OPERATOR'S MANUALNatural Gas (NG)-Factory DefaultLiquid Propane Gas (LPG)-Optional ConversionModel GU32 / 501(11,12,21,22)1321Model GU28 / 5
Maintenance and Service10SYSTEMS AND PARTS CHECKThe unit should be checked once a year or as neces-sary by a certified and trained technician. If rep
11TROUBLESHOOTINGThis unit has the ability to check its own operation continuously. If an error occurs, a message will flash on the digitalmonitor of
12Eternal Hybrid Water Heater Technical SpecificationsGU20 (Optional) GU26 GU28 (Optional) GU32501(11,12,21,22)1201 501(11,12,21,22)1261 501(11,12,21,
13Only specially trained and authorized techniciansare permitted to service this water heater.Unpack the unit carefully and make sure that allaccessor
T&P Valve and Exhaust Collar InstallationLoosen 2 screws holding the Front Panel at thebottom, push the panel down and towards yourselfto remove.
T&P Valve and Exhaust Collar InstallationInstall the Exhaust Collar and secure with M4screws.Install the T&P Relief Valve on the side of unit.
16This unit is to be installed on a floor.Do not install the unit standing directly on combus-tible surface.STANDING INSTALLATIONOUTDOOR INSTALLATIONI
17 Maintenance and ServiceINDOOR INSTALLATIONInstall 4" vent pipe directly on flue outlet.The water heater should be located in an area whereenou
18Mounting Procedure for Commercial / FoodserviceCaulking Method:Apply caulking along the bottom edge of the unit.Make sure the caulk is water tight a
Condensate Drain InstallationVERTICAL TERMINATIONHORIZONTAL TERMINATIONCONDENSATE DRAIN REQUIREMENTS WARNING! !If the condensate collector is not us
2Table of Contents WARNING! ! WARNINGPrimary Safety Warning...1-3Pre-Installation Instructions...
VENTING INSTRUCTIONExhaust Fans and VentilationThe water heater is equipped with a combustible airdetector to measure whether there is enough air forp
21Exhaust Venting InstallationThis water heater must be properly vented for removalof exhaust gases to the outside atmosphere. Correctinstallation of
22Gas meter/RegulaterVent Pipe Installation & Terminator PositionArea Descriptions Other than Direct VentAClearance above grade,veranda, porch, de
Venting Termination23 Venting TerminationHORIZONTAL VENTING PVC TERMINATIONVERTICAL VENTING PVC TERMINATIONVenting Material : PVC-DWV(ANSI/ASTM D2665
24Checking Gas Combustion SpecificationsFigure 1:The gas valve is designed with both test ports for gas supply pressure to the unit, and manifold pres
25Gas Supply PipingGAS SUPPLY PIPINGVenting Equipment CodesThis water heater must be vented in accordance with"Venting of Equipment" section
26Water Supply ConnectionWATER SUPPLY CONNECTIONAn approved manual water control valve (watershutoff valve) must be placed on the cold watersupply lin
27PRESSURE RELIEF VALVEWater Supply ConnectionWater pipe line joint:Pipe joint sealing compound or dope should be usedsparingly for sealing threaded j
28 Electrical ConnectionELECTRICAL CONNECTIONSInstallation Codes:Follow the requirements of the local authority having ju-risdiction. In the absence o
Controller DIP Switch Setting29Location of DIP SwitchDIP SwitchMain ControllerDefault Setting Layoutswitch 8 : NG / LPGswitch 7 : maximum gas input s
WARNING!!If you do not follow these instructions exactly,a fire or explosion could result causing propertydamage, personal injury or loss of life.Pr
30 Wiring and Connection Diagram
Remove Casing From Water HeaterLoosen 4 screws securing the Exhaust Collar andremove Exhaust Collar from Water heater. Loosen2 screws securing Top Pan
32Liquid Propane Gas(LPG) ConversionGas Packing-1Valve AdaptorGas ValveFlangeConnectorBracketGas ValvePackingReplace NG Valve Adaptor With LPG Adapto
33Recirculation System with an Eternal Water HeaterThese diagrams are for reference as basic guides. Each installation should be engineered properly a
Recirculation with 2 Units manifoldSingle Eternal with pre-heater, i.e. Solar34These diagrams are for reference as basic guides. Each installation sho
35Grand Hall will warrant to the ORIGINAL PURCHASER of this gas water heater that it will be free of defects inmaterial and workmanship for set period
4Parts Diagrams for Model GU28,32 / 501(11,12,21,22)1(28,32)1
5Parts List for Model GU28,32 / 501(11,12,21,22)1(28,32)1KEY DESCRIPTION Part # QTY18 Vent Cap Assembly ( Exhaust Top Included) 301080190 1KEY DE
Parts Diagrams for Model GU20,26 / 501(11,12,21,22)1(20,26)16
7Optional Parts For Outdoor ModelKEY DESCRIPTION Part # QTY18 Vent Cap Assembly ( Exhaust Top Included) 301080190 1Parts List for Model GU20,26 /
8This water heater does not have a pilot. It is equippedwith an ignition device which automatically lights theburner. Do not try to light the burner m
How To Use The Front Control Interface9Water TemperatureTime to Produce a Serious Burn120℉More than 5 minutes125℉1.5 to 2 minutes130℉About 30 seconds1
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