Raypak XTherm 1005A Installation And Operation Manual

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40R/Y BK/YGWBK1 2 3OFFON1 - ON2 - OFF3 - OFFFigure 47. Injector Pump DIP Switches, and Wiring4.5. Condensate Float SwitchThis heater is equipped with a condensate float switch toprevent operation when the condensate water level is toohigh. The heater shutting down from the condensate floatswitch is indicative of a blocked drain or problem with thecondensate management system. The condensate floatswitch is located inside the vent outlet plenum at the leftrear of the heater.Figure 48. Condensate Float Switch4.6. Flow SwitchThis standard, dual-purpose control shuts off the heater incase of pump failure or low water flow through the primaryloop.Figure 49. Flow SwitchNOTE: The wiring diagrams in this manual show allstandard options. Refer to the large wiring diagramprovided with your heater for options installed on yourspecific unit(s).4.7. Low Water Cut-Off (Optional)The optional low water cut-off (sales option F-10)automatically shuts down the burner whenever thewater level drops below the level of the sensing probe. A5-second time delay prevents premature lockout due totemporary conditions such as power fluctuations or airpockets.Figure 50. Low Water Cut-Off Board4.8. High and Low GasPressure Switches (Optional)The low gas pressure switch (sales option S-1) mountsupstream of the gas valve (on the inlet flange to the gasvalve) and is accessible through the removable accesspanels on the side or front of the heater to reset the gaspressure switch, as necessary. It is used to ensure thatsufficient gas pressure is present for proper valve/regulatorperformance. The low gas pressure switch automaticallyshuts down the heater if gas supply drops below thefactory setting of 3" WC for natural gas or propane gas.The high gas pressure switch (sales option S-2) connectionmounts down-stream of the gas valve and automaticallyshots down the heater if the gas pressure to the burnerrises above 3" WC for nat or pro. Special ports are locatedon the backside of the gas valve and accessible from thefront of the heater (to reset the gas pressure switch) orthrough the removable access panels on the rear of theheater (to reset the gas pressure switch), as necessary. Ifthe gas pressure regulator in the valve fails, the high gaspressure switch automatically shuts down the burner.Operation of either the High or Low Gas Pressure Switchwill turn on an LED inside the switch housing. Push thetop of the plastic switch housing as shown in Figure 51 toreset a tripped pressure switch. The LED will go out whenthe switch is reset.These safety devices will emit small amounts of fuel gas,and must be piped to a safe discharge location outdoors,per local code requirements.Figure 51. High/Low Gas Pressure Switch