Installation, Start–Up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
Table 1 – Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCE-
DURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
AIR FOR COMBUSTION AND VENTILATION . . . . . . . . . . . . . . 7
Table 2 – Minimum Free Area Required for Each Combustion Air
Opening or Duct to Outdoors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3 – Minimum Space Volumes for 100% Combustion, Ventila-
tion, and Dilution from Indoors . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4 – Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 11
FILTER ARRANGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 5 – Maximum Capacity of Pipe* . . . . . . . . . . . . . . . . . . . . 14
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 6 – Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 7 – Combined Appliance Maximum Input Rating
in Thousands of BTUh per Hour . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 8 – Minimum Allowable Input Rating of Space-Heating Appli-
ance in Thousands of BTUh per Hour . . . . . . . . . . . . . . . . . . . . . 20
AIR DELIVERY - CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 9 – Air Delivery - CFM (with filter)* . . . . . . . . . . . . . . . . 24
Table 10 – Airflow Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
FURNACE CONTROL PROGRAMMING
AND NAVIGATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 11 – System Status Display Codes. . . . . . . . . . . . . . . . . . . 29
Table 12 – Main Menu Options . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
START-UP, ADJUSTMENT, AND SAFETY CHECK . . . . . . . . . 31
Table 13 – Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 14 – Altitude Derate Multiplier for U.S.A. . . . . . . . . . . . . 33
Table 15 – Gas Rate (Cu Ft./Hr.) . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 16 – Orifice Size* and Manifold Pressure (in. w.c.) for Gas Input
Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 17 – Orifice Size* And Manifold Pressure (in. w.c.) for Gas In-
put Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 36
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 18 – Filter Size Information (In. / mm) . . . . . . . . . . . . . . . 38
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 46
MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
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/42/ or use the QR code below.
A220931
A200115
Most states in the USA and jurisdictions in Canada have laws that
require the use of Carbon Monoxide (CO) alarms with fuel burning
products. Examples of fuel burning products are furnaces, boilers, space
heaters, generators, water heaters, stoves/ranges, clothes dryers,
fireplaces, incinerators, automobiles, and other internal combustion
engines. Even if there are no laws in your jurisdiction requiring a CO
Alarm, it’s highly recommended that whenever any fuel burning product
is used in or around the home or business that the dwelling be equipped
with a CO Alarm(s). The Consumer Product Safety Commission
recommends the use of CO Alarm(s). The CO Alarm(s) must be
installed, operated, and maintained according to the CO Alarm
manufacturer’s instructions. For more information about Carbon
Monoxide, local laws, or to purchase a CO Alarm online, please visit the
following website. https://www.kidde.com.
Portions of the text and tables are reprinted from current edition of 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.
N80MSN/N80MSL
80% AFUE, Single-Stage, Multi-Speed ECM,
4-Way Multipoise, Non–Condensing Gas Furnace
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury and/or
death.
Carbon Monoxide (CO) is a colorless, odorless, and tasteless poisonous
gas that can be fatal when inhaled. Follow all installation, maintenance,
and service instructions. See additional information below regarding
the installation of a CO Alarm.
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