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Maintenance
WARNING
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.
Maintenance and service must be performed by a quali-
fied installer or service agency. At the beginning of each
cooling or heating season, the system should be checked
as follows:
Outdoor Unit
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 prelubricated 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.
Unit nameplate_______Actual_______.
7 − Inspect drain holes in coil compartment base and
clean if necessary.
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.
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.
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.
7 − Check amp−draw on blower motor.
Motor nameplate_______Actual_______.
Optional Accessories
Refer to the Engineering Handbook for optional accesso-
ries that may apply to this unit. The following may or may
not apply:
Loss of Charge Kit
High Pressure Switc Kit
Compressor Monitor
Compressor Crankcase Heater
Hail Guards
Mounting Bases
Timed Off Control
Stand−off Kit
Sound Cover
Low Ambient Kit
Monitor Kit
HPXA15 Check Points
Start−up and Performance Check List
Job Name
Job Location
Installer
Unit Model No.
Nameplate Voltage
Rated Load Ampacity
Maximum Fuse or Circuit Breaker
Refrigerant Lines:
Service Valves Fully Opened?
Outdoor Fan Checked?
Job No.
City
City
Serial No.
Date
State
State
Service Technician
Compressor
Outdoor Fan
Indoor Filter Clean?
Electrical Connections Tight?
Supply Voltage (Unit Off)
Vapor Pressure
Thermostat
Refrigerant Charge Checked?
Calibrated?
Properly Set?
Level?
Properly Insulated?
Voltage With Compressor Operating
Leak Checked?
Service Valve Caps Tight?
Indoor Blower RPM
Outdoor Coil Entering Air Temp.
Liquid Line Pressure
S.P. Drop Over Indoor (Dry)
Cooling
Vapor Pressure
Refrigerant Charge Checked?
Liquid Line Pressure
Heating
Sequence of Operation
Heating Correct
Cooling Correct
