Nordyne SERIES M1B Cad cell is operational, replace the primary control, Optional Accessories

Page 28

the cad cell is operational, replace the primary control.

4.If the LED continues to fl ash at the interval listed above, verify that the control is not in restricted mode. If in restricted mode, reset it. If not in restricted mode, replace the control.

5.If the (LED indicator for R7184 control; green LED for 7505 control) stays off while the fl ame is on, check the cad cell sighting for view of the fl ame.

6.If the burner locks out, check the cad cell resistance. (See Table 8)

7.If the burner stays running, the system is operational.

8.If the (LED indicator for R7184 control; green

LED for 7505 control) is off, check the cad cell assembly after disconnecting the line voltage.

Burner will not start and the LED indicator is

flashing at 2 seconds on, 2 seconds off for R7184 (or the green LED is fl ashing for 7505).

•Hold the reset button down for 1 - 2 seconds. If LED indicator continues to fl ash, wait for 60 - 70 seconds. If it still continues to fl ash, replace the primary control.

•Honeywell R7184 control: To check cad cell resistance, press and release the button during the run mode, with the igniter off.The LED will

flash to indicate the cad cell resistance. For proper burner operation, it is important that the cad cell resistance is under 1600 Ohms. For cad cell resistance, see Table 8.

•Beckett 7505 control: To check cad cell resistance, unplug the cad cell leads (yellow wires) from the control.Measure the resistance with a meter in the conventional way (when a

flame is present).For proper burner operation, it is important that the cad cell resistance is under 1,600 Ohms.

OPTIONAL ACCESSORIES

Necessary when the Furnace is Used with Some Central Air Conditioners

If an air conditioner is installed that does not use the furnace blower for air distribution and operates independently of the furnace, the thermostat system must have an interlock to prevent the furnace and air conditioner from operating at the same time. This interlock system usually contains either a “Heat-Cool” switch which must be turned to one of the positions to activate heat or cool operation, or a positive “OFF” switch on the cooling thermostat.

The furnace must also be equipped with an automatic damper to prevent cold air from being discharged up around the heat exchanger (NORDYNE p/n 901996 for furnaces without coil cavity, or p/n 901083 with coil cavity). See Figure 36 or 37.Cold air may cause condensation inside the heat exchanger which can rust and lead to early failure.

Figure 36. Coil Cavity Damper

LED Flashes (Ohms)

Cad Cell Resistance

 

 

1

0-400

2

400-800

3

800-1600

4

>1600

Table 8. Cad Cell Resistance when

sensing flame

Figure 37. Damper without Coil Cavity

28

Page 27 Page 29
Image 28
Page 27 Page 29
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 CodesGas Piping and Gas Pipe Pressure Testing General InstallationSafety Combustion and Ventilation AirMinimum Clearances General InformationALL Models Closet Alcove 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-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 Operating Sequence Standing PilotStanding 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 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
Top Page Image Contents