Lennox 13HPX Series

Page 1
© 2006 Lennox Industries Inc.
Corp. 0619−L4
13HPX
Service Literature
1.5 to 5 ton
Revised 04−2009
13HPX SERIES UNITS
The 13HPX is a residential split-system heat pump. The
series is designed for use with expansion valves (TXV) and
R−410A refrigerant. All 13HPX units utilize scroll compressors.
13HPX 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 2. . . . . . . . . . . . . . . . . . .
I Unit Components 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Refrigerant System 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
III Charging 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Brazing Procedure 14. . . . . . . . . . . . . . . . . . . . . . . . . . .
VI Diagrams 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODEL NUMBER IDENTIFICATION
Unit Type
HP = Heat Pump Outdoor Unit
Refrigerant
X = R−410A
Nominal Cooling Capacity
018 = 1.5 tons
024 = 2 tons
030 = 2.5 tons
036 = 3 tons
042 = 3.5 tons
048 = 4 tons
060 = 5 tons
061 = 5+ tons
Minor Revision Number
Nominal SEER
Voltage
230 = 208/230V−1phase−60hz
13 HP X − 024 − 230 − 2

Lennox 13HPX Series Specifications

General

Brand	Lennox
Model	13HPX Series
Category	Heat Pump
Language	English

Summary

13 HPX Series Unit Overview

ESD Precautions and Procedures

Essential precautions to protect electronic components from electrostatic discharge during installation and service.

Refrigerant Safety Warning

Warning regarding the safe handling and responsible use of refrigerant, emphasizing potential personal injury or death.

Model Number Identification

Explanation of the model number structure and its components for the 13HPX series units.

Key Unit Components

Control Box and Wiring Diagram

Details the control box, 24V terminal strip, and wiring connections for the 13HPX units.

Compressor Contactor (K1) Function

Describes the single-pole contactor used to energize the compressor in the 13HPX series.

Dual Capacitor (C12) Role

Explains the dual capacitor used for both the fan motor and compressor in 13HPX units.

Defrost System Operation

Defrost Thermostat Operation

Details the defrost thermostat's location and its role in initiating and terminating defrost cycles.

Defrost Control Board Functions

Explains the defrost control board's functions, including timing, diagnostic LEDs, and pressure switch circuits.

Compressor Delay & Test Options

Covers the compressor delay function and the test mode for defrost troubleshooting.

Diagnostic LEDs and Compressor

Defrost Control Board Diagnostics

Describes the diagnostic LEDs on the defrost control board and their corresponding fault indications.

Scroll Compressor Overview

Explains the scroll compressor's design, operation, and its tolerance to liquid return.

External Components and Safety Features

Outdoor Fan Motor Access

Details how to access and replace the outdoor fan motor, including alignment specifications.

Reversing Valve Operation

Describes the function of the reversing valve for refrigerant flow control.

Pressure Switches (S4 & S87)

Explains the high and low pressure switches and their roles in compressor protection.

Refrigerant System Components

Filter Drier Function

Explains the filter drier's purpose in removing moisture and foreign matter from the refrigerant.

Moisture and Acid Check

Outlines procedures for checking system moisture and acid levels using specific kits.

Plumbing and Service Valve Procedures

Refrigerant Piping and Line Sets

Details field refrigerant piping, liquid/vapor lines, and recommended line set sizes.

Service Valve Operation and Safety

Provides instructions on accessing Schrader ports and operating service valves, including safety warnings.

System Charging Procedures

Pumping Down the System

Steps for pumping down the system to isolate components for leak testing or repairs.

Leak Testing the System

Procedure for pressurizing the system with nitrogen to detect leaks.

Evacuation and Charging Methods

System Evacuation Process

Detailed steps for evacuating the system to a deep vacuum using a vacuum pump and gauge.

HFC-410 A Refrigerant Charging

Information on charging with HFC-410A, including oil compatibility and factory charge.

Indoor Airflow Checking

Methods for checking indoor airflow using Delta-T and calculating blower CFM.

Charging Setup and Calculations

Setup for Charging

Instructions for connecting the manifold gauge set for charging the system.

Calculating Refrigerant Charge

Guidance on determining the total refrigerant charge based on nameplate and line set length.

Refrigerant Charge Verification

Weigh-In Refrigerant Charge

Procedure for determining and adding refrigerant charge using the weigh-in method.

Subcooling Method for Charging

Steps for checking and adjusting refrigerant charge using the subcooling method.

Routine Maintenance and Checks

Oil Charge & Outdoor Unit Checks

Covers oil charge specifications and routine maintenance for the outdoor unit.

Indoor Coil and Unit Checks

Details cleaning and inspection procedures for the indoor coil and unit.

Brazing and System Cleaning

Brazing Procedures and Safety

Instructions for brazing refrigerant piping, including safety measures and material selection.

Wiring Diagram and Component Key

13 HPX Unit Wiring Diagram

Provides the schematic wiring diagram for the 13HPX unit, illustrating component connections.

Component Identification Key

Lists and describes the components referenced in the wiring diagram and unit.

13 HPX Operating Sequence

Cooling Mode Operation

Details the sequence of operation for the unit during cooling demand.

Heating and Defrost Modes

Explains the operational sequences for heating demand and defrost mode.