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INSTALLATION INSTRUCTIONS
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80% Single Stage, ECM Motor
Category I, Gas Furnace
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NOTE: Read the entire instruction manual before starting the
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installation.
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Portions of the text and tables are reprinted from current edition
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of NFPA 54/ANSI Z223.1E, with permission of National Fire
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Protection Association, Quincy, MA 02269 and American Gas
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Association, Washington DC 20001. This reprinted material is
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not the complete and official position of the NFPA or ANSI on
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Use of the AHRI Certified
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manufacturer's participation in the program. For
verification of certification for individual products,
go to www.ahridirectory.org.
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Summary of Contents for Carrier N8MXL
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Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS 80% Single Stage, ECM Motor Category I, Gas Furnace N8MXL SAFETY CONSIDERATIONS ..... . . GENERAL ........ -
Page 2: Safety Considerations
SAFETY CONSIDERATIONS 1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate. WARNING 2. Install this furnace only in a location and position as spe- cified in the “Location” section of these instructions. 3. - Page 3 used with a night setback thermostat. Return−air temperature For accessory installation details, refer to the applicable must not exceed 80_F (27_C) db. Failure to follow these instruction literature. return−air temperature limits may affect reliability of heat NOTE: Remove all shipping brackets and materials before exchangers, motors, and controls.
- Page 4 A10269 Fig. 2 − Clearances to Combustibles 441 01 1422 00 Specifications are subject to change without notice.
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Page 5: Codes And Standards
Electrical Connections Current edition of National Electrical Code (NEC) NF- PA 70. Venting Current edition of NFGC NFPA 54 / ANSI Z223.1; Chapters 12 and 13. ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE CAUTION FURNACE RELIABILITY HAZARD Improper installation or service of furnace may cause premature furnace component failure. -
Page 6: 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 OF THE BURNER SECTION,... - Page 7 All fuel−burning equipment must be supplied with air for fuel CAUTION combustion. Sufficient air must be provided to avoid negative pressure in the equipment room or space. A positive seal must be made between the furnace cabinet and the return−air duct to PERSONAL INJURY AND/OR PROPERTY prevent pulling air from the burner area and from draft safeguard DAMAGE HAZARD...
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Page 8: Location Relative To Cooling Equipment
Table 3 – Minimum Space volumes for 100% combustion, Ventilation, and Dilution from Indoors OTHER THAN FAN-ASSISTED TOTAL FAN-ASSISTED TOTAL (1,000'S BTUH GAS INPUT RATE (1,000'S BTUH GAS INPUT RATE) ACH* Space Volume (ft. 0.60 1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300... - Page 9 1 SQ IN. CIRCULATING AIR PER 4000 VENT THROUGH ROOF DUCTS DUCTS BTUH* O UTDOORS 12" MAX (305mm) 12 ″ MAX 12 ″ (305mm) (305mm) 1 SQ IN. VENT 1 SQ IN. PER 2000 THR OUGH PER 1000 BTUH* R OOF BTUH* IN DOOR 1 SQ IN .
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Page 10: Combination Of Indoor And Outdoor Air
INSTALLATION Ifan = combined input of all fan−assisted appliances in Btuh/hr ACH = air changes per hour (ACH shall not exceed 0.60.) UPFLOW INSTALLATION The following requirements apply to the Standard Method and to Bottom Return Air Inlet the Known Air Infiltration Rate Method. These furnaces are shipped with bottom closure panel installed in 1. -
Page 11: Downflow Installation
5/ 16 (8mm) (8mm) 5/ 16 (44mm) PLENUM OPENING (44mm) FLOOR (8mm) OPENING (8mm) 5/ 16 (44mm) 3/ 4 3/ 4 (44mm) A89014 A96283 Fig. 10 − Leveling Legs Fig. 11 − Floor and Plenum Opening Dimensions 4. -
Page 12: Opening Dimensions − In. (Mm)
FURNACE APPROVED COIL ASSEMBLY COIL BOX COMBUSTIBLE FLOORING SHEET METAL PLENUM FLOOR OPENING A08556 Fig. 13 − Furnace, Plenum, and Coil Assembly or Coil Box Installed on a Combustible Floor Table 4 – Opening Dimensions − In. (mm) FURNACE PLENUM OPENING FLOOR OPENING CASING APPLICATION... -
Page 13: Horizontal Installation
HORIZONTAL INSTALLATION Not all horizontal furnaces are approved for side return air connections. (See Fig. 21.) WARNING FILTER ARRANGEMENT WARNING FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING HAZARD CARBON MONOXIDE AND POISONING Failure to follow this warning could result in personal HAZARD injury, death, and/or property damage. - Page 14 Upflow and Horizontal Furnaces Downflow Furnaces Connect supply−air duct to flanges on furnace supply−air outlet. Connect supply−air duct to supply−air outlet on furnace. Bend Bend flange upward to 90_ with wide duct pliers. (See Fig. 14.) flange inward past 90_ with wide duct pliers. (See Fig. 14.) The The supply−air duct must be connected to ONLY the furnace supply−air duct must be connected to ONLY the furnace supply supply−outlet−air duct flanges or air conditioning coil casing...
- Page 15 METHOD 2 USE (4) #8 x 3/4 (19 mm) SHEET METAL SCREWS FOR EACH STRAP. THE STRAPS SHOULD BE VERTICAL AGAINST THE FURNACE SIDES AND NOT PULL AWAY FROM THE FURNACE SIDES. METHOD 1 FOLD ALL STRAPS UNDER FURNACE AND SECURE WTH (4) #8 x 3/4 (19 mm) SHEET METAL SCREWS (2 SCREWS IN SIDE AND 2 SCREWS IN BOTTOM).
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Page 16: Return Air Connections
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. If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. - Page 17 Table 5 – Air Delivery − CFM (With Filter)* WIRE− Test Airflow Delivery @ Various External Static Pressures (in. w.c.) UNIT SIZE LEAD- SPEED COLOR Gray 1230 1190 1155 1120 1080 1045 1010 Yellow 0451412 Orange Blue −− Gray 1370 1335 1295 1255...
- Page 18 Gray 2065 2005 1940 1875 1810 1740 1670 1600 1530 1470 Blue 1825 1760 1695 1630 1560 1490 1420 1350 1275 1205 Yellow 1760 1690 1625 1555 1485 1415 1345 1275 1200 1130 1352420 Orange 1620 1550 1480 1405 1335 1260 1195 1130...
- Page 19 A02163 Fig. 20 − Downflow Return Air Configurations and Restrictions A02162 Fig. 21 − Horizontal Return Air Configurations and Restrictions 2” (51mm) Street Elbow A08551 Fig. 22 − Burner and Manifold 441 01 1422 00 Specifications are subject to change without notice.
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Page 20: Electrical Connections
Table 7 – Electrical Data Operating Maximum Voltage* Range Volts− Minimum Maximum Fuse or FURNACE Maxi- Mini- Hertz− Maximum Unit Wire Size Wire Length‡ CKT BKR† MODEL Amps Phase Unit Amps Ampacity# ft (m) 0451412 115−60−1 14.0 47.0 (14.3) 15.0 0451714 115−60−1 10.3... -
Page 21: J−Box Relocation
or ordinances that might apply. 10. Reattach furnace J−Box to furnace casing with screws re- moved in Step 4. WARNING 11. Secure field ground wire to J−Box green ground screw. 12. Complete electrical box wiring and installation. Connect line voltage leads as shown in Fig. 25. Use best practices FIRE HAZARD (NEC in U.S. -
Page 22: Accessories
maintenance could cause this fuse to blow. If fuse replacement is for heat (W) and the pressure switch (PRS) closes. (See Fig. 24 and 47). required, use ONLY a 3−amp. fuse of identical size. b. HUM: Connect an accessory 115VAC (EAC and ACCESSORIES HUM are 1 amp maximum combined) humidifier (if 1. - Page 23 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 208/230- OR BLOWER DOOR SWITCH 460-V THREE PHASE 208/230-V SINGLE PHASE AUXILIARY 115-V FIELD- J-BOX SUPPLIED NOTE 1 DISCONNECT CONDENSING...
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Page 24: Venting
VENTING GENERAL VENTING REQUIREMENTS The furnace shall be connected to a listed factory built chimney Follow all safety codes for proper vent sizing and installation or vent, or a clay−tile lined masonry or concrete chimney. Venting requirements, including local building codes, the current edition into an unlined masonry chimney or concrete chimney is of National Fuel Gas Code ANSI Z223.1/NFPA 54 (NFGC), prohibited. -
Page 25: Appliance Application Requirements
This furnace is permitted to be vented into a clay tile−lined Table 9 – Minimum Allowable Input Rating of Space−Heat- masonry chimney that is exposed to the outdoors below the roof ing Appliance in Thousands of BTUH per Hour line, provided: INTERNAL AREA OF CHIMNEY 1. - Page 26 CHIMNEY INSPECTION CHART For additional requirements refer to the National Fuel Gas Code NFPA 54/ANSI Z223.1 and ANSI/NFPA 211 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances Crown Rebuild condition: crown. Missing mortar or brick? Is chimney property lined with clay tile liner? Repair Reline...
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Page 27: Additional Venting Requirements
To prevent condensation in the furnace and vent system, the NOTE: An accessory flue extension is available to extend from following precautions must be observed: the furnace elbow to outside the furnace casing. See Specification Sheet for accessory listing. If flue extension is used, fasten the 1. - Page 28 Caution!! For the following applications, use the minimum vertical vent heights as specified below. For all other applications, follow exclusively the National Fuel Gas Code. MIN. VENT MIN. VERTICAL VENT FURNACE FURNACE INPUT DIAMETER HEIGHT VENT ORIENTATION ORIENTATION (BTUH/HR) IN (MM)* FT.
- Page 29 SEE NOTES: 1,2,4,7,8,9 on the page following these figures SEE NOTES: 1,2,4,5,6,7,8,9 on the page following these figures A03207 A03213 Fig. 31 − Downflow Application−Vent Elbow Left then Up Fig. 33 − Horizontal Left Application−Vent Elbow Left SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures SEE NOTES:1,2,3,4,5,7,8,9 on the page following...
- Page 30 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 following these figures A03214 A03219 Fig. 35 − Horizontal Right Application−Vent Elbow Right Fig. 37 − Horizontal Right Application−Vent Elbow Left then Up SEE NOTES: 1,2,4,5,7,8,9 on the page SEE NOTES: 1,2,4,5,7,8,9 on the page following these figures following these figures...
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Page 31: Start−Up, Adjustment, And Safety Check
START−UP, ADJUSTMENT, AND SAFETY WARNING CHECK General ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal WARNING injury, or death. Blower access door switch opens 115−v power to control. FIRE HAZARD No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch Failure to follow this warning could result in personal injury, death and/or property damage. - Page 32 sea level. For installations below 2000 ft. (610 M), refer to g. Remove regulator seal cap and turn regulator adjusting the unit rating plate. For installations above 2000 ft. (610 screw counterclockwise (out) to decrease input rate of M), multiply the input on the rating plate by the de−rate clockwise (in) to increase input rate.
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Page 33: Check Safety Controls
d. Turn thermostat down below room temperature and re- WARNING move blower access door. e. To change motor speed selection for heating, remove blower motor lead from control HEAT terminal (See Fig. FIRE HAZARD 24.) Select desired blower motor speed lead from one of Failure to follow this warning could result in personal the other terminals and relocate it to the HEAT terminal injury, death, and/or property damage. -
Page 34: Checklist
2. Check draft safeguard switch. THERMOSTAT SUBBASE TERMINALS WITH The purpose of this control is to cause the safe shutdown THERMOSTAT REMOVED of the furnace during certain blocked vent conditions. (ANITICIPATOR, CLOCK, ETC., MUST BE OUT OF CIRCUIT.) a. Verify vent pipe is cool to the touch. HOOK-AROUND b. - Page 35 Table 11 – Gas Rate (Cu Ft./Hr.) SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 REVOLUTION FOR 1 REVOLUTION 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. Cu Ft. 1800 1636 1500...
- Page 36 Table 12 – Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate A10180 441 01 1422 00 Specifications are subject to change without notice.
- Page 37 Table 12 − Orifice Size* and Manifold Pressure (In. W.C.) for Gas Input Rate (CONT) A10180A 441 01 1422 00 Specifications are subject to change without notice.
- Page 38 Table 13 – Orifice Size* And Manifold Pressure (In. W.C.) For Gas Input Rate A10181 441 01 1422 00 Specifications are subject to change without notice.
- Page 39 Table 13− Orifice Size* And Manifold Pressure (In. W.C.) For Gas Input Rate (CONT) A10181A 441 01 1422 00 Specifications are subject to change without notice.
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Page 40: Service And Maintenance Procedures
SERVICE AND MAINTENANCE INTRODUCTION PROCEDURES GENERAL These instructions are written as if the furnace is installed in an Untrained personnel can perform basic maintenance functions upflow application. An upflow furnace application is where the such as cleaning and replacing air filters. All other operations blower is located below the combustion and controls section of must be performed by trained service personnel. -
Page 41: Care And Maintenance
Fig. 43 − Service Label CARE AND MAINTENANCE WARNING WARNING CARBON MONOXIDE POISONING AND FIRE HAZARD FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in personal injury, death and/or property damage. injury, death and/or property damage. -
Page 42: Cleaning And/Or Replacing Air Filter
CLEANING AND/OR REPLACING AIR FILTER 9. If a greasy residue is present on blower wheel, remove wheel from the blower housing and wash it with an appro- The air filter arrangement will vary depending on the application. priate degreaser. To remove wheel: The filter is exterior to the furnace casing. -
Page 43: Cleaning Heat Exchanger
NOTE: If thermostat terminals are jumpered at the time blower NOTE: Be very careful when removing burner assembly to access door switch is closed, blower will run for 90 sec before avoid breaking igniter. See Fig. 44 and 45 for correct igniter beginning a heating or cooling cycle. -
Page 44: Sequence Of Operation
(6.) Using vacuum cleaner, remove residue from each WARNING cell. (7.) Using vacuum cleaner with soft brush attachment, clean burner assembly. FIRE OR EXPLOSION HAZARD (8.) Clean flame sensor with fine steel wool. Failure to follow this warning could result in personal injury, death and/or property damage. -
Page 45: Wiring Diagrams
nace, or by interrupting 24 vac power at 24VAC or (25 sec), allowing the furnace heat exchangers to heat up COM to the furnace control CPU (not at W, G, R, etc.) more quickly, then restarts at the end of the blower−ON If flame is proved when flame should not be present, delay period at HEAT speed. - Page 46 Fig. 47 − Wiring Diagram 441 01 1422 00 Specifications are subject to change without notice.
- Page 47 441 01 1422 00 Specifications are subject to change without notice.
- Page 48 Fig. 48 − Troubleshooting Guide 441 01 1422 00 Specifications are subject to change without notice.
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Page 49: Parts Replacement Information Guide
PARTS REPLACEMENT INFORMATION GUIDE CASING GROUP GAS CONTROL GROUP Outer door Manifold Blower door Burner assembly Top filler plate Orifice Bottom filler plate Flame sensor Bottom enclosure Hot surface igniter ELECTRICAL GROUP Gas valve Manual reset limit switches Control bracket Burner support assembly Junction box HEAT EXCHANGER GROUP... - Page 50 Copyright 2018 International Comfort Products Lewisburg, TN 37091 USA 441 01 1422 00 Specifications are subject to change without notice.
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