tools Required - Lennox Elite Series Installation Instructions Manual

• Check the condensate drain line for free and
unobstructed flow; clean, if necessary
• 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
• Check drive belt for wear and proper tension
NOTE - if owner reports insufficient cooling, the unit
should be gauged and refrigerant charge checked
Refer to section on refrigerant charging in this
instruction
IMPORTANT
Use this check-out procedure (see checklist immediately
following) to verify part-load and full-load capacity
operation of two-stage modulation compressors
TOOLS REQUIRED
Refrigeration gauge set
Digital volt/amp meter
Electronic temperature thermometer
On-off toggle switch
PROCEDURE
NOTE - Block outdoor coil to maintain a minimum of 375
psig during testing)
1 Turn main power OFF to outdoor unit
2 Adjust room thermostat set point 5°F above the room
temperature
3 Remove control access panel Install refrigeration
gauges on unit Attach the amp meter to the common
(black wire) wire of the compressor harness Attach
thermometer to discharge line as close as possible to
the compressor
4 Turn toggle switch OFF and install switch in series with
Y2 wire from room thermostat
5 Cycle main power ON
6 Allow pressures and temperatures to stabilize before
taking measurements (may take up to 10 minutes)
7 Record all of the readings for the Y1 demand
8 Close switch to energize Y2 demand Verify power is
going to compressor solenoid
9 Allow pressures and temperatures to stabilize before
taking measurements (may take up to 10 minutes)
10 Record all of the readings with the Y1 and Y2 demand
11 If temperatures and pressures change in the direction
noted in chart, the compressor is properly modulating
from low to high capacity (If no amperage, pressures
or temperature readings change when this test is
performed, the compressor is not modulating between
low and high capacity and replacement is necessary)
12 After testing is complete, return unit to original set up
In order to ensure peak performance, your system must be
properly maintained Clogged filters and blocked airflow
prevent your unit from operating at its most efficient level
1 Air Filter--Ask your Lennox dealer to show you where
your indoor unit's 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
2 Disposable Filter--Disposable filters should be
replaced with a filter of the same type and size
NOTE - If you are unsure about the filter required for
your system, call your Lennox dealer for assistance
,& IMPORTANT
3 Reusable Filter--Many indoor units are equipped
with reusable foam filters Clean foam filters with a
mild soap and water solution; rinse thoroughly; allow
filter to dry completely before returning it to the unit or
grille
NOTE - The filter and all access panels must be in
place any time the unit is in operation
4, Electronic Air Cleaner--Some systems are
equipped with an electronic air cleaner, designed to
remove airborne particles from the air passing through
the cleaner. If your system is so equipped, ask your
dealer for maintenance instructions,
5, Indoor Unit--The indoor unit's evaporator 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 location of
the drain line and how to check for obstructions. (This
would also apply to an auxiliary drain, if installed,)
IMPORTANT
6 Outdoor Unit--Make sure no obstructions restrict
airflow to the outdoor unit Leaves, trash or shrubs
crowding the unit cause the outdoor unit to work harder
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