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Downflow, Direct Vent (Sealed Combustion)
Forced Air Gas and Oil Furnaces
Owners Manual/Installation Instructions
Series M1B, M1G, M1M and M1S
For installation in:
1.Manufactured Homes
2.Recreational Vehicles, Park Models,
Manufactured Buildings
3. Modular Homes/Buildings
!
WARNING:
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
– Do not store or use gasoline or other
flammable vapors and liquid
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TABLE OF CONTENTS 1. SPECIFICATIONS ...................................................................................3 2. OWNERS INFORMATION ....................................................................... 3 3. MANUFACTURER WARRANTY, OWNER RESPONSIBILITY .................3 4. INSTALLATION STANDARDS .................................................................5 5. UNIT LOCATION .....................................................................................6 6. MINIMUM CLEARANCE
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NORDYNE originated the sealed combustion system, which separates the furnace combus- ! WARNING: tion system from the living area of the home, now a standard for the manufactured home Do not use this appliance if any part industry. has been submerged under water. Immediately call a qualified service NORDYNE engineers developed the first cen- technician to inspect the appliance tral heating system and the first central air and to replace any part of the control conditioner for manufactured homes.
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necessary to correct problems due to improper 5. Correcting problems due to improper gas setup, improper installation, furnace adjust- supply pressure to the furnace. ments, improper operating procedure on the 6. Providing instructional training on how to part of the user, etc. light and operate the furnace. 7. Furnace problems caused by installation of Some specific examples of service calls which an air conditioner, heat pump or other air cannot be included in warranty payments are: comfort de
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18" (457 mm) 6" (152 mm) 1" (25 mm) Blower / Motor Assembly A/C Capacity Part No. Blower Wheel Motor-Hp Ton 903773 10 x 8 1/4 2, 2½ & 3 903413 11 x 8 1/2 2, 2½, 3 & 4 903414 11 x 8 3/4 2, 2½, 3, 4 & 5 Table 3. Field Installation Blower Assemblies Carefully review these responsibilities with your manufactured housing dealer, service com- 6" (152 mm) pany or gas supplier so there will be no misun- Top Clearance derstanding at a later time. ! CAUTION: Removable access panel should be 0" Side ins
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a. Federal Manufactured Home Constructions 6. MINIMUM CLEARANCES & Safety Standard (H.U.D. Title 24, Part This heating appliance must be installed with 3280.707[a][2]) clearances not less than the minimums shown b. American National Standard (ANSI-119.2/ in Table 4. This heating appliance must be NFPA-501C) for all recreational vehicle in- installed with ample clearance for easy access stallations. to the air filter, blower assembly, burner assem- c. American National Standard (ANSI-Z223.1/ bly,
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f. Noncombustible pans having 1" upturned a. Regardless of the location, the return air flanges are located beneath openings in a opening into the closet shall not be less than floor duct system. specified in the appliance’s listing. g. Wiring materials located in the return duct b. Means shall be provided to prevent inadvert- system shall conform to Articles 300-22 of ent closure by a flat object placed over the the National Electrical Code (ANSI C1/NFPA- return air opening when it is located i
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h. Gas piping is not run in or through the return b. F=Flat Flashing; flexes from 0/12 to 1/12 roof duct system. slope. i. Test the negative pressure in the closet with c. S=Slant Flashing. 2.5/12 Slope flexes from 1/ the air-circulating fan operating at high speed 12 to 4/12 roof slope, 4/12 flexes from 3/12 and the closet closed. The negative to 5/12. pressure is to be no more negative than d. Stainless steel roof jacks are available. minus 0.05 inch water column. e. If the roof jack crown is
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b. Select appropriate model from Table 7 10. DUCT CONNECTOR SELECTION which matches X-dimension of the floor PLATINUM SERIES cavity. To maximize air delivery, re- move reducer “C” (see Figure 11) to a.For Platinum ready construction use obtain the largest open area that will fit the 14” round duct connector, p/n: the duct/floor construction. Screw down 903896. duct connector opening to duct without reducer is 13” x 13”. With reducer it is NON-PLATINUM SERIES 13” x 10-1/8”. a. Determine depth of
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REAR WALL C L CEILING AND ROOF OPENINGS 13-1/2" C L ALT. FUEL LINE HOLES 10" C C L L FLOOR OPENING 23 -1/4" FUEL LINE HOLE Figure 12. Closet or Alcove 20" 14-1/2" C 2-3/4" L REAR WALL OF CLOSET OR ALCOVE FLOOR CUT-OUT FOR DUCT CONN. C L FLOOR CUT-OUT FUEL-LINE C FOR OPTIONAL L COOLING COIL 3/4" FOR NON-PLATINUM SERIES UNITS C L 2" 1-1/4" D. 10" ALT FUEL-LINE ENTRY 1-3/4" FURNACE 12-7/8" OUTER DOOR 14-3/4" 15-1/2" Figure 13. Cut-Out Locations 10 SIDE WALL CEILING CUT-OUT FOR FL
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REAR WALL UNDER DUCT OPENING MOUNTING PLATE FLOOR OPENING FUEL LINE HOLES SUPPLY AIR DUCT MOUNTING REAR WALL PLATE FLOOR OPENING FUEL LINE HOLES SUPPLY AIR DUCT CUT DUCT OPENING 1/16TH. LARGER THAN DUCT CONNECTOR 5-1/4" to the left of center of the floor cut-out, 11. INSTALLATION or for entry through right-side of furnace Required floor, ceiling, and roof cut-out open- measured 9" to the right of center of the floor ings must be carefully located to avoid misalign- cut-out. ment of the
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b. Cut ceiling and roof holes as follows: INSTALLING FINGER TABBED DUCT CON- Ceiling Hole = 8-3/4" (222 mm) diameter NECTORS Roof Hole = 9-3/8" (238 mm) diameter a. Place duct connector through the floor open- c. DO NOT ALLOW DEBRIS TO FALL INTO ing with bottom tabs extending through the THE FURNACE. THIS COULD CAUSE duct opening. (See Figure 15) UNSAFE OPERATION AND VOIDS THE b. Secure duct connector to floor. FURNACE WARRANTY. Use the top cap c. Bend bottom tabs under and up tightly against th
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bending of the duct connector tabs at the NOTE: Additional fasteners may be used at side(s) of the duct. (See Figure 18). rear, sides or through door frame, as desired, 1. Score and cut the top of the metal duct as to secure furnace to closet or alcove framing. indicated in Step 1 or Step 2. With Step 1 choice, also cut out the metal from the shaded INSTALL ROOF JACK area “A”. 2. Fold the duct flap “B” up, (See Step 3). Apply caulking compound on underside of roof 3. At the front-to-back of duct
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Roof SUPPLY AIR DUCT SUPPLY AIR DUCT Knockout Over Holes added protection against leaks, coat the flash- ing plate and fasteners with approved roofing compound. SLIDE FURNACE MTG. PLATE TABS ALL THE WAY BACK ONTO MTG. PLATE If flashing mounted on 12 degree angle is used SECURE FURNACE WITH 2 FASTENERS AT FRONT it may be necessary to adjust the angle to match CORNER HOLES the roof pitch; (1/12 - 4/12 maximum). 12. INSTALLATION OF TRANSIT- MODE VENTING SYSTEM MANUFACTURED HOME FACTORY a. Furnac
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Power supply circuit to the furnace must be c. Venting system warning tags to be removed installed and grounded in accordance with the and discarded. National Electrical code (ANSI-C1/NFPA-70), or Canadian Electric Code Part 1 (CSA 22-1) and all local codes having jurisdiction. ! WARNING: CONNECT POWER SUPPLY WIRES Failure to properly secure the flue pipe a. Remove the furnace control panel cover. to the furnace may result in fire, explo- b. Insert 115 volt wires through the strain relief sio
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cold drafts. The nominal anticipator setting is If the heat anticipator is set too low, the furnace 0.4. (Refer to the thermostat literature for addi- may cycle frequently and not provide comfort tional information.) to the homeowner. Five-conductor thermostat wire is recom- 14. FUEL PIPING mended for 24 volt low-voltage circuit (2-wire is Sizing and installation of fuel lines must be in required for furnace only; 5-wire for heating and accordance with federal, state and local regu- optional co
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Floor Cavity For natural gas operation, the furnace is de- T’STAT Recommended T’STAT Wire signed for 7" W.C. inlet pressure. Pressure is Wire Gauge Length (Unit to T’STAT) reduced to 3-1/2" W.C. by the pressure regu- 2-Wire 5-Wire lator in the gas valve. The maximum inlet (Heating) (Heating/Cooling) pressure for the valve is 13” W.C. 24 55 25 22 90 45 For L.P. gas, pressure to the gas valve must 20 140 70 be more than 11" W.C. but not more than 13" 18 225 110 W.C. Pressure is reduced to 10" W
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18 Pressure 3/8" Oil Supply Line Gauge Port Oil Flue Gas Vent with Optional 2" Duplex Furnace Sampling Nozzle Cap Return Bushing Hole Port Gauge Inlet 2" Fill Top of Tank Port R On-Off-Fan Switch Shut-off Control Air-Bleed Valve Guide pipe 8 ft. Panel Valve Optional Return Port & Inlet Internal By-Pass Alternate Drain Note: Additional
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ground. Fuel tanks may also be buried if prop- problems such as nozzle failure, odors, rum- erly coated to resist corrosion. For below ground bling noise, and false safety shutdown. fuel tank installations, the vertical dimension 7. Insert the short length of the copper tube level from the bottom of the fuel tank to the fuel pump with the bottom of the duplex bushing. Form must not exceed ten feet. Keep the tank filled, the tube into an inverted “U” to serve as a especially in the summer to redu
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d. WHAT TO DO IF YOU SMELL GAS: Do not 15. FLUE GAS SAMPLING try to light any appliance. Do not touch any It may be necessary to take flue gas sampling electric switch and do not use any phone in from oil and gas gun furnaces (M1S and M1B your building. Immediately call your gas Series Models) in order to check the perfor- supplier from a neighbor’s phone. Follow the mance after furnace installation. A flue gas gas supplier’s instructions. If you cannot sample may be taken from the heat exc
