Raypak 2600401 Installation & Operating Instructions Manual

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Raypak 2600401 Installation & Operating Instructions Manual Manual pdf 15 page image

15If this water heater is installed in a closed water supplysystem, such as one having a back-flow preventer inthe cold water supply line, means shall be provided tocontrol thermal expansion. Contact the water supplieror local plumbing inspector on how to control this situ-ation.When this water heater system is supplying generalpurpose hot water requirements for use by individuals,a thermostatically controlled mixing valve is recom-mended to reduce the risk of scald injury. Contact alicensed plumber or the local plumbing authority forfurther information.Thermometer(s) should be installed so that they indi-cate the water temperature at or near the outlet of thestorage tank.Relief ValveA new combination temperature and pressure (T & P)relief valve, complying with the Standard for ReliefValves and Automatic Gas Shut Off Devices for HotWater Supply Systems, ANSI Z21.22, must beinstalled in the opening provided on top of the storagetank, at the time of installation. No valve is to be placedbetween the relief valve and the storage tank.The pressure rating of the relief valve must not exceedthe 160 maximum working pressure indicated on thewater heater rating plate. The BTUH rating of the reliefvalve must not be less than the BTUH input of theheater.Connect the outlet of the relief valve to a suitable opendrain. The discharge line must pitch downward fromthe valve to allow complete draining (by gravity) of therelief valve and discharge line. The discharge lineshould be no smaller than the outlet of the valve. Theend of the discharge line should not be threaded orconcealed, and should be protected from freezing. Novalve of any type, restriction or reducer coupling,should be installed in the discharge line. Local codesshall govern installation of relief valve.FLOW SWITCHINLET/OUTLETWATERCONNECTIONSPRVRATING PLATEON/OFFSWITCHELECTRICALCONTROLSLOCATIONHIGH LIMITSPILOT LOCATIONCOMBINATIONGAS VALVEOPTIONALPUMPFig. 14: 0261 Low NOx WH1 with Pressure Relief Valve