Lennox TAA120S4D

Page 1
 2012 Lennox Industries Inc.
Litho U.S.A.
Corp. 0905−L2
TAA
Service Literature
Revised March 13, 2012
TAA SERIES UNITS
Lennox TAA model blower−coil units are designed for up
flow or horizontal air and indoor applications only. TAA
blower units are available in six models; 072, 090, 120,
150, 180 and 240. The units match up with Lennox TSA
condensing units and Lennox TPA heat pump units
charged with HFC−410A refrigerant.
Information and specifications contained in this manual
are subject to change. Procedures outlined in this manual
are presented as a recommendation only and do not su-
persede or replace local or state codes.
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.
WARNING
Electric shock hazard. Can cause in-
jury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF
at disconnect switch(es). Unit may
have multiple power supplies.
TABLE of CONTENTS
Specifications Page 2. . . . . . . . . . . . . . . . . . . . . . .
Options / Accessories Page 4. . . . . . . . . . . . . . . .
Blower Data Page 5. . . . . . . . . . . . . . . . . . . . . . . . .
Electric Heat Data Page 15. . . . . . . . . . . . . . . . . . .
I Unit Components Page 21. . . . . . . . . . . . . . . . . . .
II Refrigeration System Page 22. . . . . . . . . . . . . . .
III Blower Speed and Belt Adjustment Page 22. .
IV Electric Heat Page 23. . . . . . . . . . . . . . . . . . . . . .
V Diagrams Page 24. . . . . . . . . . . . . . . . . . . . . . . . .

Lennox TAA120S4D Specifications

General

Brand	Lennox
Model	TAA120S4D
Category	Industrial Equipment
Language	English

Summary

Specifications

Options and Accessories

Blower Drives and Cabinet Options

Details options for blower drives and cabinet features like corrosion protection.

Control Systems and Accessories

Lists control system accessories like L Connection and MSAV kits.

Electric Heat and Economizer Kits

Covers available electric heat kits and economizer controls for various models.

Indoor Air Quality and Refrigerant System Parts

Details indoor air quality accessories and refrigerant system components.

Blower Performance Data

Blower Drive Specifications

Blower Motor Electrical Data

Provides electrical specifications for blower motors, including protection and ampacity.

Unit Components Overview

Blower Control Components

Details blower contactor, economizer relay, and overload relay functions.

Electrical Connections and Safety

Describes terminal blocks, condensate overflow protection, and wiring points.

Refrigeration System Description

Blower Speed and Belt Tension

Instructions for adjusting blower speed and belt tension for optimal air volume.

Electric Heat System Components

Heating Elements and Contactors

Details heating elements, their connections, and energizing contactors.

Electric Heat Control Relays and Fuses

Explains sequencer relays, isolation relays, and protective fuses.

Temperature Limits and Transformer

Describes high temperature limits and the control transformer.

Wiring Diagrams and Operation Sequence

TAA072240 Sequence of Operation

Details the sequence of operations for TAA072 and TAA240 models during heat calls.