Lennox CBX27UH User Manual

07/11 506294−01
*2P0711* *P506294-01*
Page 1
E2011 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
INSTALLATION
INSTRUCTIONS
Elite
®
Series CBX27UH
Units
MULTI−POSITION AIR HANDLERS
506294−01
07/11
Supersedes 05/11
Table of Contents
CBX27UH Up−flow/Down−flow Unit Dimensions 2. . .
CBX27UH Horizontal LH/RH Unit Dimensions 3. . . .
General Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . .
Requirements 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Unit 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brazing Connections 6. . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Condensate Drain 7. . . . . . . . . . . . . . . . .
Inspecting and Replacing Filters 8. . . . . . . . . . . . . . . . .
Sealing the Unit 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Measuring Static Pressure 9. . . . . . . . . . . . . . . . . . . . .
Adjusting the Blower Speed 9. . . . . . . . . . . . . . . . . . . .
Making Electrical Connections 11. . . . . . . . . . . . . . . . . .
Repairing or Replacing Cabinet Insulation 15. . . . . . . . .
TOP CAP SHIPPING
BRACKET (REPLACE
SCREWS IN TOP CAP
AFTER REMOVAL)
HORIZONTAL DRAIN PAN (SEE PAGES 4
AND 6)
BLOWER HOUSING
SUPPORT PAD
IMPORTANT INFORMATION TO INSTALLER
CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.
REFRIGERANT LINE PLUGS
(SEE PAGE 6)
DRIP SHIELD FOR −060 UNITS ONLY
HORIZONTAL APPLICATIONS (SEE
PAGE 5).
D
D
Litho U.S.A.

Lennox CBX27UH Specifications

General

Type	Air Handler
Brand	Lennox
Model	CBX27UH
Efficiency	Up to 16 SEER
Refrigerant	R-410A
Heating Capacity	Varies by model
Nominal Heating Capacity	Varies by model
Airflow	Up to 2000 CFM
Coil Type	Aluminum
Voltage	208/230V
Sound Level	Quiet operation
Height	Varies by model
Width	Varies by model
Length	Varies by model
Weight	Varies by model
Nominal Cooling Capacity	1.5 to 5 tons
Motor Type	ECM
Cabinet Construction	Heavy-gauge, painted steel
Insulation	Fully insulated

Summary

Important Information for Installers

Unit Dimensions and Specifications

Up-flow and Down-flow Unit Dimensions

Detailed dimensions for CBX27UH units in up-flow and down-flow configurations.

Horizontal Unit Dimensions

Dimensions for CBX27UH units in horizontal left- and right-hand discharge configurations.

General Installation and Requirements

General Information and Shipping

Overview of the air handler, safety guidelines, and shipping/packing list details.

Installation Requirements and Standards

Covers unit matching, code compliance (NFPA), and clearance requirements.

Unit Configuration and Installation

Up-flow Installation

Procedures for configuring and installing the unit for up-flow operations.

Horizontal Discharge Installation

Steps for configuring and installing for horizontal right-hand and left-hand discharge.

Down-flow Installation

Instructions for setting up the unit for down-flow airflow configuration.

Refrigerant System Connections

Brazing Connections Procedure

Guidelines and safety precautions for brazing refrigerant lines.

Condensate Management

Installing the Condensate Drain

Instructions for connecting the main and overflow condensate drains.

Airflow and Filtration

Inspecting and Replacing Filters

Procedure for checking, cleaning, or replacing the air filter.

Sealing the Unit

Ensuring airtight seals between the unit and plenums for efficiency.

Performance Measurement and Adjustment

Measuring Static Pressure

Steps to measure static pressure for optimal airflow performance.

Adjusting Blower Speed

Guide to selecting and changing blower motor speed taps for correct CFM.

Electrical Connections

Wiring Procedures and Diagrams

Instructions for making line voltage and low voltage wiring connections.

Cabinet Insulation Maintenance

Repairing or Replacing Cabinet Insulation

Procedures for repairing damaged insulation and safety warnings.