Raypak WH 0135A Installation & Operating Instructions Manual

Also see for Econopak WH-0090: Installation and operating instructions

13When 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 line should be no smaller than the out-let of the valve. The end of the discharge line shouldnot be threaded or concealed, and should be protect-ed from freezing. No valve of any type, restriction orreducer coupling, should be installed in the dischargeline. Local codes shall govern installation of reliefvalve.Temperature & Pressure GaugeThe temperature and pressure gauge is standardequipment on all hot water heaters. All temperatureand pressure gauges are shipped loose for field instal-lation in the outlet water connection (see Fig. 7). Allfittings required to mount the gauge to the piping aresupplied by others.Electrical WiringThe electrical power supply requirement for theseheaters is 120 volts, 60 Hz. Field wiring connectionsand electrical grounding must comply with the localcodes, or in the absence of local codes, with the latestedition of the National Electrical Code, ANSI/NFPA 70.Provide a separate fused circuit from the main electri-cal panel to the heater, and a disconnecting meanswithin sight of the heater.Remove the control box cover and make the powersupply connections in the field wiring compartment.(See general location of controls drawing). The pumpis supplied and factory wired to operate with theheater. The thermostat (tankstat) is shipped loose tobe installed in the tank at the installation site.NOTE: If it is necessary to replace any of theoriginal wiring, it must be replaced with 105°C wire orits equivalent, except 150° black wire which must bereplaced with 150° wire or its equivalent.NOTE: Minimum 18 AWG, 105°C, stranded wiremust be used for all low voltage (less than 30 volts)external connections to the unit. Solid conductorsshould not be used because they can causeexcessive tension on contact points. Install conduitas appropriate. All high voltage wires must be thesame size (105°C, stranded wire) as the ones on theunit or larger.WARNING: SHOCK HAZARD: Line voltage ispresent. Before servicing tankstat or heater, turn offelectrical power to the heater at the main disconnector circuit breaker. Failure to do so could result insevere personal injury or death.