Nordyne AND M5S, SERIES M1B installation instructions Furnace Controls & Functions

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4.When call for heat is satisfi ed, the thermostat contacts open and the gas valve shuts off gas fl ow.

WARNING:

Should overheating occur, or the gas supply fails to shut off, shut off the manual gas valve to the furnace before shutting off the electrical supply.

AVERTISSEMENT:

En case de température excessive, ou sail est impossible de cooper l’alimentation en gaz, fermer le robinet manuel d’alimentation en gaz du générateur d’sir chaud avant de cooper l’alimentation électrique.

FURNACE CONTROLS & FUNCTIONS

Furnace On-Off Switch

This switch turns electrical power to the furnace on and off. The switch must be set in the ON position for the furnace to operate. For M1G models, in warm weather there is a possibility of the blower turning on periodically or operating continuously due to a heat buildup within the furnace by a combination of warm weather and heat from the pilot. This is normal operation as long as there is power to the furnace and the furnace On-Off switch is in the ON position. If blower operation is not desired, the furnace On- Off switch may be set in the OFF position to cut the electrical power to the furnace.See Figure 35.

Limit Control

This furnace is protected by two high temperature safety limit switches. The auxiliary (upper) limit switch and the high temperature (lower) limit switch are automatic reset types. If either limit trips, the burner will shut off. If either limit switch trips off again soon after resetting, set the furnace furnace On-Off switch to the OFF position and call your authorized serviceman. See Figure 35.

Gas Valve

The gas valves for the gas furnaces are a 100% shut-off type and will fail safe, if for some reason the gas is turned off. The valve is a “step-open” type for M1G models and “slow-open” for M1M and M1B models which means it opens to a low-fire position, and after a few seconds, “steps- open” to high-fi re.

Roll Out Switch (M1G - 056 & 070)

The furnace is protected by a manual reset safety switch located on the bottom left hand side of the combustion pipe.

Oil Burner Primary Control

The primary control for oil gun furnaces starts the burner, monitors a safe operating cycle, and shuts the burner off at the end of a heating cycle. The control uses a light sensing transducer to determine if fuel ignition has been successfully attained. If ignition is not attained by the end of the safety ignition timing period, the control shuts the burner off and enters“lock-out.”See Figure 35.

Summer Cooling - (B, C, & D Series)

Your furnace is A/C ready, equipped with A/C relay and transformer. The unit is equipped to use a 4-wire thermostat. When using a 5-wire thermostat, RC and RH should be jumped (see instructions included with thermostat).

Upper

 

Limit

Lower

Switch

Limit

 

Switch

Furnace

Fan

On-Off

Control

Switch

 

 

Oil

 

Burner

 

Control

Oil

 

Pump

 

Figure 35. Furnace Controls - Oil Furnace

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Contents For installation Installation InstructionsReturn Air Connections Supply Air Connections Homeowner Information Installer Information InformationStanding Pilot Models Direct Ignition Models Oil Gun Models Requirements and Codes Safety InformationGeneral Installation Gas Piping and Gas Pipe Pressure TestingSafety Combustion and Ventilation AirMinimum Clearances General InformationALL Models Closet Alcove Applications AssemblyUnit Location BlowerReturn Air Connections Circulating AIR RequirementsGas piping is not run in or through the return duct system Supply Air ConnectionsDetermine which duct connector to use from Furnace InstallationGeneral Information Requirements and CodesDuct Connector Sizes Standard Duct Connector Installation Cut-Out Dimensions for Standard Duct ConnectorsInstalling The Furnace Duct Connector TabsRequired ceiling and roof cut-out openings see Roof Jack InstallationRoof Jack Selection Application NotesSlant Deck Flashings Roof Jack Series If Roof Pitch is Slant Deck FactorInstallation of Transit-Mode Venting System Installing The Roof JackConnect fl ue pipe to fl ue collar of furnace. See Figure Secure fl ashing with appropriate fastenersElectrical Information Line Voltage WiringWire Heating Heating/Cooling Low Voltage WiringThermostat Wire Gauge Thermostat Length Unit to T’STATImportant Notes Fuel Supply and PipingFuel line Hook-Up Oil Tank and Piping InstallationFuel Oil Type Leak CheckConversion to Propane LP Gas Honeywell Gas Valve High Altitude ConversionStanding Pilot Valve Lighting Instructions Standing Pilot ModelsOperating Instructions for Direct Ignition Models M1M Replace the furnace doorFor 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 Operating SequenceStanding Pilot w/Induced Draft Blowers M1M Models with Direct IgnitionFurnace Controls & Functions Standing Pilot Models TroubleshootingDirect Ignition Furnaces Including Gas Gun M1B Series see , Page Optional Accessories Burner will not start and the LED indicator isCad Cell Resistance when Sensing flame Cad cell is operational, replace the primary controlRed LED Indicator Status Control Module Status Indicators M1M SeriesControl Module Status Indicator M1B Control Module Status Indicator M5S SeriesInstaller Information MaintenanceAdditional Oil Furnace Maintenance Clean or replace the oil fi lter element at the oil tankM1GB Burner Direct Blower TonsM1MC Manifold Pressure Natural Gas 3.5 w.cOrifi ce Size Nat. Gas Orifi ce Size LP Equivalent Orifice Sizes for High Altitude InstallationsOutput Mbtuh Orifi ce Size Nat. GasGas Flow Rates Cubic Feet per Hour GAS InformationModels Wiring DiagramsM1GH 077, 090 Models M1GB 056, 070 Models Gas AtmosphericWiring Diagram Steady OFF No power Blinking Wiring Diagram Installation Address Installation / Performance Check List
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