Nordyne SERIES M1B For oil, shut off all valves Replace the furnace door, Burner Adjustments

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How to Shut Off Gas - Direct Ignition

1.Set the thermostat to the lowest setting.

2.Turn off all electric power to the appliance before servicing unit.

3.Set the furnace On-Off Switch to OFF.

•Honeywell (Figure 32):Turn gas control knob clockwise to OFF, Robertshaw (Figure 33): Push the gas control lever to OFF.

•For oil, shut off all valves.

4.Replace the furnace door.

Operating Instructions for Oil Gun Furnaces If your furnace model number begins with M5S*, the furnace is equipped with an ignition device which automatically lights the burner. Do not try to light this furnace manually.

1.Open all valves in the oil line.

2.Verify the fi re door is closed.

3.Set the furnace On-Off switch to ON.

4.Set the thermostat to the desired setting.

NOTE: M5 oil gun furnaces may be converted to gas gun in the field by using the proper conversion kit listed in the RPL.

Operating Instructions for Gas Gun Models If your furnace model number begins with M1B, the furnace does not have a pilot. Ignition is accomplished by a silicon carbide hot surface ignitor. A control module takes care of all lighting and timing functions. There are no external relays or timing devices. Do not try to light this furnace by hand. The control module is not field serviceable.

1.Before operation, smell for gas all around the furnace, especially near the fl oor because some gases are heavier than air and will settle on the fl oor.If you detect gas, STOP and follow all the safety instructions.

2.Set the thermostat to the lowest setting.

3.Turn off all electric power to the appliance.

4.Turn off the gas valve:

•Honeywell: push in the gas control knob and turn clockwise to OFF (Figure 32).

•Robertshaw: push the gas control lever to OFF (Figure 33).The lever cannot be placed in the off position unless it is pushed in slightly. DO NOT FORCE!

5.Wait ten minutes to clear out any gas. If you smell gas, STOP! and follow the safety information. If gas is not detected, proceed to the next step.

6.Set the furnace On-Offswitch to the ON position.

•Honeywell:turn knob on gas control counter clockwise to ON.

•Robertshaw: push the gas control lever to ON.

7.Turn electric power to the appliance ON.

8.Set the thermostat to HEAT and/or the desired temperature setting. The furnace should light in approximately 45 seconds. If the appliance will not operate, follow the instructions “How to Shut Off Gas - Direct Ignition Furnace” (page

21)and call your service technician or gas supplier.

In the event of any fl ashback or explosion, immediately shut off the furnace and call your service technician.

How to Shut Off Gas - Oil & Gas Gun

1.Set the thermostat to the lowest setting.

2.Turn off all electric power to the appliance at the breaker or fuse box.

3.Set the thermostat MODE switch to OFF.

4.Turn the gas valve OFF:

•Honeywell: push in and turn the gas control knob clockwise to the OFF position (Figure 32).

•Robertshaw - push the gas control lever to the OFF position (Figure 33).

5.Replace the furnace door.

NOTE: M1B gas gun furnaces may be converted to oil gun in the fi eld by using the proper conversion kit listed in the RPL

Burner Adjustments

Burner settings are made at the factory.However, these settings may change during shipping, handling, and installation. The following items should be checked and readjusted if necessary.

Gas Pressure

The gas pressure can be checked with a manometer at the pressure tap located on the side of the gas valve. The gas valve pressure regulator can be adjusted by removing the regulator selector stack and turning the slotted insert located directly under the selector stack. The regulator selector stack must be secured in place before each pressure reading is taken. Natural gas manifold pressure should be 3.5” W.C. and L.P. gas manifold pressure should be 10” W.C. Replace the gas pressure tap plug on the gas valve.

Pilot Flame (Standing Pilot Only)

The pilot fl ame can be adjusted by turning the pilot adjustment screw, located on top of the gas valve (See Figure 30, page 20). The pilot

flame height should be between 3/4” and 1.” The

flame tip should be visible just above the pilot bracket when viewed through the observation door. The same pilot orifi ce is used with both natural and LP gas.

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Contents Installation Instructions For installationReturn Air Connections Supply Air Connections Homeowner Information Installer Information InformationStanding Pilot Models Direct Ignition Models Oil Gun Models Safety Information Requirements and CodesSafety Gas Piping and Gas Pipe Pressure TestingGeneral Installation Combustion and Ventilation AirMinimum Clearances General InformationALL Models Closet Alcove Unit Location AssemblyApplications BlowerGas piping is not run in or through the return duct system Circulating AIR RequirementsReturn Air Connections Supply Air ConnectionsGeneral Information Furnace InstallationDetermine which duct connector to use from Requirements and CodesCut-Out Dimensions for Standard Duct Connectors Duct Connector Sizes Standard Duct Connector InstallationDuct Connector Tabs Installing The FurnaceRoof Jack Selection Roof Jack InstallationRequired ceiling and roof cut-out openings see Application NotesRoof Jack Series If Roof Pitch is Slant Deck Factor Slant Deck FlashingsConnect fl ue pipe to fl ue collar of furnace. See Figure Installing The Roof JackInstallation of Transit-Mode Venting System Secure fl ashing with appropriate fastenersLine Voltage Wiring Electrical InformationThermostat Wire Gauge Low Voltage WiringWire Heating Heating/Cooling Thermostat Length Unit to T’STATFuel Supply and Piping Important NotesOil Tank and Piping Installation Fuel line Hook-UpFuel Oil Type Leak CheckConversion to Propane LP Gas High Altitude Conversion Honeywell Gas ValveLighting Instructions Standing Pilot Models Standing Pilot ValveReplace the furnace door Operating Instructions for Direct Ignition Models M1MFor oil, shut off all valves Replace the furnace door Burner AdjustmentsPilot Flame Standing Pilot Only Electrode Setting Oil Gun Only Factory Combustion Air SettingsCombustion Air Standing Pilot w/Induced Draft Blowers Operating SequenceStanding Pilot M1M Models with Direct IgnitionFurnace Controls & Functions Standing Pilot Models TroubleshootingDirect Ignition Furnaces Including Gas Gun M1B Series see , Page Cad Cell Resistance when Sensing flame Burner will not start and the LED indicator isOptional Accessories Cad cell is operational, replace the primary controlControl Module Status Indicator M1B Control Module Status Indicators M1M SeriesRed LED Indicator Status Control Module Status Indicator M5S SeriesAdditional Oil Furnace Maintenance MaintenanceInstaller Information Clean or replace the oil fi lter element at the oil tankM1MC Burner Direct Blower TonsM1GB Manifold Pressure Natural Gas 3.5 w.cOutput Mbtuh Equivalent Orifice Sizes for High Altitude InstallationsOrifi ce Size Nat. Gas Orifi ce Size LP Orifi ce Size Nat. GasGAS Information Gas Flow Rates Cubic Feet per HourWiring Diagrams ModelsM1GH 077, 090 Models Gas Atmospheric M1GB 056, 070 ModelsWiring Diagram Steady OFF No power Blinking Wiring Diagram Installation / Performance Check List Installation Address
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