Reliant FVIR GAS WATER HEATER Installation Instructions And Use & Care Manual
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Contents
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18• Be sure to follow the manual(s) shipped with the airhandler system.• This water heater is not to be used as a replacementfor an existing boiler installation.• Do not use with piping that has been treated withchromates, boiler seal or other chemicals and do notadd any chemicals to the water heater piping.• If the space heating system requires watertemperatures in excess of 120°F, a tempering valveor an anti-scald device should be installed per itsmanufacturer’s instructions in the domestic (potable)hot water supply to limit the risk of scald injury.• Pumps, valves, piping and fittings must be compatiblewith potable water.• A properly installed flow control valve is required toprevent thermosiphoning. Thermosiphoning is theresult of a continuous flow of water through the airhandler circuit during the off cycle. Weeping (blow off)of the temperature and pressure relief valve (T & P)or higher than normal water temperatures are the firstsigns of thermosiphoning.• The domestic hot water line from the water heatershould be vertical past any tempering valve or supplyline to the air handler to remove air bubbles from thesystem. Otherwise, these bubbles will be trapped in theair handler heat exchanger coil, reducing the efficiency.• Do not connect the water heater to any system orcomponents previously used with non-potable waterheating appliances when used to supply potable water.Some jurisdictions may require a backflow preventer in theincoming cold water line. This may cause the temperatureand pressure relief valve on the water heater to dischargeor weep due to expansion of the heated water. Adiaphragm-type expansion tank suitable for potable waterwill normally eliminate this weeping condition. Pleaseread and follow the manufacturer’s instructions for theinstallation of such tanks.Also see Water System Piping for additional instructionson the safe and correct installation and operation of thiswater heater.TYPICAL TEMPERING VALVE INSTALLATION COMBINATIONSPACE HEATING/POTABLE WATER HEATING SYSTEMTEMPERINGVALVEHOTWATEROUTUNIONSINMUST BE VERTICAL TOREMOVE AIR BUBBLESDOMSETICHOT WATEROUTFLOW CONTROLVALVEPUMPOUTCOILAIRHANDLERTOAIRHANDLERSHUT-OFFVALVEMASSACHUSETTS CODEDOES NOT ALLOW THISTYPE OF INSTALLATION.EXPANSION TANKVACUUMRELIEFVALVECOLD WATER INLETFIGURE 16.Solar InstallationIf this water heater is used as a solar storage heateror as a backup for the solar system, the water supplytemperatures to the water heater tank may be in excessof 120°F. A tempering valve or other temperature limitingvalve must be installed in the water supply line to limit thesupply temperature to 120°F.NOTE: Solar water heating systems can often supplywater with temperatures exceeding 180°F and may resultin water heater malfunction. |
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