!WARNING
The manufacturer’s warranty does not cover any damage or defect caused by installation, or attachment, or use of any special attach- ment such as energy saving devices (other than those authorized by the manufacturer) into, onto, or in conjunction with the water heater. The use of such unauthorized devices may shorten the life of the water heater and may endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from the use of such unauthorized devices.
1.INSPECT SHIPMENT — for possible damage. The manufacturer’s responsibility ceases upon delivery of goods to the carrier in good condition. Any claims for damage, shortage in shipments, or non de- livery must be filed immediately against carrier by consignee.
2.THERMAL EXPANSION — Determine if a check valve exists in the inlet water line. It may have been installed in the cold water line as a separate back flow preventer, or it may be part of a pressure reduc- ing valve, water meter or water softener. A check valve located in the cold water inlet line can cause what is referred to as a ”closed water system”. A cold water inlet line with no check valve or back flow prevention device is referred to as an ”open” water system.
As water is heated, it expands in volume and creates an increase in the pressure within the water system. This action is referred to as ”thermal expansion”. In an ”open” water system, expanding water which exceeds the capacity of the water heater flows back into the city main where the pressure is easily dissipated.
A ”closed water system”, however, prevents the expanding water from flowing back into the main supply line, and the result of ”thermal expansion” can create a rapid, and dangerous pressure increase in the water heater and system piping. This rapid pressure increase can quickly reach the safety setting of the relief valve, causing it to oper- ate during each heating cycle. Thermal expansion, and the resulting rapid, and repeated expansion and contraction of components in the water heater and piping system can cause premature failure of the relief valve, and possibly the heater itself. Replacing the relief valve will not correct the problem!
The suggested method of controlling thermal expansion is to install an expansion tank in the cold water line between the water heater and the check valve. The expansion tank is designed with an air cushion built in that compresses as the system pressure increases, thereby relieving the over pressure condition and eliminating the repeated operation of the relief valve. Other methods of controlling thermal expansion are also available. Contact your installing contractor, water supplier, or plumbing inspector for additional information regarding this subject.
If a recirculation line is installed, the return connection should be made to a tee close to the inlet connection on the water heater. A check valve should always be installed in the recirculation line to prevent cold water from entering.
WATER CONNECTIONS — This water heater may be connected indi- vidually, in multiples with others, or with an external hot water storage tank.
Inlet water connections are made to the lower coupling on the heater, and outlet water connections are made to the upper coupling.
Each water heater is supplied with the necessary components (Diffuser tubes) to make the water connections that will ensure proper perfor- mance. The components are supplied in a bag attached to the water
heater. If special instructions are required for any specific water heater, they will be included in the bag.
Cap or plug unused connections. Use only clean, new galvanized steel, copper or approved plastic pipe for water connections. Local codes or regulations shall govern the exact type of material to be used. The installation of unions on the inlet and outlet water lines and a shut-off valve in at least the cold water inlet line is recommended, so the water heater may be easily disconnected for servicing. Dielectric unions are not required for protection of water heater.
When this water heater is supplying general purpose hot water require- ments for use by individuals, a thermostatically controlled mixing valve is recommended to reduce the risk of scald injury. Contact a licensed plumber or the local plumbing authority for further information.
Thermometer(s) should be installed so that they indicate the tempera- ture of the water at or near the outlet of the water heater and storage tank(s) if provided. See Fig. 4 on page 7.
3.RELIEF VALVE — A new factory installed combination pressure and temperature relief valve, complying with the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22, or Standard CAN1-4.4, Temperature, Pressure, Tempera- ture and Pressure Relief Valves and Vacuum Relief Valves is provided with the water heater. No valve is to be placed between the relief valve and the water heater. For a circulating tank installation, the separate storage tank(s) must have similar protection. The pressure rating of the relief valve must not exceed 150 psi (160 psi for ASME models), the maximum working pressure as marked on front of the water heater.
The Btu/h rating of the relief valve must equal or exceed the Btu/h input of the water heater as marked on its rating plate.
Connect the outlet of the relief valve to a suitable open drain. The discharge line must pitch downward from the valve to allow complete draining (by gravity) of the relief valve and discharge line, and be no smaller than the outlet of the valve. The end of the discharge line should not be threaded or concealed and should be protected from freezing. No valve of any type, restriction or reducer coupling should be installed in the discharge line. Local codes shall govern the installation of relief valves.
4.GAS SUPPLY — The inlet gas pressure to the water heater must not exceed 10.5” w.c. (2.6 kPa) for Natural gas. For purposes of input adjust- ment, the minimum inlet gas pressure (with main burner on) is shown on the rating plate. Check to see if high or low gas pressure is present and then contact the gas company for correction.
The gas line should be of adequate size to prevent undue pressure drop. Sizing based upon Table 1 (on pg. 13) is recommended. No ad- ditional allowance is necessary for an ordinary number of fittings.
A ground joint union and manual shutoff valve should be installed in the gas line near the water heater so that the burner assembly may be easily removed. The shut-off valve must be readily accessible for turning on or off. See Fig. 4 on page 7.
A sediment trap must be installed at the bottom of the gas line. See Fig. 4 on page 7.
LEAK TESTING — The water heater and its gas connections MUST be leak tested at normal operating pressure before it is placed in op- eration. Turn ON the manual gas shut-off valve near the water heater. Use a soapy water solution to test for gas leaks at all connections and fittings. Bubbles indicate a gas leak that must be corrected. The water heater factory connections to the gas valve should also be leak tested after placing the water heater in operation.
