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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 6 – Opening Dimensions - In. (mm) . . . . . . . . . . . . . . . . . 18
FILTER ARRANGEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 7 – Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c.
(Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 8 – Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c.
(Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 9 – Filter Media Pressure Drop (Clean) Versus Face Velocity-
in. w.c. (Pa) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 10 – Air Filter Selection and Duct Sizing - In. (mm) . . . . 20
AIR DUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GAS PIPING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 11 – Maximum Capacity of Pipe . . . . . . . . . . . . . . . . . . . . 23
ELECTRICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 12 – Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
ACCESS0RIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 13 – Vent Termination Kit for Direct Vent (2-pipe) Systems29
Table 14 – Approved Combustion-Air and Vent Pipe, Fitting and Ce-
ment Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 15 – Maximum Equivalent Vent Length . . . . . . . . . . . . . . 38
Table 16 – Deductions from Maximum Equivalent Vent Length - Ft.
(M) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 17 – Maximum Allowable Exposed Vent Lengths in Uncondi-
tioned Space Table - Ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 18 – Hanger Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
AIR DELIVERY - CFM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 19 – Air Delivery - CFM (with filter) . . . . . . . . . . . . . . . . 47
Table 20 – Airflow Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
FURNACE CONTROL PROGRAMMING AND NAVIGATION 49
Table 21 – System Status Display Codes . . . . . . . . . . . . . . . . . . 50
Table 22 – Main Menu Options. . . . . . . . . . . . . . . . . . . . . . . . . . 50
SERVICE LABEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
START-UP, ADJUSTMENT, AND SAFETY CHECK . . . . . . . . . 52
Table 23 – Test Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 24 – Altitude Derate Multiplier for U.S.A. . . . . . . . . . . . . 55
Table 25 – Gas Rate (CU ft./hr). . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 26 – Orifice Size and Manifold Pressure (in. w.c.) for Gas Input
Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
SERVICE AND MAINTENANCE PROCEDURES. . . . . . . . . . . . 58
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
WINTERIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
PARTS REPLACEMENT INFORMATION GUIDE . . . . . . . . . . . 71
MODEL NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
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/45/ or use the QR code below.
A220944
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.
N92MSN
Single-Stage, 35-in. (889 mm) Tall, 4-Way Multipoise
High Efficiency 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 .
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