Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2009©, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington,

DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety.

Printed in U.S.A.

C8MPL, H8MPL, T8MPL

Safety Labeling and Signal Words

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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.

PERSONAL INJURY, AND/OR PROPERTY

DAMAGE HAZARD

Failure to carefully read and follow this warning could

result in equipment malfunction, property damage,

personal injury and/or death.

Installation or repairs made by unqualified persons

could result in equipment malfunction, property

damage, personal injury and/or death.

The information contained in this manual is intended for

use by a qualified service technician familiar with safety

procedures and equipped with proper tools and test

instruments.

Installation must conform with local building codes and

with the Natural Fuel Gas Code (NFCG) NFPA 54/ANSI

Z223.1,

and

CAN/CSA−B149.1 and .2 Natural Gas and Propane

Installation Codes.

INSTALLER: Affix these instructions on or adjacent to the

furnace.

CONSUMER: Retain these instructions for future refer-

ence.

WARNING

National

standards

441 01 2613 06

Canada

July 2010

Table of Contents

Summary of Contents for ICP N8MPN

Page 1: Table Of Contents
INSTALLATION INSTRUCTIONS 80% Single Stage, Category I, Gas Furnace N8MPN, N8MPL, C8MPN, H8MPN, T8MPN, C8MPL, H8MPL, T8MPL (Upflow/Downflow/Horizontal) These instructions must be read and understood completely before attempting installation. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals...
Page 2: Safety Considerations
SAFETY CONSIDERATIONS WARNING Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical ELECTRICAL SHOCK HAZARD shock, or other conditions which may cause death, personal Failure to follow this warning could cause personal injury, or property damage. Consult a qualified installer, injury or death.
Page 3 START−UP CHECK SHEET For 80+ Furnace (This sheet is optional. Keep this page for future reference.) Date of Start−Up: Calculated Firing Rate:(See Checks and Adjustments Section). Dealer Name: Heating Check Address: Measured Line Pressure when Firing Unit: City, State(Province), Zip or Postal Code: Measured Manifold Gas Pressure: Phone: Temperature of Supply Air:...
Page 4: Safe Installation Requirements
1. Safe Installation Requirements WARNING • Unit MUST be installed so electrical components are protected from direct contact with water. Safety Rules FIRE, EXPLOSION, AND ASPHIXIATION HAZARD Your unit is built to provide many years of safe and dependable Improper adjustment, alteration, service,...
Page 5: Installation
Your furnace is designed solely to provide a safe and comfortable −or− living environment. The furnace is NOT designed to ensure that Have someone check the structure frequently during cold water pipes will not freeze. It is equipped with several safety weather to make sure it is warm enough to prevent pipes devices that are designed to turn the furnace off and prevent it from from freezing.
Page 6 Figure 1 Dimensions and Clearances N8MPN/L MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS FOR ALL UNITS REAR FRONT (combustion air openings 3″ (76 mm) in furnace and in structure) Required For Service ″ (762 mm) ALL SIDES Of SUPPLY PLENUM 1″ (25 mm)
Page 7 Figure 2 Dimensions and Clearances *8MPN/L Models MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS FOR ALL UNITS REAR FRONT (combustion air openings in 3″ (76 mm) (135) furnace and in structure) (127) 24″ (610) min. Required For Service 24″ (610 mm) (25) ALL SIDES Of SUPPLY PLENUM 1″...
Page 8 A concrete pad 1″ to 2″ (25.4 to 50.8mm) thick bottom. is recommended. N8MPN/L, C8MPN/L, H8MPN/L 24″ (609.6mm) is required between the front of the furnace and adjacent construction or other appliances. This should 1. Carefully remove logo from burner compartment door and maintained for service clearance.
Page 9: Side Venting
2. Turn the logo rightside−up, and install the logo retainer pins the switch and tubing far enough away from the burners or hot into holes in burner compartment door. surfaces as to not melt the hose, switch, or wires. To prevent possible kinking of the pressure switch hose, trim the hose to 3.
Page 10: Combustion & Ventilation Air
7. Tighten the three (3) or four (4) screws that secure the venter Venter Gasket assembly to the collector box. Do tighten screws enough to Figure 7 compress venter gasket. 8. Replace power leads to venter motor and reconnect hose to Main Line Entry pressure switch.
Page 11 2. Figure 8 illustrates how to provide combustion and ventilation communicating with the outdoors require 1 square inch air when two permanent openings, one inlet and one outlet, are of free area per 4,000 BTUH (5.5 cm /kW) for combined used.
Page 12 The Standard Method may be used, if the space has no less Indoor Combustion Air volume than 50 cubic feet per 1,000 BTUH (4.8 cubic meters per Standard and Known-Air-Infiltration Rate Methods kW) of the maximum input ratings for all gas appliances installed in the space.
Page 13: Gas Vent Installation
temperature across the heat exchanger MUST not fall below 60° Ventilation Air F(16° C) continuously, or 55° F(13° C) on an intermittent basis so Some provincial codes and local municipalities require ventilation that flue gases will not condense excessively in the heat or make−up air be brought into the conditioned space as exchanger.
Page 14: Venting (Horizontal)
WARNING Venting to Existing Masonry Chimney Dedicated venting of one fan assisted furnace into any CARBON MONOXIDE POISONING HAZARD masonry chimney is restricted. A chimney must first be lined with either Type vent sized accordance with Failure to follow the steps outlined below for each appliance connected to the venting system being placed ANSIZ223.1/NFPA−2009 tables 13.1a or 13.1b or a listed metal lining system.
Page 15 Figure 10 Other than Direct Vent Termination Clearance Item Clearance Descriptions Canadian Installation (1) U.S. Installation (2) Clearance above grade, veranda, porch, deck, balcony, or 12″ (30cm) # 12″ (30 cm) anticipated snow level 12″ (30 cm) for appliances u 10,000 Btuh (3 kW) and v Clearance to a window or door that may be opened 4′...
Page 16: Masonry Chimney Venting (Chimney Adapter)
7. Masonry Chimney Venting Chimneys shall conform to the Standard for Chimneys, Chimney Inspection Fireplaces, Vents, and Solid Fuel Burning Appliances ANSI/NFPA All masonry chimney construction must conform to Standard 211−2006 in the United States and to a Provincial or Territorial ANSI/NFPA 211−2006 and to any state or local codes applicable.
Page 17 Figure 11 CHIMNEY INSPECTION CHART For additional requirements refer to the National Fuel Gas Code ANSI Z223.1/NFPA 54-2009 and ANSI/NFPA 211-2006 Chimneys, Fireplaces, Vents, and Solid Fuel Burning Appliances in the U.S.A. or to the Canadian Installation Code CSA B149.1-05 in Canada. Crown condition: Rebuild...
Page 18 Shows signs of vent gas condensation, the chimney should Exterior Masonry Chimney, be relined in accordance with local codes and the authority FAN+NAT Installations with having jurisdiction. The chimney should be relined with a Type−B Double−Wall Vent Connectors listed metal liner, Type−B vent, or a listed chimney adapter kit to reduce condensation.
Page 19: Gas Supply And Piping
8. Gas Supply and Piping WARNING Gas Piping Requirements NOTE: The gas supply line must be installed by a qualified service CARBON MONOXIDE POISONING, FIRE AND technician in accordance with all building codes. EXPLOSION HAZARD NOTE: In the state of Massachusetts. Failure to follow this warning could result in personal injury, death, and/or property damage.
Page 20 Use black iron or steel pipe and fittings or other pipe approved by local code. Figure 14 Gas Valve with Elbows (N8MP) Use pipe thread compound which is resistant to natural and Propane gases. Use ground joint unions and install a drip leg no less than 3″ (76.2mm) long to trap dirt and moisture before it can enter gas valve inside furnace.
Page 21 WARNING Typical Gas Piping (*8MP) Figure 16 FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. A flexible corrugated metal gas connector must be properly installed, shall not extend through the side of the furnace, and shall not be used inside the furnace.
Page 22: Electrical Wiring
Junction Box (J-Box) Relocation The furnace is wired for 115 VAC humidifier and/or electronic air cleaner connection. N8MPN/L Models CAUTION The J−box is installed in blower compartment on left side of casing. An alternate J−Box location on right side can be used.
Page 23: Ductwork And Filter
Furnace Control Fuse Electrical Connections Figure 19 The 24V circuit contains a 5−amp, automotive−type fuse located on furnace control. (See Figure 20) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.).
Page 24 close to a living area. It is often advisable to route the return air High−Velocity Air Filter Sizes ducts under the floor or through the attic. Table 4 (max. 600 FPM/3.0 m/s) • Refer to furnace Technical Support Manual (Blower Data) Internal Cabinet for air flow information.
Page 25 Internal Filter in Bottom-Return Installation Optional Duct Standoff − Figure 22 NAHA001TK in(mm) When installing a bottom−mounted filter inside the furnace, install the filter clips on the edge of the bottom duct opening with the wider end of the clips toward the blower, as shown in Figure 25. Clips may be obtained from your distributor or fabricated from sheet metal (Figure 26).
Page 26 11. Ductwork and Filter (Downflow) WARNING The Subbase for Combustible Floors MUST be used when a downflow furnace is set on a combustible floor, even when the furnace is installed on a coil box. CARBON MONOXIDE POISONING HAZARD Cut the opening in the floor according to the dimensions in Failure to follow this warning could result in Table 5 because the base is equipped with locating tabs that personal injury or death.
Page 27 Table 5 Sub−bases for Combustible Floors Dimensions in(mm) Sub−base for Combustible Opening In Typical Plenum Sub−base for Opening In Floor Floor Dimensions Base For Plenum Dimensions Combustible Floors Part Number Subbase for Furnace Only NAHH001SB (730.3) (369.9) 16(406.4) 15 (381) 15 (381) (398.5) (412.8)
Page 28: Checks And Adjustments
NOTE: If filters are only suitable for heating application, Top Mounted Internal Filter Figure 31 advise homeowner that filter size may need to be increased if air conditioning is added. 9″ Addition Of Air Conditioning See Section 10. Center Clip side-to-side 12.
Page 29 Natural Gas Input Rating Check Operation Above 2000′ (610m)Altitude WARNING The gas meter can be used to measure input to furnace. Check with gas supplier for actual BTU content. FIRE, EXPLOSION, CARBON MONOXIDE POISONING HAZARD Turn OFF gas supply to all appliances other than furnace and start furnace.
Page 30 MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS Table 6 NATURAL GAS MANIFOLD PRESSURE (in wc) MEAN ELEVATION ABOVE SEA LEVEL − ft(m) HEATING 0 to 2000 2001 to 3000* 3001 to 4000 4001 to 5000 5001 to 6000 6001 to 7000 7001 to 8000 VALUE...
Page 31 FOR PROPANE CONVERSION REMOVE SCREWS THAT Figure 33 Manifold SECURE THE NOX INSERT AND DISCARD INSERT. Reinstall screws. See Figure 36 NOTE: It is very important to reinstall the NOx insert mounting screws. Removing NOx inserts Figure 35 Some Models may vary 25-25-00 After reassembling, turn gas on and check all joints for gas leaks using a soapy solution.
Page 32 Change the heat or cool blower motor speed by removing the Air Temperature Rise Check motor speed lead from the “Heat” or “Cool” terminal and CAUTION replace it with the desired motor speed lead from the “M1” or “M2” location. Connect the wire previously removed from the “Heat”...
Page 33: Furnace Maintenance
13. Furnace Maintenance WARNING WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD FIRE, EXPLOSION, OR CARBON MONOXIDE Failure to follow this warning could result in POISONING HAZARDS dangerous operation, personal injury, death, or Failure to follow this warning could result in property damage.
Page 34: Sequence Of Operation & Diagnostics
14. Sequence of Operation & Diagnostics The following is the normal operating sequence. Cooling (Y) Request: 24VAC signals applied to Y & G terminals of FCB (furnace control board) • Cool motor speed is energized after 5 second Cool Fan On Delay time. Y &...
Page 35 Heating Request with Gas Shut Off: 24 VAC signal applied to W terminal of FCB. The FCB will attempt 4 cycles for ignition then go to soft lockout for 3 hours then try for ignition again as long as the heat call remains. Power reset will clear lockout.
Page 36: Technical Support Manual
Save This Manual For Future Reference Models N8MPN050B12B2 N8MPL050B12B2 N8MPN075B12B2 N8MPL075B12B2 N8MPN075F16B2 N8MPL075F16B2 N8MPN100F14B2 N8MPL100F20B2 N8MPN100F20B2 N8MPL100J22B2 N8MPN100J22B2 N8MPL125J20B2 N8MPN125J20B2 N8MPL125J22B2 N8MPN125J22B2 *8MPN050B12B2 *8MPL050B12B2 *8MPN075B12B2 *8MPL075B12B2 *8MPN075F16B2 *8MPL075F16B2 *8MPN100F14B2 *8MPL100F20B2 *8MPN100F20B2 *8MPL100J20B2 *8MPN100J20B2 *8MPL125J20B2 *8MPN125J20B2 *8MPN150J20B2 * Denotes Brand International Comfort Products, LLC Lewisburg, TN 37091 U.S.A.
Page 37 Manufacturers Number (Mfr No -See Rating Plate) ALL Models (N8MPN) Specifications N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN N8MPN 050B12 075B12 075F16 100F14 100F20 100J22 125J20 125J22 General Input (Btuh) 50,000 75,000 75,000 100,000 100,000 100,000 125,000 125,000 Output (Btuh)
Page 38 Manufacturers Number (Mfr No -See Rating Plate) ALL Models (N8MPL) Specifications N8MPL N8MPL N8MPL N8MPL N8MPL N8MPL N8MPL 050B12 075B12 075F16 100F20 100J22 125J20 125J22 General Input (Btuh) 50,000 75,000 75,000 100,000 100,000 125,000 125,000 Output (Btuh) 40,000 60,000 60,000 80,000 80,000 100,000...
Page 39 Manufacturers Number (Mfr No -See Rating Plate) ALL Models (*8MPN) Specifications *8MPN *8MPN *8MPN *8MPN *8MPN *8MPN *8MPN *8MPN 050B12 075B12 075F16 100F14 100F20 100J20 125J20 150J20 General Input (Btuh) 50,000 75,000 75,000 100,000 100,000 100,000 125,000 150,000 Output (Btuh) 40,000 60,000 60,000...
Page 40 Manufacturers Number (Mfr No -See Rating Plate) ALL Models (*8MPL) Specifications *8MPL *8MPL *8MPL *8MPL *8MPL *8MPL 050B12 075B12 075F16 100F20 100J20 125J20 General Input (Btuh) 50,000 75,000 75,000 100,000 100,000 125,000 Output (Btuh) 40,000 60,000 60,000 81,000 81,000 101,000 Temp.
Page 41 15. Circulation Air Blower Data (CFM) * Denotes Brand * Denotes Brand N8MPN/L050B12 & *8MPN/L050B12 (1)(8) N8MPN100F14 & *8MPN100F14 (1)(8) Air Delivery in CFM (L/s) Air Delivery in CFM (L/s) Furnace Rated @0.5 in wc (125 Pa) ESP Furnace Rated @0.5 in wc (125 Pa) ESP...
Page 42 Circulation Air Blower Data Continued * Denotes Brand * Denotes Brand *8MPN/L100J20 (2)(8) N8MPN/L125J20 & *8MPN/L125J20 (2)(5)(8) Air Delivery in CFM (L/s) Air Delivery in CFM (L/s) Furnace Rated @0.5 in wc (125 Pa) ESP Furnace Rated @0.5 in wc (125 Pa) ESP...
Page 43: Wiring Diagram
Wiring Diagram N8MPN/L, *8MPN/L 441 01 2613 06 Specifications are subject to change without notice.
Page 44 INDUCED−COMBUSTION GAS FURNACE PARTS REPLACEMENT INFORMATION GUIDE CASING GROUP FILTER GROUP Flame sensor Hot surface ignitor Outer door Filter(s) − washable (1−in.) Gas valve Blower door Manual reset limit switch HEAT EXCHANGER GROUP Door bracket Burner support assembly Top filler plate Heat exchanger cell WARNING Bottom encloser...

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