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©
2003 Lennox Industries Inc.
Corp. 0302−L2
HPXA19
Service Literature
Revised 07−2006
HPXA19 SERIES UNITS
The HPXA19 is a high efficiency residential split−system
heat pump unit, which features a two−step scroll compres-
sor and R410A refrigerant. HPXA19 units are available in
2, 3 (−036 and −038 models), 4 and 5 ton sizes. The series
includes the HPXA19−038, a 3 ton unit equipped with a vari-
able speed condenser fan motor. The series is designed for
use with an expansion valve only (approved for use with
R410A) in the indoor unit.This manual is divided into sec-
tions which discuss the major components, refrigerant sys-
tem, charging procedure, maintenance and operation se-
quence.
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 R410A unit are higher
than pressures in R22 units. Always use service
equipment rated for R410A.
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.
HPXA19 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
General
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data
2
. . . . . . . . . . . . . . . . . .
I Application
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Refrigerant System
16
. . . . . . . . . . . . . . . . . . . . . . . . . .
IV Charging
18
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery
22
. . . . . . . . . . . . . . . . . . . . . . . .
VI Maintenance
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII Diagrams and Operating Sequence
23
. . . . . . . . . . .
