Nordyne SERIES M1B, AND M5S Oriﬁ ce Size Nat. Gas Oriﬁ ce Size LP, Output Mbtuh

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	FURNACE			ORIFICE SIZE AND				ALTITUDE - FEET
	FURNACE			ORIFICE SIZE AND	SEA	2,000	3,000	4,000	5,000	6,000	7,000	8,000	9,000	10,000
	MODEL			OUTPUT CAPACITY	SEA
	MODEL			OUTPUT CAPACITY	LEVEL
	M1M/M1G			Oriﬁ ce Size - Nat. Gas	29	29	30	30	30	30	31	31	31	32
	M1M/M1G			Oriﬁ ce Size - LP	45	46	47	47	47	48	48	49	49	50
	- 056
	- 056			Output - MBTUH	45.4	41.8	40.1	38.5	37.0	35.5	34.1	32.7	31.4	30.2
				Output - MBTUH	45.4	41.8	40.1	38.5	37.0	35.5	34.1	32.7	31.4	30.2
	M1M/M1G			Oriﬁ ce Size - Nat. Gas	24	25	26	27	27	28	28	29	29	30
	M1M/M1G			Oriﬁ ce Size - LP	42	42	43	43	43	44	44	45	46	47
	- 070
	- 070			Output - MBTUH	56.7	52.3	50.2	48.2	46.2	44.4	42.6	40.9	39.3	37.7
				Output - MBTUH	56.7	52.3	50.2	48.2	46.2	44.4	42.6	40.9	39.3	37.7
				Oriﬁ ce Size - Nat. Gas	21	23	23	24	25	26	27	28	28	29
	M1M - 077			Oriﬁ ce Size - LP	40	41	42	42	42	43	43	44	44	45
				Output - MBTUH	61.7	56.9	54.6	52.4	50.3	48.3	46.4	44.5	42.7	41.0
				Oriﬁ ce Size - Nat. Gas	21	23	23	24	25	26	27	28	28	29
	M1G - 077			Oriﬁ ce Size - LP	40	41	42	42	42	43	43	44	44	45
				Output - MBTUH	59.9	55.2	53.0	50.9	48.9	46.9	45.0	43.2	41.5	39.8
				Oriﬁ ce Size - Nat. Gas	17	18	19	19	20	21	22	23	24	26
	M1M - 090			Oriﬁ ce Size - LP	36	37	38	38	39	40	41	41	42	43
				Output - MBTUH	71.7	66.1	63.5	60.9	58.5	56.1	53.9	51.7	49.7	47.7
				Oriﬁ ce Size - Nat. Gas	17	18	19	19	20	21	22	23	24	26
	M1G - 090			Oriﬁ ce Size - LP	36	37	38	38	39	40	41	41	42	43
				Output - MBTUH	69.7	64.2	61.7	59.2	56.8	54.6	52.4	50.3	48.3	46.3
				Oriﬁ ce Size - Nat. Gas	26	27	28	28	28	29	29	30	30	30
	M1B - 066			Oriﬁ ce Size - LP	43	44	44	44	45	45	46	47	47	48
				Output - MBTUH	52.6	48.5	46.6	44.7	42.9	41.2	39.6	38.0	36.5	35.0
				Oriﬁ ce Size - Nat. Gas	18	19	19	20	21	22	23	24	26	27
	M1B - 086			Oriﬁ ce Size - LP	37	38	39	39	40	41	42	42	43	43
				Output - MBTUH	68.2	62.9	60.3	57.9	55.6	53.4	51.2	49.2	47.2	45.3

NOTES: For Canadian high altitude (2,000 - 4,500’), reduce gas manifold pressure to 3.0” W.C. for natural gas and 9” W.C. for LP gas. (Includes 4% Input Reduction for Each 1,000 Feet). These specs do not apply to oil furnace installations. Reference Sources: ANSI Z233.1 & NFPA 54, National Fuel Gas Code.

Table 11. Equivalent Oriﬁce Sizes for High Altitude Installations

M1/M5*B Models and for use with Blower Kit No. 903773 1/4 Hp 3 Speed

Furance Input	Heating Speed			Cooling Speed/ Evap Coil
Furance Input	Setting			2 Ton	2-1/2 Ton		3 Ton
	Setting			2 Ton	2-1/2 Ton		3 Ton
086, 090		H		L	M		H
066, 070, 077		M		L	M		H
56		L		L	M		H
M1/M5*C Models and for use with Blower Kit No. 903413 1/2 Hp 4 Speed
	Heating			Cooling Speed/ Evap Coil
	Heating
Furance Input	Speed		2 Ton	2-1/2 Ton & 3 Ton	3-1/2 Ton		4 Ton
	Setting		2 Ton	2-1/2 Ton & 3 Ton	3-1/2 Ton		4 Ton
	Setting

077, 086, 090	ML		L	ML	MH		H
056, 066, 070	L		L	ML	MH		H
M1/M5*D Models & for use with Blower Kit No. 903890 3/4 Hp 4 Speed
	Heating			Cooling Speed/ Evap Coil
	Heating
Furance Input	Speed		2 Ton	2-1/2 Ton & 3 Ton	3-1/2 Ton & 4 Ton		5 Ton
	Setting		2 Ton	2-1/2 Ton & 3 Ton	3-1/2 Ton & 4 Ton		5 Ton
	Setting

077, 086, 090	ML		L	ML	MH		H
056, 066, 070	L		L	ML	MH		H

Table 12. A/C Blower Speed Selection Chart

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Contents Installation Instructions For installationStanding Pilot Models Direct Ignition Models Oil Gun Models Homeowner Information Installer Information InformationReturn Air Connections Supply Air Connections Safety Information Requirements and CodesGas Piping and Gas Pipe Pressure Testing General InstallationSafety Combustion and Ventilation AirALL Models Closet Alcove General InformationMinimum Clearances Assembly ApplicationsUnit Location BlowerCirculating AIR Requirements Return Air ConnectionsGas piping is not run in or through the return duct system Supply Air ConnectionsFurnace Installation Determine which duct connector to use fromGeneral Information Requirements and CodesCut-Out Dimensions for Standard Duct Connectors Duct Connector Sizes Standard Duct Connector InstallationDuct Connector Tabs Installing The FurnaceRoof Jack Installation Required ceiling and roof cut-out openings seeRoof Jack Selection Application NotesRoof Jack Series If Roof Pitch is Slant Deck Factor Slant Deck FlashingsInstalling The Roof Jack Installation of Transit-Mode Venting SystemConnect ﬂ ue pipe to ﬂ ue collar of furnace. See Figure Secure ﬂ ashing with appropriate fastenersLine Voltage Wiring Electrical InformationLow Voltage Wiring Wire Heating Heating/CoolingThermostat Wire Gauge Thermostat Length Unit to T’STATFuel Supply and Piping Important NotesOil Tank and Piping Installation Fuel line Hook-UpConversion to Propane LP Gas Leak CheckFuel Oil Type High Altitude Conversion Honeywell Gas ValveLighting Instructions Standing Pilot Models Standing Pilot ValveReplace the furnace door Operating Instructions for Direct Ignition Models M1MPilot Flame Standing Pilot Only Burner AdjustmentsFor oil, shut off all valves Replace the furnace door Combustion Air Factory Combustion Air SettingsElectrode Setting Oil Gun Only Operating Sequence Standing PilotStanding Pilot w/Induced Draft Blowers M1M Models with Direct IgnitionFurnace Controls & Functions Direct Ignition Furnaces Including Gas Gun M1B Series see , TroubleshootingStanding Pilot Models Page Burner will not start and the LED indicator is Optional AccessoriesCad Cell Resistance when Sensing ﬂame Cad cell is operational, replace the primary controlControl Module Status Indicators M1M Series Red LED Indicator StatusControl Module Status Indicator M1B Control Module Status Indicator M5S SeriesMaintenance Installer InformationAdditional Oil Furnace Maintenance Clean or replace the oil ﬁ lter element at the oil tankBurner Direct Blower Tons M1GBM1MC Manifold Pressure Natural Gas 3.5 w.cEquivalent Oriﬁce Sizes for High Altitude Installations Oriﬁ ce Size Nat. Gas Oriﬁ ce Size LPOutput Mbtuh 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