Printed in U.S.A.
440 04 4413 00
3/25/2014
SERVICE AND TECHNICAL
SUPPORT MANUAL
Single Stage, PSC Blower Motor
35” Tall, High Efficiency Condensing Gas Furnace
N9MSB (C Series)
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
START
−
UP CHECK SHEET FOR PSC MOTOR
3
. . . . . . . . . . . . . .
START
−
UP, ADJUSTMENT, AND SAFETY CHECK
4
. . . . . . . . . . .
PRIME CONDENSATE TRAP WITH WATER
4
. . . . . . . . . . . . . . . . .
PURGE GAS LINES
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUST TEMPERATURE RISE
10
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUST BLOWER OFF DELAY (HEAT MODE)
11
. . . . . . . . . . . . . .
ADJUST COOLING AIRFLOW
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ADJUST THERMOSTAT HEAT ANTICIPATOR
11
. . . . . . . . . . . . . . .
CHECK SAFETY CONTROLS
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COOLING AIR DELIVERY - CFM
12
. . . . . . . . . . . . . . . . . . . . . . . . . . .
CHECKLIST
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE AND MAINTENANCE PROCEDURES
13
. . . . . . . . . . . . .
RETRIEVING STORED FAULT CODES
14
. . . . . . . . . . . . . . . . . . . . .
COMPONENT SELF
−
TEST 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CARE AND MAINTENANCE
15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLEANING AND/OR REPLACING AIR FILTER
15
. . . . . . . . . . . . . .
BLOWER MOTOR AND WHEEL MAINTENANCE
15
. . . . . . . . . . . .
CLEANING BURNERS AND FLAME SENSOR
17
. . . . . . . . . . . . . . .
SERVICING HOT SURFACE IGNITER
18
. . . . . . . . . . . . . . . . . . . . . .
FLUSHING COLLECTOR BOX AND DRAINAGE SYSTEM
18
. . . .
CLEANING CONDENSATE DRAIN AND TRAP
19
. . . . . . . . . . . . . .
CLEANING HEAT EXCHANGERS
19
. . . . . . . . . . . . . . . . . . . . . . . . . .
WINTERIZATION
20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE LABEL
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WIRING DIAGRAM
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING GUIDE
−
FLOW CHART
23
. . . . . . . . . . . . . .
SEQUENCE OF OPERATION
25
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS REPLACEMENT INFORMATION GUIDE
26
. . . . . . . . . . . . .
PRODUCT NOMENCLATURE
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODELS
N9MSB0401410C
N9MSB0401712C
N9MSB0601412C
N9MSB0601716C
N9MSB0801716C
N9MSB0802120C
N9MSB1002116C
N9MSB1002120C
N9MSB1202420C
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 .
