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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
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TABLE OF CONTENTS General ...................................................... 4 Conversion .............................................. 21 Unit Dimensions .................................. 4 Lighting and Adjustment Shipping Weights ................................ 4 of the Appliance .............................. 23 Furnace Specification ........................ 4 Electrical Wiring ...................................... 24 Air Flow Data ..................................... 4 Line Voltage
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GENERAL 1-1/2 1-1/2 21-11/32 21-11/32 1 19-7/8 9-7/8 3 3-17/32 -17/32 2 24-5/8 4-5/8 C COMB OMBU USTION STION A AIR IR IINT NTA AKE KE COMB COMBU USTION STION A AIR IR INT INTA AKE KE 1 17-13/16 7-13/16 E EXHA XHAUST UST V VENT ENT 1-11/16 1-11/16 E EXHA XHAUST UST V VENT ENT S SIDE RETURN IDE RETURN SIDE RETURN SIDE RETURN 18-1/2 18-1/2 K KNOCK NOCKO OUTS UTS KNOCK KNOCKO OUTS UTS 1 18-1/2 8-1/2 21-17/32 21-17/32 56-1/16 56-1/16 7/8 Diameter 7/8 Diameter 21-29/32 21-29/32 ( (W/ Coil Bo W/ Coil
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5. Never test for gas leaks with an open flame. Use a commercially available soap ! WARNING: solution made specifically for the detection of leak to check all connections. Do not use this appliance if any part 6. Always install furnace to operate within the has been submerged under water. Im- furnace’s intended temperature rise range mediately call a qualified service tech- with a duct system that has an external nician to inspect the appliance and to static pressure within the allowable range,
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Follow the instructions in this booklet carefully 6. Providing instructional training on how to and this appliance will provide many years of light and operate the furnace. superior performance. 7. Furnace problems caused by installation of an air conditioner, heat pump or other air If you wish to cool your home automatically comfort devices. with a central air conditioning system investi- 8. Revising installation of the furnace flue gate the excellent NORDYNE cooling systems assembly. available
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CE générateur d'air chaud doit être installé bustible material other than wood flooring. The conformément aux instructions du fabricant et furnace may be installed on combustible floor- aux codes locaux. En l'absence de code local, ing when installed on a Nordyne duct connec- respecter la norme ANSI Z223.,1, institulé Na- tor (see Table 5). tional Fuel Gas Code ou les codes d'installation CAN/GCA-B149. The ductwork within 3 feet of the furnaces without the A/C coil box must be installed such T
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in the floor or ceiling shall not be less than 235 RETURN AIR PROVISIONS square inches. U.S.A. home manufacturers shall comply with e. The total free area of openings in the floor or all of the following conditions to have accept- ceiling registers serving the return air duct able return air systems for closet installed system must be at least 352 sq. in. At least forced air heating appliances: one register should be located where it is not a. Regardless of the location, the return air likely t
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REAR WALL ( )OPENING TO DUCT REDUCER (1) WITH PLATE (C) REMOVED OPENING BECOMES 13-1/4” x 13-1/4” 1 FELT-SEAL( ) (2) WITH PLATE (C) REMOVED C OPENING BECOMES 13" X 13". WITH REDUCER IT IS 13" X 10-1/8". SEE X TABLE 5 SPACERS (1) FINGER TAB DUCT CONNECTOR ONLY (2) SCREW DOWN DUCT CONNECTOR ONLY Figure 5. ALT. FUEL LINE HOLES 10" C C L L FLOOR OPENING 23 -1/4" FUEL LINE HOLE Figure 6. Closet or Alcove i. Gas piping is not run in or through the return tain necessary ai
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20 14-1/2 2-3/4 REAR WALL OF CLOSET OR ALCOVE 2-1/4 FLOOR CUT-OUT FOR DUCT CONNECTIONS 17-29/32 14-1/2 21-3/4 24 21-7/16 3-19/32 1-3/4 VENT 23-1/4 COMBUSTION AIR INTAKE FUEL LINE ENTRY 2 10 1-3/4 ˚ 1-1/4 12-7/8 ALT FUEL LINE 14-3/4 FURNACE ENTRY OUTER DOOR 15-1/2 FLOOR CUT-OUT FOR OPTIONAL COOLING COIL FOR NON-PLATINUM SERIES UNITS Figure 7. Cut-Out Locations cavity. To maximize air delivery, re- AIR DISTRIBUTION SYSTEMS move reducer “C” (see Figure 5) to For proper air distribution, the supply
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REAR WALL BEND CONNECTOR TABS UNDER DUCT OPENING MOUNTING PLATE FLOOR OPENING FUEL LINE HOLES SUPPLY AIR DUCT 5-1/4" to the left of center of the floor cut-out, INSTALLING PLATINUM SERIES 14” or for entry through right-side of furnace ROUND DUCT CONNECTOR measured 9" to the right of center of the floor a. Place duct connector through the floor open- cut-out. ing. (See Figure 9). d. Cut out floor opening and one gas line hole. b. Secure duct connector to floor. CUT DUCT OPENING (FINGER TABBED
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nector. Additional screws may be added if attached to the sides of the duct by using sheet required. metal screws or other suitable fasteners. (See e. Cut away along edge of flange allowing the Figure 11). center to drop into the duct. Remove section of duct with caution, as edges will be sharp. If sealant, mastic, or tape is used to provide a better seal, it should be approved by applicable INSTALLING FINGER TABBED DUCT CON- national or local codes. NECTORS a. Place duct connector through the f
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SUPPLY AIR DUCT SUPPLY AIR DUCT Knockout Over Holes NOTE: Additional fasteners may be used at rear, sides or through door frame, as desired, to secure furnace to closet or alcove framing. SLIDE FURNACE MTG. PLATE TABS ALL THE WAY BACK ONTO MTG. PLATE SECURE FURNACE VENTING AND COMBUSTION AIR WITH 2 FASTENERS AT FRONT CORNER HOLES REQUIREMENTS ! CAUTION: Snow must not be allowed to restrict or block the combustion air intake or vent Figure 13. “A”, “B”, & Platinum pipes. Cabinet Furnaces Gen
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that there is no blockage or re- striction, leakage, corrosion and ! CAUTION: other deficiencies which could Do not allow debris to fall into the fur- cause an unsafe condition. nace. This could cause unsafe opera- 3. So far as is practical, close all tion and voids the furnace warranty. building doors and windows and all doors between the space in which the appliance(s) connected VENTING REQUIREMENTS to the venting system are located and other spaces of the building. 4. Follow the lighting ins
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*NOTES 1. Subtract 3.5 ft. for each additional 3" 90 degree elbow. MAXIMUM 2. Two 45 degree elbows are equivalent to one 90 degree elbow. DIRECT VENT, DUAL APPLICATION 3. One short radius elbow is equivalent to two long radius PIPE LENGTH (ft.)* elbows. Inlet/Outlet PVC,CPVC or ABS 4. Do not include termination elbows in calculation of vent length. 5. This table is applicable for elevations from sea level to 4000 SCH. 40 Pipe Size 3" 3" ft. For higher elevations, decrease vent pipe lengths by
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escape through such appliances or vents. Do not vent the furnace to a fireplace chimney or ! CAUTION: building chase. If removing an existing furnace in a venting Combustion air must not be drawn from system, the venting system may not be properly occupied spaces and a corrosive sized. To test the vent system with the remaining atmosphere. appliances, follow the test outlined below. The following steps shall be followed with each The quality of outdoor air must also be appliance connected to
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Downflow Furnace 3 9/16" Vent 1 7/8" Combustion Air Intake Pipe See Vent Table 4 Seal/Caulk Around Pipe Straps or Other Suitable at Building Supports at Minimum of 5 ft. Intervals Top View Coupling 90˚ Elbow Offset with Vent for Adequate Dimensional Clearance Exhaust Upward Pitch - 1/4" Per Foot 12" Vent Wall Outlet Exhaust Vent Min. PVC or ABS pipe First Support Should be as Close to Furnace Connection as Possible 3" x 2" Combustion Air Normal Snow Level Intake Pipe Furnace Reducer Figure 16.
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Horizontal Venting 2. Extend the vent pipe through the wall Vent and combustion air intake terminations approximately 1" and seal the area be- must be as shown in Figure 19 unless the tween the wall and pipe. concentric vent termination kit is used. 3. Apply couplings to the vent pipe on the interior and exterior sides of the wall to insure the pipe can not be pushed or pulled through the wall. ! 4. Insure the combustion air inlet pipe has a 90 WARNING: degree termination elbow, and is pointing
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Vent Configuration to Exhaust Vent Option B Provide 12" Minimum height above Mounting Kit Snow Level. Faceplate Secured Exhaust Vent 12" Min. to Wall with Screws 12" Min. Option A 19" Max. 36" Max. Combustion 8" Min. Air Inlet Support Exhaust Vent Outside Option C 12" Above Wall 12" min. Normally 36" max. Grade Level Expected 12" Min. 36" Max. or Normal Snow Snow 12" Min. to 7" Min. 1/2" Normal Snow Level Level Armaflex Inlet Exhaust Insulation or Equivalent (if required) Figure 18. Alternat
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A Floor Cavity Collector A Box Clamp Step 1: Loosen Step 2: Rotate to drain direction Burner Step 3: Retighten Box Keep “Hard” Downward J Drain Tube Slope Floor Alt. Drain Alt. Drain Alt. Drain Alt. Drain Figure 21. Furnace with Condensate Drain Trap Assembly 1. Remove the collector box soft tube at readily accessible for service and/or emer- location A in Figure 21 and insure the exit gency use. Consult the local utility or gas from the collector box is clear of any supplier for additional requ
