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When away for extended periods of time such as vacation, and no freezing temperatures are expected: . 15 . 1. Shut off the oil supply at the tank. 2. Shut off the cold water supply to the heater. 3. Turn "OFF" the electrical supply to the water heater. 4. Open an upstairs hot water faucet (to relieve any pressure). When freezing temperatures are expected: NOTE: It is recommended that all water lines in the home be drained. Contact a qualified plumber for directions applicable to the heater. 1. Shut off the oil supply at the tank. 2. Shut off the cold water supply to the heater. 3. Turn "OFF" the electrical supply to the water heater. 4. Connect a hose to the drain valve and drain as directed in .Draining, Flushing and Sediment Removal.. 5. Leave the drain hose attached as a reminder that the tank has no water in it. Re-Starting The Heater After Shut-Dow. CAUTIO. Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally two (2) weeks or more). Hydrogen gas is extremely flammable and can ignite when exposed to a spark or flame. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. Use caution in opening faucets. When hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. There should be no smoking or open flame near the faucet at the time it is open. 1. Follow instructions for .Filling the Water Heater. and .Startup. when heater is ready to be put back into service. 2. If the heater does not start, check to see if the relay on the burner has tripped. Reset if necessary. Check to see if the thermostat is set at .Normal. or .High.. 3. If the heater does not start: a) Turn "OFF" the electrical supply to the water heater. b) Shut off the oil supply at the tank. c) Call a qualified Oil-Burner Technician. VI. COMBINATION HEATIN. Combination Potable Water Heating an. Space Heating (Combo. This section serves as a guide for the installation and use of .Combo. heating systems utilizing a domestic water heater which has been specifically approved for such use. It is written for those knowledgeable in the required trades and professionals involved in the design and installation of Combo Heating Systems. It is the responsibility of the installer/ designer to follow all applicable codes to ensure the effectiveness and safety of the installation. CAUTION. READ BEFORE PROCEEDING The following requirements must be met for the installation of Combo Heating Systems: 1. All components used for the distribution of water in the heating loop must be suitable for potable water. These include all piping, fittings, solder and fluxes, pumps for circulation of water, valves, etc. 2. The water heater must not be connected to a hydronic heating system that has been used previously. 3. No boiler treatment chemicals of any kind shall be introduced into the system. 4. The Combo System components must be selected and sized to meet and maintain the total calculated demands for both domestic service hot water and space heating requirement. The sizing and installation must be performed in accordance with good engineering practice such as ASHRAE Handbooks, HRAI, Hydronics Institute Manuals, CGA B149, NFPA 54, ANSI Z223.1, CSA F280, National/Provincial Building Codes, CSA C22.1, ANSI/NFPA 70, CSA B51 and/or codes having jurisdiction. 5. The air handler (fan coil) and/or the circulating pump in a heating loop will require a dedicated 120V circuit. This must be provided and identified for this purpose. 6. All piping between the water heater and the air handler or heating loop must be adequately insulated to reduce heat loss. 7. If the local jurisdiction requires a back-flow preventer in the cold water line, an expansion tank of adequate size must be installed. 8. To reduce the scald hazard potential, a mixing valve must be installed. Installatio. The heating mode may be one of the following options: 1. A fan coil/air handler (Figure 14). 2. A hydronic baseboard (finned tube) loop (Figure 15). 3. A hydronic in-floor heating loop (Figure 16). In order to connect a heating loop to the water heater you must: 1. Install shut-off valves and unions so that the water heater can be isolated from the heating module should servicing of the water heater become necessary. 2. Install a drain valve at the lowest point of the heating loop so that water can be drained from the heating module without affecting the water heater. • If the air handler does not have a venting means, install an air bleed at the highest point of the plumbing arrangement. • If solenoid valves are used for zone heating applications, they must include electrical proof of valve full open position and must be connected to the water pump. . 16 . HOT WATER TO HOUSE COLD SUPPLY HOT WATER ...

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