Eternal GU125T, GU160T, GU125T/518111125, GU125T/518121125, GU160T/518111160 Installation And Operation Manual
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Service Information Center:
Call us first if you have any questions with this product. We can help you with questions about assembly
and Water Heater operation or if there are any damaged or missing parts when you unpack this unit from the
shipping box. Please call before returning to the store.
1-866-946-1096
8:00am-4:30pm CST, Monday through Friday
157320069 Date 2014/11/20
Installation ● Operation Manual
Natural Gas (NG) - Factory Default
Liquid Propane Gas (LPG) - Optional Ori ce
RESIDENTIAL WATER HEATERS
POWER VENT OR DIRECT VENT CONVERTIBLE
ELECTRONIC IGNITION
Model GU125T / 518(11,12)1125
GU160T / 518(11,12)1160
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
Read this Operator's Manual carefully and be sure your Water Heater is properly assembled, installed and
maintained. Failure to follow these instructions exactly could result in re, explosion, serious bodily injury and/or
property damage.
WARNING
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IMPORTANT:
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Only specially trained and authorized personnel are permitted to service this water heater.
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NOTE TO ASSEMBLER / INSTALLER:
Leave this manual with the consumer.
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NOTE TO CONSUMER:
Keep this manual for future reference.
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RECORD YOUR SERIAL #_________________
(see clear CSA label on Gas Water Heater)
Only a licensed professional can install Eternal units for safety and code compliance. Venting and plumbing
codes can vary by location. Installation instructions and all applicable codes must be followed or property
damage, severe injury, or death may result. Failure to use a licensed plumber or contractor, follow venting,
plumbing, and building codes, or follow installation instructions may be unlawful and will void the product
warranty. Grand Hall is not responsible for any costs incurred for repairing any problems resulting from failure to
follow installation instructions or applicable codes.
WARNING
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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
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Table of Contents
Included & Optional Accessories P3
Eternal Hybrid Water Heater Technical Specification P4
Dimensions P5
Parts & Service Parts List P6~8
Instructions for Your Safety P9
Typical Installation P10
Installation Preparation P11
Exhaust / Water Heater Stand / Condensate Trap Installation P12
Piping Installation P13
Condensate Disposal P14
Condensate Piping P15
Indoor Installation / High Elevation P16
Floor Mounting
P17
Venting Intake & Exhaust Material P18
Venting Specification P19
Vertical & Horizontal Termination
P20~21
Clearance Requirements from Vent Terminations to Building Openings P22
Multiple Units Termination P23
Vent Pipe Installation & Terminator Position P24
Gas Supply Piping P25
LP Conversion P26
Water Supply Connection P27
Temperature and Pressure Relief Valve & Electrical Connection P28
Recirculation System with an Eternal Water Heater & Recirculation with 2 Units Manifold P29
Operating Instructions & Temperature Setting Procedure P30
How To Use The Front Control Interface P31
Maintenance and Service P32
"D" Button Diagnostic Function P33
Diagnostics P34
Wiring and Connection Diagram P35
Grand Hall Limited Warranty P36~37
The stand assembly / installation manual P38~39
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Included Accessories
Optional Accessories
4
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Maximum manifold pressure is indicated on the rating label on right side of the unit.
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AHRI Certi ed.
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Independent DOE tested.
Eternal Hybrid Water Heater Technical Speci cations
Model Name
GU125T GU160T
Energy Factor (*) / Thermal Ef ciency (*)
0.82 Energy Factor / 96%
Installation Indoor / Floor Standing
Vent Run 3" PVC Up to 100ft, 6 Elbows Max, 5ft Deduction Per Elbow
Condensate pH Level 4 pH
Gas Type Pre-set For NG / LP Conversion Kit Included
Unit Connections Water 3/4" male NPT
Gas 1/2", 3/4" Female NPT
Electricity Dedicated 120VAC, 60Hz w/3 Pronged Power Cord
Gas Input Rate Max 75,000 BTU/Hr 100,000 BTU/Hr
Gas Supply Pressure NG / LP 3.5" WC to 10.5" WC / 8" WC to 14" WC
Ignition System Direct Electronic Ignition w/Automatic Flame Sensing
Burner System Sealed Combustion with Metal Fiber Premix Burner
Gas Valve System Dual Stage Negative Pressure Modulation
Reserve Tank 20 Gallons 20 Gallons
First Hour Rating 120 Gallons 160 Gallons
Activation Sensing Tank Temperature
Temperature Control
Thermistor Starts with Heating Cycle
Output Temperature Setting Range Mechanical Tempering Valve from 70°F to 145°F(Factory Preset 120°F)
Unit Dimensions (Round x Height) 20.9" x 46.9"
Unit Weight
120
Safety Devices T&P Valve, Flame Rod, Remaining Flame Detection, Fan RPM Check,
Vent Blockage Detection, Thermostat Switches(194°F), 1 x 5A Fuse, Intake
Blockage Detection.
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Dimensions - GU125T / 518(11,12)1125
GU160T / 518(11,12)1160
6
Dimensions - GU125T / 518(11,12)1125
GU160T / 518(11,12)1160
7
Dimensions - GU125T / 518(11,12)1125
GU160T / 518(11,12)1160
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KEY DESCRIPTION
PARTS No.
1 Pour Foam(PU) 332120087
2 Top Service Panel 332040047
3 Top Cover 332040046
4 Air Intake 152320178
5 Mesh Screen 151320057
6 Chassis 332010013
7 Main Controller 193320041(GU125T) / 193320101(GU160T)
8 Controller Cover 152320048
9 T&P Relief Valve 194140151
10 Drain Valve 150050273
11 Pipe Foot 155140027
12 Main Power Cord 192320148
13 Handle 195320059
14 Pipe Support 151320061
15 Water Heater Stand 332070080
16 Outlet Water Pipe 332060040
17 Two Way Valve 150320023
18 Tempering Valve 194320110
19 Exhaust Adaptor 152320028
20 Trap Clamp 151010032
21 Condensate Trap 332070125
22 Intake Air Pressure Switch 192320116(GU125T) / 192290098(GU160T)
23 Exhaust Air Pressure Switch 192320117(GU125T) / 192290098(GU160T)
24 Gas Adaptor 150320054
25 Gas Tube 150320038
26 Gas Valve 194140204
27 Radial Blower Assembly 192320037(GU125T) / 192320100(GU160T)
28 Ignitor 193320094
29 Ignitor Box 332010036
30 Gas Valve Support 332010037
31 Pipe Clamp 190180003
32 Exhaust Chamber 152320027
33 Burner Assembly 332010014
34 Water Tank 332020005
35 H/E Thermistor 193320113
36 Outlet Thermistor 193320091
37 Radial Blower Adaptor 152320065
38 APS Adaptor 152140233
39 GV Power Plug 152140205
Dimensions - GU125T / 518(11,12)1125
GU160T / 518(11,12)1160
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Instructions for Your Safety
WARNING
If you do not follow these instructions exactly, a re or explosion could result causing property damage, personal
injury or loss of life.
Installation Codes
Before Installation
The installation must conform with local codes or, in the absence of local codes, with National Fuel Gas Code,
ANSI Z223.1/NFPA 54.
Properly ground the unit in accordance with all local codes or, in the absence of local codes, with the National
Electrical Codes, ANSI/NFPA 70.
This water heater does not have a pilot. It is equipped with an ignition device that automatically lights the burner.
Do not try to light the burner by hand.
Smell all around the water heater area for evidence of leaking gas. Be sure to smell next to the oor because LP
gas is heavier than air and will settle on the oor.
Use only your hand to turn the manual gas valve knob. Never use tools. If the knob will not turn by hand, don't try
to repair it. Call a quali ed service technician. Forced or attempted repair could result in a re or explosion.
Do not use this water heater if any part has been under water. Immediately call a quali ed service technician to
inspect the water heater and to replace any damaged parts.
Far away from water heater
In approved containers
Tightly closed
Out of children's reach
Cannot be seen
Vapors are heavier than air
Go a long way on the oor
Can be carried from other rooms to the main burner by air currents
Turn off all electrical power to the water heater if service is to be performed.
Turn the manual gas valve located on the outside of the unit clockwise to the off position.
Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store
ammable products such as gasoline, solvents or adhesives in the same room or area near the water heater.
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Keep ammable products
Vapors
TO TURN OFF GAS TO WATER HEATER
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WHAT TO 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 re department.
WARNING
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Use this water heater at your own risk. The set outlet water temperature can cause severe burns instantly or
death from scalds. Test the water before bathing or showering. Do not leave children or the disabed without
supervision.
WARNING
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WARNING
Typical Installation
10
Thermal Expansion
Determine if a check valve exists in the inlet water line. Check with your local water utility company. It may have
been installed in the cold water line as a separate back ow preventer, or it may be part of a pressure reducing
valve, water meter or water softener. A check valve located in the cold water inlet line can cause what is referred to
as a “closed water system.” A cold water inlet line with no check valve or back ow prevention device is referred to
as an “open” water system.
As water is heated, it expands in volume and creates an increase in the pressure within the water system. This
action is referred to as “thermal expansion.” In an “open” water system, expanding water which exceeds the
capacity of the water heater ows back into the city main where the pressure is easily dissipated.
A “ closed water system,” however, prevents the expanding water from flowing back into the main supply line,
and the result of “thermal expansion” can create a rapid and dangerous pressure increase in the water heater
and system piping. This rapid pressure increase can quickly reach the safety setting of the relief valve, causing
it to operate during each heating cycle. Thermal expansion, and the resulting rapid and repeated expansion and
contraction of components in the water heater and piping system can cause premature failure of the relief valve,
and possibly the heater itself. Replacing the relief valve will not correct the "problem!"
The suggested method of controlling thermal expansion is to install an expansion tank in the cold water line
between the water heater and the check valve (see illustration above). The expansion tank is designed with an air
cushion built in that compresses as the system pressure increases, thereby relieving the over pressure condition
and eliminating the repeated operation of the relief valve. Other methods of controlling thermal expansion are
also available. Contact your installing contractor, water supplier or plumbing inspector for additional information
regarding this subject.
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Installation Preparation
Unpack the unit carefully and make sure that the included accessories are put aside so they will not be lost.
● Operator's manual ● Warranty Registration Card ● Included Parts
Inspect the water heater for possible shipping damages.
Check the markings of the rating plate on the water heater to be certain the type of gas being furnished
corresponds to what the water heater is equipped for.
Do not connect this water heater to a fuel type not in accordance with the rating plate.
Carefully choose the location for the new heater, as placement is a very important consideration for the safety of
the occupants in the building and for the most economical use of the appliance.
Whether replacing an old water heater or putting the water heater in a new location, consider the following critical
points:
Read the Safety guidelines in the beginning of this manual.
The internal computer controlled regulator is preset by the manufacturer and should not be adjusted by the
user.
Maintain proper space around the unit for servicing. Install the unit so that it can be connected or removed
easily.
The electrical connection requires a means for switching off the power supply.
Avoid installing the unit in an area with high levels of dust, sand, or debris. These particles may clog the air
vent or impair the function of the fan, leading to improper combustion. Regular maintenance is needed.
Do not install the unit where the exhaust vent is pointing into any opening in a building or where the noise may
disturb neighbors.
The location selected should be as close to the vent termination point as possible, and centered within the
water piping system for best hot water delivery.
If vented through an outside wall or through the roof using 3" vent piping, the total vent run cannot exceed 95
feet with one 90° elbow. If more elbows are required, the venting distance must be reduced 5 feet for every
90° elbow.
Condensation may be created at times as the combustion gases exit the vent cap. Discoloration of surfaces in
proximity to the vent cap may occur.
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Unpacking Your Eternal Water Heater
Additional Safety Instructions
Water Heater Placement
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WARNING
All water heaters eventually can leak. 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 lowers floors
of the structure. It is required that a suitable drain pan be installed under the appliance drain pans are
available at your local hardware store. Such drain pan must have a clearance of at least 1.0” (2.5cm)
greater than any point on the water heater’s outer jacket and must be piped to an adequate drain.
The minimum inlet gas pressure must be within the value speci ed by the manufacturer and the minimum value
listed is only for the purpose of input adjustment.
If a water heater is installed in a closed water supply system, such as one having a back ow preventer in the
cold water supply line, then a thermal expansion tank is required, contact the water supplier or local plumbing
inspector on how to control this situation.
The Temperature and Pressure (T&P) relief valve must be certi ed as meeting the requirement of the Standard
for Relief Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems ANSI Z21.22/CAN1-
4.4. The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working
pressure of the water heater (150 psi) and a discharge capacity not less than the water heater input rate as
marked on the rating plate.
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WARNING
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Before Commencing The Installation
Check that it is in accordance with relevant building
and mechanical codes, as well as any local, state or
federal regulations.
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CAUTION
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CAUTION
The drain valve must be tightened by
Hand ONLY, not by tools of any kind.
Exhaust / Water Hearter Stand / Condensate Trap Installation
Installation Procedure:
12
Assemble the included water heater stand as per installation procedure.
Insert condensate trap into the exhaust adaptor, and install trap clamp.
Place exhaust pipe inside exhaust adaptor socket bottom. Then, hold the exhaust pipe in place, by attaching the
pipe clamp to the pipe support using 2 (M5) screws.
Factory supplied water heater stand & condensate trap must be installed.
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WARNING
WARNING
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