Home

Nordyne M3RL Furnace User Manual

1. L Electronic Air Tap 5A 120 VAC Humidifier Tap 5A 120 VAC SA These motor speed taps are not used for two stage models Figure 27 Blower Speed Tap Location Maximum Fuse or Circuit Amperes Breaker Amps Thermostat Wire Gauge Recommended Thermostat Wire Length 4 or 5 wire cooling Time delay fuses or HACR type circuit breakers are required Table 10 Electrical Data Field Supplied Fused Service Panel Black Hot Field Supplied Panel Connector Ground Ground Z Field Supplied Disconnect Within Sight of Furnace X l Black __ White ms Field Line Voltage Wiring Factory Line Voltage Wiring Ground X Junction Box may be internal or external to the furnace These connections can be made in the field supplied disconnect at the furnace Figure 26 Line Voltage Field Wiring 25 The thermostat must not be installed on an outside wall or any other location where its operation may be adversely affected Adverse affects include radiant loading from fireplaces sunlight or lighting fixtures and convective loading from warm air registers or electrical appliances To check the heat anticipator setting either 1 Add the current draw of the system com ponents or 2 Measure the current flow on the thermostat R W circuit after the circulating blower motor has started Set the heat an
2. k Alt Drain Clamp Step 1 Loosen Step 2 Rotate to drain direction Step 3 Retighten Keep Downward Slope Alt Drain Figure 21 Furnace with Condensate Drain Trap Assembly 1 Remove the collector box soft tube at location A in Figure 21 and insure the exit from the collector box is clear of any debris or obstructions 2 Replace this tube and insure the fit to the header spoutis air tight Air will be drawn into the header if this connection is not tight 3 Check other tube connections along the drain system Insure that all are air tight NOTE Industry research studies indicate that when condensate is routed to an active drain household detergents etc buffer its acidity If the drain is not actively used or if codes require obtain a neutralizer kit 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 GAS SUPPLY AND PIPING General This furnace is equipped for bottom left or right side gas entry Typical gas service hook ups are shown in Figure 22 When making the gas connection provide clearance between the gas supply line and the entry hole in the furnace casing to avoid unwanted noise and or damage to the furnace All gas piping must be installed in compliance with local codes and utility regulations Some local regulat
3. position see Figure 29 Setthe thermostat above room temperature and observe the ignition se quence The flame canbe observed through the small clear window on the burner box The burner flame should carry over between all burners The flames should be blue without yellow tips Flames should extend from each burner without lifting curling or floating After verifying ignition setthe thermostat below room temperature and verify that the burner flame extinguishes completely Replace the front door Verifying Operation of the Supply Air Limit Switch To verify operation of the supply air limit switch make sure that the blower door is in place and that there is power to the furnace 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 28 temperature and verify that the Sequence of Operation is as described in these instructions The supply air limit switch should function to turn off the gas valve within approximately five minutes The circulating air and combustion blowers should continue to run when the supply air limit switch opens Remove the close off plate immediately after the supply air limit switch opens If the furnace operates for more than five minutes with no return air set the thermostat below room temperature shut off the power to the furnace and replace the supply air limit switch DESCRIPTION OF COMPONENT
4. 4 Move the gas valve lever knob to the ON position The lever knob must be moved to the end of its range of motion to insure the valve is completely open Use only your hand to push in or turn the gas control valve Never use tools Honeywell Valve PRESSURE REGULATOR CAP OF CAP Figure 23 Convertible Pressure Regulator Cap Burner Orifices as Manifold _ Observation ae Port Flame Burner Box Figure 25 Typical Installation For Sealed Burner Box With Access Cover Plate 5 Set the room thermostat to a point above room temperature to begin the heating cycle of the unit 6 Check that the unit ignites and operates properly Refer to the installation instruc tions provided with your unit for the normal operating sequence 23 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 Inaproperly adjusted burner assem bly the flame color should be blue with some light yellow streaks near the outer portions of the flame NOTE Until all of the air is bled out of the gas line the hot surface ignitor may notignite the gas Ifthe ignition control locks out turn the thermostat to its lowest setting and wait one minute then turn the thermostat to a point above room temperature and the ign
5. Only Status Light Red Thermostat NOTE The Y terminal on the UTEC control board must be connected to the thermostat for proper cooling mode operation FIELD WIRING Low Voltage Connections Neutrals Unused Motor Leads l INH OVA Figure 28 Low Voltage Field Four wire Heating Cooling Applications 4 The roll out and vent safety manual reset switches are closed If necessary press the red button to reset a switch See Figure 26 for location DO NOT install a jumper wire across a switch to defeat its function If a switch reopens on start up DO NOT reset the switch without identify ing and correcting the fault condition which caused the switch to trip 5 The blower door is in place closing the door switch in the line voltage circuit 6 The gas line has been purged and all connections are leak tight Start Up Procedure 1 Set the thermostat to the lowest setting 2 Close the disconnect s to provide line voltage to the furnace 3 Follow the procedures given on the oper ating instructions label attached to the furnace 4 Set the thermostat above room tempera ture and verify the sequence of operation See the SEQUENCE OF OPERATION 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 OPERATI
6. STEP 2 Fold Back Flap B Fold Back Flap B Staple Folded Duct Flap typ to side of Duct Connector Figure 12 Alternate Installation 12 SLIDE FURNACE ALL THE WAY BACK ONTO MTG PLATE MTG PLATE TABS PR Re 2 42 SECURE FURNACE Wa WITH 2 FASTENERS AT FRONT a ae HOLES rr ay PE SSS SUPPLY AIR DUCT Figure 13 A B amp Platinum Cabinet Furnaces SLIDE FURNACE ALL THE WAY BACK ONTO MTG PLATE E Figure 14 A Cabinet Furnace on 911969 Coil Cabinet Non Platinum Series 3 At the front to back of duct run Area A bend the duct tabs and secure them directly to the duct 4 At Area B bend the duct tabs up and back over around the duct connector See Step 3 5 Fold form the duct flap against the side of the duct connector and attach as shown See Step 4 Use three 3 staples minimum on each duct flap OR if a 2X block joist is not provided use two 2 sheet metal screws minimum on each duct flap An alternate attachment method is acceptable as long as the plenum is securely attached 6 Tape the duct flap edges with an approved tape for a leak free joint INSTALL FURNACE a Remove furnace outer door s and bottom fuel line knockout b Place furnace onto duct connector and cen ter with floor opening c Slide onto mounting plate Bottom rear slots on furnace should engage with mounting plate
7. To Turn Off the Fuel Supply to the Appliance 2 Disconnect the flame sensor wire from the burner box 3 Disconnect the ignitor wires at the 2 pin plug This is a locking quick connect and both sides of the lower section must be depressed in order to be separated 4 Remove the wires from the terminals of the gas valve 5 Disconnect the rubber pressure tubes from the gas valve and the burner box 6 Remove the burner access cover plate from the burner box 7 Remove supply gas piping from the gas valve 8 Carefully remove the burner assembly fas teners and remove the burner assembly from the appliance Keep the fasteners that were removed Note that the burner box may have hooks near the top and on the right and left hand sides To remove this type of burner box lift the burner box upwards and then remove the box from the unit To Remove the Burner Orifices 1 Remove the four 4 fasteners that secure the gas manifold to the burner box as shown in Figure 25 Carefully remove the gas manifold assembly from the burner box Note that the gas manifold assembly consists of the gas valve the gas manifold and the orifices 2 Carefully remove the burner orifices from the gas manifold as shown in Figure 25 CAUTION Caution Do not re drill the burner orifices If the orifice size must be changed use only new orifices Note The size of the new orifices that will be installed into the unit will depe
8. Carefully review these responsibilities with your manufactured housing dealer service company or gas supplier so there will be no misunder standing at a later time CAUTION Never attempt to alter or modify this furnace or any of its components e Never attempt to repair damaged or inoperable components Such action could cause unsafe operation ex plosion fire and or asphyxiation If a malfunction has occurred or if you feel that the furnace is not oper ating as it should contact a qualified service agency or gas utility for as sistance INSTALLATION STANDARDS Installer shall be familiar with and comply with all codes and regulations applicable to the installa tion of these heating appliances and related equipment In lieu of local codes the installation shall be in accordance with the current provi sions of one or more of the following standards a Federal Manufactured Home Constructions amp Safety Standard H U D Title 24 Part 3280 707 a 2 The Standard for Manufactured Home Instal lations Manufactured Home Sites Commu nities and Set Ups ANSI A225 1 and or CAN CSA 2240 MH Series American National Standard ANSI 119 2 NFPA 501C for all recreational vehicle in stallations d American National Standard ANSI Z223 1 NFPA 54 and or CAN CGA B149 for all gas fired furnace models e American National Standard ANSI C1 NFPA 70 and or CSA 22 1 Canadian Electric Code Part 1 fo
9. FT 1 7 8 Combustion Air Intake Pipe Seal Caulk See Vent Table 4 Around Pipe at Building Straps or Other Suitable Supports at Minimum of SN 5 ft Intervals 90 Elbow Non y Offset with Vent for Adequate Dimensional Clearance Upward Pitch 1 4 Per Foot Exhaust lt Wall Outlet Exhaust Vent Vent PVC or First Support Should be as Close to __ ABS pipe Furnace Connection as Possible _ Combustion Air ly 3 x 2 Normal Snow Level Intake Pipe Furnace Reducer Figure 16 Horizontal Venting Support System on Vertical Rise Below Joints 4 a First support should be as close to furnace as possible Combustion Air Intake Pipe Upward Pitch 1 4 per foot Figure 17 Vertical Venting 5 Avoid areas where condensate drainage 6 Select the point of wall penetration where may cause problems by dropping on plant the minimum 1 4 inch per foot of slope up ers or patios etc Also ensure that ex can be maintained haust gases will not impinge on windows or building surfaces which may be com promised or damaged by condensation A Do not install the vent terminal such that CAUTION 5 exhaust is directed into window wells 3 stairwells under decks or into alcoves or For optimal performance vent sos similar recessed areas and do not termi throughwal
10. for 50 000 Btuh 15 kW 12 inches 30 cm for appliances gt 100 00 Btuh 30 kW appliances gt 50 000 Btuh 15 kW Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet 61 cm from the center line of the terminal CR a O EE RE EE EE x x Clearance to unventilated soffit id Clearance to inside comer o o o o o ooo gt o S O 3 feet 91 cm within a height 15 feet extended above meter regulator assembl above the meter regulator assembl 3 feet 1 83 m Clearance to nonmechanical air supply inlet 6 inches 15 cm for appliances lt 10 000 6 inches 15 cm for appliances lt 10 000 to building or the combustion air inlet to any Btuh 3 kW 12 inches 30 cm for Btuh 3 kW 9 inches 23 cm for other appliance appliances gt 10 000 Btuh 3 kW and lt appliances gt 10 000 Btuh 3 KW and lt 100 00 Btuh 30 kW 36 inches 91 cm for 50 000 Btuh 15 kW 12 inches 30 cm for appliances gt 100 00 Btuh 30 kW appliances gt 50 000 Btuh 15 kW Clearance to a mechanical air supply inlet 6 feet 1 83 m 3 feet 91 cm above if within 10 feet 3 m horizontally Clearance above paved sidewalk or paved 7 feet 2 13 m 4 driveway located on public property Clearance under veranda porch deck or 12 inches 30 cm gt balcon In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code In accordance with the
11. CLOSET OR ALCOVE FLOOR CUT OUT FOR DUCT CONNECTIONS FURNACE OUTLINE pf 3 19 32 b t 1 3 4 d N VENT t COMBUSTION AIR INTAKE FUEL LINE ENTRY ss 2 1 1 4 77 ALT FUEL LINE es 1 3 4 FURNACE ENTRY s OUTER DOOR FLOOR CUT OUT FOR OPTIONAL COOLING COIL FOR NON PLATINUM SERIES UNITS Figure 7 Cut Out Locations AIR DISTRIBUTION SYSTEMS For proper air distribution the supply duct system must be designed so that the static pressure measured external to the furnace does not exceed the listed static pressure rating shown on the furnace rating plate Three typical distribution systems are illus trated in Figure 2 Location size and number of registers should be selected on the basis of best air distribution and floor plan of the home DUCT CONNECTORSELECTION PLATINUM SERIES a For Platinum ready construction use the 14 round plenum p n 903896 NON PLATINUM SERIES a Determine depth of floor cavity from surface of floor to top of supply air duct See Figure 3 b Select appropriate model from Table 5 which matches X dimension of the floor 10 cavity To maximize air delivery re move reducer C see Figure 5 to obtain the largest open area that will fit the duct floor construction DUCTINSTALLATION Required floor ceiling and roof cut out open ings must b
12. F Return Air Temperature F Temperature Rise F STATE STATE UNIT SERIAL NUMBER Are Flue Connections tight Is there Proper Draft Is Vent free from restrictions Is the Filter s secured in place Is the Filter s clean Has the Thermostat been calibrated Is the Thermostat level Is the Heat Anticipator Setting correct Has the Owner s Information been reviewed with the home owner Has the Literature Package been left near the furnace 35 3 EFFICIENCY RATING CERTIFIED ENERGY STAR 708219E 708219E Replaces 708219D Specifications and illustrations subject to change without notice and withoutincurring obligations Printedin oration Mo NORDYNE U S A 08 06
13. 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 blowers are operating and items 1 through 8 have been checked press the red reset but ton on the vent safety switch See Figure 29 If the furnace operates after depressing the reset button contact a qualified service tech nician to identify and repair the problem If furnace still fails to operate depress the red reset buttons on the flame roll out switch If the furnace operates after depressing the reset button contact a qualified service tech nician to identify and repair the problem 31 M3 Downflow Furnace ih TN j LA KAY nr AI a 5 2 1 Door Assembly Louvered 12 2 Filter Inside Door 13 3 Blower Assembly 14 4 Control Board 15 5 Pressure Switch 16 6 Flame Rollout Switch 17 7 J Trap Hard Tube 18 8 Low Voltage Transformer 19 9 In Line Drain Assembly 20 10 Junction Box 21 11 Vent Safety Switch 22 DO bO d Ignitor Assembly Burner View Port Main Limit Switch Coil Cabinet Assembly Optional Flame Sensor On Burner Box Gas Valve Switch On Off Blower Inducer Orifice In Burner Box Aux Limit Burner Box 32 Figure 29 Location of Major Components Ss BLUE Ss BLUE SUPPLY AIR FLAME ROLL OUT LIMIT SWITCH SWITCH ALL MODELS ALL MODELS VEN
14. Typical Gas Piping If the test pressure is less than or equal to 1 2 psig 14 in water column the furnace must be isolated from the gas supply line by closing the manual shut off valve Leak Check After the gas piping to the furnace is complete all connections must be tested for gas leaks To check for leaks use only a soap and water solu tion or other approved method High Altitude Derate The nameplate input rating for the furnaces apply for elevations up to 4 000 feet above sea level for US and Canada If the elevation for the furnace location is higher than 4 000 feet above sea level the furnace input must be derated by using the appropriate orifice size listed in Table 8 NOTE The density of air decreases with in creasing elevation above sea level This re duces the quantity of combustion air drawn into the furnace under normal operation and requires the unit be derated by using smaller gas orifices or lower manifold pressure CONVERSION This furnace can be converted from the fac tory equipped gas to either natural gas for LP gas ready models or LP gas for natural gas ready models Conversions must be made by qualified service personnel using only factory authorized or approved parts The required conversion orifices are supplied with the fur nace A WARNING DO NOT REMOVE OR DEFACE THE ORIGINAL RATING PLATE CAUTION The gas supply shall be shut off prior to disconnecting the e
15. Wall with Screws Combustion Air Inlet Exhaust Vent Option C 12 Min to Normal Snow Level Figure 19 Exhaust and Combustion Air Pipe Clearances CAUTION Do not install additional traps in the condensate drain The condensate drain may exit through the left side panel the right side panel or through the left or right hole onthe bottom panel See Figure 21 Ensure that the flexible drain hose is not kinked 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 5 Min A 12 Above Roof or Be Me Snow Accumulation Level Elbow Combustion Air Intake 1 10 Min Figure 20 a Exhaust Note If terminations meet Vent ing these vertical require ments exceed the maximum height for safe transit the vent and combustion air in takes may be shipped with the home for assembly on site The furnace must be labeled to notify the installer user not to use the furnace until the vent and combus tion air intake terminations are installed Exhaust Plumbing Vent Roof Boot Typ Both Pipes Vertical Vent Termination 19 Collector Box Burner Box J Drain Tube Alt Drain V Alt Drain
16. any part has been submerged under water Im mediately calla 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 warnings in this manual to insure maximum performance safety and operating efficiency of these appliances Improper installa tion may create hazardous conditions and will void the appliance warranty GENERAL General Description The M3 series gas furnaces are listed direct vent sealed combustion forced air furnaces for use with both natural and propane gases The M3 series is a Category IV and type FSP furnace The M3 furnace series has been certified to the ANSI Z21 47 CSA2 3 2001 for use in the United States and Canada and to the UL307B 1995 for use in the United States These furnaces may be installed in 1 Manufactured Homes 2 Park Models and Manufactured buildings 3 Modular Homes Buildings The following are safety guidelines with refer ences to their specific sections or pages in the manual 1 Use only type of gas approved for this furnace Refer to the furnace rating plate 2 Install this furnace only in location and position as specified in pages 7 13 of these instructions 3 Provide adequate combustion and ventila tion air to the furnace space as specified in pages 13 20 of these instructio
17. current ANSI Z223 1 NFPA 54 National Fuel Gas Code A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor For clearances not specified in ANSI Z223 1 NFPA 54 or CSA B149 1 the following statement shall be included Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer s installation instructions Figure 15 Vent Termination Clearances for Direct Vent Furnaces 15 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 notbe properly sized To test the ventsystem with the remaining appliances follow the test outlined below The following steps shall be followed with each appliance connected to the venting system placed in operation while any other appliances connected to the venting system are not in operation Vent Pipe Material Vent and combustion air pipe and fittings must be one of the following materials and must conform to the indicated ANSI ASTM standards Material Standard Schedule 40 PVC D1785 PVC DWV D2665 SDR 21 D2241 amp SDR 26 ABS DWV D2661 Schedule 40 ABS F628 Foam Cellular Core PVC F891 Cemen
18. during the heating season New or newly renovated homes may require more frequent changing until the con struction dust has been removed 29 WARNING Never operate the furnace without a filter in place Dustand lintin 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 bearings is required for the life of the motor Condensate Drain Assembly Be sure the condensate lines are free and open i e avoid kinking hoses Also make sure all hose clamps are tight to avoid drawing air into the system Blower Compartment The blower compartment should be cleaned monthly during the heating and cooling sea sons to remove any dirt and lint that may have accumulated in the compartment or on the blower and motor Dirt and lint can create excessive loads on the motor resulting in higher than normal operating temperatures and short ened service life Heat Exchanger and Burner Maintenance The furnace should operate for many years without excessive soot buildup in the flue pas sageways however the flue passageways the vent system and the burners should be inspected and cleaned if required by a quali fied service technician annually to ensure con tinued safe operation Particular attention must be given to identify
19. furnace is equipped with a multispeed motor Heating and cooling speed selection is made by moving the leads on the integrated control board located in the furnace The wiring diagram on the furnace and Figure 30 show the speed taps for adjusting motor speed If itis desired that the blower operate at the same speed for heating and cooling tape off the terminal of the unused blower wire Install the jumper wire found in the plastic instruction bag across the HEAT and COOL taps on the control board Reconnect the desired blower tap to the piggyback quick connect The blower control is designed to start the circulating air blower 30 seconds after the gas valve is opened The blower control is factory wired to turn the blower motor off 120 seconds 27 GAS FLOW RATE CUBIC FEET PER HOUR CUBIC FEET PER REVOLUTION OF METER TIME FOR ONE REVOLUTION SECONDS TIME FOR CUBIC FEET PER REVOLUTION OF ONE REVOLUTION METER 5 10 225 450 220 439 214 429 209 419 205 409 200 400 196 391 191 383 188 375 184 367 180 360 176 353 173 346 170 340 167 333 164 327 161 321 158 316 155 310 153 305 150 300 Table 11 Gas Flow Rate after the gas valve is closed This timing can be changed using the BLOWER OFF timing switch opposite the terminal block on the control board See Figure 27 Verifying Burner Operation To verify operation of the burners remove front door and ensure thatthe door switch is inthe on
20. grounding must be done in accor dance with the current Canadian Electrical Code CSA C22 1 Part 1 and or local codes If any of the original wire as supplied with the furnace must be replaced it must be replaced with wire having a minimum temperature rating of 105 C Refer to the furnace nameplate and Table 8 for electrical requirements Line Voltage Wiring The line voltage 115 volt to the furnace must be supplied from a dedicated branch circuit containing the correct fuse or circuit breaker for the furnace See Table 10 An electrical switch should be readily accessible from and within sight of the furnace See the Wiring Diagram label in the furnace for more details The furnace cabinet must have an uninter rupted unbroken ground to minimize injury should an electrical fault condition occur The controls used in this furnace require an earth ground to operate properly Acceptable meth ods for grounding are electrical wire or conduit approved for electrical ground service Do not use gas piping as an electrical ground NOTE Proper line voltage polarity must be maintained in order for the control system to operate correctly Verify that the incoming neu tral line is connected to the white wire and the incoming 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 discon
21. level e The outlet of the vent must be extended at least 10 inches above the inlet of the combustion air intake pipe e The vent as well as the combustion air intake pipe should be located on the same side of the roof Both pipes must not be closer than 5 inches apart They should not be separated more than 36 inches The roof penetration must be properly flashed and waterproofed with a plumbing roof boot or equivalent flashing Termination spacing re quirements from the roof and from each other must be per Figure 20 Concentric Vent Termination A concentric vent termination is approved for use with these furnaces See Table 12 For proper installation of the concentric vent termi nation follow the installation instructions pro vided with the kit Vent Configuration to Provide 12 Minimum height above Snow Level 7 Outside _ Wall Ib a es 12 Above Normally Expected Snow ii Level 1 Armaflex j Insulation or A Equivalent Y if required Figure 18 Alternate Horizontal Vent Installation DRAINAGE OF CONDENSATE FROM FURNACE A WARNING The condensate produced bythe furnace must be drained Do not connect a water supply to the drainage hose of the furnace NOTE The condensate drain should be pro tected from freezing when in unheated spaces The furnace is supplied with an internal conden sate drain trap Exhaust Vent Option B Mounting Kit Faceplate Secured to
22. per cubic foot e Firing rate 1000 x 60 60 000 Btuh 6 See the High Altitude Derate section for additional information on firing rate at eleva tions above 4 000 ft The gas valve regulator is set at a nominal value of 3 5 in water column for use with natural gas The manifold pressure mustbe set at 10 0in water column for use with LP gas Verifying and Adjusting Temperature Rise Verify that the temperature rise through the furnace is within the range specified on the fur nace rating plate Temperature rises outside the specified range could result in premature heat exchanger failure Place thermometers in the return and supply air stream as close to the furnace as possible The thermometer on the supply air side must be shielded from direct radiation from the heat exchanger to avoid false readings Adjust all registers and duct dampers to the desired position and run the furnace for fifteen minutes before taking any temperature readings The temperature rise is the difference between the supply and return air temperatures For typical duct systems the temperature rise will fall within the range specified on the rating plate with the blower speed at the factory recommended setting If the temperature rise measured is outside the range specified it may be necessary to change the blower speed Lower blower speeds will increase the tem perature rise and higher blower speeds will decrease the temperature rise The
23. AKE EXHAUST VENT 1 1116 ns SIDE RETURN KNOCKOUTS a 21 17 32 q TH SIDE RETURN KNOCKOUTS 7a 18 1 2 Va 7 8 Diameter 21 29 32 W O Coll Box 20 9 32 21 15 16 3 17 32 1 19 32 5 L 1 19 82 i 41116 1 be ye pe Cooling Coil Box 20 116 Figure 1 Furnace Dimensions Top Return Knockouts V2 Aa 8 12000 Q a FP Furnace Model Ib S M3RL 060A AW 150 U May include suffix T Top View Top Return Opening pes AW and BW Models BWT Models Table 2 Shipping Weight Furnace Specifications Airflow Data Furnace Furnace Temp External Static Pressure Inches Water Column Recommended Furnace Input Output Rise Motor Motor 01 0 2 03 04 05 AIC Model No Btuh Btuh 3 WC F HP Speed Ton 1660 1599 1544 1474 1410 4 Med High 1512 1467 1416 1363 1304 3 M3 RL 060 60 000 54 000 35 65 1 2 1 2 2 1 2 Lows 1176 1142 1108 1025 966 2 4 3 2 1 2 M3 RL 080 80 000 72 000 35 65 Low 1176 1142 1108 1025 966 2 Note Data is for Operation with Filter Factory Wired Cooling Tap Factory Wired Heating Tap Table 3 Furnace Specifications Airflow Data KK A WARNING Do not use this appliance if
24. 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 e Do not try to light any appliance e Do not touch any electrical switch do not use any phone in your building e Leave the building immediately e Immediately call your gas supplier from aneighbor s phone Follow the gas supplier s instructions e 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 s curit pourrait entrainer des blessures graves la mort ou des dommages mat riels 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 e Ne pas tenter d allumer aucun appareil eNe toucher aucun interrupteur lectrique n utiliser a
25. ECTOR a Place duct connector through the floor open ing See Figure 9 b Secure duct connector to floor INSTALLING SCREW DOWN DUCT CON NECTOR a Apply a bead of caulking mastic or other approved sealant around bottom side of 1 2 flange and restrictor plate when applicable b Locate the duct connector over duct and carefully lower screw down duct connector into place c Once duct connector is located on duct temporarily hold in place while fastening duct connector to the floor using flat head screws or nails Be sure flanges of duct connector stay in contact with the duct d Screw plenum to duct making sure a seal is made between the duct and the duct con Figure 8 Mounting Plate BEND CONNECTOR TABS UNDER DUCT OPENING Lo Lan PL FLOOR OPENING FUEL LINE HOLES Finger Tabbed Screw Down Duct Connectors Duct Connectors Platinum Series SCREWS SCREWS MOUNTING PLATE PLENUM FC 14 SUPPLY CONNECTION Figure 9 Duct Connector 11 nector Additional screws may be added if required Cut away along edge of flange allowing the center to drop into the duct Remove section of duct with caution as edges will be sharp INSTALLING FINGER TABBED DUCT CON NECTORS a Place duct connector through the floor open ing with bottom tabs extending through the duct opening See Figure 9 b Secure duct connector to floor c Bend bottom
26. Installa tion of Air Conditioning and Ventilating Systems NFPA No 90A or the Standard for the Instal lation of Warm Air Heating and Air Conditioning Systems NFPA No 90B RETURN AIR PROVISIONS in the floor or ceiling shall not be less than 235 square inches e The total free area of openings in the floor or ceiling registers serving the return air duct system must be at least 352 sq in At least one register should be located where it is not likely to be covered by carpeting boxes and other objects f Materials located in the return duct system must have a flame spread classification of 200 or less This includes a closet door if the furnace is in a closet g Noncombustible pans having 1 upturned flanges are located beneath openings in a floor duct system h Wiring materials located in the return duct system shall conform to Articles 300 22 of the National Electrical Code ANSI C1 NFPA 70 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 heating appliances a Regardless of the location the return air opening into the closet shall not be less than specified in the appliance s listing b Means shall be provided to prevent inadvert ent closure by a flat object placed over the return air opening when it is located in the floor of the closet versus the vertical front or side wall c Closet installations must us
27. Note For 1 clearance use a fully louvered door with at least 400 square inches of free airflow area 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 from combustible materials When installed in a residential garage the fur nace must be positioned so the burners and the source of the ignition are located no less than 18 inches above the floor and protected from physical damage by vehicles CIRCULATING AIR SUPPLY WARNING Products of combustion must not be allowed to enter the return air openings of the furnace or the circulating air supply Failure to prevent products of combustion from being circulated into the living space can create potentially hazardous conditions including carbon monoxide poisoning that could result in personal injury or death The floor or platform on which the furnace is mounted must provide sound physical support of the furnace with no gaps cracks or sagging between the furnace and the floor or platform The circulating air ductwork must not be connected to any other heat producing device such as a fireplace insert stove etc GENERAL Plenums and air ducts must be installed in accordance with the Standard for the
28. ON 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 main gas supply to the appli ance at the manual valve outside of the appliance casing 3 Remove the control access panel lou vered door 4 Move the appliance gas valve lever knob to the OFF position 5 Turn OFF the electrical power to the appliance Verifying Firing Rate The firing rate must be verified for each instal lation to prevent over firing the furnace NOTE The firing rate must not exceed the rate shown on the furnace rating plate At altitudes above 4000 ft it must not exceed that on the rating plate less 4 for each 1000 ft Use the following procedure to determine the firing rate 1 Shut off all other gas fired appliances 2 Start the furnace and allow it to run for at least three minutes 3 Measure the time in seconds required for the gas meter to complete one revolution 4 Convert the time per revolution to cubic feet of gas per hour using Table 11 5 Multiply the gas flow rate in cubic feet per hour by the heating value of the gas in Btu per cubic foot to obtain the firing rate in Btuh Example e Time for 1 revolution of a gas meter with a 1 cubic foot dial 60 seconds e From Table 11 read 60 cubic feet per hour of gas e Heating value of the gas obtained from gas supplier 1000 Btu
29. S Figure 29 shows the location of each of the functional components described below If any component of the furnace must be replaced use only factory authorized replacement parts Contact your distributor for the approved re placement parts Flame Sensor The flame sensor acts to prove that flame has carried over from the ignitor to the opposite end burner If no flame is sensed the furnace will be shut down automati cally FURNACE ACCESSORY KITS Kit Order Numter Soffit VentilAire Kit 917201 Concentric Vent Termination Kit 903578 for horizontal and vertical venting Horizontal Exterior Vent Mounting Kit 3 PVC 902375 Neutralizer Kit All Models 902377 Table 12 Accessory Kits 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 Italso senses a blocked condensate drain condition Deck Limit Switch Auxiliary Limit The deck limit protects the furnace filter tempera ture from overheating when the motor has malfunctioned If the deck switch opens the power for the furnace will shut down see Figure 29 Supply Air Limit Switch The supply air limit switch prevents the air temperature leaving the furnace from exceeding the maximum outlet air temperat
30. T SAFETY PRESSURE SWITCH SWITCH ALL MODELS WHITE NEUTRAL BLACK 120V ON OFF SWITCH ROOM THERMOSTAT BLOWER DECK SWITCH TRANSFORMER WHITE W BLK STRIPES AIR CONDITIONER CONDENSING UNIT 1 O snivis Mvi FLAME SENSOR _ 3 OR 4 SPEED MOTOR RED Field Wiring Factory Wiring Low Voltage High Voltage If any of the original wire as supplied with the f 6 Factory Wired rn m Limit Circuit Open or External Load On W 1 FLASH C MAC MUS 9e Heating Speeds Does not apply to Deck Switch see below replaced it must be replaced with wiring Furnace material having a Input Btuh temperature rating of at least 105 C FAULT CONDITION Use copper 80 000 Blue FLAME veliow conductors FAULT CONDITION LIGHT only Low Flame Sensor Signal Continuous Flash Flame Present ON WD 710240B Figure 30 Downflow Furnace Wiring Diagram 33 34 INSTALLATION PERFORMANCE CHECK LIST LOCATION INSTALLER CITY CITY 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 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 Btuh Supply Air Temperature
31. actured home industry since the first manufactured home or trailer was built NORDYNE originated the sealed combustion system which separates the furnace com bustion system from the living area of the home now a standard for the manufactured home industry NORDYNE engineers developed the first cen tral heating system and the first central air conditioner for manufactured homes NORDYNE is dedicated to bringing to its cus tomers the finest heating and cooling comfort possible NORDYNE constantly seeks to fur ther refine its products to continuously provide exceptional comfort 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 with your NORDYNE furnace and have been carefully engineered to deliver optimum performance when mated with NORDYNE manufactured home furnaces NORDYNE also offers water heaters fireplaces and ventilating systems specifically designed for manufactured housing applications Check with your manufactured home retailer your heating and cooling contractor or your distributor for information Write directly to the factory PO Box 8809 O Fallon MO 63366 if you are not able to locate a source for NORDYNE manufactu
32. and Adjusting Firing Rate 27 Temperature Rise 27 Verifying and Adjusting Verifying Burner Operation 28 Verifying Operation of the Supply Air Limit Switch 28 Description of Components 29 Furnace Accessories 29 Maintenance 29 Combustion Air and Vent System 29 Air Filter s eseese 29 Lubrication seceresisrsrrniosnsserisisnaninsnnanssn 30 Condensate Drain Assembly 30 Blower Compartment 0000 30 Heat Exchanger and Burner Maintenance cceccccceceeeeeeeeees 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 M3RL 060A AW __ Application oOo M Manufactured Home Furnace Series Comfort Model RL Condensing Downflow Heating Capacity L Return Air Configuration Blank Front T Top 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 Input BTUH 000 Table 1 Model Identification GENERAL 1 1 2 _ 21 11 32 COMBUSTION AIR INTAKE 3 17 32 17 13 16 _ COMBUSTION AIR INT
33. bution Systems 9 Duct Connector Selection 10 Duct Installation 10 Venting and Combustion Air Requirements 13 Venting Requirements 14 Vent Table cc ceeceeceeeeeeeeeees 15 Vent Pipe Material 16 Vent Pipe Length and Diameter 16 Vent Pipe Installation 0 00 16 Pipe Routing amp Support 00 16 Location of Outdoor Termination 16 Horizontal Venting 18 Vertical Venting cceeeeeeeeeees 18 Vent Freezing Protection 19 Concentric Vent Termination 19 Drainage of Condensate From Furnace 19 Gas Supply and Piping 20 Leak Check 21 High Altitude Derate ee 21 Pressure Switch cccceeceeeseseees 21 Conversion 21 Lighting and Adjustment of the Appliance 23 Electrical Wiring 24 Line Voltage Wiring cceeeeeee 24 Low Voltage Wiring eeeeeeeeee 26 Ventilation 26 Start up and Adjustment 26 Start Up Procedure 26 Shut Down Procedure 0 0008 27 Verifying
34. deterioration from corrosion or other sources SYSTEM OPERATION INFORMATION GENERAL Proper maintenance is most important to achieve the best performance from a furnace 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 30 e Do not store gasoline or any other flammable vapors and liquids in the vicinity of the furnace e Change or replace the air filters monthly during any period when the circulating blower is operating regularly e Always replace the doors on the furnace after servicing Do not operate the furnace without all doors and covers in place e Avoid operating the furnace when windows and doors are open Be sure that the thermostat is properly installed and is not being affected by drafts or heat from lamps or other appliances Sequence of Operation Operating sequences for the heating cooling and fan modes are described below Refer to the wiring diagrams Figures 30 and the low voltage field wiring diagram Figure 26 for more details Heating Mode 1 Ona call for heat the thermostat closes applying 24 VAC to the W terminal on the control board 2 The control board checks for continuity on the 24 VAC limit control circuit over temperature limit switch flame rollout switches and blocked vent switch in se ries If an open limit is detected the con trol board will energize the
35. e 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 in free area with the open ings in closet door directly inline with the louvered openings in the furnace door For I lt 19 1 clearance from furnace use a fully lou vered door with at least 400 sq in of free airflow area Top View d The cross sectional area of the return duct of Duct system leading into the closet when located 2 Connector A Single trunk duct NI pri If X Floor Cavity is Model Part Number English Metric mm Finger Tab Screw Down O Figure 2 Non Platinum Supply Duct System Table 5 Duct Connectors A Dual trunk duct a w crossover connector Transition duct w branches FLOOR CAVITY a depth equal to X in Figure 5 and Table 5 SUPPLY AIR DUCT Baa Figure 3 REDUCER FELT SEAL OPENING TO DUCT 1 WITH PLATE C REMOVED OPENING BECOMES 13 1 4 x 1 1 4 2 WITH PLATE C REMOVED OPENING BECOMES 13 X 13 WITH REDUCER IT IS 13 X 10 1 8 SEE X TABLES 1 FINGER TAB DUCT CONNECTOR ONLY 2 SCREW DOWN DUCT CONNECTOR ONLY ALT FUEL LINE HOLES Tr FUEL nee HOLE FLOOR OPENING 23 1 4 Figure 6 Closet or Alcove i Gas p
36. e carefully located to avoid mis alignment of the furnace see Figures 6 amp 7 Installation procedures are suggested for typi cal furnace installations and need not be fol lowed in the exact listed sequence CUT OUT FLOOR OPENING amp FUEL LINE HOLE a Determine center of closet or alcove Fig ures 7 amp 8 b Locate center of the floor opening mea sured 10 from the rear wall and mark cut out measuring approximately 14 1 2 by 14 1 2 1 for model duct connector used refer to Figures 4 amp 5 c Locate center of gas line hole measured 23 1 4 from the rear wall and 6 5 8 to the left of center of the floor cut out See Figure 6 or 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 Place duct connector through the floor open ing with bottom tabs resting on top of the supply air duct b Center duct connector and push back against rear edge of floor opening c Mark cut out location tab area and remove duct connector d Cut out duct opening 1 16 larger than area marked INSTALL FURNACE MOUNTING PLATE a Place mounting plate supplied within duct connector at rear of the floor opening See Figure 9 MOUNTING PLATE FLOOR REAR WALL INSTALLING PLATINUM SERIES 14 ROUND DUCT CONN
37. e local codes to provide sufficient combustion air for the furnace 13 CAUTION Do not allow debris to fall into the fur nace This could cause unsafe opera tion and voids the furnace warranty VENTING REQUIREMENTS A WARNING 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 section applies to the maximum equivalent lengths of vent and combustion air intake pipe These condensing furnaces are classified as Category IV appliances which require special venting materials and installation procedures Category IV appliances operate with positive vent pressure and therefore require vent systems which are thoroughly sealed They also produce combustion condensate which is slightly acidic and can cause severe corrosion of ordinary venting materials Furnace operation can be adversely affected by restrictive vent and combustion air piping Therefore vent and combustion air piping lengths must conform completely to the requirements of Table 6 The furnace must be vented to the outdoors A WARNING CARBON MONOXIDE POISONING HAZARD 1 Seal any unused openings in the venting system 2 Inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code ANSI Z223 1 or the CAN CGA B149 Installation Codes and these instructions Det
38. er is de energized immediately The circulating air blower continues to operate for the speci fied delay factory set at 120 seconds Cooling Mode 1 Onacall for cooling the thermostat closes applying 24 VAC to the G and Y terminals on the furnace control This closes the compressor contactor 2 The furnace control energizes the circu lating blower 115 VAC on the cooling speed 3 When the thermostat is satisfied the G and Y terminals on the control board are de energized opening the compressor contactor 4 The circulating air blower is de energized after a 90 second delay Fan Mode 1 Onacall for fan operation the thermostat applies 24 VAC to the G terminal on the furnace control board 2 The circulating air blower is energized immediately on the heating speed 3 Ifthe furnace is operated in the continu ous ON position at the thermostat and is then switched to AUTO the circulating blower will operate for a specified delay factory set at 120 seconds Furnace Fails to Operate If the furnace does not operate check the following Is the thermostat operating properly Is the front door in place Is the furnace disconnect closed Has the circuit breaker tripped or the control board fuse burned open Is the gas turned on Are any manual reset switches open Is the filter dirty or plugged Is the flame sensor coated Remove and clean with emery cloth 9 Is the deck switch open Pon oo SO gn
39. ermine 14 that there is no blockage or re striction leakage corrosion and other deficiencies which could cause an unsafe condition 3 So far as is practical close all building doors and windows and all doors between the space in which the appliance s connected to the venting system are located and other spaces of the building 4 Follow the lighting instructions Place the appliance being inspected in operation Adjust thermostat so appliance shall operate continuously 5 Turn on clothes dryers and any other appliance not connected to the venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so they shall operate at maximum speed Do not operate a summer exhaust fan 6 Close fireplace dampers 7 Test for spillage from draft hood equipped appliance at the draft hood relief opening after 5 minutes of main burner operation Use the flame of a match or candle 8 If improper venting is observed during any of the above tests the venting system must be corrected in accordance with the National Fuel Gas Code ANSI Z223 1 NFPA 54and or CSA B149 1 Natural Gas and Propane Installation Codes 9 After it has been determined that each appliance connected to the venting system properly vents when tested as outlined above return doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous conditions of use It must not be vented in common with any
40. hese condensing furnaces have been certified for installation with zero clearance between vent piping and combustible surfaces However it is good practice to allow space for convenience in installation and service Location of Outdoor Terminations Vent and combustion air intake terminations must be located to ensure proper furnace operation and to conform to applicable codes Figure 15 illustrates necessary distances from the vent termination to windows and building air intakes In Canada the Canadian Fuel Gas Code takes precedence over these instructions Specifically all minimum distance requirements with respect to termination of the vent piping listed below The following list is a summary of vent terminal location requirements The termination must be 12 inches above snow level or grade level whichever is higher See Figure 18 for alternate method to achieve 12 above snow level 2 The minimum distance for a direct vent 2 pipe installation from any door openable window or air gravity inletis 1 ft below 1 ft horizontally or 1 ft above 3 The vent termination shall be a minimum of 3 ft above any forced air inlet within 10 ft 4 The vent termination shall be located at least 4 ft horizontally from any electric meter gas meter regulator and any relief equipment These distances apply ONLY to U S installations In Canada the Cana dian Fuel Gas Code takes precedence Downflow Furnace 13 9 16 lt vent
41. inducer and the conditioned air blower All other sys tem functions will be inoperable until the limit circuit closes While the limit is open the red LED will pulse at a rate of 1 blink per unit time 3 The furnace control checks for continuity across the pressure switch 24 VAC If the pressure switch is closed the heat mode sequence will not continue If it remains closed for 10 seconds the red LED will blink 3 times repetitively until the fault condition clears The inducer is energized The pressure switch will close If the pressure switch does not close after 10 seconds the fault LED will blink 2 times repetitively and the inducer will continue to run until the switch is closed 6 The inducer will pre purge for 30 seconds and then the igniter will start its warm up as follows as 10 114 12 Initial Power up After 30 seconds ofigniter 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 upis reduced by 3 seconds on each subsequent call for heat until ignition failure occurs Upon ignition failure the warm up is in creased by 3 seconds on the next try If successful the timing remains fixed at this level In general whenever ignition failure occurs the warm up interva
42. ions require the installation of amanual main shut off valve and ground joint union exter nal to the furnace The shut off valve should be 20 readily accessible for service and or emer gency use Consult the local utility or gas supplier for additional requirements regarding placement of the manual main gas shut off In the absence of local codes the gas line instal lation must comply with the provisions stated in the Federal Manufactured Home Standard H U D Title 24 part 280 and the National Fuel Gas Code ANSI Z223 1 NFPA 54 or CAN CGA B149 installation codes A drip leg should be installed in the vertical pipe run to the unit Table 7 lists gas flow capacities for standard pipe sizes as a function of length in typical applications based on nominal pres sure drop in the line NOTE Gas piping must not be run in or through air ducts gas vents etc Compounds used on threaded joints of gas piping must be resistant to the actions of lique fied petroleum gases CAUTION Do not use matches lighters candles or other sources of open flame to check for gas leaks NOTE When pressure testing gas supply lines at pressures greater than 1 2 psig 14 in water column the furnace must be discon nected from the gas supply piping system to prevent damage to the gas control valve Main Blower Control Burner Box Gas Valve Floor Alt Gas Line Entry Figure 22
43. iping is not run in or through the return duct system Test the negative pressure in the closet with the air circulating fan operating at high speed and the closet closed The negative pressure is to be no more negative than minus 0 05 inch water column For floor return systems the manufactured home manufacturer shall affix a prominent marking on or near the appliance where it can be easily read when the closet door is open The marking shall read ti CAUTION HAZARD OF ASPHYXIATION Do not cover or restrict return air opening l Air conditioning systems may require more duct register and open louver area to ob tain necessary airflow Use NORDYNE s certiduct program to determine proper duct size for A C DUCTED RETURN AIR M3 furnaces with model numbers ending in AW or BW are factory configured for the return air to flow through the front louvered door The return air may also be attached to either side or the top of the furnace cabinet using a field installedkit Referto Table 12 forthe NORDYNE ducted return kit P N number The location and size of the side and top return air connections are shown in Figure 1 The filter size for the side return air is 20 x 20 x 1 For top return the filter size is 24 x 16 x 1 M3 furnaces with model numbers ending in BWT are factory configured for the return air to enter the top of the furnace 20 14 1 2 2 3 4 be REAR WALL OF
44. itor will try again to ignite the main burners This process may have to be repeated several times before the burners will ignite Once the burners are lit check all gas connections for leaks again with the soap and water solution If the solution bubbles there is a gas leak which must be corrected 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 verted from natural gas to propane gas or vise versa the manifold pressure of the gas valve will be set to pressure listed in Table 9 Manifold Pressure In WC Natural Gas 3 5 Propane LP Gas 10 0 Type of Fuel Table 9 Manifold Pressure COMPLETING THE CONVERSION 1 Affix the gas valve conversion label found in the package with the orifices to the unit rating plate 2 Run the appliance through a complete cycle to assure proper operation 24 CAUTION To avoid electric shock personal injury or death turn off the power at the disconnect or the main service panel before making any electrical connections ELECTRICAL WIRING General Electrical connections must be made in accor dance with all applicable local codes and ordi nances and with the current revision of the National Electric Code ANSI NFPA 70 For Canadian installations electrical connec tions and
45. l is increased by 3 seconds on the next try And if success ful it remains there Minimum and maxi mum warm up time limits are set at 6 and 54 seconds respectively The furnace control must prove flame via the flame sensor 5 seconds after the gas valve opens If flame is sensed all burn ers are on and the ignitor cools off If no flame is sensed the gas valve closes immediately and the inducer continues to run A second trial for ignition step 6 begins if no flame is sensed On the fifth try for ignition the furnace control is locked out and the red LED will blink 4 times repetitively The thermostat must be opened for at least ten seconds to reset the furnace control after a lock out Oth erwise the furnace will attempt another ignition sequence in 1 hour The furnace control energizes the cir culating air blower on the heating speed 30 seconds after the gas valve circuit is energized When the thermostat has been satisfied gas valve is de energized The inducer is de energized after a 30 second postpurge The furnace control keeps the circulating air blower energized for 120 seconds factory set or 60 90 or 180 seconds field adjustable See Figure 27 Abnormal conditions If a limit opens during operation the inducer and circulating air blower continue to operate The gas valve is de energized immediately The blowers continue to operate until the limit closes When the limit closes the inducer blow
46. late Face plates must be fastened to the wall and the outside one must be flashed as appropriate to prevent entry of water When the above kits are not used the following steps are required 1 Check the hole size cut through the exte rior wall Insure that the hole diameter is less than the diameter of the couplings to be used 18 2 Extend the vent pipe through the wall approximately 1 and seal the area be tween the wall and pipe 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 degree termination elbow and is pointing downward as shown in Figures 19 amp 20 Note that a combustion air intake must be provided with an elbow opening downward When the vent pipe must exit an exterior wall close to the grade or expected snow level a riser should be provided as shown in Figure 18 Insulation is required to prevent freezing of this section of pipe Vertical Venting For vertical venting either the configuration shown in Figure 20 or the Concentric Vent Termination Kit may be used Vertical venting is one of the shortest routing methods when piping vents for furnaces The M3 furnace operates trouble free when the furnace is in stalled with a shorter vent e The inlet for the combustion intake pipe must be extended atleast one foot above the roofline or snow accumulation
47. lectrical power before proceeding with the conversion To Turn Off Fuel Supply to the Appliance 1 Set the room thermostat to OFF or its lowest temperature setting 2 Turn OFF the main gas supply to the appli ance at the manual valve outside of the appliance casing 3 Remove the control access panel lou vered door 4 Movethe appliance gas valve lever knob to the OFF position 5 Turn OFF the electrical power to the appli ance CAPACITY OF BLACK IRON GAS PIPE CU FT PER HOUR FOR NATURAL GAS SPECIFIC GRAVITY 0 60 NOMINAL LENGTH OF PIPE RUN BLACK IRON feet PIPE DIAMETER in 10 20 30 40 50 60 70 80 1 2 130 90 75 65 55 50 45 40 3 4 280 190 150 130 115 105 95 90 1 520 350 285 245 215 195 180 170 1 1 4 1050 730 590 500 440 400 370 350 11 2 1600 1100 890 760 670 610 560 530 The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace 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 Cubic Feet Input To Furnace Btu hr PerHourRequired 7 Heating Value of Gas Btu Cu Ft Table 7 Capacity of Black Iron Gas Pipe cu ft per hour for Natural Gas specific gravity 60 21 To Remove the Burner Assembly 1 Follow the instructions
48. lwhichexperiencestheleast nate above any public walkways exposure to winter winds 17 Horizontal Venting Vent and combustion air intake terminations must be as shown in Figure 19 unless the concentric vent termination kit is used A WARNING Ensure thatthe 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 resultin furnace vibration In severe cases the furnace willcycle due to the intermittent contact between the flame and the flame sensor If you note these oscillations occurring check the vent configuration Make sure that the exhaust vent does not have a 90 degree termination For horizontal venting either the Horizontal Exterior Vent Mounting Kit or the Concentric Vent Termination Kit may be used See Table 12 For Canadian installations please refer to the Canadian Installation Code CAN CGA B149 1 or 2 and or local codes The Horizontal Exterior Vent Mounting Kit con sists of two face plates and an insulating gas ket to seal the exterior surface A hole sized closely to the pipe diameter must first be cut through the wall A short length of pipe is then cut such that it can penetrate the wall and be held in place by closely fitting standard cou plings The face plates are retained on both sides of the wall by the couplings and the gasket is retained against the wall by the outer face p
49. nd upon the type of conversion sea level or high altitude natural gas or LP gas To Convert the Unit to the Alternate Gas 1 Remove the orifice bag from the manifold of the unit Install the appropriate gas burner orifices into the gas manifold Remember if in stalling at altitudes above 4 000 feet to install the proper orifices shown in Table 8 When installing the new orifices DO NOT use pipe joint compound on the orifice threads Screw the orifices into the manifold by hand until snug to eliminate cross threading then tighten with a wrench Before installing an orifice check the face or side of the orifice for the drill number to ensure that it is the appropriate size For the conversion to the alternate fuel the gas valve regulator cap must be turned over as shown in Figure 23 You will unscrew the cap and reinstall for your in stallation After reinstalling the cap you will be able to read NAT for the conversion to natural gas or LP for the conversion to LP gas 9 a Furnace Rating Plate Input No of Btuh Burners Elevation 0 2000 Furnace Model Number M3RL Elevation 2000 4000 Elevation 8000 10000 Elevation 6000 8000 Elevation 4000 6000 __OGOAAEW 60 000 4 so 57 so 57 5 osoxarew ooo s e ient de em se se se Table 8 Approximate Orifice Size for Natural and LP Gases 22 Reinstalling the Burner Assembly 1 Reinstall the gas manifold a
50. nection when servicing controls Wiring errors can cause improper and dangerous operation Verify proper operation after servicing A ATTENTION Lors des op rations d entretien des commandes tiqueter tous les files avantdesles d connecter Touteerreur de c blage peut tre une source de danger et de panne S assurer du bon fonctionnement de l appareil apr s tout entretien Nominal Electrical Supply Cabinet Width in Furnace Input Btuh Maximum Minimum Maximum Minimum Operating Operating Furnace Low Voltage Wiring Install the thermostat per the manufacturer s instructions The low voltage 24 volt connec tions from the thermostat are made at the terminal strip on the control board in the furnace See Figure 28 for the proper connections for heating only two wire and heating cooling four wire applications The recommended minimum wire gauge for thermostat wiring is shown in Table 10 3 Amp Fuse Blower Off Timing COM 1 24V l TWIN Flame Signal Light Yellow O RA Status Light Red OOG Common Leads Neutrals Unused Motor Leads 258 101 Connect Neutral l WNH 9v4 TOG DO OG Lead of Electronic Air Cleaner and or Humidifier Here m gt Oo ZN LV3H 1009 HWNSX I WNH
51. ns 4 Combustion products must be discharged outdoors connect this furnace to an ap proved vent system only as specified in pages 14 19 of these instructions 5 Never test for gas leaks with an open flame Use a commercially available soap solution made specifically for the detection of leak to check all connections 6 Always install furnace to operate within the furnace s intended temperature rise range with a duct system that has an external static pressure within the allowable range as specified in page 4 of these instruc tions See furnace rating plate 7 When a furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace the return air shall also be handled by duct s sealed to the furnace casing and terminating outside the space contain ing the furnace Note This section only applies to furnaces installed with side or top return air 8 A gas fired furnace for installation in a residential garage must be installed as specified in page 7 of these instructions 9 The furnace is not to be used for tempo rary heat of buildings or structures under construction M3 series furnaces are air conditioning ready as shipped The furnace cooling capacities of the blower motor speed taps are shown in 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 manuf
52. other appliance even if that appliance is of the condensing type Common venting can result in severe corrosion of other appliances or their venting and can allow combustion gases to NOTES MAXIMUM Subtract3 5 ft foreach additional 3 90 degree elbow DIRECT VENT DUAL Two45degree elbows are equivalentto one 90 degree elbow APPLICATION PIPE LENGTH ft One short radius elbow is equivalent to two long radiug elbows PVC CPVC or ABS Inlet Outlet Donotinclude termination elbowsin calculation of ventlength SCH 40 Pipe Size 3 Thistable is applicable for elevations from sea level to 4000 ft Forhigher elevations decrease vent pipe lengths by 8 pe Model M3RL 060 so 50 1000ft ofaltitude Model M3RL 080 so 5o Only the above pipe materials are approved for use with thes condensing furnaces Table 6 Vent Table E INSIDE ag ZZ MU Ci Z o VENT TERMINAL amp AIR SUPPLY INLET AREA WHERE TERMINAL IS NOT PERMITTED leo Canadian Installations US Installations Clearance above grade veranda porch 12 inches 30 cm 12 inches 30 cm deck or balcony Clearance to window or door that may be 6 inches 15 cm for appliances lt 10 000 6 inches 15 cm for appliances lt 10 000 Btuh 3 kW 12 inches 30 cm for Btuh 3 kW 9 inches 23 cm for appliances gt 10 000 Btuh 3 kW and lt appliances gt 10 000 Btuh 3 KW and lt 100 00 Btuh 30 kW 36 inches 91 cm
53. r all electrical field wiring ex O CE g n rateur d air chaud doit tre install conform ment aux instructions du fabricant et aux codes locaux En l absence de code local respecter la norme ANSI Z223 1 institul 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 Institute Inc 1430 Broadway New York NY 10018 NFPA publications are available by writing National Fire Protection Association Batterymarch Park Quincy ME 02269 LOCATION The furnace must be installed on a level sur face and as close to the center of the air distribution system as possible See Figure 1 for overall dimensions to determine the re quired clearances in hallways doorways stairs etc to allow the furnace to be moved to the installation point The furnace must be in stalled so that all electrical components are protected from water Minimum clearances to combustible materials are listed in Table 4 Access for positioning and servicing must be considered when locating the unit This furnace is certified for use on wood flooring The furnace must be installed on a solid surface and must be level front to back and side to side This furnace must not be installed directly on carpeting tile or any com CLOSET ALCOVE ALL MODELS Inches Inches Front Back Sides Vent Top Duct Plenum w Coil Box w o Coil Box
54. red housing products in your area MANUFACTURER WARRANTY OWNER 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 prop erly All gas furnaces are manufactured for Natural gas and must be field converted when using L P gas A warranty certificate with full details is included with these instructions However NORDYNE will not be responsible for any costs found nec essary to correct problems due to improper setup improper installation furnace adjustments improper operating procedure on the part of the user etc Some specific examples of service calls which cannot be included in warranty payments are 1 Converting the furnace to use another type of gas 2 Repairing duct work in the home found to be faulty 3 Correcting wiring problems in the electrical circuit supplying the furnace 4 Resetting circuit breakers blown fuses or other switches 5 Correcting problems due to improper gas supply pressure to the furnace 6 Providing instructional training on how to light and operate the furnace 7 Furnace problems caused by installation of an air conditioner heat pump or other air comfort devices 8 Revising installation of the furnace flue assembly 9 Adjusting or calibrating of thermostat 10 Any construction debris which falls into the flue system
55. ssembly to the burner box with the four 4 fasteners which were removed earlier 2 Carefully reinstall the burner box into the unit After installing the burner inspect the alignment of the burners with the heat exchanger tubes The center of the burn ers should be aligned with the center of the tubes 3 Reconnect the gas piping to the gas valve 4 Reconnectthe wires to the gas valve termi nals 5 Reconnectthe rubber pressure tubes to the gas valve and the burner box Reinstall the burner access cover plate 6 Reconnect the ignitor at the 2 position plug 7 Reconnect the flame sensor wire to the burner box Pressure Gauge Installation NOTE For natural gas installations the in coming gas line pressure at the gas valve inlet must be between 4 5 WC and 10 0 WC For LP gas installations the incoming gas line pres sure at the gas valve inlet must be between 11 0 WC and 14 0 WC This pressure can be checked at the inlet end of the gas valve using a pressure gauge or U tube manometer which must be installed according to the manufacturer s supplied instructions LIGHTING AND ADJUSTMENT OF THE APPLIANCE 1 Turn ON the gas at the manual valve outside of the unit 2 Check all gas connections for leaks with a soap and water solution If the solution bubbles there is a gas leak which must be corrected Do NOT use an open flame to check for gas leaks 3 Turn ON the electrical power to the appli ance
56. t and primer must conform to ATSM Standard D2564 for PVC and Standard D2235 for ABS When joining PVC piping to ABS use an appropriate solvent cement and procedure per the piping manufacturer s recommendation and ASTM Standard D3138 Vent Pipe Installation Pipe Routing and Support Route piping as directly as possible between the furnace and the outdoors and remember that routing affects pipe length limitations per Table 6 Locate the combustion air intake and the vent exhaust in the same atmospheric pressure zone i e both must exit the building though the same portion of exterior wall or roof Vent piping must be sloped upwards not less than 1 4 per foot in the direction from the furnace to the terminal This is to ensure that any condensate flows back to the furnace where it can be disposed of through the condensate disposal system 16 CAUTION Combustion air must not be drawn from occupied spaces and a corrosive atmosphere The quality of outdoor air must also be considered Be sure that the combustion air intake is not located near a source of solvent fumes or other chemicals which can cause corrosion of the furnace combustion system Piping must be mechanically supported so that its weight does not bear down on the furnace Supports must be at intervals no greater than five feet and at smaller intervals if necessary to ensure that there are no sagging sections to trap water See Figures 16 amp 17 T
57. tabs d Secure front with one 1 fastener at each corner See Figure 13 or 14 NOTE Additional fasteners may be used at rear sides or through door frame as desired to secure furnace to closet or alcove framing 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 directly to the furnace Codes refer to this type of installation as direct vent or two pipe installation Provisions must be made for adequate supply of air for combustion and ventilation For United States installations the adequacy of air provisions can be determined by consulting the current version of the National Fuel Gas Code ANSI Z223 1 NPFA 54 For Canadian installations requirements are specified in the National Standard of Canada CAN CGA B149 1 amp 2 Consult local codes for special requirements NOTE If the furnace is operated without adequate air for combustion and ventilation it may not perform properly Furnace components may be strained by high temperature and could fail prematurely A WARNING The combustion air piping must not be blocked or restricted in any manner A WARNING Furnace installation using methods other than those described in the following sections must comply with the National Fuel Gas Code and all applicabl
58. tabs under and up tightly against the supply air duct See Figure 10 NOTE The duct connector is designed for use on ducts 12 in width When using the connec tor on 12 wide ducts there may be insufficient clearance to bend the tabs on two sides of the duct connector In such cases the tabs may be attached to the sides of the duct by using sheet metal screws or other suitable fasteners See Figure 11 If sealant mastic or tape is used to provide a better seal it should be approved by applicable national or local codes 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 1 Score and cut the top of the metal duct as indicated in Step 1 or Step 2 With Step 1 choice also cut out the metal from the shaded area A 2 Fold the duct flap B up See Step 3 TABS DUCT 1 INSERT DUCT PLENUM CONNECTOR INTO DUCT CUT OUT yor TABS i DUCT 2 BEND BOTTOM TABS OVER AND ONTO THE UNDERNEATH DUCT SERVICE Figure 10 Installation of Duct Connector Duct Connector Duct Narrow Duct Figure 11 Narrow Duct Installation STEP 1 Fold Back Flap B Cut Area A Area A CS Top of Duct fe Fold Back Flap B Bend Duct Connector Tabs Up and Over along length of duct
59. ticipator according to the ther mostat manufacturer s instructions for heat anticipator settings VENTILATION Ventilation must be provided for homes built to HUD Manufactured Homes Safety and Con struction Standards This ventilation canbe sup plied by the VentilAire Ill or VentilAire IV acces sories See Table 12 Alternate means to pro vide the ventilation air must meet the require ments of all applicable local and federal codes For installation of the VentilAire III or IV follow the instructions provided with the VentilAire kit START UP AND ADJUSTMENTS General Prior to start up verify that 1 The line voltage power leads are securely connected that the polarity of the con nections is correct and that the furnace is properly grounded 2 The thermostat wires R W Y and G are securely connected to the correct leads on the terminal strip of the circuit board 3 The natural gas line service pressure must not exceed 10 0 in water column 0 36 psig and must not be less than 4 5 in water column 0 16 psig For LP gas the line service pressure must not exceed 14 in water column 0 51 psig and must not be less than 11 0 in W C 0 40 psig 26 A C Condensing Unit x Condensing Unit Control Box oo Blower Off Bene Timing TWIN Connect R amp W For 7 4 Heating P Room Flame Signal Light O Yellow
60. ucun t l phone dans le b timent e Evacuer l immeuble imm diatement e Appeler imm diatement le fournisseur de gaz en employant le t l phone d un voisin Respecter la lettre les instructions du fournisseur de gaz e Si personne ne r pond appeler le service des incendies L installation et l entretien doivent tre effectu s par un installateur qualifi un organisme de service ou le fournisseur de gaz Q In In BW Models 4 BWT 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 LEAVE THESE INSTRUCTIONS WITH THE HOMEOWNER TABLE OF CONTENTS General 4 Unit Dimensions eects 4 Shipping Weights 4 Furnace Specification ccccce 4 Air Flow Data scoccare 4 Owner s Information 5 Installation Requirements 00 00n 6 LOCALOM nessas 7 Clearance eiiis inin iiias 7 Circulating Air Supply e 7 Return Air Provisions 8 Air Distri
61. ure 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 Flame Roll Out Switch This switch pro vides flame roll out protection to the furnace and combustion air inlet pipe MAINTENANCE It is recommended that the furnace be checked yearly Ata minimum this check should include the following items WARNING Toavoidelectric shock personalinjury or death turn off the power at the disconnect or the main service panel before performing any maintenance A WARNING Holes inthe vent pipe or heat exchanger can cause products of combustion to enter the occupied space Replace the vent pipe or heat exchanger if leaks are found Failure to prevent products of combustion from being circulated into the occupied space can crate poten tially hazardous conditions including carbon monoxide poisoning thatcould result in personal injury or death Combustion Air and Vent System Check the combustion air and vent pipe to ensure that it is not damaged corroded or blocked by debris Any damaged section of vent pipe must be replaced and any obstruc tion or blockage must be removed prior to operating the furnace Air Filter An air filter is supplied with the furnace as shipped from the factory Filters should be changed or cleaned monthly

Nordyne M3RL Furnace User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents