Lennox 16B27

©
2017 Lennox Industries Inc.
Dallas, Texas, USA
CONTROLS
KITS AND ACCESSORIES
506461-03
11/2017
Supersedes 506461-02
AIR HANDLER CONTROL FIELD
REPLACEMENT KIT
Guidelines for Air Handler Control Field Replacement (16B27)
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
WARNING
Electric Shock Hazard! – Disconnect all
power supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
WARNING
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge
by putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools
on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
Table of Contents
Shipping and Packing List
..............................2
General
.............................................................2
Air Handler Control Removal and
Installation
........................................................2
For All Applications ............................................................ 2
For Non-Communicating Applications Only ....................... 2
Field Control Wiring ........................................5
Control and Sensor Connection Requirements ................. 7
Discharge Sensor (DAT) .................................................... 7
Outdoor Air Sensor (OAS) ................................................. 7
Indoor Blower Signal 6-Pin Connector (P7)....................... 7
Air Handler Control 9-Pin Connector (P8) ......................... 7
Air Handler Control Button and Display ........8
Push Button ....................................................................... 8
Seven-Segment Display .................................................... 8
Air Handler Jumpers ..................................... 11
Delay Prole 1 ................................................................ 12
Delay Prole 2 ................................................................. 12
Delay Prole 3 ................................................................. 12
Delay Prole 4 ................................................................. 12
Seven-Segment Display .................................................. 12
Target CFM Tables .........................................13
Unit Operating Sequences ............................17
Conguring Unit
............................................19
Checkout ......................................................................... 19
Unit Size Code................................................................. 20
Electric Heat .................................................................... 21
EvenHeat Operation ........................................................ 22

Lennox 16B27 Specifications

General

Model	16B27
Type	Heat Pump
SEER Rating	Up to 16
HSPF Rating	Up to 9.0
Refrigerant	R-410A
Stages	Single-Stage

Summary

CONTROLS KITS AND ACCESSORIES

General Safety Information

Important warnings and cautions for installation and service of air handler controls.

Shipping and Packing List

General Information

Air Handler Control Removal and Installation

Air Handler Control Replacement Procedure

Preparation and Wiring Transfer

Steps for powering down, verifying settings, and transferring wiring to the new control.

Control Installation and Configuration

Instructions for installing the new control, setting unit size, and system configuration.

Jumper and Link Guide

Blower Speed and Mode Configuration

Guide for setting blower speeds and configuring modes using jumpers.

System and Delay Profile Jumpers

Explanation of jumpers for system options, heat pump links, and blower delay profiles.

Field Control Wiring

Typical Wiring Diagram and Connections

Illustrates wiring connections and recommended blower speed tap selections.

Blower Speed Tap Selection Details

Detailed table for selecting blower speed taps based on model and operating mode.

Component Connections

Electric Heat Relay and 9-Pin Connector

Details on the electric heat relay and the 9-pin connector wiring.

Discharge Air Sensor and Plenum Mounting

Information on connecting the discharge air sensor and its mounting in the plenum.

Control and Sensor Connection Requirements

Discharge Air Sensor (DAT) Requirements

Requirements for the discharge air sensor, its purpose, and catalog number.

Outdoor Air Sensor (OAS) and Blower Signal

Details on connecting the outdoor air sensor and the indoor blower signal connector.

9-Pin Connector and Electric Heat Wiring

Wiring information for the 9-pin connector, including electric heat connections.

Air Handler Control Button and Display

Push Button Operation and Display Functions

Explanation of the push button for navigation and the seven-segment display codes.

Configuration and Test Functions

How to configure electric heat, perform blower tests, and set unit size codes.

Seven-Segment Status Display

Display Modes and Descriptions

Detailed explanation of various status displays like Idle Mode, Cooling Stage, and Error Codes.

Diagnostic Recall and Fault Memory Clear

Procedures for recalling diagnostic codes and clearing fault memory.

Error Code Recall and Status

Error Code Recall Mode Operations

Steps to enter and exit error code recall mode and clear stored errors.

Air Handler Error Code List

Comprehensive list of error codes and their corresponding status of the air handler.

Air Handler Jumpers

Humidification and Even Heat Jumper Settings

Explains jumper settings for humidification modes and EvenHeat target temperatures.

Blower Speed Selection Jumpers

How to use jumpers to select indoor blower CFM for continuous, heat, and cool operations.

Blower Adjustment and Delay Profiles

Blower Adjustment Settings

How to use jumpers to adjust indoor blower CFM speed (NORM, +, -).

Indoor Blower Delay Profiles

Details on Delay Profiles 1, 2, 3, and 4 for cooling and heat pump operations.

Unit Operating Sequences

Single-Stage Outdoor Unit Sequences

Operating sequences with ComfortSense 7500 and single-stage outdoor units.

Two-Stage Outdoor Unit Sequences

Operating sequences with ComfortSense 7500 and two-stage outdoor units.

Unit Configuration and Checkout

Configuring Unit Settings

Requirements for configuring unit size, heat mode, and EvenHeat for non-communicating systems.

Air Handler Control Checkout

Checkout procedure for verifying unit size code, heat sections, and heat mode.

Configure Unit Size Codes

Electric Heat Configuration

Detecting Electric Heat Sections

Procedure for automatically detecting and configuring electric heat sections.

Heat Mode Selection (Standard vs. EvenHeat)

Guide to selecting between Standard and EvenHeat modes for electric heating.

EvenHeat Operation

EvenHeat Inputs and Outputs

Table mapping thermostat demands to target discharge air temperatures for EvenHeat.

EvenHeat Operation Flow

Detailed flowchart explaining the logic and sequence of EvenHeat operation.