Downflow, Direct Vent (Sealed Combustion) Forced Air Gas & Oil Furnaces Installation Instructions Series M1B, M1G, M1M & M5S For installation in: • Manufactured Homes • Recreational Vehicles, Park Models, & Manufactured Buildings • Modular Homes/Buildings ATTENTION INSTALLERS: It is your responsibility to know this product better than your customer.
SAFETY INFORMATION .............................. 3 REQUIREMENTS & CODES ........................ 3 GENERAL INFORMATION ........................... 5 Warranty Information ................................ 5 Minimum Clearances ............................... 5 Applications ............................................. 6 Unit Location ............................................ 6 CIRCULATING AIR REQUIREMENTS ......... 7 Return Air Connections ........................... 7 Supply Air Connections ..............
SAFETY INFORMATION Safety markings are used frequently throughout this manual to designate a degree or level of seriousness and should not be ignored. WARNING indicates a potentially hazardous situation that if not avoided, could result in personal injury or death. CAUTION indicates a potentially hazardous situation that if not avoided, may result in minor or moderate injury or property damage. WARNING: WARNING: Do not use this appliance if any part has been submerged under water.
a.) A carbon monoxide (CO) detector and alarm shall be placed on each floor level where there are bedrooms. The detector shall comply with NFPA 720 (2005 Edition) and be mounted in the living area outside the bedroom(s). b.) A (CO) detector shall be located in the room that houses the appliance or equipment and shall: • Be powered by the same electrical circuit as the appliance or equipment.
• American National Standard (ANSI-119.2/ NFPA-501C) for all recreational vehicle installations. • CANADA: CAN/CGA-B149.1 and .2–M00 National Standard of Canada. (NSCNGPIC) GENERAL INFORMATION M a n u f a c t u r e r W a r r a n t y - O w n e r ’s Responsibilities It is the sole responsibility of the homeowner to make certain the gas furnace has been correctly set up and converted to the proper fuel (L.P. gas or Natural gas) and adjusted to operate properly.
" (152 mm) Top Clearance Removable access panel should be installed above furnace door frame to access roof jack 0" Side Clearance to Furnace Cabinet 1 (457 8" mm) Nearest Wall or Partition Figure 1. Alcove Installation Provide min. 235 sq. in. (1516 cm 2 ) open free area in front or side wall or In closet door located at top, center or bottom 6" (152 mm) Top Clearance 0" Side Clearance to Furnace Cabinet (1526" mm) CLOSET DOOR Figure 2. Closet Installation Provide min. 250 sq. in.
CIRCULATING AIR REQUIREMENTS WARNING: Do not allow combustion products to enter the circulating air supply. Failure to prevent the circulation of combustion products into the living space can create potentially hazardous conditions including carbon monoxide poisoning that could result in personal injury or death. All return ductwork must be secured to the furnace with sheet metal screws. For installations in confined spaces, all return ductwork must be adequately sealed.
Location, size, and number of registers should be selected on the basis of best air distribution and floor plan of the home. The supply air must be delivered to the heated space by duct(s) secured to the furnace casing, running full size and without interruption. • The M1 Series gas and M5 Series oil furnace is certified for use on wood flooring or supports, but must be installed on top of a duct connector.
20" 14 1/2" 2 3/4" FLOOR OPENING CL “X” REAR WALL OF CLOSET OR ALCOVE SUPPLY AIR DUCT FLOOR CAVITY 10" FURNACE OUTLINE 24" 23 1/4" 21 3/4" 14 1/2" 2 1/4" Figure 9. Floor Cavity FLOOR CUT-OUT FOR STANDARD DUCT CONNECTORS CL If Floor Cavity “X” is: CL CUT-OUT FOR OPTIONAL COOLING COIL CL CL 1 3/4" 3/4" CL CL 1 3/4" 3/4" 1 7/8" 2 7/8" ALT FUEL-LINE ENTRY 1 1/4" Dia. FUEL LINE FURNACE OUTER DOOR 2" Figure 6.
Duct connector tabs Staples or sheet metal screws DUCT CONNECTOR SUPPLY AIR DUCT Sheet metal screws Figure 10. Duct Connector Tabs NOTE: Requirements for sealing ductwork vary from region to region. Consult with local codes for requirements specific to your area. OPTION 2 Cut Here Fold Flap Here Fold Flap Here Fold Flap Here tH Cu ere tH Cu ere Cu ere Cut Here Remove this Flap Cut Here Cut Here tH ere tH Cu Fold Flap Here Supply Air Duct Figure 11.
SCREWS DUCT CONNECTOR MOUNTING PLATE FUEL LINE HOLES 14” SUPPLY CONNECTION Figure 13. Round Duct Connector Installed SLIDE FURNACE ALL THE WAY BACK ONTO MTG. PLATE MTG. PLATE TABS SECURE FURNACE WITH 2 FASTENERS AT FRONT CORNER HOLES ROOF JACK INSTALLATION Required ceiling and roof cut-out openings (see Figure 11) must be carefully located to avoid misalignment of the furnace and Roof Jack. Note: Install only Roof Jack Assemblies listed in Table 4 on this heating appliance. Roof Jack Selection 1.
1. Locate center of Roof Jack opening, measure 13 1/2” from the rear wall of closet or alcove along the center line of furnace and floor opening. See Figure 19. 2. Cut ceiling and roof holes as follows: • Ceiling = 8 3/4” (222 mm) diameter • Roof = 9 3/8” (238 mm) diameter IMPORTANT: Figure 17.
Installing The Roof Jack 1. Apply caulking compound on underside of roof flashing to form a continuous strip at least 3/8” wide around the underside of the perimeter of the flashing. See Figures 20 or 21. 2. Connect Roof Jack Assembly to the furnace. Insert telescoping Roof Jack Assembly through the opening cut on the roof. 3. Connect flue pipe to flue collar of furnace. See Figure 22. 4. Connect combustion air pipe to furnace collar with sheet metal screw (See Figure 22).
4. The four warning tags supplied must be installed as follows: • To weather cap • To fuel line connection point (Gas) or furnace burner (Oil) • To furnace flame observation door (Gas or Oil) • To furnace wall thermostat 5. Transit-mode weather cap to be removed and upper Roof Jack crown installed (See Figure 24). Do Not Discard screws. 6. Place upper Roof Jack (crown) on to the flue pipe assembly. NOTE: Make sure inside flue pipe attaches over inner flue pipe and outer Roof Jack pipe fits over outer pipe.
Connecting Power Supply Wires 1. Remove the furnace control panel cover. 2. Route wires (115 VAC) through the strain relief on the left side of the furnace control box (see Figure 24). 3. Connect the hot wire to the black pigtail lead, and the neutral wire to the white pigtail lead. Secure all connections with suitable wire nuts. 4. Connect the ground wire to the grounding screw. 5. Reinstall the control panel cover and secure with the original mounting screws.
FUEL SUPPLY AND PIPING WARNING: All piping must conform with local building codes, or in the absence of local codes, with the most recent edition of the National Fuel Gas Code ANSI Z223.1 or (CAN/CGA B149.1 or .2). Failure to follow all safety warnings could result in serious injury, death or property damage. This furnace may be installed with left or right side gas entry.
For L.P. gas, pressure to the gas valve must be more than 11” W.C. but not more than 13” W.C. Pressure is reduced to 10” W.C. by the pressure regulator in the gas valve. CAUTION: Furnace conversion must be performed by a qualified technician. Improper conversion can cause unsafe operation, explosion, fire and/or asphyxiation. Oil Tank and Piping Installation The following procedures are recommended as good practice. However, requirements of local codes and ordinances, H.U.D.
5. Open the furnace door and connect the oil line to the intake port on the pump. Tighten other port plugs on the pump. NOTE: Verify the oil line is airtight! Air leaks can cause the pump to lose prime and will create other problems such as nozzle failure, odors, rumbling noise, and false safety shutdown. 6. Insert the short length of the copper tube level with the bottom of the duplex bushing. Form the tube into an inverted “U” to serve as a vent.
L NA T PRESSURE REGULATOR CAP NA OTHER SIDE OF CAP T T This furnace is shipped from the factory with orifices and gas regulator settings for natural gas operation at sea level altitudes. At 2000 feet, the NFGC requires that this appliance be derated 4% for each 1000 feet of altitude. For example, the input needs to be reduced 8% at 2,000 feet, 12% at 3,000 feet and etc. This deration is in reference to the input rate and gas heating value at sea level. See Table 12 (page 32).
STARTUP AND ADJUSTMENTS PLEASE READ ALL SAFETY INFORMATION BEFORE LIGHTING THE FURNACE WARNING: FIRE OR EXPLOSION HAZARD WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Leave the building immediately. • Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions. • If you cannot reach your gas supplier, call the fire department.
12. Set the thermostat mode to HEAT or a desired temperature setting and then ON. Should overheating occur, or the gas supply fails to shut off, shut off the manual gas valve to the furnace before shutting off the electrical supply. 1. Set the thermostat to the lowest setting. 2. Turn off all electric power to the appliance. 3.
How to Shut Off Gas - Direct Ignition 1. Set the thermostat to the lowest setting. 2. Turn off all electric power to the appliance before servicing unit. 3. Set the furnace On-Off Switch to OFF. • Honeywell (Figure 32):Turn gas control knob clockwise to OFF, Robertshaw (Figure 33): Push the gas control lever to OFF. • For oil, shut off all valves. 4. Replace the furnace door.
Combustion Air In order for the flame to burn efficiently, it must receive adequate combustion air. The amount of combustion air required varies according to altitude, actual B.T.U. content of the fuel, gas pressure, conversion to another gas and other factors. The burner flame should be observed and any necessary adjustments made before the furnace is placed into service. See Table 7 for Factory Air settings. CAUTION: • Combustion air adjustment must be made only by a qualified technician.
OPERATING SEQUENCE Standing Pilot 1 On a call for heat, the thermostat contacts close, supplying 24 VAC to the gas valve.When energized, the valve steps open at a reduced flow and opens fully within 14 seconds. 2. When the call for heat is satisfied, the thermostat contacts open, shutting off gas flow. Standing Pilot w/Induced Draft Blowers 1. On a call for heat, the thermostat contacts close, supplying 24 VAC to the relay. 2. The relay contacts close and the induced draft motor energizes. 3.
4. When call for heat is satisfied, the thermostat contacts open and the gas valve shuts off gas flow. WARNING: Should overheating occur, or the gas supply fails to shut off, shut off the manual gas valve to the furnace before shutting off the electrical supply. AVERTISSEMENT: En case de température excessive, ou sail est impossible de cooper l’alimentation en gaz, fermer le robinet manuel d’alimentation en gaz du générateur d’sir chaud avant de cooper l’alimentation électrique.
TROUBLESHOOTING Standing Pilot Models Main Burner Does Not Ignite 1. Check the electrical supply to the furnace. 2. Verify the furnace furnace On-Off switch is in the ON position. 3. Check for proper thermostat operation. 4. Check for broken or open thermostat wires. 5. Verify the insulation located on the inside of the front panel is glued securely around the fan switch and the limit switch. 6. Shut off the electrical supply to the furnace and remove the electrical box cover. 7.
120 VAC Is Available At AMP Plug - Ignitor Does Not Heat Up 1. Disconnect power to the furnace. 2. Disconnect AMP plug to the ignitor, and check ignitor resistance with an ohm meter. Set on RX1 scale. • Normal reading should be 40 - 75 ohms. • If above or below this rating at room temperature change ignitor. 3. Check for continuity from ignitor receptacle to burner. Main Flame Ignites - Burner Locks Out • Ignition control is not properly grounded. • Defective ignition control.
the cad cell is operational, replace the primary control. 4. If the LED continues to flash at the interval listed above, verify that the control is not in restricted mode. If in restricted mode, reset it. If not in restricted mode, replace the control. 5. If the (LED indicator for R7184 control; green LED for 7505 control) stays off while the flame is on, check the cad cell sighting for view of the flame. 6. If the burner locks out, check the cad cell resistance. (See Table 8) 7.
Control Module Status Indicators - M1M Series Red LED Indicator Status Steady ON Control OK Steady OFF No power Rapid flash False flame or internal control fault One flash Limit switch is open Two flashes Pressure switch is open Three flashes Pressure switch is stuck closed Four flashes Lockout due to failed ignition Five flashes L1 neutral reversed or L1 voltage not present on L1 Flame Status - A Yellow LED labeled “Flame” is provided to indicate flame status.
OPTIONAL ADD-ON AIR CONDITIONING Whether split system or single package, an energy-saving NORDYNE Air Conditioner is available that has been designed specifically for manufactured housing applications and can best handle your home comfort needs. Ask your dealer or contractor about NORDYNE add-on central air conditioning systems. Single package unit includes cooling coils, compressor, and vertical discharge fan.
66 66 86 86 M5SB 066 M5SC 066 M5SB 086 M5SC 086 NOTES: 56 70 77 90 56 56 70 70 77 77 90 90 66 66 86 86 M1GB 056 M1GB 070 M1GB 077 M1GB 090 M1MB 056 M1MC 056 M1MB 070 M1MC 070 M1MB 077 M1MC 077 M1MB 090 M1MC 090 M1BB 066 M1BC 066 M1BB 086 M1BC 086 56 56 73 73 45 57 62 72 46 46 57 57 62 62 72 72 53 53 68 68 Output MBtu/h .50 Gph .50 Gph .65 Gph .65 Gph 29 24 21 17 29 29 24 24 21 21 17 17 26 26 18 18 45 42 40 36 45 45 42 42 40 40 36 36 43 43 37 37 Orifice No Nat. LP 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.
FURNACE MODEL ALTITUDE - FEET SEA 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 LEVEL ORIFICE SIZE AND OUTPUT CAPACITY Orifice Size - Nat. Gas M1M/M1G Orifice Size - LP - 056 Output - MBTUH Orifice Size - Nat. Gas M1M/M1G Orifice Size - LP - 070 Output - MBTUH Orifice Size - Nat. Gas M1M - 077 Orifice Size - LP Output - MBTUH Orifice Size - Nat. Gas M1G - 077 Orifice Size - LP Output - MBTUH Orifice Size - Nat. Gas M1M - 090 Orifice Size - LP Output - MBTUH Orifice Size - Nat.
GAS INFORMATION GAS FLOW RATES TIME FOR ONE REVOLUTION (SECONDS) GAS FLOW RATES CUBIC FEET PER REVOLUTION OF GAS METER 1 5 10 CUBIC FEET PER REVOLUTION OF GAS METER 1 5 10 TIME FOR ONE REVOLUTION (SECONDS) 10 360 1,800 3,600 66 55 273 545 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 300 257 225 200 180 164 150 138 129 120 113 106 100 95 90 86 82 78 75 72 69 67 64 62 60 58 56 1,500 12,86 1,125 1,000 900 818 750 692 643 600 563 529 500 474 450 429 409 391 375
L1 NEUTRAL ON/OFF SWITCH Figure 40. Gas Atmospheric Furnace, M1GH 056, 070 Models FAN ON/AUTO SWITCH GROUND SCREW SUPPLIED BY INSTALLER TRANSFORMER GRAY WHITE COMMON FOR OPTIONAL ACCESSORY KITS C R W GAS VALVE R L1 FURNACE ELECTRICAL BOX GRAY WHITE ORANGE ORANGE BLACK BLACK CONNECTOR HOUSING CAP 2. If any of the original wires (as supplied with the appliance) must be replaced, use 105˚C Thermoplastic type wire or its equivalent.
Figure 41. Standing Pilot with Induced Draft Furnace, M1GH 077, 090 Models 35 L1 NEUTRAL ON/OFF SWITCH FAN ON/AUTO SWITCH GROUND SCREW SUPPLIED BY INSTALLER BLACK 6 3 5 1 4 2 BLACK GAS VALVE BUSHING GRAY WHITE ORANGE ORANGE BLACK BLACK GRAY BLUE C R W WHITE GRAY N BLUE BLACK WHITE WHITE 115 V 24 V C BLACK HI-LIMIT BLUE FURNACE ELECTRICAL BOX L1 TRANSFORMER R 1 2 3 4 5 6 BLACK BLOWER MOTOR HEATING ONLY CONNECTOR HOUSING CAP BLACK 2.
Figure 42. Gas Atmospheric Furnace, A/C Ready, M1GB 056, 070 Models L1 LEGENDS 115V: 24V: NEUTRAL ON/OFF SWITCH FIELD 115V: FIELD 24V: GROUND SCREW SUPPLIED BY INSTALLER WHITE 6 3 51 4 2 BLUE * 3 SPEED BLOWER MOTOR WHITE 24 V L1 115 V R HI-LIMIT WHITE C N BLUE BLUE BLUE BLACK WHITE BLACK GRAY 3A FUSE FAN SWITCH BLUE AUX.
Figure 43. Standing Pilot with Induced Draft Furnace, A/C Ready M1G (B, C, D) 077, 090 Models 37 2. If any of the original wires (as supplied with the appliance) must be replaced, use 105˚C Thermoplastic type wire or its equivalent. NOTES 1. Incoming power must be polarized. Observe color coding. (See furnace data label for electrical information.
Figure 44. Gas Direct Ignition Furnace, Heating & A/C Ready - All M1M Models 38 2. If any of the original wires (as supplied with the appliance) must be replaced, use 105˚C Thermoplastic type wire or its equivalent. 1. Incoming power must be polarized. Observe color coding. (See furnace data label for electrical information.
Figure 45. Gas and Oil Furnaces, A/C Ready - M1B & M5S (066, 086) Models 39 GROUND SCREW SUPPLIED BY INSTALLER HIGH VOLTAGE LOW VOLTAGE LEGEND: FIELD WIRING NEUTRAL L1 ON/OFF SWITCH BLUE (MEDHI) RED (LO) BLACK (HI) RECEPTACLE TIE WIRE 1 2 3 4 5 6 2 120 Volt ORANGE GREEN TRANSFORMER FURNACE ELECTRICAL BOX BLACK ORANGE WHITE WHITE BLACK BLACK CONNECTOR HOUSING CAP WHITE R C W G C R W 115 V L1 N C BUSHING WHITE 24 V R GRAY HI-LIMIT BLUE FAN SWITCH BLUE AUX. LIMIT 4.
INSTALLATION / PERFORMANCE CHECK LIST ELECTRICAL SYSTEM: INSTALLER NAME: CITY _______________ STATE ____________ INSTALLATION ADDRESS: CITY _______________ Electrical connections tight? YES NO Line voltage polarity correct? YES NO Supply Voltage: ______________________ VOLTS STATE ____________ UNIT MODEL # Has the thermostat been calibrated? YES NO Is the thermostat level? YES NO Is the heat anticipator setting correct? YES NO Natural Gas Propane YES NO UNIT SERIAL # GAS SYSTEM:
