Carrier N96MSN User Manual

Installation, Start-up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
REQUIRED NOTICE FOR MASSACHUSETTS INSTALLATIONS
IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 1 – Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2 – Minimum Clearances to Combustible Materials
for All Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3 – Loose Parts Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CODES AND STANDARDS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCE-
DURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
AIR FOR COMBUSTION AND VENTILATION . . . . . . . . . . . . . . 8
Table 4 – Minimum Free Area Required for Each Combustion Air
Opening or Duct to Outdoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5 – Minimum Space Volumes for 100% Combustion, Ventila-
tion and Dilution Air from Outdoors . . . . . . . . . . . . . . . . . . . . . . . 9
CONDENSATE TRAP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CONDENSATE DRAIN CONNECTION . . . . . . . . . . . . . . . . . . . . 13
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 6 – Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 18
FILTER ARRANGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 7 – Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c.
(Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 8 – Filter Media Pressure Drop (Clean) Versus Face Velocity-
in. w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 9 – Air Filter Selection and Duct Sizing - In. (mm) . . . . . 21
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 10 – Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 23
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 11 – Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ACCESSORIES (See Fig. 37) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 12 – Vent Termination Kit for Direct Vent (2-pipe) Systems29
Table 13 – Approved Combustion-Air and Vent Pipe, Fitting and Ce-
ment Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Table 14 – Maximum Equivalent Vent Length - Ft. . . . . . . . . . . 40
Table 15 – Deductions from Maximum Equivalent Vent Length - Ft.
(M) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 16 – Maximum Allowable Exposed Vent Length in Uncondi-
tioned Space - Ft. / M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 17 – Hanger Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
AIR DELIVERY - CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 18 – Air Delivery - CFM (with filter) . . . . . . . . . . . . . . . . 48
Table 19 – Airflow Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
FURNACE CONTROL PROGRAMMING
AND NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 20 – System Status Display Codes . . . . . . . . . . . . . . . . . . 52
Table 21 – Main Menu Options. . . . . . . . . . . . . . . . . . . . . . . . . . 53
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
START-UP, ADJUSTMENT, AND SAFETY CHECK . . . . . . . . . 55
Table 22 – Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 23 – Altitude Derate Multiplier for U.S.A. . . . . . . . . . . . . 58
Table 24 – Gas Rate (CU ft./hr). . . . . . . . . . . . . . . . . . . . . . . . . . 59
Table 25 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input
Rate - 40,000 BTUh to 140,000 BTUh . . . . . . . . . . . . . . . . . . . . 60
Table 26 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input
Rate - 26,000 BTUh ONLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 62
ELECTRICAL CONTROLS AND WIRING . . . . . . . . . . . . . . . . . 62
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
WINTERIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
TROUBLSHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 74
MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
To learn more about this appliance and installation via a mobile device,
go to http://www.fasthvacrparts.com/NFC or use the QR code below. To
access airflow tables or troubleshooting guide on your mobile device go
to mlctraining.com/training/techdocs/44/ or use the QR code below.
A220937
A200326
Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1E, with permission of National Fire Protection Association, Quincy, MA
02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI
on the referenced subject, which is represented only by the standard in its entirety.
N96MSN
Single-Stage, High Efficiency, 4-Way Multipoise
35-in. (889 mm), Condensing Gas Furnace
Use of the AHRI Certified TM Mark indicates
a manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .

Carrier N96MSN Specifications

General

AFUE	96%
Fuel Type	Natural gas
Blower Motor	ECM
Vent Size	2" or 3"
Warranty	10-year parts limited warranty

Summary

Required Notice for Massachusetts Installations

Massachusetts Specific Installation Requirements

Details mandatory safety and installation regulations specific to Massachusetts.

Safety Considerations

General Hazard Warnings

Critical warnings for fire, explosion, electrical shock, and personal injury.

Introduction to Installation and Operation

Important Installation and Start-Up Procedures

Key steps for initial setup and startup to prevent issues and ensure proper operation.

Codes and Standards Compliance

Installation Precautions and Location

Electrostatic Discharge (ESD) Precautions

Procedures to prevent electronic component damage from static discharge.

Furnace Location Requirements

Guidelines for selecting a suitable and safe installation location for the furnace.

Air for Combustion and Ventilation

Combustion Air Supply Methods

Explains direct vent, 1-pipe, and ventilated air supply options for combustion.

Indoor Combustion Air Considerations

Details on using indoor air for combustion based on air infiltration rates.

Condensate Management

Condensate Trap Configuration and Drainage

Instructions for installing and configuring the condensate trap in various orientations.

Condensate Drain Connection

Drain Connection Orientations and Methods

Procedures for connecting the condensate drain line in upflow, downflow, and horizontal setups.

Installation Procedures

Upflow Installation Guidelines

Specific steps for installing the furnace in an upflow orientation.

Supply and Return Air Duct Connections

Guidelines for connecting supply and return air ductwork.

Side Return Air Inlet Configuration

Instructions for utilizing side return air openings.

Filter Arrangement and Maintenance

Air Filter Installation and Replacement

Instructions for installing, cleaning, or replacing the external air filter.

Air Ducts and Gas Piping

Air Duct Design and Requirements

Guidelines for sizing and installing air duct systems according to standards.

Gas Piping Installation Procedures

Instructions for safely installing the gas supply piping.

Electrical Connections

115-V and 24-V Wiring Guide

Instructions for connecting power supply and low-voltage thermostat wiring.

J-Box and External Wiring Installation

Guidelines for using junction boxes and external electrical boxes for wiring.

Venting System Installation

Venting System Types and Requirements

Details on direct vent, ventilated, and non-direct vent systems and their requirements.

Vent Termination Clearances and Locations

Rules for positioning vent terminations and required clearances from structures.

Locating and Sizing Vent Pipes

Venting System Length Calculations

Furnace Configuration and Piping

Combustion Air and Vent Piping Insulation

Guidelines for insulating vent and combustion air pipes in unconditioned spaces.

Furnace Piping Installation Procedures

Steps for installing vent pipe adapters and connecting furnace piping, including elbow usage.

Vent Pipe Adapter Installation

Installing the Vent Termination

Roof and Sidewall Termination Guidelines

Procedures for terminating vents on roofs and sidewalls, including clearances.

Venting System Length Calculations Example

Furnace Control Programming and Navigation

On-Board Control Method

Using the control panel's display and buttons for settings and diagnostics.

Mobile App and NFC Connectivity

Utilizing mobile devices for advanced control and diagnostics via NFC.

Control Board Replacement Procedures

Steps and precautions for replacing the furnace control board.

Service Label and Menu Navigation

Understanding status codes, menu options, and navigating the control interface.

Start-Up, Adjustment, and Safety Checks

General Start-Up Procedures

Essential steps before and during initial furnace startup to ensure proper operation.

Detailed Start-Up Procedures

Step-by-step instructions for performing initial startup and safety checks.

Wiring Diagram and Condensate Trap Priming

Wiring Diagram Overview

Visual guide to furnace electrical connections and component identification.

Condensate Trap Priming Procedure

Instructions for priming the condensate trap to prevent operational issues.

Adjustments and Gas Pressure Checks

Gas Line Purging and Leak Checks

Procedures for purging gas lines and checking for leaks to ensure safety.

Inlet Gas Pressure Verification

How to measure and verify incoming gas pressure for correct operation.

Manifold Pressure Adjustment

Steps for setting the correct manifold pressure for optimal furnace performance.

Temperature Rise Adjustment

Heating Blower-Off Delay Adjustment

Safety Control Verification

Service and Maintenance Procedures

General Furnace Maintenance Tasks

Routine maintenance checks and cleaning recommendations for overall furnace health.

Air Filter Installation and Replacement

Instructions for installing, cleaning, or replacing the external air filter.

Blower Motor and Wheel Maintenance

Burner and Flame Sensor Cleaning

Servicing the Hot Surface Igniter

Collector Box and Drainage System Flushing

Condensate Drain and Trap Cleaning

Heat Pad Operation Check

Heat Exchanger Cleaning and Servicing

Primary Heat Exchangers

Steps for cleaning primary heat exchangers to maintain efficiency.

Winterization and Sequence of Operation

Furnace Winterization Procedures

Steps to protect the furnace from freezing temperatures when it's not in use.

Furnace Sequence of Operation

How the furnace operates in different modes like heating, cooling, and continuous fan.

Troubleshooting Furnace Operation

Troubleshooting Flowchart and Status Codes

Gas Furnace Installation Checklist

Gas Adjustment and Firing Rate Recording

Recording gas settings, heat content, specific gravity, and firing rates.

Venting System Specifications Documentation

Documenting vent pipe diameter, length, termination type, and connector details.

Parts Replacement Information

Parts Identification and Groups

Identifying furnace components by group and understanding model nomenclature for parts.