Lennox 10ACC-030-230 User Manual

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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-030-230 Specifications

General

Brand	Lennox
Model	10ACC-030-230
Category	Heat Pump
Language	English

Summary

10ACC Series Unit Overview

10ACC Series Unit Introduction

Details the 10ACC residential split-system condensing unit, its sizes, SEER rating, and compressor types.

Critical Safety Warnings

Highlights critical warnings regarding refrigerant handling, electrical shock, and general safety for installation and service.

Electrical and Specification Data

Electrical Data Summary

Presents electrical specifications including voltage, ampacity, fuse size, and motor ratings for 10ACC models.

Unit Specifications

Details unit specifications like tonnage, refrigerant connections, coil size, fan motor, and weights for 10ACC models.

Optional Accessories

Lists optional accessories available for the 10ACC series units, such as crankcase heaters and hail guards.

General Information and Unit Components

General Safety and Unit Description

Covers general safety warnings and an overview of major unit components illustrated in Figure 1.

Control Box Diagrams

Illustrates the control box for reciprocating and scroll compressors, showing key components like contactors and capacitors.

Control Box Components

Compressor Contactor (K1)

Explains the function and operation of the compressor contactor (K1) in the 10ACC unit's control box.

Capacitors and Relays

Details the dual capacitor (C12), start capacitor (C7), and potential relay (K31) used in the 10ACC control box.

Scroll Compressor Operation

Scroll Compressor Design and Function

Explains the design, operation, and unique compression concept of the scroll compressor used in 10ACC units.

Scroll Compressor Precautions

Describes how the scroll compressor compresses gas and warns against using it for evacuation due to potential damage.

Condenser Fan Motor

Condenser Fan Motor Function

Explains that the condenser fan motor uses a run capacitor and is controlled by the compressor contactor.

Condenser Fan Motor Access

Details how to access the condenser fan motor assembly and replace the motor, referencing Figures 8 and 9.

Refrigerant System and Service

Refrigerant System Plumbing

Covers field refrigerant piping, line set types, and connection sizes for the 10ACC series.

Service Valve Operation

Explains how to operate liquid and suction line service valves, including accessing the Schrader port and closing the valve.

Charging Procedures

Ball Type Suction Line Service Valve

Describes the ball-type full service valve used on 5-ton units and its service port.

Pumping Down and Leak Testing

Details the process for pumping down the system and performing leak testing before evacuation.

System Evacuation and Charging

System Evacuation Process

Step-by-step guide for evacuating the system to the required vacuum level, including precautions.

Refrigerant Charging Methods

Explains factory charge, adjustments for line set length, and methods based on outdoor temperature.

Charging Techniques

Weighing Charge for Fixed Orifice/TXV

Guidance on weighing refrigerant charge for fixed orifice or TXV systems, especially in cool weather.

Subcooling Method for Fixed Orifice

Details how to use the subcooling method to charge fixed orifice systems when outdoor temp is above 65°F.

Approach Method for TXV Systems

Explains using the approach method for TXV systems when outdoor temperature is 60°F or above.

Maintenance Checks

System Pressure Checks

Guidance on using Table 5 for performing maintenance checks on system pressures and potential issues.

Condenser and Evaporator Coil Maintenance

Instructions for cleaning and inspecting condenser and evaporator coils, including condensate pan.

Indoor Unit Maintenance

Covers cleaning filters, adjusting blower speed, checking belts, wiring, voltage, and amp-draw.

Wiring Diagrams and Operation Sequence

10ACC Operating Sequence

Details the sequence of operation for cooling mode, including thermostat demand and component activation.

Wiring Diagram Components

Identifies key components in the wiring diagram, such as capacitors, contactors, and motors.