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©
2005 Lennox Industries Inc.
Corp. 0506−L2
HPXA16
Service Literature
Revised 07−2006
HPXA16 SERIES UNITS
The HPXA16 is a high efficiency residential split−system
heat pump unit, which features a two−stage scroll compres-
sor and R−410A refrigerant. HPXA16 units are available in
2, 3, 4 and 5 ton sizes. The series is designed for use with
an expansion valve only (approved for use with R−410A) in
the indoor unit. This manual is divided into sections which
discuss the major components, refrigerant system, charg-
ing procedure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change.
IMPORTANT
Operating pressures of this R−410A unit are higher
than pressures in R22 units. Always use service
equipment rated for R−410A.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
IMPORTANT
The Clean Air Act of 1990 bans the intentional vent-
ing of (CFC’s and HFC’s) as of July 1, 1992. Approved
methods of recovery, recycling or reclaiming must
be followed. Fines and/or incarceration my be levied
for noncompliance.
DANGER
Shock Hazard
Remove all power at disconnect be-
fore removing access panel.
HPXA16 units use single-pole con-
tactors. Potential exists for electrical
shock resulting in injury or death.
Line voltage exists at all components
(even when unit is not in operation).
Table of Contents
Specifications / Electrical Data
. . . . . . . .
I Application
. . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
. . . . . . . . . . . . . . . . .
III Refrigerant System
. . . . . . . . . . . . . . .
IV Charging
. . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery
. . . . . . . . . . . . .
VI Maintenance
. . . . . . . . . . . . . . . . . . . .
VII Diagrams and Operating Sequence Page 22
