International comfort products N9MP1 Service Manual
Multi position
90% single stage
gas furnaces
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Also See for N9MP1:
- Installation instructions manual (61 pages) ,
- User's information manual (12 pages) ,
- User manual (12 pages)
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This manual supports single stage "C" series and later condensing gas furnaces
Manufactured by:
MULTI POSITION
90% SINGLE STAGE
GAS FURNACES
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N9MP1, N9MP2 & *9MPD
* Denotes brand H, C, T
© 2006 International Comfort Products LLC
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Part Number
440 08 2011 00
2/2006
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Table of Contents
Troubleshooting
Related Manuals for International comfort products N9MP1
Summary of Contents for International comfort products N9MP1
- Page 1 É É É É É N9MP1, N9MP2 & *9MPD * Denotes brand H, C, T This manual supports single stage “C” series and later condensing gas furnaces Manufactured by: Part Number 440 08 2011 00 2/2006 © 2006 International Comfort Products LLC...
- Page 2 N9MP1 − Indoor combustion air (1 pipe only) N9MP2 − Direct Vent ONLY (2 pipe only) *9MPD − Dual Certified Venting (1 or 2 pipes) * Denotes Brand (T, C or H)
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Page 3: Table Of Contents
............TECHNICAL SERVICE DATA (N9MP1 C1) . -
Page 4: Introduction
We require these instructions as a minimum for a safe installation. International Comfort Products LLC Lewisburg, TN 37091 440 08 2011 00... -
Page 5: Unit Identification
Service Manual Single Stage Multi Position Furnace UNIT IDENTIFICATION The unit’s rating plate contains important information for the placement parts (example, in certain model families a unit service technician. It also lists the complete Model having a MARKETING REVISION of “C” is likely to be Manufacturing and Serial Numbers. -
Page 6: Electrical Supply
Service Manual Single Stage Multi Position Furnace 6. The Combustion Blower Assembly is mounted on the firing the furnace until it senses that a proper draft has outlet side of the Secondary heat exchanger, This been established through the furnace. blower creates a partial vacuum (negative pressure) within the heat exchangers drawing the flue products SEQUENCE OF OPERATION −... -
Page 7: Interlock Switch
Service Manual Single Stage Multi Position Furnace 5. An alternate check would be to check for continuity 4. Check for Voltage between the Neutral (White) wire from the Neutral to a cold water pipe, (Pipe must be and Ground wire of the supply circuit. metal, and must have a continuous, uninterrupted connection to ground) or to a continuous, uninter- 5. - Page 8 Service Manual Single Stage Multi Position Furnace NOTE: Adjustment screw cover MUST be replaced on gas Gas Pressure Testing Devices Figure 3 control valve before reading manifold pressure and operat- ing furnace. Pressure Connections 5. Obtain gas heating value and installation site altitude. 6.
- Page 9 Service Manual Single Stage Multi Position Furnace MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS NATURAL GAS MANIFOLD PRESSURE (, w.c.) Table 2 MEAN ELEVATION FEET ABOVE SEA LEVEL HEATING 0 to 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to VALUE...
- Page 10 Service Manual Single Stage Multi Position Furnace NATURAL GAS MANIFOLD PRESSURE (, w.c.) FOR THE90% 80,000 BTUH MODEL AND Table 4 ALTERNATE INPUT MODELS MEAN ELEVATION FEET ABOVE SEA LEVEL HEATING 0 to 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to VALUE...
- Page 11 Service Manual Single Stage Multi Position Furnace High Altitude Input Rate = NOTE: Main burner orifices can be changed for high alti- Nameplate Sea Level Input Rate x (Multiplier) tudes. 1. Disconnect gas line from gas valve. High Altitude High Altitude High Altitude Multiplier 2.
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Page 12: Pressure Switch
Service Manual Single Stage Multi Position Furnace In the USA, for furnaces fired on standard rate, the input rating for Table 6 Alternate Input Ratings, USA ONLY. altitudes above 2000′ (5,0004 for 80,000 BTUH and alternate in- put) must be derated by 4% for each 1000′ above sea level (see BTUH BTUH Table 3 and Table 5) -
Page 13: Honeywell Vr8205S Gas Valve
Service Manual Single Stage Multi Position Furnace HONEYWELL VR8205S Gas Valve The VR8205S Gas Valve is a REDUNDANT type valve. wires to the valve during a call for heat. This check MUST This means that it consists of two (2) valves (internally) with be made IMMEDIATELY following the igniter warm−up peri- independent operators (solenoids) that both must be ener- od (17 seconds). -
Page 14: Room Thermostats
Service Manual Single Stage Multi Position Furnace ROOM THERMOSTATS Room thermostats are available from several different ment to compensate for varying current draw in the thermo- manufactures in a wide variety of styles. They range from stat circuit. the very simple and inexpensive Bi−metallic type to the The proper setting of heat anticipators then is important to complex and costly electronic set−back type. -
Page 15: Twinning Kits
Service Manual Single Stage Multi Position Furnace ALWAYS check to make sure that the control wiring is con- any connection to the furnace with this wiring. Then, run the nected to the proper terminal(s) of the equipment and ther- low voltage “Common” wire from the condensing unit back mostat you are using. -
Page 16: Pressure Switches
Service Manual Single Stage Multi Position Furnace switch, use ONLY a switch of EXACTLY the same tempera- N9MP1 & N9MP2 MAIN LIMIT SWITCH ture setting. Use of a different temperature limit switch can MODEL PART # OPEN CLOSE create a dangerous situation. Some of the main limit... - Page 17 OPEN ″ W.C. CLOSE ″ W.C. 075F12C 1013803 −1.8 −2 125J20C 1013166 −1.1 −1.3 080F16C 1013812 −1.3 −1.5 N9MP1 HIGH ALTITUDE TRANSITION SWITCH 100F14C 1013803 −1.8 −2 MODEL PART # OPEN ″ W.C. CLOSE ″ W.C. 100J20C 1013803 −1.8 −2 050B12C 1013803 −1.8...
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Page 18: Higher/Lower Negative Pressures
Service Manual Single Stage Multi Position Furnace appearance. ONLY FACTORY PROVIDED or AU- approximate operating pressures listed in this manual and THORIZED SUBSTITUTES ARE ACCEPTABLE. the switch setting(s) listed above for the model family you are servicing. Furnaces installed at altitudes of 4,000′ above sea level or higher may require replacing the standard pressure switch It is important to remember, that greater negative pressures with a high altitude pressure switch. -
Page 19: Vent/Combustion Air Piping
40′ & (5) 90° elbows with 3″ PVC pipe or Pipe Diameter Table Table 9 70′ & (5) 90° elbows with 3″ PVC pipe & N9MP1 & *9MPD Models Long Vent Kit (See Tech. Manual) 50,000, 75,000 & 80,000 Btuh Furnaces 125,000 Btuh Furnace 40′... - Page 20 Service Manual Single Stage Multi Position Furnace Direct Vent Termination Clearance Figure 16 25−24−65−2 AREA WHERE TERMINAL IS NOT PERMITED VENT TERMINAL AIR SUPPLY INLET U.S. Installation (2) Item Clearance Description Canadian Installation (1) Clearance above grade, veranda, porch, deck, balcony, or 12″...
- Page 21 Service Manual Single Stage Multi Position Furnace Other than Direct Vent Termination Clearance Figure 17 25−24−65−2 AIR SUPPLY INLET VENT TERMINAL AREA WHERE TERMINAL IS NOT PERMITED Item Clearance Descriptions Canadian Installation (1) U.S. Installation (2) Clearance above grade, veranda, porch, deck, balcony, or 12″...
- Page 22 Service Manual Single Stage Multi Position Furnace Standard Termination Concentric Vent and Combustion− Figure 18 Figure 21 Rooftop Termination Air Sidewall Termination Inlet is optional on 1, Maximum Dual Certified models Combustion (TYP.) Vent A" Exhaust Vent 25−22−02d A = 12″ Above roof or snow accumulation level 25−00−06 Dimension “A”...
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Page 23: Concentric Vent Termination
Service Manual Single Stage Multi Position Furnace Recommended Alternate Installa- Rooftop Inlet Vent and Exhaust−Air Figure 24 Figure 25 tion for Sustained Cold Weather Termination (−05 F & below) 18, Min. for Cold Climates (Sustained Below 05 F) 8, Min. OVERHANG 12, MIN. -
Page 24: Combustion Blower
Service Manual Single Stage Multi Position Furnace Concentric Vent Sidewall Concentric Vent Roof Installation Figure 27 Figure 28 Attachment Vent Maintain 12″ min. clearance Strap above highest anticipated 3″ x 2″ Bushings or (Field Supplied) ″ Bushings snow level. Max. of 24″ above Combustion 3″... -
Page 25: Condensate Drain Trap
Service Manual Single Stage Multi Position Furnace CONDENSATE DRAIN TRAP CAUTION This furnace removes both sensible and latent heat from the products of combustion. Removal of the latent heat re- sults in condensation of the water vapor. The condensate is FROZEN AND BURST WATER PIPE HAZARD removed from the furnace through the drains in the plastic Failure to do so may result in burst water pipes,... -
Page 26: Sequence Of Operation
Service Manual Single Stage Multi Position Furnace 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 27 Service Manual Single Stage Multi Position Furnace 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.
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Page 28: Checking Flame Current
Service Manual Single Stage Multi Position Furnace CHECKING FLAME CURRENT Flame Rectification is a process of converting Alternating Checking Flame Sensor Current (A.C.) into Direct Current (D.C.) During the ignition Figure 31 sequence, an alternating current (A.C.) Voltage is applied to the Flame sensor. - Page 29 Service Manual Single Stage Multi Position Furnace lected” for each particular installation to insure proper op- Blower Performance Data Table 12 eration. 75,0000 BTUH The criteria for selecting the proper blower speeds IS NOT “High for Cooling, Low for Heating”. Although that may be Air Delivery in Cubic Feet per Minute (CFM) how it works out SOMETIMES, it can (in many cases) be (Furnace Rated @ 0.5″...
- Page 30 Service Manual Single Stage Multi Position Furnace Continuous−Fan Operation using G" Heating and Continuous Blower Speed the Energizing the “G” terminal on the furnace control provides contin- Same uous fan operation. This is done by connecting the G terminal of the thermostat to the G terminal on the furnace control.
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Page 31: Blower Performance Data
CIRCULATION AIR BLOWER DATA For 050 Models 3 Ton Units For 080 Models 4 Ton 19, & 22 , Units Speed Speed Med L Med H Med L Med H 1083 1301 1408 1109 1527 1850 1050 1242 1347 1087 1482 1791 1028... -
Page 32: Wiring Diagram
Wiring Diagram FURNACE CONTROL J1 COOL ON DELAY: 5 SEC COOL OFF DELAY: 90 SEC HEAT ON DELAY: 30 SEC EAC + HUM 1.0A MAX COMBINED HEAT HEAT HEAT HEAT OFF-DELAY OFF-DELAY OFF-DELAY OFF-DELAY C AP AC IT OR P R INT E D C IR C UIT B OAR D NOT E #5 NOT E #2... -
Page 33: Technical Service Data (N9Mp1 C1)
Model Specifications Manufacturers Number (Mfr No −See Rating Plate) ALL Models Specifications (N9MP1) N9MP1050B12C N9MP1075B12C N9MP1080F16C N9MP1100F14C N9MP1100J20C N9MP1125J20C General Gas Type Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Input (Btuh) 50,000 75,000 80,000 100,000... -
Page 34: Technical Service Data (N9Mp2 C1)
Manufacturers Number (Mfr No −See Rating Plate) ALL Models Specifications (N9MP2) N9MP2050B12C N9MP2075B12C N9MP2080F16C N9MP2100F14C N9MP2100J20C N9MP2125J20C General Gas Type Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Input (Btuh) 50,000 75,000 80,000 100,000 100,000 125,000 Output (Btuh) 45,500 68,000... -
Page 35: Technical Service Data (*9Mpd C1)
Manufacturers Number (Mfr No −See Rating Plate) ALL Models Specifications (*9MPD) *9MPD050F12C *9MPD075F12C *9MPD080J16C *9MPD100J14C *9MPD100J20C *9MPD125L20C General Gas Type Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Nat./ LP Input (Btuh) 50,000 75,000 80,000 100,000 100,000 125,000 Output (Btuh) 46,000 69,000... -
Page 36: Troubleshooting Guide
Service Manual Single Stage Multi Position Furnace TROUBLESHOOTING GUIDE SELF DIAGNOSTICS Self Diagnostics (via an LED provided on the furnace control) assist the Technician with troubleshooting. If the LED is flash- ing, the trouble is LIKELY (see below) to be external to the control. Certain failures of the furnace result in a specific Flash Sequence (see below) being displayed by the LED. -
Page 37: Diagnostic Code Section
Service Manual Single Stage Multi Position Furnace Diagnostic Code Section Heartbeat LIMIT CIRCUIT FAULT − Indicates the limit, flame NOT USED ON SINGLE STAGE NO PREVIOUS CODE − Stored codes are erased rollout switch is open. Blower and inducer will run after 72 hours. -
Page 38: Troubleshooting Chart #1
Service Manual Single Stage Multi Position Furnace Troubleshooting Chart #1 Start Continuous Fan Operation Check Thermostat in “OFF” Is Diagnostic LED position. “Heartbeat” on Flashing a Code? Diagnostic LED Go to Diagnostics Code Place Thermostat fan Section switch in “ON” position Does indoor blower run on Is there a “Heartbeat”... -
Page 39: Troubleshooting Chart #2
Service Manual Single Stage Multi Position Furnace Troubleshooting Chart #2 Cooling Cycle Start Operation Check Place Thermostat switch in “AUTO” position Place Thermostat in “COOL” and calling for operation Does indoor blower run on Are 24 Volts present Are 115 Volts present across Check supply circuit Cooling speed? across “R”... -
Page 40: Troubleshooting Chart #3
Service Manual Single Stage Multi Position Furnace Troubleshooting Chart #3 Heating Cycle Continued from Chart #2 Operation Check Place Thermostat in “HEAT” Is Diagnostic LED Flashing Refer to Diagnostic and calling for operation a Code Code Section Replace Fuse Check for Is Diagnostic LED Flashing Does combustion Are 24 Volts Present... - Page 41 Service Manual Single Stage Multi Position Furnace Troubleshooting Chart #3 Heating Cycle Continued from Page 38 Operation Check Are 115 Volts Present at control Replace Furnace Control Board Does indoor blower “Heat” & Neutral terminals? start after “ON” delay? Place Thermostat in “OFF” Check blower motor, capacitor, Removing call for Operation and/or wiring...
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Page 42: Index
INDEX Exhaust Blower, 22 Adjusting Heat Anticipator, 12 Adjusting Manifold Pressure, 6 Flame Current, Checking, 26 Air Proving Switch, See Pressure Switch Furnace Theory of Operation, 3 Furnace Control Board, 25 Blower Assembly, Conditioned Air, 26 Gas Valve/Ignition Control, Honeywell VR8205S, 11 Blower Speeds, Changing, 27 Ground, Electrical, 4 Blower Speeds, Selecting, 26... - Page 43 INDEX Temperature Rise, 11 Thermostat, Room, 12 Roll Out Limit Switch, 14 Transition Pressure Switch, 14 Room Thermostat, 12 Troubleshooting Charts, 34−39 Troubleshooting Guide, 13 Twinning Kits, 13 Sequence of Operation Chart, 24 Supply, Electrical, 4 Supply, Gas, 5 Unit Identification, 3 Switch, Blower Door Interlock, 5 Switch, Transition Pressure, 14 Switch, L.P.