Bradford-White Corp 500-1825 warranty To Start Up System, Hi-Limit Checkout, Start Up Heater

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B4 Volume Water Heater Page 15

2.Make sure the heater’s power switch is in the “ON” position. After placing the manual pilot gas valve in the open position and resetting all safety devices, (high limit, pressure switch, low- water cutoff, etc.) pilot(s) can be lit following the procedure located on the heater rating plate.

3.Once the pilot(s) is lit and has been established for five minutes, the flame failure response time should be checked as follows:

System 9 - (Intermittent ignition): With this system pilots are automatically lit when the operating controls call for heat. If the pilot flame fails for any reason, the main valve is shut off within one second and the pilot spark ignition is initiated until the pilot flame has been reestablished. On propane systems, unit locks out for safety. This sequence should be checked by turning off the manual pilot gas valve, and, at the same time, monitoring the audible sparking at the pilot burner and signal interruption to the main valve.

Caution

Propane gas is heavier than air and sinks to the ground. Exercise extreme care in lighting the heater when so equipped.

System 16 - (Electronically supervised standing pilot system): Extinguish the pilot flame by placing the manual pilot valve in the closed position, and at the same time, begin recording the time it takes for the output signal from the electronic ignition control to be interrupted. The signal interruption can be detected either with a test light or a voltmeter. The response time should never exceed one second.

4.With the pilots lit, initial activation of the main burners can be achieved by slowly opening the main manual valve. The result should be a smooth 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 the heater shuts off. The main burners should reignite when the hi-limit is reset and turned back up to its original setting. The heater should now run until it shuts off automatically on operating aquastat.

3.3 To Start Up System:

3.3.1 Start Up Heater

Be certain system pump is running, then proceed as follows:

1.Turn off main electrical switch.

2.Turn off all manual gas valves and wait five minutes (see Figure 16).

3.Set operating control to lowest setting.

4.Slowly turn manual gas valve to “ON”.

			ON POSITION
			Pilot Valve	ON
	ON			OFF
				ON
				OFF
				Main Gas Valve
	ON
			Pilot Valve
	OFF
ON		ON	OFF POSITION
	Main Gas Valve

Figure 16. Gas Manual Valves.

5.Reset all safety valve switches (manual reset high limit and low water cut off).

6.Open manual pilot valve. Turn on main electrical switch.

7.Set temperature controller to desired temperature. Pilot will light automatically to ignite main burners whenever the aquastat calls for heat.

For standing pilot system, press on pilot relay knob, see Figure 17, light pilot and keep relay knob depressed for one minute then release. Once the pilot is lit, the power is supplied through the aquastat to the main gas valve.

3.3.2 To set the temperature and high- limit controls:

When using a tank aquastat:

Set the tank aquastat to the desired tank temperature. Set the heater temperature control 20°F higher than tank aquastat. Set the manual reset high limit 50°F higher than tank aquastat. Example: If desired temperature is 140°F, set the tank aquastat at 140°F, set the heater temperature control at 160°F, and set the manual reset high limit at 190°F. If the heater is equipped with a pump time delay, the three-position switch on the side of the heater can be put into the “Auto Pump” position, so that the pump will only run when the tank aquastat calls for heat. Then, when the call for heat is satisfied, the heater will turn off, but the pump will run for the set amount of delay time (adjustable between 0.1 and 10 minutes).