ICP N9MSB1002120C User Manual

27 pages

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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 .

Questions and Answers:

A
Ashley GreerAug 6, 2025
How to fix an ignition proving failure on my ICP N9MSB1002120C?
- T
  Teresa OsborneAug 6, 2025
  If your ICP furnace fails to sense the flame during ignition, check the following: Ensure the gas valve is turned on, the manual shut-off valve is open, the Green/Yellow wire is securely connected to the furnace sheet metal, and the flame sensor is not grounded.
E
Edward ColemanAug 21, 2025
What to do if the pressure switch did not open in my ICP N9MSB1002120C?
- M
  Michael BurkeAug 21, 2025
  If the pressure switch on your ICP furnace doesn't open, check for several potential issues: Ensure proper vent sizing, verify low inlet gas pressure (if LGPS is used), and inspect for disconnected or obstructed pressure tubing.