Page 67
XP21
Maintenance
DEALER
Outdoor Unit
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each cooling
season, the system should be checked as follows:
1. Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
2. Outdoor unit fan motor is pre−lubricated and sealed. No
further lubrication is needed.
3. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
4. Check all wiring for loose connections.
5. Check for correct voltage at unit (unit operating).
6. Check amp draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
7. Inspect drain holes in coil compartment base and clean
if necessary.
NOTE If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge should be
checked.
Outdoor Coil
It may be necessary to flush the outdoor coil more frequent-
ly if it is exposed to substances which are corrosive or
which block airflow across the coil (e.g., pet urine, cotton-
wood seeds, fertilizers, fluids that may contain high levels
of corrosive chemicals such as salts)
Outdoor Coil The outdoor coil may be flushed with
a water hose.
Outdoor Coil (Sea Coast) Moist air in ocean loca-
tions can carry salt, which is corrosive to most metal.
Units that are located near the ocean require frequent
inspections and maintenance. These inspections will
determine the necessary need to wash the unit includ-
ing the outdoor coil. Consult your installing contractor
for proper intervals/procedures for your geographic
area or service contract.
INDOOR UNIT MAINTENANCE
Indoor Unit
1. Clean or change filters.
2. Lennox blower motors are prelubricated and permanent-
ly sealed. No more lubrication is needed.
3. 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.
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amp draw on blower motor.
Motor Nameplate:_________ Actual:__________.
Indoor Coil
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
Locations with Possibility of Heavy Snow or
Freezing Rain Accumulation
Heavy snow and/or freezing rain can interfere with the per-
formance of the outdoor fan assembly. Lennox
recommends use of the optional snow guard (X8782) in
these areas.
Figure 34. Snow Guard Top Cover X8782
SunSource
®
Home Energy System
This Dave Lennox Signature
®
Collection heat pump is fac-
tory−equipped with components that make it SunSource
®
Solar−Ready. These units can be matched with solar mod-
ules and other optional equipment so that they can become
part of a SunSource
®
Home Energy System.
Units can be upgraded for use with solar equipment at the
time of installation or in the future.
Solar energy is first used to meet cooling/heating de-
mands. When the outdoor unit is not operating, the system
powers lighting, appliances and other electronic devices in
the home. Any surplus power is sent back to the utility com-
pany for a possible credit (check with your local utility
company for availability).
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