OPERATOR'S MANUAL C Natural Gas (NG)-Factory Default Liquid Propane Gas (LPG)-Optional Conversion Model GU32 Model GU28 Model GU26 Model GU20 / / / / 501(11,12,21,22)1321 501(11,12,21,22)1281 (Optional) 501(11,12,21,22)1261 501(11,12,21,22)1201 (Optional) Service Information Center: ! ! Read this Operator's Manual carefully and be sure your Water Heater is properly assembled, installed and maintained.
Table of Contents ! CAUTION WARNING WARNING ! Primary Safety Warning...............................1-3 Pre-Installation Instructions...............................3 Parts Diagram and List for GU28/GU32....4-5 Parts Diagram and List for GU20/GU26....6-7 Operating Instructions.................................8-9 Use & Care Instructions • Maintenance and Service............................10 • Troubleshooting............................................. 11 • Specifications.................................
Pre-Installation Instructions for Your Safety ! WARNING TO TURN OFF GAS TO WATER HEATER 1. Turn off all electrical power to the water heater if service is to be performed. ! If you do not follow these instructions exactly, a fire or explosion could result causing property damage, personal injury or loss of life. 2. Turn the manual gas valve located on the outside of the unit clockwise to the off position.
Parts Diagrams for Model GU28,32 / 501(11,12,21,22)1(28,32)1 4
Parts List for Model GU28,32 / 501(11,12,21,22)1(28,32)1 KEY DESCRIPTION Part # QTY 1 Panel, Front 302040001 1 2 Panel, Rear 302040002 1 3 Panel, Left 302040003 1 4 Panel, Right 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
Parts Diagrams for Model GU20,26 / 501(11,12,21,22)1(20,26)1 6
Parts List for Model GU20,26 / 501(11,12,21,22)1(20,26)1 KEY DESCRIPTION Part # QTY 1 Panel, 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
Operating Instructions NORMAL OPERATION To turn on your water heater STARTING THE SYSTEM For your safety, read before operating This water heater does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner manually. 1. Open a hot water tap. Before operating, make sure that a gas leak is not evident by smelling the area around the unit. Be sure to smell next to the floor because gas is heavier than air and will settle on the floor.
How To Use The Front Control Interface 1. To switch the water heater ON: from OFF condition Press the Power Button. -The temperature selected will be indicated on the Digital Monitor. -The ON Indicator will light up. 2. 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.
Sediment Build-up: Unlike a typical storage tank, this heater has a self cleaning system initiated by the flow of water. Build 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.
Troubleshooting TROUBLESHOOTING This unit has the ability to check its own operation continuously. If an error occurs, a message will flash on the digital monitor of the front panel. This assists with diagnosing the error, and may enable you to overcome a problem without a service call. Please quote the code displayed when inquiring about service.
Eternal Hybrid Water Heater Technical Specifications Model Name GU20 (Optional) GU26 Model Number (CSA) 501(11,12,21,22)1201 501(11,12,21,22)1261 Installation Type GU28 (Optional) GU32 501(11,12,21,22)1281 501(11,12,21,22)1321 Indoor or Outdoor Flue system Forced Exhaust Power Vent Operation With or Without Remote Controls Direct Electronic Ignition and Automatic Flame Sensing Ignition Gas Valve Type Current Controlled Double Stage Negative Pressure Full Modulation Gas Valve Burner System
Installation Preparation 2. If vented through an outside wall or through the roof PROFESSIONAL INSTALLATION REQUIRED Only specially trained and authorized technicians are permitted to service this water heater. using 4" vent piping the total vent run cannot exceed 35 feet with one 90 elbow. If more elbows are required the venting distance must be reduced 5 feet for every 90 elbow.
T&P Valve and Exhaust Collar Installation 1. Loosen 2 screws holding the Front Panel at the bottom, push the panel down and towards yourself to remove. Take the accessory box out of the 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 2. Attach the Front Panel and push the panel up. Secure with the previously removed screws. 3.
T&P Valve and Exhaust Collar Installation 4. Install the Exhaust Collar and secure with M4 screws. 5. 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) 1. Install the Vent Cap on the Exhaust Top. Secure the Vent Cap by using clamp or screw on the Exhaust Top.
Outdoor Installation STANDING INSTALLATION This unit is to be installed on a floor. Do not install the unit standing directly on combustible surface. OUTDOOR INSTALLATION Installation Codes : Follow all local codes, or in the absence of local codes, follow the codes for installation of gas burning appliances; National fuel gas code ANSI Z221.23. For outdoor installation, do not remove the vent cap from the top of the appliance.
Maintenance and Service Indoor Installation Air supply from outside building: When combustion air is supplied directly through an outside wall such as intake 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. INDOOR INSTALLATION Install 4" vent pipe directly on flue outlet.
Mounting Procedure for Commercial / Foodservice 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 Eternal in conjunction with a water heater stand or platform that would raise the unit at least 6”off the floor. Caulking Method: Apply caulking along the bottom edge of the unit.
Condensate Drain Installation CONDENSATE DRAIN REQUIREMENTS VERTICAL TERMINATION HORIZONTAL TERMINATION Condensate formation can occur in high efficiency power vent appliances. To prevent condensate damage, a condensate drain must be installed under the following conditions: 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.
Exhaust Venting Installation EXHAUST VENTING INSTALLATION Exhaust Fans and Ventilation The water heater is equipped with a combustible air detector to measure whether there is enough air for proper combustion. If there is not, the water heater will not work until sufficent air is provided. Any equipment, which uses air from an enclosed space, can deplete the air from that area.
Exhaust Venting Installation This water heater has been design certified by CSA International for use with the specified listed plastic vent pipe. CEMENTING PVC, ABS or CPVC PIPE and FITTING All primers, cleaners and cements must meet all local codes and applicable standards of the American Society for Testing Materials. This water heater must be properly vented for removal of exhaust gases to the outside atmosphere.
Vent Pipe Installation & Terminator Position EXHAUST VENT TERMINATOR POSITION A re a D e sc rip tio n s O th e r th a n D i r e c t V e n t C le a r a n c e a b o v e g r a d e , 1 fo o t v e r a n d a , p o r c h , d e c k , o r b a lc o n y C le a r a n c e t o w in d o w o r d o o r t h a t 4 f e e t f r o m b e lo w o r B s id e o p e n in g .
Venting Termination Venting Material : PVC-DWV(ANSI/ASTM D2665) VERTICAL VENTING PVC TERMINATION HORIZONTAL VENTING PVC TERMINATION Once the v ent 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.
Checking Gas Combustion Specifications Model Manifold Pressure Min Max Gas Supply Pressure GU20 0.9 "WC 1.6 "WC GU26 0.9 "WC 2.4 "WC GU28 0.5 "WC 1.8 "WC GU32 0.5 "WC 2.5 "WC NG 3.5~10.5 "WC GU20DV 0.9 "WC 1.6 "WC GU26DV 0.9 "WC 2.4 "WC GU28DV 0.4 "WC 1.75 "WC GU32DV 0.4 "WC 2.4 "WC LP 8~14 "WC Figure 1: The gas valve is designed with both test ports for gas supply pressure to the unit, and manifold pressure. Refer to Figure 1 for locations of the test ports on the gas valve.
Gas Supply Piping Check for Gas Leaks When connections are completed, check for gas leaks by applying soapy water to all gas fittings and connections. Presence of soap bubbles foaming is a sign of gas leaks. GAS SUPPLY PIPING NOTE: This unit needs a manual gas control valve (shut-off valve) that must be connected to the unit before the gas line. Check the gas inlet pressure and the type of gas matching the rating plate located on your water heater.
Water Supply Connection WATER SUPPLY CONNECTION An approved manual water control valve (water shutoff valve) must be placed on the cold water supply line. AFTER INSTALLATION After the water heater installation is complete, purge the water line to remove all the debris and air from the line. Failure to do so may cause damage to the heater. All soldering materials and piping materials must be suitable with potable water.
Water Supply Connection PRESSURE RELIEF VALVE ! CAUTION Water pipe line joint: Pipe joint sealing compound or dope should be used sparingly for sealing threaded joints on metal piping having NPT tapered thread. ! Do not use glue or Teflon tape. The temperature-pressure relief valve should be manually opened once a year. ! CAUTION ! ! ! CAUTION ! If local codes require the water heater to be raised 18” above the floor, please install GU20/GU26 on at least 6.5” platform.
Electrical Connection ELECTRICAL CONNECTIONS ! WARNING ! ! Installation Codes: Follow the requirements of the local authority having jurisdiction. In the absence of such requirements, follow the latest edition of the National Electrical Code ANSI/ NFPA 70. WARNING ! Label all wires prior to disconnection when servicing controls. Wiring error can cause improper and dangerous operation. Verify proper operation after servicing. The water heater must be electrically grounded.
Controller DIP Switch Setting Location of DIP Switch DIP Switch Main Controller 8 7 switch 7 : maximum gas input selection 1 6 switch 6 : 20 PV / 26 PV or 28 PV / 32 PV 5 switch 5 : OFF 4 switch 4 : MCU function 3 switch 3 : Temperature selection 1 2 switch 2 : Temperature selection 2 switch 1 : Temperature selection 3 ON switch 8 : NG / LPG 1 Default Setting Layout 29
Wiring and Connection Diagram 30
Liquid Propane Gas(LPG) Conversion Top Panel Exhaust Collar Remove Casing From Water Heater 1. Loosen 4 screws securing the Exhaust Collar and remove Exhaust Collar from Water heater. Loosen 2 screws securing Top Panel and push towards the rear of the unit and remove the Top Panel. Loosen 2 screws securing the Front Panel on the bottom front, and push downwards to remove the Front Panel. Front Panel Control Panel Assembly 2 .
Liquid Propane Gas(LPG) Conversion Replace NG Valve Adaptor With LPG Adaptor Gas Packing-2 Valve Adaptor Gas Packing-3 G as Val ve Flange Gas Packing-1 Packing Gas Valve Conne c tor Bracket 6 . Loosen and remove 5 screws securing the Gas Valve Flange. Remove the Gas Valve Flange, Packing and Valve Adaptor(NG). Replace Valve Adaptor(NG) with Valve Adaptor(LP). Reverse the steps above by reassembling the packing, Gas Flange and Connector Bracket. Make sure all screws and secure and tightened.
Recirculation System with an Eternal Water Heater Single Eternal with Storage Back-up These diagrams are for reference as basic guides. Each installation should be engineered properly and compliant to Local and State Codes.
Recirculation with 2 Units manifold Single Eternal with pre-heater, i.e. Solar These diagrams are for reference as basic guides. Each installation should be engineered properly and compliant to Local and State Codes.
Grand Hall Limited Warranty Grand Hall will warrant to the ORIGINAL PURCHASER of this gas water heater that it will be free of defects in material and workmanship for set period below from the date of purchase when installed and operated in a singlefamily residence in accordance with the instructions in the manual and all local/state/federal codes.
