Page 1: Table Of Contents
....... START−UP, ADJUSTMENT, AND SAFETY CHECK ... N9MSE0261408 PRIME CONDENSATE TRAP WITH WATER ....
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 or other conditions which may cause death, personal injury, or DAMAGE 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: Start−Up Check Sheet
SERVICE AND TECHNICAL MANUAL Gas Furnace: N9MSE START−UP CHECK SHEET For PSC Models N9MSE (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...
Page 4: Start−Up, Adjustment, And Safety Check
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 NOTICE should run through collector box, overfill condensate trap, and flow into open field drain.
Page 5 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE NOTICE CAUTION FURNACE DAMAGE HAZARD The NATURAL GAS manifold pressure adjustments in Table 3 and Table 4 compensate for BOTH altitude AND gas heating Failure to follow this caution may result in reduced furnace value.
Page 6: Check Inlet Gas Pressure
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 2. Obtain average yearly gas specific gravity from local gas 1. Make sure the gas supply is turned off to the furnace and supplier. at the electric switch on the gas valve. 2.
Page 7 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE NOTICE Gas Valve (Single Stage) with Tower Pressure Ports For 40,000 BTUH to 120,000 BTUH models. DO NOT set MANIFOLD PRESSURE TAP manifold pressure less than 2.8−in. w.c. (697 Pa) or more than SET SCREW: 3/32”...
Page 8 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE f. Multiply gas rate cu ft./hr by heating value (Btuh/cu c. Tighten set screw on manifold tower pressure tap ft.) to obtain input. If clocked rate does not match with 3/32−in. hex wrench, or if 1/8−in. NPT plug was required input from Step 1, increase manifold removed, apply pipe dope sparingly to end of plug pressure to increase input or decrease manifold...
Page 9: Gas Rate (Cu Ft./Hr)
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Table 2 Gas Rate (CU ft./hr) SECONDS SECONDS SIZE OF TEST DIAL SIZE OF TEST DIAL FOR 1 FOR 1 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft.
Page 10: Orifice Size And Manifold Pressure
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − 26,000 BTUH Single Table 3 Stage ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE (TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL ALTITUDE AVG.
Page 11 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Table 3 (CONT.) Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − 26,000 BTUH Single Stage ORIFICE SIZE* AND MANIFOLD PRESSURE (IN WC) FOR GAS INPUT RATE (TABULATED DATA BASED ON 13,000 BTUH PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL 7001 (2134) 8000...
Page 12 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − 40,000 − 140,000 BTUH Table 4 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 13: Adjust Temperature Rise
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − 40,000 − 140,000 BTUH Table 4 (CONT.) 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 14: Adjust Blower Off Delay
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Change the blower speed taps as required to maintain proper Figure 5 Amp. Draw Check with Ammeter temperature rise for Heating and Cooling as described above. To change blower motor speed selections for heating mode, THERMOSTAT SUBBASE remove blower motor lead from control HEAT terminal(s).
Page 15: Cooling Air Delivery
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 8. Check operation of accessories per manufacturer’s 9. Review Home Owner’s Information with owner. instructions. 10. Attach entire literature packet to furnace. Table 6 COOLING AIR DELIVERY - CFM (With Filter EXTERNAL STATIC PRESSURE (in. w.c.) SPEED UNIT RETURN-AIR...
Page 16: Service And Maintenance Procedures
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 17: Heating And Cooling Application Wiring Diagram
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Figure 7 Heating and Cooling Application Wiring Diagram − 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 18: Care And Maintenance
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 19 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 2. Remove blower door. Figure 8 Blower Assembly 3. All factory wires can be left connected, but field MOTOR SHAFT FLAT thermostat and accessory wiring may need to be disconnected depending on their length and routing. 4.
Page 20: Cleaning Burners And Flame Sensor
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 21: Servicing Hot Surface Igniter
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 22: Cleaning Condensate Drain And Trap
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 5. Attach a funnel with a flexible tube to port on the collector 9. Turn gas on at electric switch on gas valve and at box. external shut-off or meter 6. Flush inside of collector box with water until discharge 10.
Page 23: Winterization
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 24: Service Label
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Figure 14 Service Label 338310−2 Rev F 440 04 4402 07 Specifications subject to change without notice.
Page 25: Wiring Diagram
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Figure 15 Wiring Diagram 339241−2 Rev A 440 04 4402 07 Specifications subject to change without notice.
Page 26: Troubleshooting − Flow Chart
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Figure 16 Troubleshooting − Flow Chart 440 04 4402 07 Specifications subject to change without notice.
Page 27 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE Figure 16 (CONT.) Troubleshooting − Flow Chart L12F045 440 04 4402 07 Specifications subject to change without notice.
Page 28: Sequence Of Operation
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: N9MSE 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 29: Parts Replacement Information Guide
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or the classified section of your local telephone directory under the “Heating Equipment“ or “Air Conditioning Contractors and Systems” headings for dealer listing by brand name. International Comfort Products Consumer Relations Department P.O.
Page 30: Product Nomenclature
16 = 1600 CFM (max) 20 = 2000 CFM (max) 22 = 2200 CFM (max) COOLING AIRFLOW SALES (MAJOR) REVISION DIGIT ENGINEERING (MINOR) REVISION DIGIT Copyright 2018 International Comfort Products Lewisburg, TN 37091 USA 440 04 4402 07 Specifications subject to change without notice.

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International comfort products N9MSE0261408 Service And Technical Support Manual

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