©
2006 Lennox Industries Inc.
Litho U.S.A.
Page 1
Corp. 0634−L6
Service Literature
2 to 5 Ton (7.0 to 17.6 kW)
15CHAX
15CHAX SERIES UNITS
The 15CHAX packaged heat pump units are available in
sizes ranging from 2 through 5 tons (7.0 through 17.6 kW).
15CHAX units are designed for R−410A refrigerant and out-
door residential use only. Units can be installed at ground
level or rooftop applications. Optional field installed supple-
mental electric heat is available in 5, 7.5, 10, 15 and 20 kW.
The 15CHAX units utilize a scroll compressor. It operates
much like a standard compressor, but the scroll compressor
is unique in the way that it compresses refrigerant. The
compressor has overload protection.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change. Procedures outlined in this manual are pre-
sented as a recommendation only and do not supersede or
replace local or state codes.
IMPORTANT
Operating pressures of a R−410A unit are higher
than pressures in R−22 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.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.
TABLE of CONTENTS
Specifications / Accessories
Page 2
. . . . . . . . . .
Electric Heat Capacities
Page 3
. . . . . . . . . . . . .
Electrical / Electric Heat Data
Page 3
. . . . . . . .
Parts Arrangement
Page 4
. . . . . . . . . . . . . . . . .
I Application
Page 5
. . . . . . . . . . . . . . . . . . . . . . .
II Unit Components
Page 5
. . . . . . . . . . . . . . . . .
III Electric Heat
Page 13
. . . . . . . . . . . . . . . . . . . .
IV Charging
Page 14
. . . . . . . . . . . . . . . . . . . . . . . .
V Maintenance
Page 14
. . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagrams
Page 15
. . . . . . . . . . . . . . . .
