Printed in U.S.A.
440 04 4413 03
10/15/2018
SERVICE AND TECHNICAL
SUPPORT MANUAL
Single Stage, PSC Blower Motor
35” Tall, High Efficiency Condensing Gas Furnace
N9MSB
Save this manual for future reference.
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
UP, ADJUSTMENT, AND SAFETY CHECK
PRIME CONDENSATE TRAP WITH WATER
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUST BLOWER OFF DELAY (HEAT MODE)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUST THERMOSTAT HEAT ANTICIPATOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE AND MAINTENANCE PROCEDURES
. . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLEANING AND/OR REPLACING AIR FILTER
BLOWER MOTOR AND WHEEL MAINTENANCE
CLEANING BURNERS AND FLAME SENSOR
. . . . . . . . . . . . . . . . . . . . . .
FLUSHING COLLECTOR BOX AND DRAINAGE SYSTEM
CLEANING CONDENSATE DRAIN AND TRAP
. . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS REPLACEMENT INFORMATION GUIDE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODELS
N9MSB0401410
N9MSB0401712
N9MSB0601412
N9MSB0601716
N9MSB0801716
N9MSB0802120
N9MSB1002116
N9MSB1002120
N9MSB1202420
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 .