Printed in U.S.A. 440 04 4402 06 8/11/2017
SERVICE AND TECHNICAL
SUPPORT MANUAL
Single Stage, PSC Blower Motor
35” Tall, High Efficiency Condensing Gas Furnace
N9MSE (A Series)
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Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE
The signal words DANGER, WARNING,
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.
DANGER − Immediate hazards which will result in
severe personal injury or death.
WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
!
WARNING
Signal Words in Manuals
The signal word CAUTION is used throughout
this manual in the following manner:
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
The signal word WARNING is used throughout
this manual in the following manner:
Safety−alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
TABLE OF CONTENTS
START−UP CHECK SHEET 3...............................
START−UP, ADJUSTMENT, AND SAFETY CHECK 4...........
PRIME CONDENSATE TRAP WITH WATER 4.................
PURGE GAS LINES 4......................................
CHECK INLET GAS PRESSURE 6...........................
ADJUST MANIFOLD PRESSURE 6..........................
GAS RATE (CU FT./HR) 9...................................
ORIFICE SIZE AND MANIFOLD PRESSURE 10...............
ADJUST TEMPERATURE RISE 13............................
ADJUST BLOWER OFF DELAY 14............................
ADJUST COOLING AIRFLOW 14.............................
ADJUST THERMOSTAT HEAT ANTICIPATOR 14...............
CHECK SAFETY CONTROLS 14.............................
CHECKLIST 14.............................................
COOLING AIR DELIVERY 15.................................
SERVICE AND MAINTENANCE PROCEDURES 16.............
HEATING AND COOLING APPLICATION WIRING DIAGRAM 17..
RETRIEVING STORED FAULT CODES 17.....................
COMPONENT SELF−TEST 17...............................
CARE AND MAINTENANCE 18...............................
CLEANING AND/OR REPLACING AIR FILTER 18..............
BLOWER MOTOR AND WHEEL MAINTENANCE 18............
CLEANING BURNERS AND FLAME SENSOR 20...............
SERVICING HOT SURFACE IGNITER 21......................
FLUSHING COLLECTOR BOX AND DRAINAGE SYSTEM 21....
CLEANING CONDENSATE DRAIN AND TRAP 22..............
CLEANING HEAT EXCHANGERS 22..........................
WINTERIZATION 23........................................
SERVICE LABEL 24.........................................
WIRING DIAGRAM 25.......................................
TROUBLESHOOTING − FLOW CHART 26....................
SEQUENCE OF OPERATION 28.............................
PARTS REPLACEMENT INFORMATION GUIDE 29.............
PRODUCT NOMENCLATURE 30.............................
MODELS
N9MSE0261408A
N9MSE0401410A
N9MSE0401712A
N9MSE0601410A
N9MSE0601714A
N9MSE0801716A
N9MSE0802120A
N9MSE1002114A
N9MSE1002120A
N9MSE1202420A
N9MSE1402420A
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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