I&O Manual - Solaris Water Heaters - Categories On Thermal ...

O. Check the pilot and main burner flames. Allow thewater heater to complete pre-purge, PTFI, and MTFI.Look through the water heater sight glass and check thepilot and main burner flames. For the pilot and mainburner flame, confirm that the flame signal is between1.5 and 5.0 volts DC. Reference Figure 26 for flame appearance.The flames should have a clearly defined innercone with no yellow tipping. Orange-yellow streaksshould not be confused with true yellow tipping. If theflames do not meet the criteria in Figure 26, adjust thegas valve settings as described in step R.WARNINGFailure to properly adjust gas input rate willresult in over firing or under firing of the appliance.Improper and unsafe water heateroperation may result.P. Check low water cut-off (if so equipped).1. Adjust setpoint to highest setting.2. With water heater operating, open the drainvalve and slowly drain the water heater.3. Main burners and pilot burner will extinguish andblower will stop when the water level drops belowthe low water cutoff probe. Verify limit, thermostator other controls have not shut off the water heater.4. Adjust the setpoint to the desired value and refillthe water heater.Q. Verify that all safety and operating limits are operatingproperly. These controls and limits include differentialair switch, water temperature operating control,manual reset water temperature safety limit, and thehigh and low gas pressure switches (if provided). Referto the individual manuals, provided with the waterheater, for these components to obtain proper startupand operating instructions. Follow all instructionscontained in these manuals. Refer to section IX to viewa description of the safety and operating controls.R. Adjust the gas input rate to the water heater.1. Administer a call for heat and allow the waterheater to operate.2. Check the manifold pressure at high fire and lowfire. See table 3 or the rating label located in thewater heater’s vestibule compartment.a. Connect manometer to pressure tappingdownstream V1 on main gas valve. See item 8 onFigure 28.b. Use the V setting (Item 10 on Figure 28) onthe main gas valve to adjust the gas manifoldpressure at high fire. Turn the screw settingclockwise to increase and counterclockwise todecrease the manifold pressure.c. Use the N setting (Item 9 on Figure 28) on themain gas valve to adjust the gas manifold pressureat low fire. Turn the screw setting clockwiseto increase counterclockwise to decrease themanifold pressure.3. Clock the gas meter for at least 30 seconds. UseTable 7 to determine the gas flow rate in cubic feetper hour.4. Determine the input rate. Multiply the gas flow rateby the gas heating value.5. Compare the measured input rate to the input ratestated on the rating plate.a. The water heater must not be over fired. Reducethe input rate by decreasing the manifold pressureas described in step R. Do not reduce morethan 0.3 inch w.c. If the water heater is still overfired, contact your Thermal Solutions representative.b. If the measured value is less than 98% of therating plate input, increase the input rate byincreasing the manifold gas pressure describedin step R. Do not increase the manifold pressuremore than 0.3 inch w.c. Contact your ThermalSolutions representative if the measured rate isstill less than 98% of the rated input.WARNINGFailure to properly adjust excess air willresult in unsafe levels of carbon monoxide.Variations in venting or combustion air pressureand temperature will change excessair. Adjust excess air levels so that variationin venting or combustion air pressures andtemperatures caused by change of seasons,wind conditions, opening or closingof water heater room doors or windows donot cause the water heater to operate withcarbon monoxide concentrations above 400parts per million.6. Measure the percent oxygen (%O2), the carbonmonoxide concentrations in the flue gas (CO ppm),and the flue gas temperature. Compare the resultswith the values given on the factory fire test reportsupplied with the water heater.7. Return gas fired appliances to previous conditions ofuse.S. Review user’s information manual and system operationwith owner or operator.