Table of Contents
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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 (A 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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N9MSB0401410A
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N9MSB0601410A
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N9MSB0601714A
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N9MSB0801716A
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N9MSB0802120A
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N9MSB1002114A
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N9MSB1002120A
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N9MSB1202420A
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440 04 4411 03
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 .
Aug. 2012
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Table of Contents
Related Manuals for International comfort products N9MSB0401410A
Summary of Contents for International comfort products N9MSB0401410A
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Page 1: Table Of Contents
PRIME CONDENSATE TRAP WITH WATER ....N9MSB0401410A PURGE GAS LINES ........ - 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: City, State(Province), Zip or Postal Code: Measured Manifold Pressure: Heat...
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Page 4: Start−Up, Adjustment, And Safety Check
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB START−UP, ADJUSTMENT, AND SAFETY Figure 1 Priming Condensate Drain CHECK General 1. Furnace must have a 115-v power supply properly connected and grounded. NOTE: Proper polarity must be maintained for 115-v wiring. Control status indicator light flashes rapidly and furnace does not operate if polarity is incorrect or if the furnace is not grounded. - Page 5 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 4. Find closest natural gas heat value and specific gravity in Figure 2 Orifice Hole Table 3. Follow heat value and specific gravity lines to point of intersection to find orifice size and low-and high-heat manifold pressure...
- Page 6 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 4. Turn on furnace power supply. Redundant Automatic Gas Valve Figure 3 5. Turn gas supply manual shutoff valve to ON position. (Single Stage) 6. Turn furnace gas valve switch to ON position. ON/OFF Switch 7.
- Page 7 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 4 Example of Single Stage Furnace Control for PSC Blower Motor HEAT TWINNING AND/OR OFF DELAY COMPONENT TEST J2 JUMPER TERMINAL 24 V THERMOSTAT TERMINALS HUMIDIFIER TERMINAL (24 VAC 0.5 AMP MAX) 24VAC TRANSFORMER 24 VAC CONNECTIONS...
- 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. 2 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) ALTITUDE RANGE HEAT VALUE...
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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) ALTITUDE RANGE HEAT VALUE... -
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.) component damage: HOOK-AROUND... -
Page 12: Checklist
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB g. Reconnect inducer motor wires, replace door, and 4. Verify that the blower (lower door in upflow position) and turn on 115−v power. 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 Figure 6 Multipoise Orientations PROCEDURES WARNING FIRE, INJURY OR DEATH HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. The ability to properly perform maintenance on this equipment requires certain knowledge, mechanical skills, tools, and equipment. -
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 DISCONNECT THREE-WIRE HEATING-ONLY... -
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, FIRE OR EXPLOSION HAZARD have furnace and burner serviced by a qualified service agency. - 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. 4.
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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. furnace wiring diagram, and connect thermostat leads if 3. -
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 6. Connect condensate drain elbow or drain extension upper corner of the collector box. (See Figure 1) elbow to the condensate trap 7. -
Page 20: Winterization
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB 7. Clean heat exchanger openings with a vacuum and a the heat exchanger assembly. Detailed information on heat soft brush. (See Figure 12) exchanger removal can be obtained from your Distributor. Winterization Figure 12 Cleaning Heat Exchanger Cell CAUTION... -
Page 21: Service Label
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB Figure 14 Service Label 338310−2 Rev F 440 04 4411 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 4411 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 4411 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 4411 03 Specifications subject to change without notice.
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Page 25: Sequence Of Operation
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSB SEQUENCE OF OPERATION EAC will remain energized for 90, 120, 150, or 180 seconds (depending on the heat−OFF delay selection). NOTE: Furnace control must be grounded for proper operation The furnace control CPU is factory−set for a or control will lock out. -
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 Electrical Group Heat Exchanger Group Control box... -
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 International Comfort Products, LLC Consumer Relations Department P.O. Box 128 Lewisburg, TN 37091, USA 931−270−4100 440 04 4411 03...