International comfort products N9MSB Service And Technical Support Manual
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International comfort products N9MSB Service And Technical Support Manual

Single stage, psc blower motor 35” tall, high efficiency condensing gas furnace
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35" Tall, High Efficiency Condensing Gas Furnace
DANGER, WARNING, CAUTION, and NOTE
The
signal
words
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.

TABLE OF CONTENTS

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Printed in U.S.A.
SERVICE AND TECHNICAL
SUPPORT MANUAL
Single Stage, PSC Blower Motor
N9MSB (B Series)
Save this manual for future reference.
Safety Labeling and Signal Words
DANGER,
WARNING,
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Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
WARNING
!
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.
Safety−alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
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4
N9MSB0401410B
4
10
N9MSB0401712B
11
N9MSB0601412B
11
N9MSB0601716B
11
N9MSB0801716B
11
N9MSB0802120B
12
13
N9MSB1002116B
14
N9MSB1002122B
14
N9MSB1202422B
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MODELS
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 .
440 04 4412 03
12/5/2013

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  • Page 1: Table Of Contents

    SERVICE AND TECHNICAL SUPPORT MANUAL Single Stage, PSC Blower Motor 35” Tall, High Efficiency Condensing Gas Furnace N9MSB (B Series) Save this manual for future reference. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals...
  • Page 2 SAFETY CONSIDERATIONS WARNING Improper ins t allation, adjus t ment, alteration, serv ic e, maintenance, or use can cause explosion, fire, electrical shock, PERSONAL INJURY, AND/OR PROPERTY DAMAGE or other conditions which may cause death, personal injury, or HAZARD property damage. Consult a qualified installer, service agency, Failure to carefully read and follow this warning could or your distributor or branch for information or assistance.
  • Page 3 SERVICE AND TECHNICAL MANUAL Gas Furnace: N9MSB START−UP CHECK SHEET For PSC Models N9MSB (This sheet is optional. Keep for future reference.) Date of Start−Up: Calculated Input (BTU) Rate: (See Checks and Adjustments Section). Dealer Name: Heating Check Address: Measured Line Pressure During Heat:...

  • Page 4: Start−Up, Adjustment, And Safety Check

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB START−UP, ADJUSTMENT, AND SAFETY 2. Connect field-supplied 5/8-in. (16 mm) ID tube with attached funnel (see Figure 1) to upper collector box CHECK drain connection. 3. Pour one quart (liter) of water into funnel/tube. Water...
  • Page 5 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB higher altitudes or different gas heat contents, it may be CAUTION necessary to change the factory orifice to a different orifice. Tables have been provided in the furnace Service and FURNACE DAMAGE HAZARD Technical Manual to match the required orifice to the manifold pressure to the heat content and specific gravity of the gas.
  • Page 6 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Check Inlet Gas Pressure burner flame should be clear blue, almost transparent (See Figure 13) The inlet gas pressure must be checked with the furnace i. Remove jumper R to W. operating in maximum heat. This is necessary to make sure the...
  • Page 7 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 4 Example of Single Stage Furnace Control for PSC Blower Motor HEAT COMPONENT TEST J2 JUMPER OFF−DELAY TERMINAL 24−V THERMOSTAT TERMINALS HUMIDIFIER TERMINAL (24−VAC 0.5 AMP MAX) 24VAC TRANSFORMER 24−VAC CONNECTIONS 3−AMP FUSE...
  • Page 8 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Table 2 Gas Rate (CU ft./hr) SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 REVOLUTION FOR 1 REVOLUTION 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft.
  • Page 9 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Table 3 Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − Single Stage SINGLE-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)

  • Page 10: Adjust Temperature Rise

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Table 3 (CONT.) Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − Single Stage SINGLE-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL)

  • Page 11: Adjust Blower Off Delay (Heat Mode)

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB (Read following caution before changing taps). Figure 5 Amp. Draw Check with Ammeter CAUTION THERMOSTAT SUBBASE TERMINALS WITH THERMOSTAT REMOVED UNIT DAMAGE HAZARD (ANITICIPATOR, CLOCK, ETC., To avoid operating outside the rise range and avoid MUST BE OUT OF CIRCUIT.)

  • Page 12: Checklist

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB h. Blower will run for 90 seconds before beginning the 4. Verify that the blower (lower door in upflow position) and call for heat again. control (“Main” or upper door in upflow position) doors are properly installed.

  • Page 13: Service And Maintenanceprocedures

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB SERVICE AND MAINTENANCE General PROCEDURES These instructions are written as if the furnace is installed in an upflow application. An upflow furnace application is where the Untrained personnel can perform basic maintenance functions blower is located below the combustion and controls section of such as cleaning and replacing air filters.

  • Page 14: Retrieving Stored Fault Codes

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 7 Heating and Cooling Application Wiring Diagram with Single−Stage Thermostat FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 THERMOSTAT FIVE WIRE FIELD-SUPPLIED TERMINALS...

  • Page 15: Care And Maintenance

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Care and Maintenance 3. Check electrical connections for tightness and controls for proper operation each heating season. Service as necessary. WARNING 4. Inspect burner compartment before each heating season for rust, corrosion, soot or excessive dust. If necessary,...
  • Page 16 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 2. Remove blower door. Figure 8 Blower Assembly 3. All factory wires can be left connected, but field thermostat and accessory wiring may need to be MOTOR SHAFT FLAT disconnected depending on their length and routing.

  • Page 17: Cleaning Burners And Flame Sensor

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 14. Reinstall 2 screws securing blower assembly to blower 1. Disconnect power at external disconnect, fuse or circuit deck. breaker. 15. Reconnect blower leads to furnace control. Refer to 2. Turn off gas at external shut-off or gas meter.

  • Page 18: Servicing Hot Surface Igniter

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 5. Insert the orifices in the support rings of the burners. 14. Check for gas leaks with a commercially available soap solution made specifically for the detection of leaks. NOTE: If manifold does not fit flush against the burner, do not 15.

  • Page 19: Cleaning Condensate Drain And Trap

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 4. Remove the collector box plug from the top port on the 10. Turn power on at external disconnect, fuse or circuit upper corner of the collector box. (See Figure 1) breaker.

  • Page 20: Winterization

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Secondary Heat Exchangers Figure 12 Cleaning Heat Exchanger Cell The condensing side (inside) of the secondary heat exchanger CANNOT be serviced or inspected without complete removal of the heat exchanger assembly. Detailed information on heat exchanger removal can be obtained from your Distributor.

  • Page 21: Service Label

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 14 Service Label 338310−2 Rev F 440 04 4412 03 Specifications subject to change without notice.

  • Page 22: Wiring Diagram

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 15 Wiring Diagram 339241−2 Rev A 440 04 4412 03 Specifications subject to change without notice.

  • Page 23: Troubleshooting Guide − Flow Chart

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 16 Troubleshooting Guide − Flow Chart 440 04 4412 03 Specifications subject to change without notice.
  • Page 24 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 16 (CONT.) Troubleshooting Guide − Flow Chart L12F045 440 04 4412 03 Specifications subject to change without notice.

  • Page 25: Sequence Of Operation

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB SEQUENCE OF OPERATION period. The blower motor BLWM and air cleaner terminal EAC will remain energized for 90, 120, 150, or 180 NOTE: Furnace control must be grounded for proper operation seconds (depending on the heat−OFF delay selection).

  • Page 26: Parts Replacement Information Guide

    SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB PARTS REPLACEMENT INFORMATION GUIDE Casing Group Gas Control Group Control door Manifold Blower door Burner Top filler plate Orifice Bottom filler plate Flame sensor Door knob assembly Hot surface igniter Gas valve...

  • Page 27: Product Nomenclature

    16 = 1600 CFM (max) 20 = 2000 CFM (max) 22 = 2200 CFM (max) COOLING AIRFLOW SALES (MAJOR) REVISION DIGIT ENGINEERING (MINOR) REVISION DIGIT 440 04 4412 03 Specifications subject to change without notice. Copyright 2013 International Comfort Products...

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