Page 1
©
2002 Lennox Industries Inc.
Corp. 0208−L3
HPXA12
Service Literature
Revised 09−2004
HPXA12 SERIES UNITS
The HPXA12 is a high efficiency residential split−system
heat pump unit, which features a scroll compressor and
R410A refrigerant. HPXA12 units are available in sizes
ranging from 1 1/2 through 5 tons. 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
Warranty will be voided if covered equipment is re-
moved from original installation site. Warranty will
not cover damage or defect resulting from:
Flood, wind, lightning, or installation and opera-
tion in a corrosive atmosphere (chlorine, fluorine,
salt, recycled waste water, urine, fertilizers, or oth-
er damaging chemicals).
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.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
TABLE OF CONTENTS
General
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications / Electrical
2
. . . . . . . . . . . . . . . . . . . . . . . .
I Unit Information
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Refrigerant System
13
. . . . . . . . . . . . . . . . . . . . . . . . . .
IV Charging
15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Service and Recovery
19
. . . . . . . . . . . . . . . . . . . . . . . .
VI Maintenance
19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagram and Operating Sequence
20
. . . . . .
