Lennox 14HPX User Manual

Page 1
© 2007 Lennox Industries Inc.
Corp. 0719−L5
14HPX
Service Literature
1.5 to 5 ton
Revised 06−2008
14HPX SERIES UNITS
The 14HPX is a residential split-system heat pump. The
series is designed for use with expansion valves (TXV) and
HFC−410A refrigerant. All 14HPX units utilize scroll compres-
sors.
14HPX series units are available in 1−1/2, 2, 2 -1/2, 3, 3
-1/2, 4 and 5 ton capacities. All major components (indoor
blower and coil) must be matched according to Lennox rec-
ommendations for the compressor to be covered under
warranty. Refer to the Engineering Handbook for approved
system matchups.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce-
dure, maintenance and operation sequence.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
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 person-
al injury or death.
CAUTION
In order to avoid injury, take proper precaution when
lifting heavy objects.
Table of Contents
Specifications / Electrical Data Page 2. . . . . . . . .
I Unit Components Page 4. . . . . . . . . . . . . . . . . . .
II Refrigerant System Page 14. . . . . . . . . . . . . . . . .
III Charging Page 17. . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance Page 22. . . . . . . . . . . . . . . . . . . . . .
V Diagrams Page 23. . . . . . . . . . . . . . . . . . . . . . . . .

Lennox 14HPX Specifications

General

Compressor	Single-stage
Refrigerant	R-410A
Energy Star Certified	Yes
Cooling Capacity (BTU/h)	18, 000 - 60, 000
Operating Temperature Range (Cooling)	Up to 125°F
Sound Rating	76 dB
Efficiency Rating	Up to 14 SEER
HSPF	8.2

Summary

Unit Information and Specifications

Electrostatic Discharge Precautions

Guidelines to prevent damage from electrostatic discharge during installation and service.

Specifications Overview

Detailed technical data, ratings, and electrical information for the 14HPX series units.

Optional Accessories

List of optional components available for the 14HPX series units.

Unit Components

Control Box and Electrical Components

Details on the control box, including terminal strip, contactors, and capacitors.

Defrost System and Sensors

Explanation of the demand defrost control, sensors, pressure switches, and lockout features.

Operational Modes and Testing

Description of operational modes, calibration, test procedures, and fault codes for the defrost control.

Compressor, Fan Motor, and Reversing Valve

Information on scroll compressor, fan motor, reversing valve, and related safety switches.

Drier and Crankcase Heater

Details on the filter drier, moisture checks, and the crankcase heater system for compressor protection.

Refrigerant System

Refrigerant Flow Cycles

Diagrams of cooling and heating cycles, showing refrigerant flow and gauge connections.

Plumbing and Service Valves

Information on refrigerant piping, line sets, service valves, and Schrader port access.

System Handling Procedures

Procedures for pumping down, leak testing, and evacuating the refrigeration system.

Charging and Maintenance

Charging Setup and Calculation

Instructions for setting up, calculating, and adding refrigerant charge to the system.

Maintenance Checks and Procedures

Scheduled maintenance tasks for outdoor unit, indoor coil, and indoor unit components.

Wiring Diagram and Operation

Unit Wiring Diagram

Schematic illustrating the electrical connections and components of the 14HPX unit.

Operating Sequence Details

Step-by-step description of unit operation during cooling, heating, and defrost modes.