RBI SERIES 8800 Installation & Operation Manual

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RBI SERIES 8800 Installation & Operation Manual Manual pdf 25 page image

SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS Page 25CONTROL DESCRIPTIONBoiler ThermostatIf a thermostat is to be used to control the boiler alwaysfollow the instructions included with the thermostat.Proper location of the thermostat will ensure efficienttrouble-free operation of the boiler. Mount the thermostatto an inside wall at a height approximately five feetabove the floor.Avoid 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 operationcontrol 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 highlimit can be reset by depressing the black rubber plugin the front top jacket panel.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 flow switch is provided in the water outlet piping toprevent the boiler/water heater from firing withoutadequate water flow through the heat exchanger.Low Water CutoffIf the boiler is to be installed above radiation or ifrequired by other codes or regulations, install a lowwater cutoff in appropriate piping. Wire the switch andany external controls in series to the "Interlock" contactsin the junction box (see the attached ConnectionDiagrams for details). Ensure that the low water cutoffdevice(s) will function properly.