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Lennox CBX32MV-036 User Manual

Lennox CBX32MV-036
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Page 1
2015 Lennox Industries Inc.
Corp. 1005-L2
CBX32MV
Service Literature
Revised April 7, 2015
CBX32MV (HFC-410A) SERIES UNITS (iComfort
®
-enabled)
NOTICE
A thermostat is not included and must be ordered
separately.
A Lennox iComfort
®
thermostat must be used in
communicating applications.
In non-communicating applications, the Lennox
ComfortSense
®
7000 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non-
communicating applications is illustrated in diagrams,
which begin on page 24.
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
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take care
while handling this equipment and use protective cloth
ing.
TABLE OF CONTENTS
Specifications 2.................................
Model Identification 3............................
Blower Data 3..................................
Electric Heat Data 9.............................
Upflow/Downflow Unit Dimensions 13..............
Horizontal LH/RH Unit Dimensions 14..............
Installation Clearances 15.........................
General 15......................................
Installation Requirements 15......................
Brazing Connections 19...........................
Condensate Drain Requirements 22................
Inspecting and Replacing Filters 23.................
Sealing the Unit 23...............................
Field Control Wiring 24...........................
Air Handler Control Button, Display and Jumpers 31..
Configuring Unit 36...............................
Error Code Recall Mode 43........................
Indoor Blower Test 44............................
Checkout Procedures 44..........................
Operation 45....................................
Maintenance 45..................................
Cabinet Insulation 45.............................
Sequence of Operations 47.......................
Unit Components 60..............................
Electric Heat (ECB40) 66.........................
This indoor unit is designed for installation with optional
field-installed electric heat and a matched remote outdoor
unit that is charged with HFC-410A refrigerant. These units,
designed for indoor installation in multiple positions, are
completely assembled for upflow and horizontal right-hand
discharge before being shipped from the factory.
All CBX32MV air handlers are equipped with a
factory-installed, internally mounted check expansion
valve (CTXV), which is suitable for use in HFC-410A
applications.
This air handler is compatible with the ComfortSense® 7000
non-communicating thermostat and non- communicating
outdoor units. In addition, newer model units have the
enhanced capability of communicating with iComfort
®
thermostats and compatible outdoor units using the Lennox
RSBus protocols.
NOTE - For downflow or horizontal left-hand air discharge,
certain field modifications are required.
This document provides information only on the
CBX32MV-XXX-230-6-06 and later which features the new
iComfort-enabled hardware. Refer to Corp. 0206-L3 for
earlier model service related information.

Table of Contents

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Lennox CBX32MV-036 Specifications

General IconGeneral
BrandLennox
ModelCBX32MV-036
CategoryAir Conditioner
LanguageEnglish

Summary

Unit Information

Installation and Service Warnings

Improper installation, adjustment, alteration, service or maintenance can cause injury, death, or property damage.

Specifications

Blower Performance Data

CBX32MV-018/024 Blower Performance

CFM ratings for various jumper settings and external static pressures in heat and cool modes.

CBX32MV-018/024 Blower Motor Watts (+ Setting)

Motor power consumption at various static pressures for heat and cool modes with '+' jumper setting.

CBX32MV-018/024 Blower Watts (NORM & - Settings)

CBX32MV-024/030 Blower Performance

CBX32MV-024/030 Blower Motor Watts (+ Setting)

Motor power consumption at various static pressures for heat and cool modes with '+' jumper setting.

CBX32MV-024/030 Blower Watts (NORM & - Settings)

CBX32MV-036 Blower Performance

CBX32MV-036 Blower Motor Watts (+ Setting)

Motor power consumption at various static pressures for heat and cool modes with '+' jumper setting.

CBX32MV-036 Blower Watts (NORM & - Settings)

CBX32MV-048/060 Blower Performance

CBX32MV-048/060 Blower Motor Watts (+ Setting)

Motor power consumption at various static pressures for heat and cool modes with '+' jumper setting.

CBX32MV-048/060 Blower Watts (NORM & - Settings)

CBX32MV-068 Blower Performance

CBX32MV-068 Blower Motor Watts (+ Setting)

Motor power consumption at various static pressures for heat and cool modes with '+' jumper setting.

CBX32MV-068 Blower Watts (NORM & - Settings)

Electric Heat Data

Electric Heat Data for CBX32MV-018/024 and CBX32MV-024/030 (Single Phase)

Details kW input, Btuh input, blower amps, circuit ampacity, and overcurrent protection.

Electric Heat Data for CBX32MV-036 (Single Phase)

Three Phase Electric Heat Data

Electric Heat Data for CBX32MV-036 (Three Phase)

Electric Heat Data for CBX32MV-048/060/068 (Single Phase)

Brazing Connections and Safety

Brazing Refrigerant Warning

Warning about POE oils absorbing moisture and the importance of keeping the refrigerant system closed.

Brazing Fire Hazard Warning

Nitrogen Purging for Brazing

Brazing Connections Diagram

High Pressure Gas Warning

Brazing Material Hazards

Refrigerant Connections and Line Set Requirements

Field Control Wiring

Electric Shock Hazard in Wiring

Warning about potential electric shock hazards due to foil-faced insulation and improper wiring.

Low Voltage Wiring Safety

Warning about running 24V Class II wiring only through specified openings.

Wiring Connection Procedures

Steps for making wiring connections, including line voltage, grounding, and low voltage wiring.

Wiring Diagram: Communicating System (iComfort)

Wiring Diagram: Cooling (Non-Communicating)

Wiring Diagram: Heat Pump (Non-Communicating)

Wiring Diagram: Cooling with Humiditrol/2nd Stage Fan

Wiring Diagram: Heat Pump with Humiditrol/2nd Stage Fan

Sensor Connections and Wiring

Control Connections and Wiring

Communicating Control Connections

Table detailing terminal functions for communicating systems.

Air Handler Control Connections (Non-Communicating)

Jumper and Link Guide

On-Board Link Option Selection

Guide for configuring unit operation via on-board links for various modes and accessories.

Air Handler Control: Button, Display, and Jumpers

Control Push Button Operation

How to use the push button for mode selection, error code recall, and configuration.

Control Jumpers for Non-Communicating Mode

Explanation of jumper settings for humidification, EvenHeat, blower CFM, and delay profiles.

AHC Configuration, Test, and Error Recall

Configuring Electric Heat Sections

Procedure to manually configure the AHC to detect electric heat sections.

Configuring Unit Size Codes

Procedure to manually select the correct unit size code for the air handler.

Error Code Recall Mode Operation

Instructions for entering, viewing, and clearing error codes from the AHC.

AHC Alert Codes (Communicating/Non-Communicating)

AHC Alert Codes (Continued)

Configuring the Air Handler Unit

Air Handler Control Checkout Procedure

Flowchart for checking the air handler control configuration, including unit size and heat mode.

Configuring Unit Size Codes

Configuring Electric Heat Sections

Heat Mode Selection Flowchart

Flowchart for selecting and detecting electric heat modes and stages.

EVENHEAT Operation Overview

EVENHEAT Operation Flowchart (Part 1)

Part 1 of the flowchart detailing EVENHEAT operation inputs and outputs.

EVENHEAT Operation Details

EVENHEAT Operation Flowchart (Part 2)

Part 2 of the flowchart detailing EVENHEAT operation logic, including temperature adjustments.

Heat Pump Operation (Heating & Cooling)

Cooling Operation Details

Error Code Recall Mode

Entering Error Code Mode

Procedure to enter the error code recall mode by using the push button.

Clearing Error Codes

Instructions for clearing stored error codes from the air handler control.

Indoor Blower Test Mode

Checkout Procedures

System Operation Modes

Electric Heat Operation

Description of the electric heat operation sequence, including sequencers.

Heat Pump Heating Operation

Description of the heat pump heating cycle, including supplemental heat.

Sequence of Operations

Heating Sequence of Operations

Describes the heating sequence, including thermostat demand and control outputs.

Cooling Sequence of Operations

Reference to Table 13 for the cooling sequence of operation.

Fuse Rating Warning for Control Board

Warning against using fuses larger than 3 amps to prevent damage and fire risk.

Cooling Operation and Jumper Summary

Non-Communicating System Sequences

Operating Sequence: ComfortSense 7000 (Single-Stage)

Operating Sequence: ComfortSense 7000 (Two-Stage, Cont.)

Electric Heat ECB40-2.5/4/5 (Single Phase)

Electric Heat ECB40-6/6CB (Single Phase)

Electric Heat ECB40-8/8CB (Single Phase)

Electric Heat ECB40-9CB (Single Phase)

Electric Heat ECB40-12.5/15CB (Single Phase)

Electric Heat ECB40-20CB (Single Phase)

Electric Heat ECB40-25CB (Three Phase)

Third-Stage Heat Wiring

Wiring details for third-stage heat, including jumper removal.

Electric Heat ECB40-8/10/15CB (Three Phase)

Electric Heat ECB40-20/25CB (Three Phase)

First-Stage Heat Wiring

Wiring details for first-stage heat for ECB40-20/25CB three phase units.

Second-Stage Heat Wiring

Wiring details for second-stage heat, including jumper removal.

Unit Components Overview

Discharge Air Sensor (DAT) Installation

Details on the discharge air sensor, its mounting, and temperature resistance chart.

Air Handler Control (AHC) Functionality

Discharge Air Sensor (DAT) Function

Variable Speed Blower Motor (ECM) (B3)

Blower Motor Start-Up Sequence

Blower Motor Internal Operation

Blower Motor Service Danger

Blower Motor Troubleshooting (Regal-Beloit)

Check Power to Blower Motor

Procedure to check for 240V power supply to the blower motor.

Test Blower Motor Operation

Procedure to apply a test signal to verify blower motor operation.

Blower Motor Troubleshooting (Emerson)

Emerson Motor Control Module Test

Procedure to test the Emerson motor control module for damage and resistance.

Control Module Jack Resistance Test

Check resistance between control module jack pins to detect faults.

Additional Blower Motor Troubleshooting

Motor Terminal Resistance Test

Check resistance between motor terminals to detect faults.

Optional Electric Heat (ECB40)

Temperature Limit Switches (S15/S20)

Details on primary and secondary high temperature limit switches for electric heat.

Electric Heat Relays (K32-K36)

Description of electric heat relays and their function in energizing heat stages.

Heating Elements (HE1-HE6)

Description of heating elements, their construction, and operation.

Electric Heat Components Diagram

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