RBI Dominator Series Installation & Operating Instructions Manual

RBI Dominator Series Installation & Operating Instructions Manual Manual pdf 30 page image

Fi d b b il & h B il M lFinned copper tube gas boilers & water heaters – Boiler Manual30FFCHECKING & ADJUSTMENTS1. With the burners in operation, close the manual shutoff valve inthe gas supply line. As soon as the main burner flames go out,open the manual shutoffvalve. A normal ignition sequence shouldtake place. If the burners fail to light, the gas valves will close andthe system will go into a 5-minute lock out period. The ignitionmodule will then make a second ignition attempt. If the unit won'tlight ensure that the gas piping is fully purged of air. Inspect theignition system and ensure that it is operating properly.2. To test the ignition safety shutoff device, close the manual shutoffvalve in the gas supply line. Within 5 seconds of main burnerflame extinction, the main gas valve solenoid should close withan audible noise.The pilot light on the display board should be litwhile the ignition module tries to relight the pilot. After 10seconds the module should lockout and the trial for ignition end.After 5 minutes a second trial for ignition should occur. Open themanual shutoff valve in the gas supply line and reset the ignitioncontrol system. A normal ignition sequence should take place.3. With the burners in operation, interrupt the power to the controlcircuit by reducing the target temperature of the staging controlleror turning down the thermostat. The boiler/water heater shouldstage down and shut down. Reset the operating control or thermo-stat. A normal ignition sequence should follow.Input Rate, Natural GasGas appliances are rated based on sea level operation with noadjustment required at elevations up to 5000 ft, 1524 m. At elevationsabove 5000 ft, 1524 m, input ratings should be reduced by 4% foreach additional 1000 ft, 305 m.Check the input rate as follows:1. Turn off all other gas appliances that use the same gas meter asthe boiler/water heater.2. Call your gas supplier and ask for the heating value of the gas.3. Connect a flue gas analyzer to the vent pipe.4. Start the boiler/water heater and let it run for 15 minutes.5. Using the gas meter and a stopwatch, clock the time that it takesto burn 10 ft3, 0.28 m 3 of gas and divide this time by 10.6. Insert the heating value and the time, in seconds, into the formulabelow.7. Input = (heating value, Btu/hr)(3600)/(time, seconds)8. If the computed rate deviates by more than 5% from the ratedinput value of the unit adjust the manifold pressure accordingly.DO NOT adjust the manifold pressure by more than 5%. If aproper rate cannot be maintained without adjusting the manifoldpressure beyond the 5% limit, the main burner orifices must bereplaced. If the input rate is too low, go to the next larger size ofmain burner orifices. If the input rate is too high, go to the nextsmaller size.9. At full input the CO2 should be between 7.5% and 8.5%with a CO reading of less than 50 ppm. See Table 20.Never increase the input of the boiler/water heaterabove that for which it is rated. Doing so can causepremature failure of the unit!Pilot AdjustmentThe pilot burner is actually an isolated main burner thatstages with the other burners. It is controlled by a separate pilotvalve. Pilot pressure settings are as shown in Table 19. These pressuresare measured at the pilot pressure valve, see Figure 19. See Tables12 and 13 to determine the fi ring mode that is associated with eachstage.To view the pilot without main burner operation, take the followingsteps:For D300-D400:1. Remove the upper front jacket panel.2. Turn off main burner gas flow by turning the main burner gasvalve knob to the off position, Figure 18.3. Observe the pilot flame through the observation port locatedat the left end of the unit.For D600-D2100:1. Remove the upper front jacket panel.2. Turn off main burner gas fl ow by turning the manual gas valve(s)in the control compartment to the off position, see Figure 19.3. Observe the pilot flame through the observation port locatedat the left end of the unit.Pilot pressures will be set at the factory. However, if it is necessaryto adjust the pilot pressure to match those in Table 19, take thefollowing steps:1. Remove the upper front jacket panel.2. Remove the 1/8" plug from the pilot pressure test port andconnect a 20 in, 508 mm W.C. manometer to it, see Figure 18.3. Remove the gas pressure regulator cap from the pilot valve. SeeFigure 18 for the location of the regulator and cap.4. Use a 3/32 hex wrench to turn the pressure regulator adjustmentscrew clockwise to increase the pilot pressure and counterclockwiseto decrease it.5. Replace the pressure regulator adjustment screw cap.Gas Pressure AdjustmentThe maximum inlet gas pressure listed on the ratingplate must not be exceeded or damage to the boiler/water heater may occur voiding the warranty!The minimum supply pressure listed on the rating plate is for inputadjustment.