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Фрагмент инструкции
This relief valve shall comply with the Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply systems, “ANSI Z21.22-1986 or latest edition”. This relief valve should have a temperature rating of 2100F (98.8°C), a pressure rating not exceeding the lowest rated working pressure of any system component and a discharge capacity exceeding the total input of the water heaters supplying water to the storage tank. Select a relief valve with a discharge capacity exceeding the maximum heater input rating and a pressure rating not exceeding the working pressure shown on the rating plate of the heater. Locate the T & P relief valve in the top of the tank, or in the side of the tank on centerline within the upper 6 inches from the top of the tank. See installation diagrams. Tapping shall be threaded in accordance with the latest version of the Standard for Pipe Threads, General Purpose (inch), ANSI/ASME B1.20.1. Mark location with a Class III label. See ANSI Z21.10.1, Part 1, MARKING. 9 Your local code authority may have other specific relief valve requirements not covered in this section. THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER DAMAGE. TO AVOID SCALDING OR WATER DAMAGE, A DRAIN LINE MUST BE CONNECTED TO A RELIEF VALVE TO DIRECT DISCHARGE TO A SAFE LOCATION. A DRAIN LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND IT MUST NOT CONTAIN ANY VALVES BETWEEN THE HEATER AND THE RELIEF VALVE OR THE RELIEF VALVE AND THE DRAIN LINE EXIT. IN ADDITION, THERE SHOULD NOT BE ANY RESTRICTIONS IN A DRAIN LINE NOR SHOULD IT BE ROUTED THROUGH AREAS WHERE FREEZING CONDITIONS MIGHT OCCUR. DO NOT THREAD OR CAP THE DRAIN LINE EXIT. RESTRICTING OR BLOCKING A DRAIN LINE WILL DEFEAT THE PURPOSE OF THE RELIEF VALVE AND MAY CREATE AN UNSAFE CONDITION. INSTALL A DRAIN LINE WITH A DOWNWARD SLOPE SUCH THAT IT NATURALLY DRAINS ITSELF. Recommended locations of relief valves are shown in the installation diagrams. HARD WATER Where hard water conditions exist, water softening or the threshold type of water treatment is recommended. This will protect the dishwashers, coffee urns, water heaters, water piping and other equipment. When water softening or water treatment is not practical, a comparatively easy method of periodic lime removal from the heater may be employed by installing gate valves, drain valve and acid fill opening as shown in PREVENTIVE MAINTENANCE section of this manual. CLOSED WATER SYSTEM A closed system will exist if a back-flow prevention device (check valve), pressure reducing valve, or other similar device is installed in the cold water line between the water heater and the street main (or well). Excessive pressure may develop due to the thermal expansion of heated water causing premature tank failure or intermittent relief valve operation. This is not a warranty failure. An expansion tank may be necessary in the cold water supply to alleviate this situation. Contact the local plumbing authority. WATER LINE CONNECTIONS This manual provides detailed installation diagrams for typical methods of application. See piping diagrams. • Cer-Temp 80 Recovery System (for one temperature water). These diagrams will serve to provide the installer with a reference for the materials and method of piping necessary for installation. It is essential that all water and gas piping, vent connections, electrical wiring and check and flow regulating valves be installed as shown on the diagrams. Consult the installation diagrams for appropriate locations to install the safety flow switch(es), drain valves, thermometers, relief valves and the circulating pump(s). Apply suitable pipe thread sealing compounds to only the male threads of parts to be connected. If any of these parts are being replaced in a functioning system, remember to shut off the manual gas and control valve(s) and close off the water inlet(s). Open a nearby faucet to relieve pressure and drain the heater and/or system before attempting to install the new parts. Check the diagrams thoroughly before starting installation to avoid errors and minimize time and material costs. If the system is to be filled with water for testing or other purposes during cold weather and before actual operation, care must be taken to prevent a downdraft entering the heater or freezing air from contacting the system. Failure to do so may cause the water in the system to freeze with resulting damage to the system. Damage due to freezing is not covered by the warranty. WATER (POTABLE) HEATING 1. All piping components connected to this unit for space heating applications shall be suitable for use with potable water. 2. Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system. 3. This unit may NEVER be connected to any existing heating system or component(s) previously used with a non-potable water heating a...
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