Nordyne M3RL manual

Installation Instructions M3RL Series 90+ Downflo w Condensing Furnace Direct Vent (Sealed Combustion) Forced Air Gas Furnaces LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER. ! W ARNING: FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury, death or property damage. ! AD VER TISSEMENT : RISQUE D’INCENDIE [...]

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3 Application M-Manufactured Home Furnace Series Comfort Model RL - Condensing Downflow M 3 R L - 060 A - A W Door Color W - White G - Gray Cabinet Dimensions A - 56" x 19-3/4" x 23-3/4” B - w/Coil Cavity, 76" x 19-3/4" x 23-3/4" Electrical Code A - 1PH, 60 Hz, 120 VAC Conversion ..........................................[...]

4 19-7/8 19-7/8 24-5/8 24-5/8 56-1/16 56-1/16 20-9/32 20-9/32 21-17/32 21-17/32 21-29/32 21-29/32 21-15/16 21-15/16 19-3/16 19-3/16 23-7/16 23-7/16 28-15/32 28-15/32 3-17/32 3-17/32 4-11/16 4-11/16 4-11/16 4-11/16 3-17/32 3-17/32 EXHAUST EXHAUST VENT VENT 17-13/16 17-13/16 COMBUSTION COMBUSTION AIR AIR INT AKE INT AKE 21-11/32 21-11/32 7/8 Diameter[...]

5 ! W ARNING: Do not use this appliance if any part has been submerged under water. Im- mediately call a qualified service tech- nician to inspect the appliance and to replace any part of the control system and any gas control that has been submerged underwater. NOTICE TO INSTALLER Installer is advised to follow carefully all instruc- tions and war[...]

6 Follow the instructions in this booklet carefully and this appliance will provide many years of superior performance. If you wish to cool your home automatically with a central air conditioning system investi- gate the excellent NORDYNE cooling systems available from your heating and cooling con- tractor. These systems are designed to work best w[...]

7 CE générateur d'air chaud doit être installé conformément aux instructions du fabricant et aux codes locaux. En l'absence de code local, respecter la norme ANSI Z223.,1, institulé Na- tional Fuel Gas Code ou les codes d'installation CAN/GCA-B149. The National Fuel Gas Code is available by writing: American National Standards [...]

8 Figure 4. Figure 3. 13 1/4" 10 1/4" 19” 19" T op Vie w of Duct Connector x SUPPLY AIR DUCT FLOOR CAVITY (depth equal to "X" in Figure 5 and Table 5) RETURN AIR PROVISIONS U.S.A. home manufacturers shall comply with all of the following conditions to have accept- able return air systems for closet installed forced air he[...]

9 Figure 6. Closet or Alcove 10" 23 -1/4" FLOOR OPENING C L C L ALT. FUEL LINE HOLES SIDE WALL RE AR WALL FUEL LINE HOLE Figure 5. X SEE TABLE 5 REDUCER FELT-SEAL( 1 ) SPACERS C ( )OPENING TO DUCT (1) WITH PLATE (C) REMOVED OPENING BECOMES 13-1/4” x 13-1/4” (2) WITH PLATE (C) REMOVED OPENING BECOMES 13" X 13". WITH REDUCER I[...]

10 Figure 7. Cut-Out Locations 2-3/4 2 1-3/4 17-29/32 21-7/16 1-3/4 3-19/32 14-1/2 14-1/2 2-1/4 23-1/4 12-7/8 14-3/4 20 24 21-3/4 10 15-1/2 ˚ AL T FUEL LINE ENTR Y 1-1/4 VENT FUEL LINE ENTR Y FURNACE OUTER DOOR FLOOR CUT -OUT FOR DUCT CONNECTIONS FLOOR CUT -OUT FOR OPTIONAL COOLING COIL FOR NON-PLA TINUM SERIES UNITS FURNACE OUTLINE REAR W ALL OF [...]

11 Figure 9. Duct Connector Screw Do wn Duct Connectors Platinum Series Figure 8. Mounting Plate REAR W ALL SUPPLY AIR DUCT FUEL LINE HOLES MOUNTING PLATE FLOOR OPENING BEND CONNECTOR TABS UNDER DUCT OPENING 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 [...]

12 TABS TABS DUCT DUCT 1. INSERT DUCT PLENUM CONNECTOR INTO DUCT CUT-OUT. 2. BEND BOTTOM TABS OVER AND ONTO THE UNDERNEATH DUCT SERVICE. Staple Folded Duct Flap (typ) to side of Duct Connector Duct STEP 4. STEP 1. "A" "A" "B" "B" Cut- Out Area"A" Cut- Out Area "A" Fold Back Flap "B&qu[...]

13 MTG. PLATE TABS SLIDE FURNACE ALL THE WAY BACK ONTO MTG. PLATE S UPPLY AIR D UC T Knockout Over Holes SECURE FURNACE WITH 2 FASTENERS AT FRONT CORNER HOLES SUPPLY AIR DUCT FUEL LINE HOLES MTG. PLATE TABS SLIDE FURNACE ALL THE WAY BACK ONTO MTG. PLATE SECURE FURNACE WITH 2 FASTENERS AT FRONT CORNER HOLES Figure 13. “A”, “B”, & Platinu[...]

14 ! CA UTION: Do not allow debris to fall into the fur- nace. This could cause unsafe opera- tion and voids the furnace warranty. VENTING REQUIREMENTS ! W ARNING: FURNACE MUST NOT BE COMMON VENTED WITH OTHER APPLIANCES. General This section specifies installation requirements for 2-pipe combustion air piping. The capacity table provided in this se[...]

15 *NOTES 1 . Subtract 3.5 ft. for each additional 3" 90 degree elbow. 2 . Two 45 degree elbows are equivalent to one 90 degree elbow. 3 . One short radius elbow is equivalent to two long radius elbows. 4 . Do not include termination elbows in calculation of vent length. 5 . This table is applicable for elevations from sea level to 4000 ft. Fo[...]

16 escape through such appliances or vents. 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. The following steps shall be followed with each applia[...]

17 Figure 16. Horizontal V enting Downflow Furnace Seal/Caulk Around Pipe at Building 90˚ Elbow 12" Min. Normal Snow Level W all Coupling First Support Should be as Close to Furnace Connection as P ossible Combustion Air Intake Pipe Furnace 3" x 2" Reducer Exhaust V ent PVC or ABS pipe Offset with V ent for Adequate Dimensional Clea[...]

18 Horizontal Venting Vent and combustion air intake terminations must be as shown in Figure 19 unless the concentric vent termination kit is used. ! W ARNING: Ensure that the combustion air vent and the exhaust vent are configured as shown in Fig. 19. Improper vent termination can cause recirculation of the flue gases. This may result in furnace v[...]

19 36" max. 12" min. Exhaust V ent Option B Exhaust V ent Option A Exhaust V ent Option C Mounting Kit Faceplate Secured to Wall with Screws 12" Min. 36" Max. 12" Min. 36" Max. 7" Min. 8" Min. 12" Min. to Normal Snow Level Combustion Air Inlet Grade Level or Normal Snow Inlet Exhaust Figure 20. Vertical [...]

20 Figure 21. Furnace with Condensate Drain Trap Assembly A A Clamp Step 1: Loosen Step 2: Rotate to drain direction Step 3: Retighten Keep Downward Slope Alt. Drain Alt. Drain Alt. Drain Alt. Drain Floor Ca vity Floor “Hard ” J Drain T ube Burner Box Collector Box 1. Remove the collector box soft tube at location A in Figure 21 and insure the [...]

21 Figure 22. Typical Gas Piping Table 7. Capacity of Black Iron Gas Pipe (cu. ft. per hour) for Natural Gas (specific gravity = .60) To Gas Supply Floor Inducer Alt. Gas Line Entry Floor Cavity Gas Valve Burner Box Control Board Main Blower N OM IN AL LE N G TH OF PIPE R U N B LA C K IR ON ( f ee t ) PIPE DIAM ETER ( i n . ) 1 0 2 03 04 05 06 07 0[...]

22 Table 8. Approximate Orifice Size for Natural and LP Gases Nat LP Nat LP Nat LP Nat LP Nat LP 060A-A/ B W 60, 000 4 5 0 57 50 57 51 58 51 58 52 59 080A-A/ B W 80,000 5 49 1. 15 mm 49 1.15 mm 50 57 50 57 51 58 Fur na c e Mod el Numbe r M3R L - Fur na c e R a t ing P l ate I n p u t (B tuh) No . o f Bu rn ers E l evat i o n 0 - 2000 Eleva tio n 20[...]

23 Figure 25. T ypical Installation For Sealed Burner Bo x With Access Cover Plate Burner Orifices Gas Manifold Flame Observation Port Gas Valve Access Cover Plate Burner Box Inlet Pressure Ta p Inlet On/Off Lever Figure 24. Burner Inspection Figure 23. Convertible Pressure Regulator Cap Hone ywell V alve PRESSURE REGULATOR CAP M11678 N A T N A T L[...]

24 7. After the flame ignites, visually inspect the burner assembly to ensure that the flame is drawn directly into the center of the heat exchanger tube, as shown in Figure 23. The end of the flame will be out of sight around the bend of the heat exchanger tube. In a properly adjusted burner assem- bly, the flame color should be blue with some lig[...]

25 Field Supplied Disconnect Within Sight of Furnace Field Supplied Panel Connector Field Supplied Fused Service Panel Black (Hot) White (Neutral) Green or Bare (Ground) Black White Black White Black White Field Line Voltage Wiring Factory Line Voltage Wiring Ground Ground Ground Junction Box (may be internal or external to the furnace). These conn[...]

26 Figure 28. Low Voltage Field, Four-wire Heating/Cooling Applications R C Y G W A/C Condensing Unit Condensing Unit Control Box Room Thermostat Flame Signal Light (Yellow) Status Light (Red) 60 90 120 180 Blower Off Timing TWIN 3 Amp Fuse COM 24 V HUM Neutrals Low Voltage Connections 41 52 63 7 8 9 4 5 6 1 2 3 EAC HUM M1 M2 M3 COOL HEAT L1 XFMR U[...]

27 5 . After the furnace has run for approximately five minutes, set the thermostat below room temperature and verify steps 9 - 11 of the SEQUENCE OF OPERATION. Shut Down Procedure In the event that the furnace must be shut down, follow this procedure: 1. Set the room thermostat to "OFF" or its lowest temperature setting. 2 . Turn OFF the[...]

28 TIME FOR TIM E FOR ON E R EV OLU TION ON E R E VOLU TION (S ECONDS ) 1 5 10 (S ECONDS ) 1 5 10 24 150 750 1500 80 45 225 450 26 138 692 1385 82 44 220 439 28 129 643 1286 84 43 214 429 30 120 600 1200 86 42 209 419 32 113 563 1125 88 41 205 409 34 106 529 1059 90 40 200 400 36 100 500 1000 92 39 196 391 38 95 474 947 94 38 191 383 40 90 450 900 [...]

29 Gas Valve – The gas valve controls the flow of gas to the burners. When the gas valve is energized it automatically opens and regulates the gas pressure in the manifold. Pressure Switch – The pressure switch veri- fies that the inducer is drawing the combustion gases through the heat exchanger. It also senses a blocked condensate drain condi[...]

30 ! W ARNING: Never operate the furnace without a filter in place. Dust and lint in the return air can build up on internal compo- nents, resulting in loss of efficiency, equipment damage, and possible fire. Lubrication The bearings in the circulating air blower mo- tors are pre-lubricated and sealed at the fac- tory. No further oiling of the bear[...]

31 Initial Power up: After 30 seconds of igniter warm-up the gas valve (24 VAC) will then open. The igniter circuit will stay ener- gized for 3 seconds after the gas valve opens. After Initial Power up: The control has a programmed adaptive ignition feature which varies the warm-up period as fol- lows: If ignition is successful the warm-up is reduc[...]

32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 21 22 M3 Do wnflow Furnace 1 Door Assembly - Louvered 2 Filter Inside Door 3 Blower Assembly 4 Control Board 5 Pressure Switch 6 Flame Rollout Switch 7 “J” Trap Hard Tube 8 Low Voltage Transformer 9 In Line Drain Assembly 10 Junction Box 1 1 Vent Safety Switch Figure 29. Location of Major Compo[...]

33 Figure 30. Downflow Furnace Wiring Diagram WD #710240B If an y o ft h e ori g ina l wit h th e f u rn ace m us t be re p laced, i t m us t be re p laced wirin g m a t e ri a l h avin g a ratin g of a tl eas t ˚ C. U se co pp e r co n duc t o r s o nl y. IGNITOR INDUCER GAS VALVE SUPPLY AIR LIMIT SWITCH (ALL MODELS) VENT SAFETY SWITCH (ALL MODEL[...]

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35 UNIT MODEL NUMBER ________________ Minimum Clearances per Table 3? ________ Electrical Connections tight? _____________ Line Voltage Polarity correct? ____________ Supply Voltage: ___________________ Volts Blower Motor HP: _____________________ FUEL TYPE: Natural Gas ______ LP/Propane _______ Gas Piping Connections leak-tested? _____ Gas Line Pr[...]

O’Fallon, MO 708219E (Replaces 708219D) Specifications and illustrations subject to change without notice and without incurring obligations. Printed in U.S.A. (08/06) ¢7082197¤ 708219E[...]