Eternal GU20 Operator'S Manual Download Page 33

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Recirculation System with an Eternal Water Heater

These diagrams are for reference as basic guides. Each installation should be engineered properly and compliant to
Local and State Codes.

Single Eternal with Storage Back-up

Summary of Contents for GU20

Page 1: ...in the vicinity of this or any other appliance WARNING 1 157020132 Date 2009 8 5 C WARNING California Proposition 65 lists chemical substances known to the state to cause cancer birth defects death serious illness or other reproductive harm This product may contain such substances be their origin from fuel combustion gas oil or components of the product itself WARNING WHAT TO DO IF YOU SMELL GAS D...

Page 2: ...P power cord free of dust DO NOT use a broken or modified power cord DO NOT bind bend or stretch power cord DO NOT connect the water heater to a solar water heater Never use this hot water heater unless it is completely filled with water To prevent damage to the tank the tank must be filled with water Water must be running from the hot water faucet before turning the main gasvalve to the water hea...

Page 3: ...1 Far away from water heater 2 In approved containers 3 Tightly closed 4 Out of children s reach Vapors 1 Cannot be seen 2 Vapors are heavier than air 3 Go a long way on the floor 4 Can be carried from other rooms to the main burner by air currents Thiswater heater doesnot have a pilot It isequipped with an ignition device that automatically lights the burner Do not try to light the burner by hand...

Page 4: ...4 Parts Diagrams for Model GU28 32 501 11 12 21 22 1 28 32 1 ...

Page 5: ...302040004 1 5 Panel Top Front 301040005 1 6 Panel Top Rear 301040006 1 7 Panel Bottom 151010009 1 8 Control Panel Assembly 301080170 1 9 Temperature and Pressure Relief Valve 194010281 1 10 Exhaust Collar Assembly 301070230 1 11 Drain Valve Assembly 305070273 1 12 Plug 601020001 2 13 Power Wire Assembly 192010143 1 14 Water Fitting Cap 155010059 4 15 Exhaust Flange 307040540 1 16 Packing Top 15201...

Page 6: ...Parts Diagrams for Model GU20 26 501 11 12 21 22 1 20 26 1 6 ...

Page 7: ... Front 301040001 1 2 Panel Rear 301040002 1 3 Panel Left 301040003 1 4 Panel Right 301040004 1 5 Panel Top Front 301040005 1 6 Panel Top Rear 301040006 1 7 Panel Bottom 151010009 1 8 Control Panel Assembly 301080170 1 9 Temperature and Pressure Relief Valve 194010281 1 10 Exhaust Collar Assembly 301070230 1 11 Drain Valve Assembly 305070273 1 12 Plug 601020001 2 13 Power Wire Assembly 192010143 1 ...

Page 8: ...O DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch Do not use any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department STARTING UP Once the unit has been properly installed check the gas and water connections for leaks Check for ...

Page 9: ...e indicated on the Digital Monitor The ON Indicator will light up When running the water by opening the water tap the water heater will start the burner automatically and the Digital Monitor will show the actual water temperature When water taps are closed the unit will stop the burner and the Digital Monitor will show the set temperature To switch the water heater OFF Press the Power Button The t...

Page 10: ...d up of sediment in faucet aerators shower heads and screens could impair water flow and cause the water heater to deliver less than its full output or to shut down completely Check any of these screens or shower heads on your faucets periodically and clean as necessary Physical Damage If the water heater has been sub jected to fire flood or physical damage turn off the manual gas shutoff valve an...

Page 11: ...ermistor A burner thermistor short open A secondary air hole thermistor short open A vent condition is not normal Temperature too high on a burner thermistor Mixing control valve is not connected Mixing control valve initialization failure Power line of main gas valve is open Rotation of a DC fan is too high low Carry over gas valve is not connected Modulation gas valve is not connected Acontrolle...

Page 12: ...stor Outlet Thermistor Burner Thermistor Air Thermistor Simulation Feedforward and Feedback w Electronically Controlled Mixing Valve 86 3 8 gal 6 4 gal Connections Water Temperature Sensing Orifice Size Maximum Valve Current Manifold Pressure Electrical Consumption Operating water pressure Water Holding Capacity Packaged Weight lbs Package Dimensions WxHxD Safety Devices Model Number CSA Maximum N...

Page 13: ...as vent The appliance should be located in an area where leakage of the tank or connections will not result in damage to the area adjacent to the appliance or to lower floors of the structure When such locations cannot be avoided it is recommended that a suitable drain pan be installed under the appliance The pan must not restrict combustion air flow The minimum inlet gas pressure must be within t...

Page 14: ... front of the unit This box contains T P Relief Valve x 1 Exhaust Collar x 1 O Ring G95 x 1 Mesh Screen x 1 Drain Cap x 1 Self Tapping Screw T4x16 x 5 Attach the Front Panel and push the panel up Secure with the previously removed screws Prior to installing the Exhaust Collar please secure the O Ring between the Exhaust Flange and botton of Exhaust Collar with T4 screws 1 14 2 3 ...

Page 15: ... with M4 screws Install the T P Relief Valve on the side of unit Make sure the T P Relief is secured to prevent water leak Vent Cap Installation For Outdoor Installation 4 15 Install the Vent Cap on the Exhaust Top Secure the Vent Cap by using clamp or screw on the Exhaust Top 1 5 ...

Page 16: ...es 2 inches EL From left side of unit gas piping side 12 inches 6 inches ER From right sideof unit 2 inches 2inches FL Floor combustible combustible A From top of water heater B From front of unit C From side wall flue or vent connector in any direction D From back of unit FL Floor EL From left side of unit gas piping side ER From right side of unit WARNING Do not have the flue terminal pointing t...

Page 17: ...e louvers openings into the dwelling each opening should give a minimum free area of one square inch per 15 000 Btu hour of the total input ratings of all appliances in the enclosed area Air supply from inside building When combustion air issupplied from inside the build ing each opening should give a minimum free area of one square inch per 3 750 Btu hour of the total input ratings of all applian...

Page 18: ...e unit on a water heater stand that raises the unit at least 6 from the floor where seepage can accumulate underneath the unit Description In compliance with NSF 5 standard water heaters should be mounted in a way that seepage cannot accumulate under the unit Grand Hall recommends either applying watertight caulking along the bottom edge of the unit with the floor surface or install Eter nal in co...

Page 19: ...9 All vertical terminating vent installations Horizontal terminating vent installations if a vertical rise in the vent system exceeds 5 ft If more than one elbow is used in the vertical section a condensate collector must be used The Exhaust Collar of this water heater has a built in condensate collector Use 1 2 ID vinyl tube to connect condensate drain port Do not use copper piping for any portio...

Page 20: ... length Single wall vent connectors must be at least 6 from adjacent unprotectedcombustible surfaces Joint of vent con nectors should be securely fastened by sheet metal screws or other approved method The entire vent system must not exceed the size specified in table VENTING LENGTH General rules for venting system Place the water heater as close as possible to the vent The vent collar on the wate...

Page 21: ...e wall or from the wall to the water heater whichever is most convenient The vent pipe must extend a minimum of 1 5 through the exterior wall Note that inside collars must be slipped over the vent piping before locating the pipe through the wall Before securing the inside and outside collars to the wall use a silicone sealer between pipe and opening to ensure water and air tight seal To prevent co...

Page 22: ... in s id e c o r n e r H C le a r a n c e to e a c h s id e o f c e n t e r lin e e x te n d e d a b o v e m e t e r r e g u la to r a s s e m b ly I C le a r a n c e to s e r v ic e r e g u la to r v e n t o u tle t J C le a r a n c e to n o n m e c h a n ic a l a ir s u p p ly in le t to b u ild in g to th e c o m b u s t io n a ir in le t t o a n y o th e r 4 fe e t fr o m b e lo w o r s id e o...

Page 23: ...cal terminations Condensate drain must be used in all vertical terminations Once the vent terminal location has been determined make a hole through the exterior wall to accommodate the vent pipe Vent pipe must exit exterior wall horizontally only Insert a small length of vent pipe through the wall and connect the coupling as shown in above illustration Place the 1 2 mesh metal screen inside the te...

Page 24: ...e unit Remove the gas supply pressure test port screw and connect manometer to this port turn on the gas to the water heater Turn the water heater on and open multiple taps to force unit into high fire check gas supply pressure at the test port with a manometer with unit in high fire 1 2 3 HOW TO CHECK MANIFOLD GAS PRESSURE While power and gas are off to the unit open any hot tap to flush and fill...

Page 25: ...ections Presence of soap bubbles foaming is a sign of gas leaks This appliance and its individual shut off valve must be isolated from the gas supply piping system by unplugging the unit and turning off the main gasvalve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1 2 PSI NATURAL GAS SUPPLY PIPING P ip e s iz e L e n g t h 1 0 2 0 3 0 4 0 5 0...

Page 26: ... line Failure to do so may cause damage to the heater There is a wire mesh filter to trap debris from enter ing the heat exchanger This will need to be cleaned periodically to prolong product life Troubleshooting Thermal Expansion Contact the water supplier or local plumbing inspector on how to control this situation WARNING Use only brass connection nipples Connecting different types of metals wi...

Page 27: ...tely reset and continues to release water immediately close the cold water inlet to the water heater followthe draining instructions and replacethetemperature pressurerelief valvewith a new one The discharge capacity must be at least 236 000 BTU HR for GU32 199 000 BTU HR for GU28 180 000 BTU HR for GU26 and 145 000 BTU HR forGU20 Care should be taken to ensure that 1 2 Ÿ Ÿ Ÿ Do not open the drain...

Page 28: ...he front panel of the appliance A means for switching off the 120 VAC power supply must be provided Wire the heater exactly as shown in the wiring diagram To ensure complete filling of the tank allow air to exit by opening the nearest hot water faucet Allow water to run until a constant flow is obtained This will let air out of the water heater and piping Check all new water piping for leaks Repai...

Page 29: ...ntroller Default Setting Layout switch 8 NG LPG switch 7 maximum gas input selection 1 switch 6 20 PV 26 PV or 28 PV 32 PV switch 5 OFF switch 4 MCU function switch 3 Temperature selection 1 switch 2 Temperature selection 2 switch 1 Temperature selection 3 O N 8 7 6 5 4 3 2 1 ...

Page 30: ...30 Wiring and Connection Diagram ...

Page 31: ...fice Remove theNG orifice from the Nozzle Holder and remove the gas pipe by loosening the 2 screws securing the gas pipe to the gas valve s Connector Bracket Install LP Kit Assembly Gas Tube can be bent if the nut and orifice are wrenched too hard Make sure a 15MM wrench is used to hold the orifice while using a wrench to loosen the nut WARNING Fixing Screw x 4pcs Air Mesh 4 Loosen the 4 screws se...

Page 32: ... ValveAdaptor LP Reverse the steps above by reassem bling the packing Gas Flange and Connector Bracket Make sure all screws and secure and tightened Change Dip Switch No 8 position from left to right 6 7 Reassemble Water Heater Casing 8 Attach Top Panel and back on frame of the water heater and tighten the 2 screws Attach Exhaust Top on Top Panel and tighten the 4 screws Attach Control Panel Assem...

Page 33: ...ation System with an Eternal Water Heater These diagrams are for reference as basic guides Each installation should be engineered properly and compliant to Local and State Codes Single Eternal with Storage Back up ...

Page 34: ...lation with 2 Units manifold Single Eternal with pre heater i e Solar 34 These diagrams are for reference as basic guides Each installation should be engineered properly and compliant to Local and State Codes ...

Page 35: ... of such replacement parts This Warranty does not cover any failures or operating difficulties due to accident abuse misuse alteration misapplication vandalism improper installation maintenance or service as set out in this Operator s Manual Deterioration or damage due to severe weather conditions such as hail hurricane earthquakes tsunami torna does Acts of God or terrorism discoloration due to e...

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Eternal GU20, Operator'S Manual

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