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Service Literature
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.
Corp. 0905−L2
Revised March 13, 2012
TAA SERIES UNITS
Specifications
Options / Accessories
Blower Data
Electric Heat Data
I Unit Components
II Refrigeration System
III Blower Speed and Belt Adjustment
IV Electric Heat
V Diagrams
Page 1
TABLE of CONTENTS
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TAA
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 2012 Lennox Industries Inc.
Litho U.S.A.

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Summarization of Contents

OPTIONS / ACCESSORIES
ELECTRIC HEAT
Details optional electric heat kits available for different models.
ECONOMIZER
Information on optional economizer controls for the units.
INDOOR AIR QUALITY
Options for air filters and UVC light kits for improved IAQ.
REFRIGERANT SYSTEM
Details optional components for the refrigerant system, like freezestats.
BLOWER DRIVE SPECIFICATIONS
BLOWER MOTOR ELECTRICAL DATA
Electrical specifications including overcurrent protection and circuit ampacity for blower motors.
UNIT COMPONENTS
Blower Contactor K3
Identifies the blower contactor and its function in the unit's operation.
Economizer Relay K43
Details the economizer relay and its role in controlling the economizer.
Blower Motor B3
Refers to blower motor specifications found elsewhere in the manual.
Blower Motor Overload Relay S42
Explains the function of the overload relay for the blower motor.
Terminal Block TB1
Identifies the terminal block for field wiring connections.
Condensate Pan and Over Flow Relay K220 & Switch S149
Describes components for preventing condensate overflow in the unit.
BLOWER SPEED & BELT TENSION
Air Volume Adjustment
Procedure for adjusting air volume using static pressure and RPM readings.
Adjusting Belt Tension
Steps for properly adjusting blower belt tension using pulleys and tensioner.
ELECTRIC HEAT COMPONENTS
Heating Elements HE1, HE2, HE3 & HE4
Describes the construction and electrical configuration of heating elements.
Contactors K15 & K16
Explains the function of contactors for energizing heating elements.
Electric Heat Sequencer Relays K32
Details the operation of sequencer relays controlling heat stages.
Relays K9 and K19
Describes relays used for isolating 24V components and controlling heat stages.
Fuse F3
Explains the role of fuse F3 in protecting electric heat elements.
Fuse F4
Describes fuse F4's function in protecting the indoor blower motor.
Transformer T2
Identifies transformer T2 and its voltage conversion for control circuits.
High Temperature Limit S15 (Primary)
Details the primary high temperature limit switch and its safety function.
High Temperature Limit S20 (Secondary)
Describes secondary high temperature limits for element protection.
WIRING DIAGRAMS
TAA072/240 - SEQUENCE OF OPERATION
Outlines the sequence of operations for TAA072/240 units.
T3EH 072/150, 10-15 kW Y Voltage - Sequence of Operation
Heat Call TSA / TPA
Describes how heat calls initiate blower and contactor operation.
T3EH 072/150, 25-35 kW Y Voltage - Sequence of Operation
First Stage Heat Call
Details the sequence for first stage heat activation.
Second Stage Heat Call TSA / TPA
Explains the sequence for activating second stage heat.
T3EH 072/150, 10-35 kW G, J, M Voltage - Sequence of Operation
Heat Call TSA / TPA
Describes how heat calls initiate blower and contactor operation.