Lennox 14HPX-036-230-10 User Manual

Page 1
Corp. 0719-L5
14HPX
Service Literature
Revised April, 2017
INSTALLATION AND SERVICE
PROCEDURE
LOUVERED
NON-LOUVERED
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or
damage to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox Product Specification bulletin. Coils
previously charged with HCFC-22 must be flushed.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single‐pole contactors. Disconnect all
remote electric power supplies before
opening access panel. Unit may have
multiple power supplies.
TABLE OF CONTENTS
Model Number Identification 2......................
Typical Serial Number Identification 2..............
Specifications 2.................................
Electrical Data 4................................
Unit Dimensions 7.................................
Typical Unit Parts Arrangement 8...................
General Information 9.............................
Operating Gauge Set and Service Valves 9...........
Unit Placement 12.................................
Removing and Installing Louvers 13.................
New or Replacement Line Set 15....................
Brazing Connections 17...........................
Flushing Line Set and Indoor Coil 20................
Installing Indoor Metering Device 21................
Leak Test Line Set and Indoor Coil 22...............
Evacuating Line Set and Indoor Coil 23.............
Electrical Connections 24..........................
System Operation (14HPX-XXX-230-01 through -016)26
Defrost System (14HPX-XXX-230-01 through -016) 26.
System Operation (14HPX-XXX-230-017) 31.........
Defrost System (14HPX-XXX-230-017) 31............
Maintenance 32...................................
Start-Up and Performance Checklist 35..............
Sequence of Operations 36.........................
Servicing Unit Void of Charge 40....................
Start-Up 40.......................................
System Refrigerant 40.............................
The Merit
®
14HPX model is designed for use with
HFC-410A refrigerant only. This unit must be installed with
an approved indoor air handler or coil. See the Lennox
14HPX Product Specification bulletin (EHB) for approved
indoor component matchups.
This outdoor unit is designed for use in systems that use the
following refrigerant metering device:
 Check thermal expansion valve (CTXV)
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.

Lennox 14HPX-036-230-10 Specifications

General

Model Number	14HPX-036-230-10
Category	Heat Pump
Brand	Lennox
Cooling Capacity	3 Tons
Heating Capacity	3 Tons
SEER Rating	14
HSPF Rating	8.2
Phase	1
Refrigerant Type	R-410A
Sound Rating (Outdoor Unit) (dB)	76
Cooling Capacity (BTU)	36, 000 BTU
Heating Capacity (BTU)	36, 000 BTU
Voltage	230V

Summary

Safety and Important Notices

Installation and Service Safety Warnings

Critical warnings about installation, adjustment, alteration, and service hazards.

Refrigerant Handling and Environmental Notes

Service Tools and Procedures

Refrigerant Line Set Management

Brazing Connections and Safety

Procedures and safety precautions for brazing refrigerant line set connections.

System Preparation Procedures

Flushing Line Set and Indoor Coil

Steps for flushing the system to remove contaminants before charging.

Installing Indoor Metering Device

Leak Test Line Set and Indoor Coil

Procedure for testing the system for refrigerant leaks.

Evacuating Line Set and Indoor Coil

Steps to evacuate the system to remove air and moisture.

Electrical Connections and Thermostat

Control Wiring Diagrams

System Operation and Defrost Control (Models -01 to -012)

Defrost System Description and Components

Explains the defrost system, its controller, and sensors.

Diagnostic LEDs and Pressure Switch Features

Explains diagnostic LEDs and pressure switch functions for defrost control.

System Operation and Defrost Control (Model -017)

System Operation Overview

Details operation of cooling, heating, and defrost for model -017.

Defrost System Control (CMC1) and Timing

Describes the defrost control board and its timing pin selections.

Control Functions and Maintenance

Defrost Control Diagnostic LEDs and Faults

Details diagnostic LEDs and fault/lockout codes for the defrost control.

Unit Maintenance Procedures

Heat Pump Operation and Service Checks

Performance Checks and Start-Up

Start-Up and Performance Checklist

A checklist for verifying proper unit start-up and performance.

Sequence of Operations and Wiring Diagrams

14HPX Unit Diagram

Typical Unit Wiring Diagrams

System Operation and Refrigerant Management

14HPX Operating Sequence Details

Outlines the step-by-step sequence of operations for heating and cooling.

Servicing Units Void of Charge

Procedures for servicing units that are void of refrigerant.

Start-Up Procedures

System Refrigerant Procedures

Procedures for connecting gauges, checking airflow, and managing refrigerant.

Refrigerant Charging Procedures

Gauge Set Connections for Charging

Airflow and Refrigerant Adjustment

Adding or Removing Refrigerant

Guidance on adding or removing HFC-410A refrigerant.

Checking Indoor Airflow Using Delta-T

Refrigerant Charging Methods and Data

Weigh In Method for Initial Charge

Subcooling Method for Charge Verification

Charging Data Tables

HFC-410A Temperature-Pressure Data

Applicable Charging Sticker by Unit Model