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Details on connecting the 12 Volt D.C. electrical system for the unit.
Instructions for connecting hot and cold water lines to the unit.
Guidance on installing the ON/OFF switch and indicator light.
Essential safety precautions before operating the water heater.
Step-by-step process of how the water heater functions when activated.
Procedure for removing mineral deposits to maintain heat exchanger efficiency.
Details on the function and safety of the temperature and pressure relief valve.
Information on obtaining replacement parts and contacting authorized service centers.
This manual describes the installation and operation of the Nautilus On Demand Water Heater (IW60) Direct Vent Gas with Direct Spark Ignition, designed for recreational vehicles. This appliance provides on-demand hot water, offering a continuous supply as needed, unlike traditional tank-style water heaters. Its direct vent design ensures that combustion air is drawn from outside the vehicle and exhaust gases are vented directly outside, enhancing safety by preventing the release of combustion byproducts into the occupied space. The direct spark ignition system eliminates the need for a pilot light, providing efficient and automatic ignition of the burner when hot water is called for.
The water heater is equipped with several usage features to enhance convenience and safety. It operates based on water flow, meaning the burner will only ignite when a hot water faucet is opened and a minimum flow rate of 0.5 GPM (1.9 LPM) is detected. This flow-activated operation ensures that energy is only consumed when hot water is actively being used, contributing to energy efficiency. The unit's thermostat is factory-set to maintain a water temperature of 120°F (49°C), a common temperature for household use. However, users have the option to adjust this temperature setting. For units with the standard switch and light assembly, temperature adjustments are made via dip switches located on the module board, accessible by removing the service panel. For units equipped with the optional On Demand Control Center, temperature can be adjusted more conveniently using UP or DOWN arrows on the control panel, with a setting range of 95°F (35°C) to 130°F (54°C). The control center also displays the current water temperature and provides status indicators for burner operation, blower activity, and freeze protection.
A key safety feature is the integrated freeze protection mechanism. When the ambient temperature falls below 40°F (4.4°C), the burner will intermittently cycle to prevent the water in the heater from freezing. This feature requires the gas supply to be on and electrical power to be available. The unit also includes an automatic gas valve that shuts off the gas supply if overheating occurs or if the flame is not proven, preventing potential hazards. In case of a lockout, where the burner fails to ignite after multiple attempts, the system will enter a lockout mode, indicated by a light on the standard switch assembly or an error code on the optional control center. The unit can be reset by cycling the hot water faucet or the ON/OFF switch.
The manual emphasizes several maintenance features and safety precautions. Regular inspection of the vent for obstructions or soot is crucial. Soot indicates incomplete combustion, which is an unsafe condition that requires immediate attention from a qualified service technician. The vent cap must always be in place for proper operation. Users are warned against altering the water heater's operation or design, and only factory-authorized parts should be used for repairs. Periodically checking wiring and connections for damage or looseness is also recommended to ensure compliance with electrical codes.
For winter storage or when the vehicle is subject to freezing temperatures, the water heater system must be drained to prevent damage. The manual provides detailed instructions for draining the system, including turning off electrical power and gas supply, opening faucets, and draining through the system drain valve. It also advises following the RV manufacturer's instructions for draining the entire water system and, if recommended, adding RV non-toxic antifreeze. The temperature and pressure relief valve is a critical safety component designed to open if the water temperature or pressure exceeds safe limits (210°F or 145 psi, respectively). Users are strictly warned not to place any valve between the relief valve and the unit or to plug the relief valve under any circumstances.
Descaling the heat exchanger annually with an approved descaling solution is recommended to maintain efficiency and prolong the life of the unit. The manual also provides troubleshooting tips for common issues such as no water flow, erratic temperature fluctuations, or the unit cycling on and off rapidly. These tips often point to issues like low water flow, obstructions in showerheads or faucets, or problems with the RV's water pump or accumulator tank. For any repairs or maintenance, the manual strongly advises contacting a qualified installer, service agency, or gas supplier, as improper servicing can lead to serious injury or death. The manual includes contact information for the manufacturer's service division for assistance with parts and service.
General| Fuel Type | Propane |
|---|---|
| Heating Capacity | 60, 000 BTU/h |
| BTU/h Input | 60, 000 BTU/h |
| Tank Capacity | Tankless |
| Ignition Type | Electronic Ignition |
| Vent Type | Direct Vent |
| Thermostat | Adjustable |
| Type | Tankless Water Heater |
| Gas Type | Propane |
| Water Connections | 1/2 inch NPT |
| Warranty | 2 Years Limited Warranty |
