Field Controls WML-C - Manuals

30318 R4 9/9/2005 5 through a refrigeration unit unless the unit is specifically approved for such service. Generally, a six-inch clearance between the air conditioning evaporator coil and the heat exchanger will provide adequate airflow through the evaporator coil. The blower speed must be checked ...

30318 R4 9/9/2005 7 OPTIONAL SIDE WALL VENTING Certain WML-C AND MPL-B furnace models are manufactured to be installed as sidewall vented units. Please refer to Direct Venting Instructions, P/N 28888 included with the Vent Kit for details. Sidewall Venting ( Direct Venting ) requires the use of spec...

30318 R4 9/9/2005 8 main electrical panel; however, accessory equipment such as electronic air cleaners and humidifiers may be included on the furnace circuit. Although a suitably located circuit breaker can be used as a service switch, a separate service switch is advisable. The service switch is n...

30318 R4 9/9/2005 9 trunk ducts. These systems may require modification to provide some resistance to the airflow to prevent over-amping of the direct drive blower motor. Selecting a lower blower speed may correct this problem. Direct drive blower speeds are adjusted by changing the "hot" wi...

30318 R4 9/9/2005 10 BURNER ELECTRODES Correct positioning of the electrode tips with respect to each other, to the fuel oil nozzle, and to the rest of the burners is essential for smooth light ups and proper operation. The electrode tips should be adjusted to a gap of 5/32”, 1/16” ahead of the nozz...

30318 R4 9/9/2005 11 used in conjunction with multi-meters with temperature measurement capabilities. The return air should be measured at a point where the thermometer will be well within the air stream near the furnace return air inlet. Actual location is not particularly critical; however, avoid ...

30318 R4 9/9/2005 12 should be checked to ensure that all fan speeds are operating properly. OPERATING INSTRUCTIONS Before Lighting Open all supply and return air registers and grilles. Open all valves in oil pipes. Turn on electric power supply To Light Unit Set the thermostat above room temperatur...

30318 R4 9/9/2005 13 APPENDIX A- WML-C AND MPL-B BURNER SET UP WML-C AND MPL-B furnaces may be used with the following oil burners. Please note: The Beckett AF, and Riello 40F oil burners are for applications using indoor air for combustion only. For sidewall venting applications utilizing outdoor a...

30318 R4 9/9/2005 14 Table A-4 Riello Balanced Flue (BF) Burner Set-Up Riello Balanced Flue Series Oil Burners (For use with sidewall vented units using outdoor combustion air) Furnace Model Output BTU/Hr Burner Model Nozzle Pump Pressure Flow Rate Turbulator Setting WML-60CRB 59,500 40BF3 0.50 / 60...

30318 R4 9/9/2005 17 APPENDIX B: WIRING DIAGRAMS Beckett AF Burner Wiring Diagram

30318 R4 9/9/2005 18 Beckett AFII Burner Wiring Diagram

30318 R4 9/9/2005 19 Riello 40F3 and F5 Burner Wiring Diagram

30318 R4 9/9/2005 20 Riello 40BF3 Burner Wiring Diagram

30318 R4 9/9/2005 21 OPERATION OF OIL BURNER Once the furnace flue pipe, electrical and oil line connections have been made, use the following instructions to set the burner: Shut off the electrical power to the furnace. Install an oil pressure gauge to the pressure port on the oil pump. (Refer to t...

30318 R4 9/9/2005 22 APPENDIX C-R7184 TROUBLESHOOTING R7184 DETAILED SEQUENCE OF OPERATION (FIGURE 7) Power is applied to unit. The R7184 completes a self-diagnostic procedure. If no light or flame is present, and unit passes its self-diagnostic procedure, the control enters into the idle mode. Ther...

30318 R4 9/9/2005 26 R7184 LED DIAGNOSTIC LIGHT The LED diagnostic light has several functions. It indicates the state or mode in which the oil burner is operating. It will also indicate fault conditions, and help determine cad cell resistance while the burner is operating. NORMAL CONDITIONS : The L...

30318 R4 9/9/2005 29 TABLE C4: SYSTEM AND GENERAL TROUBLESHOOTING Problem Possible Cause Remedy Thermostat not calling for heat. Check thermostat and adjust. Also, check thermostat for accuracy; if it is a mercury switch type, it might be off level. No power to furnace. Check furnace switch, main el...

30318 R4 9/9/2005 30 TABLE C-4: SYSTEM AND GENERAL TROUBLESHOOTING continued Problem Possible Cause Remedy Electrodes out of adjustment or defective. Check electrode settings. Check electrodes for dirt build-up or cracks in porcelain. Poor transformer high voltage connections or defective transforme...

30318 R4 9/9/2005 31 TABLE C-4: SYSTEM AND GENERAL TROUBLESHOOTING continued Problem Possible Cause Remedy Airflow blocked or dirty air filter. Clean or replace air filter. Supply air temperature too hot. Insufficient airflow. Check all dampers. Open closed dampers including registers in unused room...