Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS Single Stage, ECM Motor, Ultra Low NOx, 80% AFUE Gas Furnace N80ESU (Minor Series 2) SAFETY CONSIDERATIONS ......
Page 2: Safety Considerations
SAFETY CONSIDERATIONS 2. Install this furnace only in a location and position as specified in the “Location” section of these instructions. WARNING 3. Provide adequate combustion and ventilation air to the furnace space as specified in “Air for Combustion and Ventilation”...
Page 3 A190257 Fig. 1 - - Dimensional Drawing Table 1 – Dimensions VENT VENT CABINET TOP FLUE CONNECTION WIDTH OUTLET WIDTH COLLAR ONLY BOTTOM WIDTH SIZE* SHIP WT FURNACE SIZE IN. (MM) IN. (MM) IN. (MM) IN. (MM) IN. (MM) (LB / KG) 17- -1/2 (445) 15- -7/8 (403) 11- -9/16 (294)
Page 4: Codes And Standards
Duct Systems Air Conditioning Contractors Association (ACCA) Manual D, Sheet Metal and Air Conditioning Contract- ors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Condition- ing Engineers (ASHRAE) 2005 Fundamentals Hand- book Chapter 35 or 2004 HVAC Systems and Equip- ment Handbook Chapters 9 and 16.
Page 5: Location
THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND AIR CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED TO THE LEFT LOCATED ABOVE THE BURNER SECTION, AND...
Page 6 WARNING FIRE HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. When the furnace is installed in a residential garage, the burners and ignition sources must be located at least 18 inches above the floor. (See Fig. 5) The furnace must be located or protected to avoid damage by vehicles.
Page 7: Air For Combustion And Ventilation
b. Size openings and ducts per Fig. 7 and Table 2. CAUTION 1 SQ IN. PER 4000 DUCTS BTUH* FURNACE CORROSION HAZARD O UTDOORS Failure to follow this caution may result in furnace damage. Air for combustion must not be contaminated by halogen 12 ″...
Page 8: Installation
= combined input of all fan- -assisted appliances in Btuh/hr CIRCULATING AIR ACH = air changes per hour (ACH shall not exceed 0.60.) VENT THROUGH ROOF DUCTS The following requirements apply to the Standard Method and to the Known Air Infiltration Rate Method. 1.
Page 9: Downflow Installation
1. Tilt or raise furnace and remove two screws holding bot- 2. For each leg, install nut on bolt and then install bolt and tom filler panel. (See Fig. 9) nut in hole. (Install flat washer if desired.) 3. Install another nut on other side of furnace base. (Install flat washer if desired.) 4.
Page 10: Horizontal Installation
FURNACE FURNACE (OR COIL CASING APPROVED COIL ASSEMBLY WHEN USED) COIL BOX COMBUSTIBLE FLOORING COMBUSTIBLE FLOORING SHEET METAL PLENUM DOWNFLOW FLOOR SUBBASE OPENING SHEET METAL PLENUM FLOOR OPENING A08556 Fig. 13 - - Furnace, Plenum, and Coil Assembly or Coil Box Installed on a Combustible Floor A96285 Fig.
Page 11: Air Ducts
The bottom closure panel on furnaces of widths 17- -1/2 in. (445 Maintain a 1- -in. (25 mm) clearance from combustible materials mm) and larger may be used for flame roll- -out protection when to supply air ductwork for a distance of 36 in. (914 mm) bottom of furnace is used for return air connection.
Page 12 " (6mm) THREADED ROD 4 REQ. OUTER DOOR A S SEMBLY SECURE ANGLE IRON TO BOTTOM OF FURNACE WITH 3 #8 x " (19mm) SCREWS TYPICAL FOR 2 SUPPORTS 8" (203mm) MIN FOR DOOR REMOVAL 1” (25mm) SQUARE, 1-1/4”x1-1/4”x1/8” (32x32x3mm) ANGLE IRON OR UNI-STRUT MAY BE USED (2) HEX NUTS, (2) WASHERS &...
Page 13: Gas Piping
A180240 Fig. 17 - - Typical Attic Installation Return Air Connections WARNING WARNING FIRE OR EXPLOSION HAZARD FIRE HAZARD Failure to follow this warning could result in personal injury,death, and/or property damage. Failure to follow this warning could cause personal injury, death and/or property damage.
Page 14: Air Delivery - - Cfm
3. When lever handle type manual equipment shutoff valves of gas supply connection to furnace and downstream of manual are used, they shall be T- -handle valves. equipment shutoff valve. NOTE: 4. The use of copper tubing for gas piping is NOT approved The furnace gas control valve inlet pressure tap by the state of Massachusetts.
Page 15 shutoff valve before and during supply pipe pressure test. After all connections have been made, purge lines and check for leakage at furnace prior to operating furnace. The gas supply pressure shall be within the maximum and minimum inlet supply pressures marked on the rating plate with the furnace burners ON and OFF.
Page 16: Electrical Connections
ELECTRICAL CONNECTIONS Make all electrical connections in accordance with current edition of National Electrical Code (NEC) NFPA 70 and any local codes WARNING or ordinances that might apply. WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings could result in dangerous FIRE HAZARD operation, serious injury, death or property damage.
Page 17: 24- -V Wiring
24- -V WIRING 12. Complete electrical box wiring and installation. Connect line voltage leads as shown in Fig. 24. Use best practices Make field 24- -v connections at the 24- -v terminal strip. (See Fig. 24) (NEC in U.S. for wire bushings, strain relief, etc.) Connect terminal Y as shown in Fig.
Page 18 A190409 Fig. 23 - - Furnace Control Representative drawing only, some models may vary. A180241 Fig. 24 - - Heating and Cooling Application Wiring Diagram with 1- -Stage Thermostat Specifications are subject to change without notice. 441 01 1501 04...
Page 19: Venting
VENTING operate with a non- -positive vent static pressure to minimize the potential for vent gas leakage. Category I furnaces operate with a The furnace shall be connected to a listed factory built chimney flue loss not less than 17 percent to minimize the potential for or vent, or a clay- -tile lined masonry or concrete chimney.
Page 20: Appliance Application Requirements
used to reduce condensation. If a condensate drain is re- APPLIANCE APPLICATION REQUIREMENTS quired by local code, refer to the current edition of NFGC Appliance operation has a significant impact on the performance NFPA54/ANSI Z223.1, Section 12.10 for additional in- of the venting system.
Page 21 A180242 Fig. 25 - - Chimney Inspection Chart 441 01 1501 04 Specifications are subject to change without notice.
Page 22: Additional Venting Requirements
ADDITIONAL VENTING REQUIREMENTS SIDEWALL VENTING A 4” (101 mm) round vent elbow is supplied with the furnace. A This furnace is not approved for direct sidewall horizontal 5- -inch (127 mm) or 6- - inch (152 mm) vent connector may be venting.
Page 23: Start- -Up, Adjustment, And Safety Check
SEE NOTES: 1,2,4,7,8,9 on the page following these figures SEE NOTES: 1,2,4,5,7,8,9 on the page A03214 following these figures Fig. 29 - - Horizontal Right Application- -Vent Elbow Right A03215 Fig. 31 - - Horizontal Left Application- -Vent Elbow Up See NOTES following images.
Page 24: Start- -Up Procedures
3. Gas supply pressure to the furnace must be greater than Table 10 – Altitude Derate Multiplier for U.S.A. 4.5- -In. W.C. (0.16 psig ) but not exceed 14- -In. W.C. (0.5 PERCENT DERATE psig). MULTIPLIER ALTITUDE (FT. / M) DERATE FACTOR* 4.
Page 25 b. Loosen set screw on outlet tower pressure tap no more (2.) Return and supply ducts for excessive restrictions than one full turn with a 3/32 in. hex wrench. (See Fig. causing static pressures greater than the maximum heating static listed on the rating plate. c.
Page 26: Check Safety Controls
THERMOSTAT SUBBASE WARNING TERMINALS WITH THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC., MUST BE OUT OF CIRCUIT.) FIRE HAZARD HOOK-AROUND Failure to follow this warning could result in personal AMMETER injury, death, and/or property damage. Gas valve outlet pressure tap must be tightened to prevent gas leak.
Page 27 Table 11 – Gas Rate (Cu Ft./Hr.) Table 12 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - - 40,000 SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 FOR 1 Tabulated Data Based on 40,000 BTUH Input for 0---ft (0 M) 5 Cu REVOLU- REVOLU-...
Page 28 Table 13 – Gas Valve Outlet Pressure for Gas Heat Values at Table 14 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - - 60,000 Altitude - - 80,000 Tabulated Data Based on 80,000 BTUH Input, for 0---ft (0 M) Tabulated Data Based on 60,000 BTUH Input for 0---ft (0 M) to 5400---ft (1646 M) above sea level to 5400---ft (1646 M) above sea level...
Page 29: Service And Maintenance Procedures
SERVICE AND MAINTENANCE Table 15 – Gas Valve Outlet Pressure for Gas Heat Values at Altitude - - 100,000 PROCEDURES Tabulated Data Based on 100,000 BTUH Input for 0---ft (0 M) Untrained personnel can perform basic maintenance functions to 5400---ft (1646 M) above sea level such as cleaning and replacing air filters.
Page 30: Care And Maintenance
The electrical ground and polarity for 115- -v wiring must be See Fig. 35 for a summary of fault codes and a brief explanation properly maintained. Refer to Fig. 24 for field wiring information of fault codes. and to Fig. 38 for furnace wiring information. The stored status code will not be erased from the control NOTE: If the polarity is not correct, the STATUS LED on the memory, if 115- - or 24- -v power is interrupted.
Page 31: Cleaning And/Or Replacing Air Filter
BLOWER MOTOR AND WHEEL WARNING WARNING CARBON MONOXIDE POISONING AND FIRE HAZARD ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in personal injury injury, death and/or property damage. or death. Never operate unit without a filter or with filter access door Blower access door switch opens 115- -v power to control.
Page 32: Flame Sensor Cleaning And Servicing
11. Spin the blower wheel by hand to verify that the wheel WARNING does not rub on the housing. 12. Reinstall blower assembly in furnace. 13. Reinstall two screws securing blower assembly to blower ELECTRICAL SHOCK AND FIRE HAZARD deck. Failure to follow this warning could result in personal injury, death, and/or property damage.
Page 33: Cleaning Heat Exchanger
CLEANING HEAT EXCHANGER The following steps should be performed by a qualified service agency: NOTE: If the heat exchangers get a heavy accumulation of soot and carbon, they should be replaced rather than trying to clean them thoroughly. A heavy build- -up of soot and carbon indicates that a problem exists which needs to be corrected, such as improper adjustment of gas valve outlet pressure, insufficient or poor quality combustion air, incorrect size or damaged orifice(s),...
Page 34: Sequence Of Operation
d. Limit over- -temperature switch Sequence of Operation - - Heating e. Gas valve 1. Call for Heat: f. Hot surface ignitor The wall thermostat “calls for heat”, closing the R circuit. The furnace control performs a self- -check, verifies g.
Page 35: Wiring Diagrams
BLWM is operating. When the thermostat is satisfied, the delay, the blower motor BLWM will shut OFF unless R G and Y circuit is opened. The outdoor unit stops, and is circuit is closed, in which case the blower motor BLWM the furnace blower BLWM and electronic air cleaner will operate at FAN tap.
Page 36 A190414 Fig. 38 - - Wiring Diagram Specifications are subject to change without notice. 441 01 1501 04...
Page 37: Component Test
SERVICE GUIDE LED CODES STATUS CONTINUOUS OFF Check for 115VAC at L1 and L2, and 24VAC at SEC- -1 and SEC- -2. HEARTBEAT Control has 24VAC power. Line voltage (115VAC) polarity reversed. If status code recall is needed, briefly (2- -3 seconds) remove then reconnect one main limit wire to display stored status code. After status code recall is completed test will occur.
Page 38: Parts Replacement Information Guide
The qualified installer or service agency must use only factory- -authorized replacement parts, kits, or accessories when modifying this product. Copyright 2019 International Comfort Products Lewisburg, TN 37091 USA Specifications are subject to change without notice.

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