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Lennox SIGNATURE SLP99DFV

Lennox SIGNATURE SLP99DFV
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Page 1
INSTALLATION
INSTRUCTIONS
SLP99DFV
508001-02
10/2021
Supersedes 08/2021
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.
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
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.
NOTICE
A thermostat is not included and must be ordered
separately.
A communicating thermostat must be used in
communicating applications.
In non-communicating applications, the Lennox
ComfortSense
®
7500 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 35.
©
2021 Lennox Industries Inc.
Dallas, Texas USA
DAVE LENNOX SIGNATURE
®
COLLECTION GAS FURNACES
DOWNFLOW AIR DISCHARGE
Contents
Unit Dimensions - inches (mm) ......................................2
Parts Arrangement..........................................................3
SLP99DFV Gas Furnace ................................................4
Shipping and Packing List ..............................................4
Safety Information ..........................................................4
Building Codes ...............................................................4
Use of Furnace as Construction Heater .........................5
General ...........................................................................6
Installation - Setting Equipment ......................................6
Filters ..............................................................................9
Duct System ...................................................................9
Pipe & Fittings Specications ....................................... 11
Venting Options ............................................................13
Joint Cementing Procedure .......................................... 14
Venting Pracitces ..........................................................15
Gas Piping ....................................................................30
Electrical .......................................................................33
Integrated Control .........................................................41
Blower Data ..................................................................45
Unit Start-Up .................................................................50
Turning O󰀨 Gas to Unit .................................................51
High Altitude Information ..............................................51
Gas Pressure Measurement.........................................51
Proper Combustion.......................................................51
Heating Sequence of Operation ...................................54
Service..........................................................................56
Repair Parts..................................................................57
Integrated Control Diagnostic Codes............................58
Conguring Unit Size Codes ........................................61
Troubleshooting: Heating Sequence of Operation .......62
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Lennox SIGNATURE SLP99DFV Specifications

General IconGeneral
ModelSLP99DFV
TypeGas Furnace
Efficiency RatingUp to 99% AFUE
StagesModulating
Blower MotorVariable speed
Fuel TypeNatural Gas
Warranty10-Year Limited Warranty on covered components; Limited Lifetime Warranty on heat exchanger

Summary

Installation Manual Contents Overview

Unit Dimensions and Physical Specifications

Details the physical measurements and key dimensions of the furnace unit.

Furnace Parts Arrangement Overview

Illustrates and labels the main components and their locations within the furnace.

SLP99 DFV Gas Furnace Features

Describes the furnace's variable-capacity, variable-speed integrated control and its capabilities.

Furnace Safety Information and Precautions

Outlines critical safety warnings and cautions for installation and operation.

Furnace Installation with Cooling Coil

Provides guidelines for installing the furnace in conjunction with a cooling coil to prevent condensation.

Furnace Use as Construction Heater Guidelines

Specifies conditions and criteria for using the furnace as a temporary construction heater.

General Furnace Installation Guidelines

Offers general recommendations for furnace placement and installation considerations.

Furnace Installation and Equipment Setup

Details critical steps and warnings for setting up the furnace equipment correctly.

Furnace Installation on Non-Combustible Floors

Provides instructions for installing the furnace on non-combustible flooring.

Furnace Installation on Combustible Floors

Details installation requirements for mounting the furnace on combustible flooring.

Furnace Installation on Cooling Coil Cabinets

Describes how to install the furnace on a cooling coil cabinet.

Downflow Unit Return Air Opening Setup

Explains how to properly connect the return air opening for downflow unit installations.

Furnace Filter Requirements and Selection

Specifies filter requirements and provides guidance on selecting the correct filter size.

Discharge Air Temperature Sensor Installation

Details the installation and purpose of the discharge air temperature sensor.

Vent Pipe and Fittings Specifications

Lists approved materials and specifications for vent piping and associated fittings.

Furnace Venting Options and Configurations

Explains how to configure venting options, including side venting.

Vent Pipe Joint Cementing Procedure

Provides detailed steps for properly cementing vent pipe joints using solvent cement.

Vent Pipe Practices and Guidelines

Outlines best practices and guidelines for vent pipe installation and routing.

Vent Pipe Sizing Process and Calculations

Describes the process and factors involved in determining the correct vent pipe size.

Flue Coupling Installation Procedure

Details the steps for attaching the flue coupling to the furnace top panel.

Right Side Vent Exhaust Connections

Illustrates typical exhaust pipe connections for right side vent configurations.

Right Side Vent Air Intake Connections

Illustrates typical air intake pipe connections for right side vent configurations.

Vent Termination Clearances and Requirements

Specifies required clearances for vent terminations in USA and Canada installations.

Crawl Space and Extended Horizontal Venting

Provides guidance for venting through crawl spaces and extended horizontal runs.

Vent Termination General Guidelines

Offers general advice and considerations for direct vent termination locations and clearances.

Direct Vent Intake and Exhaust Termination Details

Details specific requirements and configurations for direct vent intake and exhaust piping terminations.

Concentric Rooftop Vent Termination

Illustrates concentric rooftop termination kits and their installation requirements.

Concentric Wall Vent Termination

Illustrates concentric wall termination kits and their installation requirements.

Direct Vent Application Using Existing Chimney

Describes how to apply direct vent configurations when using an existing chimney.

Field Fabricated Wall Vent Termination

Provides dimensions and guidelines for field-fabricated wall vent terminations.

Alternate Vent Terminations (Tee & 45 Elbows)

Details alternative vent termination methods using tee and 45-degree elbows.

Condensate Piping Installation and Routing

Provides instructions for installing the condensate trap and piping for proper drainage.

Furnace & Evaporator Coil Separate Drain Setup

Illustrates separate drain configurations for furnace and evaporator coil.

Furnace & Evaporator Coil Common Drain Setup

Illustrates common drain configurations for furnace and evaporator coil.

Condensate TrapDrain Assembly with PVC Piping

Details the assembly of condensate traps and drain lines using 1/2" or 3/4" PVC piping.

Gas Piping Installation and Connections

Covers essential safety warnings, torque specifications, and routing for gas piping.

Gas Piping Leak Detection Procedure

Explains how to perform a leak check on all field-installed gas piping connections.

Furnace Removal from Common Vent System

Provides safety warnings and procedures for removing a furnace from a common vent system.

Electrical Connections and Safety Precautions

Details electrical safety, wiring requirements, grounding, and circuit breaker sizing.

Thermostat Selection and Configuration

Guides the selection and setup of compatible thermostats for optimal furnace operation.

Indoor Blower Speed Settings

Explains how to set and adjust indoor blower speeds for heating and cooling modes.

Communicating System Wiring Diagram (Non-Communicating Outdoor)

Illustrates wiring connections for a communicating furnace with a non-communicating outdoor unit.

Communicating System Wiring Diagram (Communicating Outdoor)

Illustrates wiring connections for a communicating furnace with a communicating outdoor unit.

Optional Accessories for Communicating Systems

Shows wiring diagrams for optional accessories used with communicating systems.

Non-Communicating Thermostat Wiring Connections

Details field wiring connections for non-communicating thermostat applications.

Non-Communicating Thermostat Wiring (Continued)

Continues detailing field wiring connections for non-communicating thermostat applications.

Non-Communicating Thermostat Wiring for Dual Fuel

Details thermostat wiring for dual fuel heat pump applications.

Integrated Control Board Overview and Terminals

Explains the integrated control board, its features, and terminal connections.

Non-Communicating Thermostat Switch Settings

Provides DIP switch settings for non-communicating thermostats based on furnace operation.

Heating Operation DIP Switch Settings

Details DIP switch settings for controlling heating operation modes and blower speeds.

Cooling Mode Blower Speed Settings

Explains DIP switch settings for controlling blower speeds during cooling operation.

Cooling Mode Blower Speed Adjustment

Guides on adjusting blower speed in cooling mode using DIP switches.

Cooling Mode Blower Speed Ramping Options

Describes different blower speed ramping profiles for cooling mode to enhance dehumidification.

Heating Mode Blower Speed Adjustments

Details DIP switch adjustments for low and high heat blower motor speeds.

On-Board Link W914 (DS to R) Configuration

Explains the function and configuration of the W914 on-board link for humidity control.

On-Board Link W951 (R to O) Configuration

Explains the function and configuration of the W951 on-board link for heat pump applications.

Blower Performance Data (070 XV36 B Model)

Provides detailed blower performance data for the 070XV36B model in heating and cooling.

Blower Performance Data (090 XV36 C Model)

Provides detailed blower performance data for the 090XV36C model in heating and cooling.

Blower Performance Data (090 XV48 C Model)

Provides detailed blower performance data for the 090XV48C model in heating and cooling.

Blower Performance Data (090 XV60 C Model)

Provides detailed blower performance data for the 090XV60C model in heating and cooling.

Blower Performance Data (110 XV60 C Model)

Provides detailed blower performance data for the 110XV60C model in heating and cooling.

Cooling Operating Sequence (Single-Stage Outdoor Unit)

Details the cooling operating sequence with a single-stage outdoor unit.

Cooling Operating Sequence (Two-Speed Outdoor Unit)

Details the cooling operating sequence with a two-speed outdoor unit.

Unit Start-Up Procedures and Safety

Provides essential safety warnings and steps for starting up the furnace unit.

Condensate Trap Priming Procedure

Explains how to prime the condensate trap to ensure proper drainage.

Gas Pressure Measurement and Testing

Details how to measure gas pressure and perform checks for proper combustion.

Checking Proper Combustion Parameters

Outlines procedures for checking CO levels and comparing them to table values.

Manifold Pressure Measurement Procedure

Describes how to measure manifold gas pressure using test adapter kits.

Operating Pressure Signal (Delta P) Measurement

Explains how to measure the operating pressure signal (Delta P) for furnace calibration.

Primary Limit Switch Function

Describes the location and factory setting of the primary limit control.

Pressure Switch Function and Installation

Details the location and importance of pressure switches for combustion safety.

Temperature Rise Adjustment for Blower Speed

Guides on checking and adjusting temperature rise by modifying blower speed.

Two-Stage Thermostat Heating Sequence

Outlines the heating sequence when using a two-stage thermostat.

Single-Stage Thermostat Heating Sequence

Outlines the heating sequence when using a single-stage thermostat.

General Service and Maintenance Precautions

Provides critical safety warnings and general procedures for servicing the furnace.

Annual Furnace Maintenance Checklist

Lists recommended maintenance tasks to be performed annually for the furnace.

Burner Assembly Cleaning Procedure

Details the steps for cleaning the burner assembly and inspecting for blockages.

Furnace Repair Parts List

Lists available replacement parts for various furnace components.

Integrated Control Diagnostic Codes Overview

Explains how to access and interpret diagnostic codes displayed by the integrated control.

Integrated Control Diagnostic Codes (Part 2)

Lists and explains additional diagnostic codes for the integrated control system.

Integrated Control Diagnostic Codes (Part 3)

Lists and explains further diagnostic codes for the integrated control system.

Configuring Furnace Unit Size Codes

Guides on how to configure the furnace control with the correct unit size code.

Troubleshooting Heating Sequence of Operation

Provides flowcharts and guidance for troubleshooting heating sequence issues.

Troubleshooting High Fire Call (Two-Stage Thermostat)

Details troubleshooting steps for high fire calls with a two-stage thermostat.

Troubleshooting High Fire Call (Two-Stage Thermostat) - Continued

Continues troubleshooting steps for high fire calls with a two-stage thermostat.

Troubleshooting IgnitionHeat Call (Single-Stage Thermostat)

Provides troubleshooting for ignition and heat calls with single-stage thermostats.

Troubleshooting Cooling Sequence of Operation

Offers guidance for troubleshooting cooling sequence operations.

Continuous Low Speed Indoor Blower Operation

Details the sequence of operation for continuous low-speed indoor blower operation.

Massachusetts Specific Installation Requirements

Lists specific installation requirements mandated by the Commonwealth of Massachusetts.

Ontario Horizontal Sidewall Vent Applications

Provides specific guidelines for horizontal sidewall venting applications in Ontario.

Canadian Venting Addendum and Termination Guide

Offers venting guidelines and termination approvals for all Canadian provinces.

Typical Unit Set-Up Checklist

Provides a checklist for typical unit set-up procedures including gas, venting, and electrical checks.

Unit Operation: Heating Mode Checks

Details operational checks and measurements required during heating mode.

Unit Operation: Cooling Mode Checks

Details operational checks and measurements required during cooling mode.

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