SPECTRUM INSTALLATION AND OPERATING INSTRUCTIONS Page 23Avoid placing the thermostat in areas that will notprovide an accurate measurement of the roomtemperature. Locating the thermostat behind a door, inan alcove, close to a source of thermal radiation or in adrafty area will cause poor or sporadic heating.For a thermostat that employs an adjustable heatanticipator, adjust the anticipator to match the currentmeasured in the thermostat circuit. An increasedanticipator setting may be necessary if the unit cyclesfrequently. If the room temperature over-shoots thethermostat setting, reduce the anticipator setting.Operating ControlThe preferred control setting for potable hot water is130˚F, 54˚C. The operating control should be set to thelowest setting that will satisfy the consumer's needs.WARNING: Setting the thermostat or operatingcontrol too high can result in scalding resultingin severe personal injury!High Limit (Aquastat)The high limit is located in the top control area of theboiler/water heater. A remote capillary bulb is run to awell on the outlet side of the supply header.The water heater high limit should be set a minimum of20°F, 11°C higher than the operating control. Refer tothe HOT WATER SUPPLY section for the proper supplywater temperature.Flow SwitchA fl ow switch is provided in the water outlet piping toprevent the boiler/water heater from firing withoutadequate water fl ow through the heat exchanger.MAINTENANCEWARNING: Disconnect electrical power and closethe manual gas shut off valve before performingmaintenance or severe personal injury mayresult!WARNING: Improper installation, adjustment,alteration, service or maintenance can causeproperty damage, personal injury, exposure tohazardous materials or loss of life. Installation andservice must be performed by a qualified installer,service agency or the gas supplier who mustread and follow the supplied instructions beforeinstalling, servicing or removing this boiler. Thisboiler contains crystalline silica materials thathave been identified as carcinogenic or possiblycarcinogenic to humans when inhaled.AVERTISSMENT: Une instqallation, un réglage,une réparation ou un entretien non comformeaux normes peut entraîner des dommagesmatériels, des blessures,exposition à desmatiéres dangereuses ou la mort. L’installationet l’entretien doivent être effectués par uninstallateur ou un service d’entretien qualifié oule foumisseur de gaz qui doivent avoir lu les in-structions foumies avant de faire l’installation,l’entretien ou l’enlèvement de la chaudière et lesrespecter, Cette chaudière contient desmatériaux qui ont été identifiés comme étantcancérogènes ou pouvant l’être.CAUTION: Servicing, inspection and adjustmentmust be done by a trained technician in accordancewith all applicable local and national codes. Improperservicing or adjustment can damage the boiler/waterheater!WARNING: The ceramic combustion chambercontains crystalline silica. Wear a tightly fitteddust mask when removing the burners or heatexchanger to prevent inhalation of airborn fibers.Crystalline silica fibers have been identified ascarcinogenic, or possibly carcinogenic wheninhaled.The boiler/water heater should be cleaned andinspected once a year and before each heating season.Make sure that the burners and ignition components arefree from dust, soot, dirt, corrosion or other deposits thatwould impair the boiler’s performance. Refer to page 24for component identifi cation.CAUTION: Improper burner servicing can result inpremature burner failure voiding the warranty!Burner Drawer & Burner Removal1. Close the manual shutoff valves in the gas supplylines and turn off electrical power to the boiler/waterheater.2. Disconnect the gas train from the gas supply pipingat the ground joint union.3. Remove the fl ame roll-out shield.4. Remove the two screws that attach the burner drawerto the base panel, Figure 12.5. Disconnect the electrical wires going to the gas valveand burner drawer.6. On intermittent pilot models disconnect the ignitioncable from the ignition module.7. Pull the burner drawer out until the burners are fullyexposed.8. Inspect each burner for damage or signs of deterio-ration. Use a brush or compressed air to remove anydebris from the burner ports.9. DO NOT install damaged or badly corrodedburners, replace them.10. Reinstall the burner drawer and fl ame roll-out shieldfollowing the removal steps in reverse order.11. Reconnect all electrical wires.12. Reconnect the gas piping.