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TO TURN OFF THE ON DEMAND WATER HEATER ON DEMAND HEATER COMES ON AND RAPIDLY CYCLES ON AND 1. Turn switch to "OFF' position for units using the Switch and Light OFF: Assembly. 1. Water flaw is too low. Increase flow at faucet. 2. For units using the optional On Demand Control Center, press the 2. Clean all shower heads, faucet aerators or water strainers as power button once. required and remove any flow restrictions to ensure the minimum 3. Turn off electrical power to the appliance. 0.5 GPM of water flow. 3. Verify the water pump is functioning properly. 4. Turn off gas supply. 4. Bleed air out of plumbing lines by opening all water faucets. 5. If vehicle is to be stored or heater is going to be turned off while 5. If the On Demand water heater cycles as the pump cycles, an subject to freezing temperature, drain water heater. (See"Draining accumulator tank is needed in the water system. If accumulator and Storage Instructions.") tank is already installed, check for water inside the tank and drain tank until only air is present. SEQUENCE OF OPERATION 6. Water source pressure fluctuates too low causing loss of flow. The following Sequence of Operation will be the same when using Check the incoming water source for a minimum of 30 psi, either the ON/OFF SWITCH or the optional On Demand Control Center. 7 If using the standard ON/OFF Switch and Light, reset dip switches 1. Turning on a hot water faucet activates the On Demand Water back to factory setting of 120°F(see figure 12). If using the ON Heater. DEMAND CONTROL CENTER, decrease the set temperature 2. The flow sensor senses the flow of water. back to 120°F. 3. The pressure switch proves that the combustion air fan is working, WATER TEMPERATURE IS TOO LOW WITH LOWER WATER FLOW: 4. The combustion chamber is then purged of any remaining raw gas. 1. Waterflow .is too low. Increase flow at faucet to ensure the minimum 5. The burner will ignite and the electrode/Flame probe assembly 0.5 GPM of water flow. proves the flame. a. The approximate time from turning on the faucet to ignition is WATER TEMPERATURE IS TOO HIGH OR NO TEMPERATURE 7 seconds. After the initial lighting sequence and the water CONTROL: heater is maintaining temperature,the ignition cycle is reduced 1. For units with the Standard Switch and Light assembly, adjust the to approximately 5 seconds. dip switches to the desired temperature. Refer to OPERATING b. Burners will stay ON until the water flow is shut off. INSTRUCTIONS WITH SWITCH AND LIGHT ASSEMBLY and 6. The flow of hot water at the SET point begins approximately 3 see Figure 12 for information on setting dip switches to desired seconds after ignition but will not reach the faucet until the hot water temperature setting. lines leading to the faucet are cleared of any remaining water. This 2. For units using the optional On Demand Control Center, press time is determined by the length of the hot water line. the UP or DOWN arrows on the On Demand Control Center to 7. When the hot water faucet istumedOFF,thewater heater shuts down increase the SET water temperature in single increments. Refer and will remain at a read state until FF,th err is called fora air. to OPERATING INSTRUCTIONS WITH OPTIONAL ON DEMAND y g CONTROL CENTER and see Figure 13. NOTE: Blower motor will operate for approximately 20 seconds after the hot water faucet is turned OFF. LOW TEMPERATURE RISE AND EXCESSIVE WATER FLOW 8. If the ON/OFF SWITCH or On Demand Control Center are left in REQUIRED TO TRIGGER THE ON DEMAND WATER HEATER: the ON position, no further action is required by the user. NOTE: If you find that your water heater requires excessive flow to 9. If the water heater fails to light for any reason, a second Trial activate it (over 0.5 GPM), it is possible that you have COLD water For Ignition(TFI) will automatically begin. If the second Trial For bleeding into the HOT water side of your water system. Ignition(TFI) fails, the water heater will automatically begin a third 1. Verify that valves and faucets are closed when not in use. Check Trial For Ignition(TFI). If the third Trial For Ignition(TFI) fails, the the shower head for an ON/OFF button/lever and ensure it is in water heater will go into a lock out mode and will not try to light the the OFF position to prevent cold water from bleeding into the hot burner again.To reset: water system. This can keep the On Demand water heater from a. Using ON/OFF SWITCH:Turn Switch OFF then back ON. functioning correctly. b. Using the On Demand Control Center.Tum faucet OFF,then back 2. If your RV is equipped with a bypass valve at the water plumbing connection, make sure it is in the OFF position. An open valve can on. allow water to bypass water heater causing a failure to ignite. NOTE: The NAUTILUS (IW60) On Demand WATER HEATER has an energy mode circuit that will shut down operation if operating NO IGNITION: continuously for three(3)hours. To reset,follow the instruction in STEP If the burner will not come on,the following items should also be checked 9 A or B above. before calling a service technician: NOTE: Air in the gas line after changing propane tanks is the main A. Switch turned off. reason for not lighting the burner. A simple method to remove air from B. 12 VDC power is ON, the gas line is to ignite a burner on the installed cooking appliance C. Gas supply to heater is empty or turned off. inside your RV. D. Water turned on and faucet open. E. Check manual reset on ECO switch. Refer to DETAIL"A" in Figure 9. OPERATIONAL TROUBLESHOOTING If burner fails to light, call a Suburban service center or a local RV service agency. NOTE: There must be a demand of at least 0.5 GPM for the burner to operate and allow water flow. This will continue until the water flow is turned OFF and the system goes dormant. NO WATER FLOWS FROM FAUCET WHEN TURNED ON: 1. Be sure water supply is turned ON and there are no water restrictions. 2. Ensure BYPASS SYSTEM (if installed) is properly aligned for operation. BURNER TURNS ON,TEMPERATURE FLUCTUATES ERRATICALLY: 1. This issue can be caused by restriction in the shower heads,faucet aerators or water strainers. 2. Clean as required and remove any flow restrictions. 6