Natco VW Installation And Operating Instructions Manual
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Contents
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19cutoff, etc.) pilot(s) can be lit following theprocedure located on the heater rating plate.3. Once the pilot(s) is lit and has been establishedfor five minutes, the flame failure response timeshould be checked as follows:Systems 4 and 9 - (Intermittent ignition), natural gasonly: With this system pilots are automatically litwhen the operating controls call for heat. If the pilotflame fails for any reason, the main valve is shut offwithin one second and the pilot spark ignition isinitiated until the pilot flame has been reestablished.This sequence should be checked by turning off themanual pilot gas valve, and, at the same time,monitoring the audible sparking at the pilot burner andsignal interruption to the main valve.CAUTION: Propane gas is heavier than air and sinksto the ground. Exercise extreme care in lighting theheater when so equipped.System 16 - (Electronically supervised standing pilotsystem), standard on propane gas: Extinguish thepilot flame by placing the manual pilot valve in theclosed position, and at the same time, begin recordingthe time it takes for the output signal from theelectronic ignition control to be interrupted. The signalinter- ruption can be detected either with a test light ora voltmeter. The response time should never exceedone second.4. With the pilots lit, initial activation of the mainburners can be achieved by slowly opening themain manual valve. The result should be asmooth lighting of the main burners.Hi-Limit Checkout:After running the heater for a long enough period,bring the water temperature within the range of the hi-limit and slowly back off the high limit setting until theheater shuts off. The main burners should reignitewhen the hi-limit is reset and turned back up to itsoriginal setting. The heater should now run until itshuts off automatically on operating aquastat.3C. To Start Up System:1. Start Up BoilerBe certain system pump is running, thenproceed as follows:a. Turn off main electrical switch.b. Turn off all manual gas valves and wait fiveminutes. (Figure 21)Figure 21 – Gas Manual Valvesc. Set operating control to lowest setting.d. Slowly turn manual gas valve to “ON”.e. Reset all safety valve switches (manual resethigh limit and low water cut off).f. Open manual pilot valve. Turn on mainelectrical switch.g. Set temperature controller to desiredtemperature. Pilot will light automatically toignite main burners whenever the aquastatcalls for heat.For standing pilot system, press on pilot relayknob, see Figure 22, light pilot and keep relayknob depressed for one minute then release.Once the pilot is lit, the power is supplied throughthe aquastat to the main gas valve.2. To set the temperature and high-limitcontrols:a. Set the temperature controller at the systemdesign temperature.Pilot ValveON POSITIONONONOFFOFFONONOFFONONOFF POSITIONMain Gas ValveMain Gas ValvePilot Valve |
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