Lennox TAA Series

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 TAA Series Specifications

General

Brand	Lennox
Model	TAA Series
Category	Industrial Equipment
Language	English

Summary

UNIT INFORMATION

TAA SERIES UNITS

Introduction to the TAA series of blower-coil units.

SPECIFICATIONS

OPTIONS ACCESSORIES

BLOWER DATA

BLOWER DRIVE SPECIFICATIONS

BLOWER MOTOR ELECTRICAL DATA

Electrical specifications for the blower motor, including protection and ampacity.

I - UNIT COMPONENTS

Blower Motor Overload Relay S42

Monitors blower motor current and protects against overload conditions.

Terminal Block TB1

Location for all field wiring connections.

Condensate Pan and Over Flow Relay

Prevents condensate overflow by de-energizing the unit.

II - REFRIGERATION SYSTEM

BLOWER SPEED & BELT TENSION

Procedures for adjusting blower speed and belt tension.

IV - Electric Heat Components

Heating Elements HE1, HE2, HE3 & HE4

Composed of helix wound bare nichrome, energized by contactors.

Contactors K15 & K16

Relays that energize heating elements based on thermostat demand.

Electric Heat Sequencer Relays K32

Sequencer relays that control different stages of electric heat.

V - Wiring Diagrams

TAA072240 - SEQUENCE OF OPERATION

Describes the sequence of operations for TAA072/240 units.

T3 EH 072150, 10-15 kW Y Voltage - Sequence of Operation

Heat Call TSA TPA

Steps for heat call operation in TSA/TPA units.

T3 EH 072150, 25-35 kW Y Voltage - Sequence of Operation

First Stage Heat Call

Details the first stage heat call sequence for TSA/TPA units.

T3 EH 072150, 10-35 kW G, J, M Voltage - Sequence of Operation

Heat Call TSA TPA

Outlines the heat call sequence for G, J, M voltage units.