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NORA Oilheat Technicians Manual

1. Thermostat stuck, set too high, improperly located or defective. 2. Limit control defective or set too high. 3. Flow control valve stuck. 4. Motorized valve stuck. #5 No hot water Troubleshooting a “no hot water” call with an oil-fired water heater is basically the same as troubleshooting a no heat call; you check the burner and the limit control. When the hot water comes from a domestic hot water coil or storage tank, you should: 1. Check the aquastat settings. 2. Check to be sure the water level in the boiler is above the coil. 3. Check the mixing valve. 4. If there’s a storage tank installed: • Check the control setting. • Check the circulator. • If the tank seems to be full of hot water but the water coming from the hot tapping is cool, check the dip tube on the inlet to the tank. #6 Water leak Depending on the severity of the leak, this can be a minor inconvenience or a major problem. 1. USE CAUTION! Never work on electrical components while they are wet or when you’re standing on wet floors. Helpful hint—Treat all electrical circuits as if they were energized even when you’re sure they aren’t. Chapter 15 Service Procedures Your job is like a detective’s—you must figure out what happened, why it happened, how to fix it and how to keep it from happening again. Other causes for insufficient heat: A. Burner trouble 1. The burner might be underfired. Make sure that the burner’s firing rate is properly set for the boiler or furnace. B. Control circuit 1. Check the heat anticipator settings. 2. Check that the thermostat is properly located. Thermostats are affected by the heat generated by lamps, appliances or fireplaces and should not be located near any heat source. 3. Check that the limit controls and reverse acting aquastats are properly set. C. Heating systems 1. Check to be sure that the steam vents are operating properly. 2. Check that pipes and/or ductwork are properly insulated. 3. Check that airflow through air filters, radiators, or baseboard is not obstructed by dust, closed air dampers, carpet, furniture or curtains. 4. Check that the water level is adequate in steam systems. 5. Check that hot water systems are not air bound. 6. Check that blowers and their pulleys and belts are functioning properly. . #4 Too much heat When the customer complains of too much heat the most likely causes are: 15-10 Service Procedures


NORA Oilheat Technicians Manual
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