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MAINTENANCE A. Periodically inspect unit for soot. If soot is present anywhere on water heater, immediately shut unit down. Soot is a sign of incomplete combustion and must be corrected before operating water heater.Areas to check would include: 1. Check for an obstruction in vent cap. 2. Check vent to see that no foreign material has accumulated to prevent flow of combustion and ventilating air. 3. Check to be sure there is no flame present at burner orifice or burner whenever main gas valve is closed. This can be checked by turning the ON/OFF switch to the"OFF"position. B. Periodically check wiring and wire connections to be sure wiring is not damaged/frayed and that all terminals and connections are tight and in compliance with codes (See "Making Electrical Connections"). INCORRECT DRAINING AND STORAGE INSTRUCTIONS Enlarged for Illustrator,purposes only If RV is to be stored during winter months,the water heater system must Figure t be drained to prevent damage from freezing. 1. Turn off electrical power to water heater either using the switch,the On Demand Control Center or by removing the fuse. 2. Shut off gas supply to water heater. 3. Tum off pressure pump on water system. 4. Open both hot and cold water faucets. 5. Remove Service Panel to access system drain valve. 6. Turn drain valve knob clockwise to drain. 7. Follow RV manufacturer's instructions fordraining entire watersystem. NOTE: System will have to be refilled with water and all air removed from lines before unit will re-light. NOTE: All water must be drained to the outside of the RV- Drain lines must be connected to the system and condensation drains on the water heater and ran to the outside of the RV. Drain lines should be as short as possible and must maintain a drop of W per foot from unit. See Figure 10. WINTERIZING 1. Follow RV manufacturers instructions for draining entire water system. ,- 2. Once drained, RV NON-TOXIC antifreeze can be added if recommended by your coach manufacturer. FREEZE PROTECTION The NAUTILUS (IW60) On Demand water heater has built-in FREEZE INCORRECT PROTECTION and will intermittently cycle the burner when the water Enlarged for illustration purposes only temperature has fallen below 40°F(4.4°C). This intermittent cycling will Figure 2 continue until the water temperature has risen above 50°F(10.0°C). To provide this freeze protection, gas and electrical must be turned on. If the On Demand Water Heater is dripping water into the drain line, in cold weather, when the water supply temperature is below 38°F and does not stop when the water temperature rises above 38°F, call your local service center. The valve may be disabled by turning the needle valve located on the front of the On Demand Water Heater 6 and 1/2 turns clockwise. Closing the valve will disable the mechanical freeze protection feature. The water system must be drained when not in use to avoid damage caused by ice expanding in water lines if valve is closed. DESCALING INFORMATION Each year, drain the water from the system and flush the heat exchanger using Suburban's authorized decalcification kit. To order this. decalcification kit,please contact your preferred distributor and order Kit Number 521163. PRESSURE RELIEF VALVE The temperature and pressure relief valve is designed to open if the temperature of the water within the heater reaches 21 TF,or if the water pressure in the heater reaches 145 psi. CORRECT Enlarged for i0ustnuion purposes only Suburban recommends that a check valve not be installed directly at the Figure a inlet to the water heating unit. 7