Raypak Hi Delta 302A-902A Installation And Operating Instructions Manual

37The optional single-try ignition module will lock outafter failing to light one time. To reset it, press andrelease the small, recessed black push button locatedinside of the cut-out on the lower right-hand corner ofthe ignition module case. Turning off the power to theheater WILL NOT reset the ignition module.High Limit (Manual Reset)The heater is equipped with a manual reset high limittemperature device. Push the reset button and adjustthe setting to 40 - 50°F above desired operating tem-perature.Flow SwitchThis dual-purpose control, mounted and wired inseries with the main gas valve, shuts off heater in caseof pump failure or low water flow.Operating ControlThe heater may be equipped with different types ofoperating controls. Consult the individual control datasheets supplied with your heater paperwork. See theFig. 30: High Limit (Manual Reset)Fig. 31: Flow SwitchFig. 32: Operating ControlLow Water Cut-Off (Optional)The low water cut-off automatically shuts down theburner whenever water level drops below the level ofthe sensing probe. A 5-second time delay preventspremature lockout due to temporary conditions suchas power fluctuations or air pockets.Fig. 33: Low Water Cut-OffHigh and Low Gas Pressure SwitchesThe low gas pressure switch (standard) connectionmounts upstream of the gas valve to ensure that suffi-cient gas pressure is present for proper regulator per-formance. The low gas pressure switch automaticallyshuts down the heater if gas supply drops below thefactory setting of 5.0 in. WC for natural gas, and 10.0in. WC for propane gas.The high gas pressure switch (optional) connectionmounts down-stream of the stage-1 gas valve. If thegas pressure regulator fails, the high gas pressureswitch automatically shuts down the burner.General Safety Section for safety precautions con-cerning domestic hot water applications.