Lennox 10ACC Series

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ã 2002 Lennox Industries Inc.
Litho U.S.A.
Corp. 0201-L1
10ACC
Service Literature
10ACC SERIES UNITS
The 10ACC is a residential split-system condensing
unit available in sizes ranging from 1-1/2 to 5 tons. Con-
densing coil size, circuiting and air volume result in a
minimum SEER rating of 10.0. The series is designed
for use with an expansion valve or RFCIV system in the
indoor unit.
10ACC 1-1/2 to 3 ton units are equipped with reciprocating
compressors. All compressors are hermetically sealed for
long service life. The compressor is installed in the unit on re-
silient rubber mounts to assure quiet, vibration-free operation.
A built-in protection device assures protection from excessive
current and temperatures.
10ACC3-1/2to5ton units are equipped with scroll com-
pressors. The scroll operates likea standard compressorbut
it is unique in the way it compresses refrigerant.
WARNING
Refrigerant can be harmful if it is inhaled. Refriger-
ant must be used and recovered responsibly.
Failure to follow this warning may result in person-
al injury or death.
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.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce-
dure, maintenance and operation sequence.
All specifications in this manual are subject to change.
IMPORTANT
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice must be performed by a qualified installer or
service agency.

Lennox 10ACC Series Specifications

General

Brand	Lennox
Model	10ACC Series
Category	Heat Pump
Language	English

Summary

UNIT INFORMATION

10 ACC Series Overview

Overview of 10ACC condensing units, sizes, SEER rating, and compressor types.

Essential Safety Warnings

Critical warnings on refrigerant hazards and electrical shock risks before servicing.

GENERAL INFORMATION AND COMPONENTS

Unit Capacities and System Matching

Details on 10ACC unit capacities, system matching, and electrical safety warnings.

10 ACC Unit Component Identification

Illustration and identification of key unit components and control box configurations.

CONTROL BOX COMPONENTS

Compressor Contactor K1

Explanation of the compressor contactor's function and wiring in 10ACC units.

Dual Capacitor C12 Function

Description of the dual capacitor used for fan motor and compressor.

Optional Start Capacitor C7

Details on the optional start capacitor and its role in compressor startup.

Optional Potential Relay K31

Information on the optional potential relay and its function with the start capacitor.

SCROLL COMPRESSOR DETAILS

Scroll Compressor Design and Operation

Explanation of the scroll compressor design, operation, and handling precautions.

CONDENSER FAN MOTOR INFORMATION

Fan Motor Operation and Access

Details on the condenser fan motor's requirements, control, and steps for accessing it.

REFRIGERANT SYSTEM AND SERVICE VALVES

Plumbing and Line Set Specifications

Information on field refrigerant piping, line set types, and service port locations.

Service Valve Operation and Schrader Port Access

Instructions for operating liquid/suction line service valves and accessing Schrader ports.

SYSTEM CHARGING AND LEAK TESTING

Pumping Down the System Procedure

Procedure for pumping down the system, including cautions about deep vacuum.

System Leak Testing Steps

Steps for performing leak testing on the system using nitrogen before evacuation.

SYSTEM EVACUATION AND REFRIGERANT CHARGING

System Evacuation Procedure

Detailed steps for evacuating the system, including vacuum level and leak checks.

Refrigerant Charging Guidance

Guidance on charging the system based on line set length and ambient temperature.

REFRIGERANT CHARGING METHODS

Weighing in Charge for Cooler Temps

Method for weighing in refrigerant charge for fixed orifice or TXV systems in cooler temperatures.

Subcooling Method for Fixed Orifice Systems

Procedure for charging fixed orifice systems above 65°F using the subcooling method.

Approach Method for TXV Systems

Procedure for charging TXV systems at or above 60°F using the approach method.

MAINTENANCE AND CHECKS

Outdoor Unit Maintenance Tasks

Checks for condenser coil, connecting lines, wiring, and electrical parameters.

Evaporator Coil and Indoor Unit Checks

Maintenance for evaporator coil, condensate pan, filters, and blower motor.

WIRING DIAGRAM AND OPERATION SEQUENCE

10 ACC Cooling Operation Sequence

Describes the sequence of operation for the 10ACC unit during cooling mode.