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Nordyne M3RL Series Installation Instructions Manual

Direct vent (sealed combustion) forced air gas furnaces m3rl series 90+ downflow condensing furnace
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See also: Maintenance and Service Manual
Direct Vent (Sealed Combustion) Forced Air Gas Furnaces
Installation Instructions
M3RL Series 90+ Downflow Condensing Furnace
For installation in:
1. Manufactured Homes
2. Park Models and Manufactured Buildings
3. Modular Homes/Buildings
WARNING:
!
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
– Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
– 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 neighbor's
phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire
department.
– Installation and service must be performed by a
qualified installer, service agency, or the gas sup-
plier.
!
ADVERTISSEMENT:
RISQUE D'INCENDIE OU D'EXPLOSION
Le non-respect des avertissements de sécurité
pourrait entraîner des blessures graves, la
mort ou des dommages matériels.
– Ne pas entreposer ni utiliser de l'essence ni
d'autres vapeurs ou liquides inflammables dans le
voisinage de cet appareil, ni de tout autre appareil.
– QUE FAIRE S'IL Y A UNE ODEUR DE GAZ
• Ne pas tenter d'allumer aucun appareil.
• Ne toucher à aucun interrupteur électrique;
n'utiliser aucun téléphone dans le bâtiment.
• Évacuer l'immeuble immédiatement.
• Appeler immédiatement le fournisseur de gaz en
employant le téléphone d'un voisin. Respecter à
la lettre les instructions du fournisseur de gaz.
• Si personne ne répond, appeler le service des
incendies.
– L'installation et l'entretien doivent être effectués
par un installateur qualifié, un organisme de
service ou le fournisseur de gaz.
LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER.
BW Models
!
WARNING:
Should overheating occur, or the
gas supply fail to shut off, shut
off the manual gas valve to the
appliance before shutting off the
electrical supply.
Improper installation, adjust-
ment, alteration, service or
maintenance can cause injury
or property damage. Refer to
this manual. For assistance or
additional information consult
a qualified installer, service
agency or the gas supplier.
BWT Models

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Summary of Contents for Nordyne M3RL Series

  • Page 1 Direct Vent (Sealed Combustion) Forced Air Gas Furnaces Installation Instructions M3RL Series 90+ Downflow Condensing Furnace For installation in: 1. Manufactured Homes 2. Park Models and Manufactured Buildings 3. Modular Homes/Buildings WARNING: FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury, death or property damage.

  • Page 3: Table Of Contents

    Blower Compartment ... 30 Heat Exchanger and Burner Maintenance ... 30 System Operation Information ... 30 Sequence of Operation ... 30 Furnace Fails to Operate ... 31 Location of Major Components ... 32 Wiring Diagram ... 33 Installation/Performance Checklist ... 35 Heating Capacity Input, BTUH (000’)

  • Page 4: General

    20-9/32 1-19/32 1-19/32 3-17/32 3-17/32 4-11/16 4-11/16 Figure 1. Furnace Dimensions Top Return Knockouts Top View (AW and BW Models) Furnace Specifications / Airflow Data Furnace Furnace Temp. Furnace Input Output Rise @ Motor Model No. Btuh Btuh .3"WC °F...

  • Page 5: Owner's Information

    Table 3. Table 2 lists the shipping weights for the M3 series furnaces. OWNER INFORMATION NORDYNE has been involved in the design of products for the manufactured home industry since the first manufactured home or trailer was built.

  • Page 6: Installation Requirements

    Write directly to the factory (PO Box 8809, O’Fallon, MO 63366) if you are not able to locate a source for NORDYNE manufactured housing products in your area. MANUFACTURER WARRANTY, OWNER’S...

  • Page 7: Location

    Table 4. Minimum Clearances bustible material other than wood flooring. The furnace may be installed on combustible floor- ing when installed on a Nordyne duct connec- tor (see Table 5). The ductwork within 3 feet of the furnaces without the A/C coil box must be installed such that surfaces are at least 1/4"...

  • Page 8: Return Air Provisions

    Closet installations must use a louvered door having a minimum free area of 235 sq. in. when located 6” from furnace. For clear- ance between 1” and 6” from furnace, re- quirements are a louvered door with mini- mum of 235 sq.

  • Page 9: Air Distribution Systems

    Refer to Table 12 for the NORDYNE ducted return kit P/N number. The location and size of the side and top return air connections are shown in Figure 1.

  • Page 10: Duct Connector Selection

    DUCT INSTALLATION Required floor, ceiling, and roof cut-out open- ings must be carefully located to avoid mis- alignment of the furnace (see Figures 6 & 7). Installation procedures are suggested for typi- cal furnace installations and need not be fol- lowed in the exact listed sequence.
  • Page 11 5-1/4" to the left of center of the floor cut-out, or for entry through right-side of furnace measured 9" to the right of center of the floor cut-out. d. Cut out floor opening and one gas line hole. CUT DUCT OPENING (FINGER TABBED ONLY) a.
  • Page 12 ALTERNATE ATTACHMENT METHODS This procedure may also be used to install a furnace duct connector to narrow metal ductwork where insufficient clearance prevents bending of the duct connector tabs at the side(s) of the duct. (See Figure 12).

  • Page 13: Venting And Combustion Air Requirements

    CAUTION: Snow must not be allowed to restrict or block the combustion air intake or vent pipes. General NORDYNE condensing furnaces must be installed with outdoor combustion air piped SLIDE FURNACE ALL THE WAY BACK ONTO MTG. PLATE directly to the furnace. Codes refer to this type of installation as direct vent, or two pipe installation.

  • Page 14: Venting Requirements

    Therefore, vent and combustion air piping lengths must conform completely to the requirements of Table 6. The furnace must be vented to the outdoors. WARNING: CARBON MONOXIDE POISONING HAZARD 1. Seal any unused openings in the venting system 2.

  • Page 15: Vent Table

    MAXIMUM DIRECT VENT, DUAL APPLICATION PIPE LENGTH (ft.)* Inlet/Outlet PVC,CPVC or ABS SCH. 40 Pipe Size 3" Model M3RL 060 Model M3RL 080 VENT TERMINAL A = Clearance above grade, veranda, porch, deck, or balcony B = Clearance to window or door that may be opened C = Clearance to permanently closed window D = Vertical clearance to ventilated soffit...

  • Page 16: Vent Pipe Material

    Do not vent the furnace to a fireplace chimney or building chase. If removing an existing furnace in a venting system, the venting system may not be properly sized. To test the vent system with the remaining appliances, follow the test outlined below.
  • Page 17 Figure 17. Vertical Venting Select the point of wall penetration where the minimum 1/4 inch per foot of slope up can be maintained. For optimal performance vent furnace through wall which experiences the least exposure to winter winds. 3 9/16"...

  • Page 18: Horizontal Venting

    Fig. 19. Improper vent termination can cause recirculation of the flue gases. This may result in furnace vibration. In severe cases, the furnace will cycle, due to the intermittent contact between the flame and the flame sensor.

  • Page 19: Vent Freezing Protection

    The condensate should drain from the plastic collector box (location A in Figure 21) as drop- lets or a small stream. If you notice the furnace has operated for more than 5 minutes without draining or the red status light on the control board is pulsing a 2-blink code follow the steps below.

  • Page 20: Gas Supply And Piping

    (See Table 12). Proper drains and connections to the condensate tub- ing are required as NORDYNE cannot be held responsible for water leakage which occurs due to loose hose connections or improperly sealed drain line pipes.

  • Page 21: Leak Check

    To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value of the gas:...
  • Page 22 Note that the gas manifold assembly consists of the gas valve, the gas manifold, and the orifices. Carefully remove the burner orifices from the gas manifold, as shown in Figure 25. Furnace Rating Furnace No. of Plate Input Model Number...

  • Page 23: Lighting And Adjustment Of The Appliance

    Reinstalling the Burner Assembly: Reinstall the gas manifold assembly to the burner box with the four (4) fasteners, which were removed earlier. Carefully reinstall the burner box into the unit. After installing the burner, inspect the alignment of the burners with the heat exchanger tubes.

  • Page 24: Electrical Wiring

    Do not use an open flame to check for gas leaks. Manifold Pressure The gas valve for the M3 furnace series is equipped with a special conversion pres- sure regulator cap. The pressure regulator cap is factory set. If the gas valve is con-...
  • Page 25 "hot" line is connected to the black wire in the furnace junction box. The furnace will not operate unless polarity and ground are properly connected. See Figure 26. CAUTION: Label all wires prior to disconnection when servicing controls.

  • Page 26: Low Voltage Wiring

    Prior to start-up, verify that: The line voltage power leads are securely connected, that the polarity of the con- nections is correct, and that the furnace is properly grounded. The thermostat wires (R, W, Y, and G) are securely connected to the correct leads on the terminal strip of the circuit board.

  • Page 27: Shut Down Procedure

    9 - 11 of the SEQUENCE OF OPERATION. Shut Down Procedure In the event that the furnace must be shut down, follow this procedure: Set the room thermostat to "OFF" or its lowest temperature setting.

  • Page 28: Verifying Burner Operation

    Completely block the return airflow to the furnace by install- ing a close-off plate in place of or upstream of the filter(s). Set the thermostat above room...

  • Page 29: Furnace Accessories

    Vent Safety Switch – The vent safety switch shuts the furnace down if the outlet flue gas temperature increases above 145°F. This switch protects the plastic flue system and the inducer from over-temperature conditions.

  • Page 30: Lubrication

    Follow these instructions for years of safe, trouble free operation. • Do not place combustible materials on or against the furnace cabinet or the vent pipe. • Do not store gasoline or any other flammable vapors and liquids in the vicinity of the furnace.

  • Page 31: Furnace Fails To Operate

    Is the flame sensor coated? (Remove and clean with emery cloth.) Is the deck switch open? If the furnace locks out after 5 attempts for ignition, it will try again every hour if a call for heat remains. If the inducer and circulating air...

  • Page 32: Location Of Major Components

    M3 Downflow Furnace Door Assembly - Louvered Filter Inside Door Blower Assembly Control Board Pressure Switch Flame Rollout Switch “J” Trap Hard Tube Low Voltage Transformer In Line Drain Assembly 10 Junction Box 11 Vent Safety Switch Figure 29. Location of Major Components...

  • Page 33: Wiring Diagram

    5 FLASHES False Flame or Gas Valve Relay Shorted Continuous Power Off or Deck Limit Open YELLOW FAULT CONDITION Low Flame Sensor Signal Continuous Flame Present Figure 30. Downflow Furnace Wiring Diagram VENT SAFETY SWITCH (ALL MODELS) WHITE BLACK GREEN TRANSFORMER...

  • Page 35: Installation/Performance Checklist

    Natural Gas ______ LP/Propane _______ Gas Piping Connections leak-tested? _____ Gas Line Pressure: ____________________ (in. water column, with furnace operating) Manifold Pressure: ____________________ (in. water column, with furnace operating) Is there adequate fresh air supply for combustion and ventilation? _____________ Furnace Input: _________________ Supply Air Temperature: __________ (°...
  • Page 36 ¢7082197¤ 708219D 708219D (Replaces 708219C) Specifications and illustrations subject to change without notice and without incurring obligations. Printed in O’Fallon, MO U.S.A. (04/04)

This manual is also suitable for:

M3 rl-060M3 rl-080

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