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Details for installing the heater using a flush mount frame and door.
Details for installing the heater using a hinged door for access.
Instructions for connecting water lines to the heater.
Instructions for connecting the gas supply line to the heater.
Adjustments needed for operating the water heater at high altitudes.
Procedures for making 12V DC and 120V AC electrical connections.
Routine checks and maintenance for the water heater.
General safety precautions and warnings for operation.
Explanation of the high-temperature limit and reset button.
Information on the tank's anode rod and its importance.
How to drain and store the water heater.
Step-by-step guide for operating the gas water heater.
Details of the extended warranty for the water heater tank.
This document serves as an installation and operation manual for a direct vent gas water heater manufactured by Suburban Manufacturing Company, a division of AIRXCEL, Inc. The manual covers models SW6DEL, SW10DEL, SW12DEL, and SW16DEL, designed for installation in recreational vehicles and mobile housing.
The primary function of this device is to provide hot water using gas as a fuel source. Some models also include an electric heating element for additional flexibility. The water heater is designed for direct venting, meaning combustion air is drawn from outside the vehicle, and exhaust gases are expelled directly to the outside, preventing the release of harmful flue products into the living space.
The water heater is equipped with an automatic ignition device, eliminating the need for a pilot light to be lit manually. To operate, users must ensure the tank is filled with water, and then turn on the gas supply and the electrical power to the appliance. The system will automatically attempt ignition. If the burner does not light on the first try, it will make two more attempts before locking out. Each ignition cycle includes a 15-second purge before the spark cycle. For electric operation, a dedicated switch inside the RV needs to be turned to the "ON" position. The water temperature is regulated by a non-adjustable thermostat, designed to maintain a water temperature of 130°F (54°C). A high-temperature limit acts as a cut-off device, tripping if the water temperature exceeds 180°F, requiring a manual reset.
Safety is a critical aspect of the water heater's design and operation. The manual emphasizes the importance of proper installation, warning against installing the vent where it could be obstructed by a door or under an overhang. It also provides clear instructions on what to do if a gas smell is detected, including not trying to light any appliance, not touching electrical switches, and immediately contacting the gas supplier or fire department. A freeze warning advises draining the heater if it will be subjected to freezing temperatures to prevent damage. The manual also highlights the risk of hydrogen gas accumulation if the heater has not been used for two weeks or more, recommending opening hot water faucets to vent the system before using any electrical appliances connected to the hot water system.
Water connections are made at the rear of the heater, with clearly marked "HOT" and "COLD" fittings. Inside each fitting is a plastic fill tube, which should not be removed as it enhances water circulation. A pipe thread compound suitable for potable water or pipe tape is recommended for all connections to prevent leaks. Gas connections are made to a 3/8" flare fitting at the gas valve, with a warning to hold the gas fitting with a wrench when tightening the flare nut to avoid damage and potential leaks. It's imperative to caulk the grommet and gas line where they pass through the control housing to ensure an airtight seal, preventing moisture and harmful flue products from entering the living area.
The water heater includes a temperature and pressure relief valve, designed to open if the water temperature reaches 210°F or if the water pressure reaches 150 pounds per square inch (PSI). This dripping is a normal occurrence in closed water systems due to water expansion during heating and does not indicate a defective valve. The manual provides a procedure to replenish the air pocket in the tank, which helps reduce the frequency of weeping from the relief valve.
Regular maintenance is crucial for the safe and efficient operation of the water heater. Users are advised to periodically inspect the main burner flame for a yellow or erratic pattern, which indicates improper combustion and potential sooting. If soot is present anywhere on the water heater, the unit should be shut down, and a qualified service person contacted. Areas to check for soot include the burner, flue box, and the screen in the door, which should be free of foreign material to ensure proper airflow. The grommet on the gas inlet should also be checked frequently to ensure a tight seal. All wiring and connections should be inspected for damage, fraying, and tightness.
The tank is protected by a magnesium or aluminum anode rod, which absorbs the corrosive action of hot water to prolong the tank's life. This anode rod is designed to deteriorate over time and should be replaced yearly, or more frequently in areas with high levels of iron and/or sulfate in the water. Operating the water heater without proper anode protection will decrease tank life and void the warranty. The manual explicitly warns against replacing the anode rod with non-Suburban accessory parts, such as "add-on" electric heating elements, as these are not approved and can create unsafe conditions and void warranties.
For storage, especially during winter months, the water heater must be drained to prevent freezing damage. This involves turning off electrical power and gas supply, opening hot and cold water faucets, and removing the anode rod from the tank. If the RV's plumbing system has a bypass kit, the water heater should be bypassed and drained completely before introducing antifreeze into the system, as antifreeze can be corrosive to the anode rod.
The manual also addresses high altitude deration, noting that the water heaters are certified for operation up to 4,500 feet without modifications. Above this elevation, derating by 4 percent for every 1,000 feet above sea level may be required to prevent improper burner operation, pilot outage, sooting, and reduced heating efficiency. This deration typically involves changing the orifice and should be performed by a dealer or qualified service person.
Finally, the manual includes a section on addressing odors from the hot water system, often referred to as "sulfur water." This is not a service problem but an unpleasant smell caused by chemical action or bacteria. The recommended solution is chlorination of the water system using household liquid bleach, followed by flushing with fresh water. If the odor persists, replacing the anode rod may be necessary.
General| Capacity | 16 gallons |
|---|---|
| Voltage | 120V AC |
| Dimensions | 16.5 x 16.5 x 20.5 inches |
| Weight | 38 lbs |
| Voltage (DC) | 12V DC |
| Tank Capacity | 16 gallons |
| Ignition | Electronic |
| Fuel Type | Propane |
| Ignition Type | Direct Spark |
| Venting | Direct Vent |
| BTU/h (LP) | 12, 000 BTU/h |
| Input BTU | 12, 000 BTU/hr |
| Recovery Rate | 10.5 gallons/hour |
