Raypak XFyre 300A Installation & Operating Instructions Manual

Flow SwitchThis standard, dual-purpose control shuts off the boil-er in case of pump failure or low water flow. The flowswitch ships mounted and wired.Fig. 33: Low Water Cut-OffFlue Temperature LimitThe heater is equipped with a fixed setting manualreset high limit temperature device on the vent, for usewith non-metallic vent material. The high temperaturelimit is located inside the unit near the vent adapter.The VERSA monitors the limit and displays any faultassociated with the limit on the user interface. To resetthe limit, access it and press down on the red button.The unit is provided with a limit rated for PVC ventmaterial. A higher rated limit is provided when usingCentrotherm™ polypropylene venting. The limit isremoved when using Category IV stainless steel vent-ing.Low Water Cut-Off (Optional)The optional low water cut-off automatically shutsdown the burner whenever water level drops below thelevel of the sensing probe. A 5-second time delay pre-vents premature lockout due to temporary conditionssuch as power fluctuations or air pockets.Fig. 31: Flow SwitchFig. 32: Flue Temperature LimitHigh & Low Gas Pressure Switches(Optional)The optional low gas pressure switch connectionmounts upstream of the gas valve (on the inlet flangeto the gas valve) and is accessible through the remov-able access panels on the front or top of the boiler toreset the gas pressure switch, as necessary. It is usedto ensure that sufficient gas pressure is present forproper valve/regulator performance. The low gas pres-sure switch automatically shuts down the boiler if thegas supply drops below the factory setting of 3.0 in.WC for natural gas or propane gas.The optional high gas pressure switch connectionmounts down-stream of the gas valve. Special portsare located on the backside of the gas valve and areaccessible from the front or top of the boiler (to resetthe gas pressure switch), as necessary. If the gaspressure regulator in the valve fails, the high gas pres-sure switch automatically shuts down the burner.Operation of either the High or Low Gas PressureSwitch will turn on an LED inside the switch housing.Push the top of the plastic switch housing as shown inFig. 34 to reset a tripped pressure switch. The LED willgo out when the switch is reset.36