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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
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TAA
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 2012 Lennox Industries Inc.
Litho U.S.A.

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Summarization of Contents

UNIT INFORMATION
TAA SERIES UNITS
Overview of Lennox TAA Series blower-coil units and their applications.
OPTIONS / ACCESSORIES
Blower Drives and Cabinet Options
Specifications for blower drives and cabinet accessories like float switches and grilles.
Control System Options
Information on network controls, including L Connection® and MSAV Kit.
Electric Heat and Economizer Options
Electric Heat Options
Details on available electric heat kits and their specifications.
Economizer Controls
Information on economizer controls and options.
Air Quality and Refrigerant Accessories
Information on air filters, UVC kits, and refrigerant system accessories.
BLOWER DRIVE SPECIFICATIONS
Motor HP and RPM Ranges
Specifications for motor horsepower and associated RPM ranges.
Blower Motor Electrical Data
Electrical specifications for blower motors, including protection and ampacity.
UNIT COMPONENTS
Blower Motor and Control Components
Details on blower motor, overload relay, contactors, and control relays.
Electrical Safety and Protection Components
Information on transformer, safety limits, and overflow protection devices.
BLOWER SPEED & BELT TENSION
Air Volume Adjustment
Procedure for adjusting blower speed to achieve desired air volume.
Belt Tension Adjustment
Instructions for properly adjusting blower belt tension.
ELECTRIC HEAT COMPONENTS
Heating Elements, Contactors, and Relays
Details on heating elements, contactors K15/K16, and relays K9/K19/K32.
Safety and Protection Devices
Information on fuses, transformer, and high temperature limits S15/S20.
WIRING DIAGRAMS
TAA072/240 Sequence of Operation
Operational sequence for TAA072/240 units during heat calls.
T3EH 072/150, 10-15 kW Y Voltage Sequence of Operation
First Stage Heat Call
Sequence for first stage heat demand in T3EH units.
Second Stage Heat Call
Sequence for second stage heat demand in T3EH units.
T3EH 072/150, 25-35 kW Y Voltage Sequence of Operation
First Stage Heat Call
Procedure for first stage heat demand in T3EH units.
Second Stage Heat Call
Procedure for second stage heat demand in T3EH units.
T3EH 072/150, 10-35 kW G, J, M Voltage Sequence of Operation
Heat Call TSA / TPA
Sequence of operation for TSA/TPA heat calls in G, J, M voltage units.