Eternal GU100/508111100, GU100/508221100, GU100/508121100, GU100/508211100 Installation & Operation Manual

Service Information Center:

Call us rst 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

8am-4pm CST, Monday through Friday

157290081P Date 2011/12/15

Installation ● Operation Manual

Natural Gas (NG) - Factory Default
Liquid Propane Gas (LPG) - Optional Orice

Model GU100 / 508(11,12,21,22)1100

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

! !

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.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.

WARNING

! !

IMPORTANT:

●

Only specially trained and authorized personnel are permitted to service this water heater.

●

NOTE TO ASSEMBLER / INSTALLER:

Leave this manual with the consumer.

●

NOTE TO CONSUMER:

Keep this manual for future reference.

●

RECORD YOUR SERIAL #________________

(see silver 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

! !

1

C

2

Table of Contents

Included & Optional Accessories P3
Specifications P4

Dimensions P5

Parts & Service Parts List P6~8

Pre-Installation Instructions for Your Safety P9

Installation Preparation P10

Condensate Disposal P11

Indoor & Outdoor Installation P12~13

Mobile Home Installation & EC Adapter Installation P14

Wall & Floor Mounting P15~16

Venting Intake & Exhaust Material P17

Venting Specification P18

Vertical & Horizontal Termination P19~20

Clearance Requirements from Vent Terminations to Building Openings P21

Multiple Units Termination P22

Concentric Vent Kit & Outdoor Vent Kit Installation P23

Vent Pipe Installation & Terminator Position P24

Gas Supply Piping P25

LP Conversion P26

Water Supply Connection P27

Condensate Piping

P28

Temperature and Pressure Relief Valve

P29

Electrical Connection P30

Optional Remote Controller Installation P31~32

Plumbing Diagrams P33

Operating Instructions P34

How To Use The Front Control Interface P35

How To Use the Remote Controller P36

Maintenance and Service P37

"D" button Diagnostic Function

P38

Diagnostics P39~41

How To Check Gas Combustion

P42~43

Wiring and Connection Diagram P44

Grand Hall Limited Warranty P45~47

3

151140066151140067

190006019

1

Propane Gas Label

314070066

157010126

Mounting Bracket x2pcs

Wall Bracket x1pcs

1/4"x1

1

2

" screws x6pcs

Mounting Bracket Assembly

Intake Orifice 32

152140230

(for NG application
installing at elevation

1

Outdoor Venting
Cap

Concentric Kit

1

Item Description

Qty

P/N

Item Description

QtyP/N

314070074

ECHCVT01

Eternal Condensate

ECHNK01

Neutralizer Kit

1

Remote Controller
Kit

314070039

1

1

ECHNR01

Eternal Condensate
Neutralizer Refill

Water Heater
Stand

314080136

1

Item Description

Qty

273

Eternal Hybrid
Condensing

Water Heater

Operating and
Installation Manual
Registration Card

T&P Relief Valve

Drain Valve

Assembly

Mesh Screen

1

1

1

1

2

P/N

Item Description

QtyP/N

508111100

157290081

157140188

194140151

305070273

151140097

GU100

LP Orifice

1

1

T-Fitting

195140195

(for condensate line)

1

EC Adapter

312070025

1/2" Bushing

150290239

1

150150197

1

1

over 3,000 ft)

195140180

1

Hole Plug

1

Horizontal
Terminator 3"

151140130

3

Included Accessories

Optional Accessories

Self Tapping Screw

5/32" x 5/8" : 2pcs

151140066151140067

190006019

1

Propane Gas Label

314070066

157010126

Mounting Bracket x2pcs

Wall Bracket x1pcs

1/4"x1

1

2

" screws x6pcs

Mounting Bracket Assembly

Intake Orifice 32

152140230

(for NG application
installing at elevation

Item Description

Qty

273

Eternal Hybrid
Condensing

Water Heater

Operating and
Installation Manual
Registration Card

T&P Relief Valve

Drain Valve
Assembly

Mesh Screen

1

1

1

1

2

P/N

Item Description

QtyP/N

508111100

157290081

157140188

194140151

305070273

151140097

GU100

LP Orifice

1

1

T-Fitting

195140195

(for condensate line)

1

EC Adapter

312070025

1/2" Bushing

150290239

1

150150197

1

1

over 3,000 ft)

195140180

1

Hole Plug

Philips Head Screw

M8x15 : 4pcs

Stainless Steel Expansion Bolt

: 4pcs

4

Eternal Hybrid Water Heater Technical Specications

Model Name

GU100

Thermal Efciency (*) / Energy Factor

96% NG / 97% LP / 0.94 Energy Factor
Installation Indoor / Outdoor / Wall Hung / Floor Standing
Flue System Forced Exhaust Power or Direct Vent
Vent Run 3" PVC / 2" PVC Up to 100ft, 6 Elbows Max, 5ft Deduction Per Elbow / Up to 35ft,

3 Elbows Max, 5ft Deduction Per Elbow

(2"PVC Cannot be used at elevations above 4,000ft)
Condensate Discharge Low Fire / Med Fire / High Fire 0.5GPH / 1.1GPH / 1.75GPH
Condensate pH Level 4 pH
Gas Type Pre-set for NG / LP Conversion Kit Included
Unit Connections Gas / Water Fitting 1/2" Female NPT / 3/4" Female NPT

Electricity Dedicated 120VAC, 60Hz w/3 Pronged Power Cord
Gas Input Rate Min / Max 16,000 BTU/Hr / 100,000 BTU/Hr
Gas Supply Pressure NG / LP 3.5" WC to 10.5" WC / 8" WC to 14" WC
Manifold Pressure

(minimum)

Honeywell

NG (-) 0.01" W.C.
PG (

-

) 0.01" W.C.
Ignition System Direct electronic Ignition and Automatic Flame Sensing
Burner System Single Orice Fuel Injection/ Pre-mixing Metal ber Infrared Burner
Gas Valve System Single Stage Negative Pressure Full Modulation Air Ratio valve
Internal Piping Material PPS + Copper
Reserve Tank Under 2 Gallons
Electrical Consumption Standby 8W, Max 45W
Maximum Noise Level Under 35dB (a)
Remote Controller Up to 3 kits
Multi Unit Capable Up to 2 in manifold
GPM Capacity Range 0.1 to 10.0 GPM
Temperature Sensing Tank, Cold Inlet, Hot Outlet, Air Thermistors
Temperature Control

Simulation Feed Forward and Feed Back, Computer Controlled Mixing Valve

Flow Sensing Dual Flow Sensors w/Built-in GPM Monitor

Temperature Settings Range 100°F to 140°F in 5°F Steps

Unit Dimensions (WxHxD) 16.9" x 29.1" x 13.8"

Unit Weight 74.5Ibs

Safety Devices T&P Valve, Flame Rod, Thermal Fuse(306°F), Remaining Flame

Detection, Fan RPM Check, Freeze Protection(-40°F), Vent Blockage
Detection, Thermostat Switches(149°F / 194°F), Gas Valve Current
Leak Detection, Ignition Prevention, Dipswitch Temperature Lock, GFCI
w/2 x 5A Fuses.

*

GU100 is for single or dual unit applications with no multi control unit.

*

Maximum manifold pressure is indicated on the rating label on right side of the unit.

*

Independent DOE tested.

5

Dimensions - GU100 / 508(11,12,21,22)1100

6

Parts Diagram for Model GU100 / 508(11,12,21,22)1100

11

12

5

9

13

6

14

3

4

7

2

10

1

15

8

16

17

18

7

19

30

7

Parts Diagram for Model GU100 / 508(11,12,21,22)1100

8

KEY DESCRIPTION

1 Panel, Front Assembly

2 Panel, Top / Rear Assembly

3 Panel, Rear

4 Panel, Left Assembly

5 Panel, Right Assembly (GU100)

6 Panel, Bottom

7 Mounting Bracket

8 Wall Bracket

9 Controller / Front

10 T&P Relief Valve (Cash Acme)

11 Vent Collar

12 Vent Collar Packing

13 Rubber Foot

14 Drain Valve Assembly

15 Main Power Cord

16 Handle

17 Condensing Nipple

18 Mesh Screen

19 Outdoor Venting Cap (Optional)

20 Trap Cleaner Assembly

21 Radial Blower Assembly

22 Gas Valve

23 Air Pressure Switch (GU100)

24 Burner Assembly

25 Main Controller (GU100)

26 Cold Water Tube Assembly (GU100)

27 Hot Water Tube Assembly (GU100)

28 Flexible Silencer Kit

29 Mixing Valve

30 EC Adapter

31 Water Pressure Switch

Parts List for Model GU100 / 508(11,12,21,22)1100

9

Pre-Installation 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.

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.

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 inrm without
supervision.

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. Force 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 ammable liquids will explode and catch re 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

WARNING

WARNING

WARNING

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! !

10

Installation Preparation

Unpack the unit carefully and make sure that all 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 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. All water heaters can leak. Do not install without adequate
drainage provisions where water flow can cause property damage.
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.
Vent piping should slope downward towards the unit. Horizontal runs require adequate support at 3½ feet
intervals and vertical runs supported at 5 feet intervals.
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

●

●

●

●

●

●

●

●

●

●

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.

WARNING

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 ow.
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 and 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

CAUTION

! !

! !

11

Condensate Disposal

The condensate drain must be lled and unobstructed to allow ow of condensate. The condensate should not
be subjected to conditions where freezing could occur. If the condensate is subjected to freezing or obstruction, it
can leak, resulting in potential water damage to the unit and surrounding area.

The drain line material must be an approved material by the authority having jurisdiction. In absence of such
authority, PVC and CPVC piping must comply with ASTM D1785 or D2846. This pipe must be connected to the
port at the side panel. The end of the pipe should drain to a laundry tub or to a oor drain.

Over time, blockage of the trap by debris may occur; when the condensate cannot be released, the unit will go into
error and will shut down. When this occurs, the trap must be cleaned.

CLEANING OUT THE TRAP

The condensate trap must be lled with water prior to using the water heater.

Fill 3.0 oz. of water through the exhaust collar per gure 1.

Eternal water heater will typically produce a condensate that is considered slightly acidic with a Ph content of
approximately 3-4. Install a neutralizing lter if required by authority having jurisdiction (See gure 2).

Direct to drain from the unit.
Drain through neutralizer from the unit.
Drain to laundry tub from the unit, in this case the unit must be above the height of the laundry tub.
When installing a condensate pump, ensure the pump is approved for use with condensing appliance.
The pump should be equipped with an overow switch to prevent property damage from potential condensate
spillage.

1.

2.

3.

4.

CAUTION

Figure 2.

Figure 3.

NOTICE

NOTICE

□

To Remove Trap

1. Gently pull trap body downwards to remove.

2. Remove clip securing trap to the nipple.

! !

! !

! !

3 oz.

Figure 1.

4

1

2

3

1

2

1/2" PVC (SCH40, ASTM-D1785)

or

3/4" CPVC (SDR11, ASTM-D2846)

12

Indoor Installation

Clearances

From top of water heater 12 inches From back of unit 0.6 inch

From front of unit 6 inches (*) From left side of unit (gas piping side) 6 inches

From side wall ue or vent connector in any direction 6 inches From right side of unit 2 inches

GU100 can be used as either Power-Vent or Direct-Vent appliance. When used as a Power-Vent appliance, the
water heater should be located in an area where enough air is available for proper combustion and ventilation.
Follow the latest edition of ANSI Z223.1 and any of your local codes that are applicable.
GU100 is a Category IV vented appliance and manufacturer's ventilation specifications should be followed.
In general these requirements specify that if the unit is installed in a confined space, there must be permanent air
supply openings if Eternal isn't installed as Direct-Vent.

When combustion air is supplied directly through an outside wall such as intake louver 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.

When combustion air is supplied from inside the building, each opening should give a minimum free area of one
square inch per 3,750 Btu/hour of the total input ratings of all appliances in the enclosed area. These openings
should never be less than 40 sq.in.

The minimum required inside air volume should be 50 cu.ft per every 3,750 Btu/hour.

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Combustion Air Supply

Air supply from outside building:

Air supply from inside building:

Minimum Recommended Air Supply To Water Heater as Power-Vent

Model # Water Heater Capacity Outside Air Area Inside Air Area

GU100 Max. 100,000 Btu/hour 25 sq.in. 100 sq.in.

Model # Water Heater Capacity Minimum Required Air Volume

GU100 Max. 100,000 Btu/hour 1333 cu.ft

Air Vents

Heater

Air Vents

Heater

*

For accessibility when performing maintenance, 24" clearance in front of the unit it is recommended.

Natural gas in high altitude might contain less heating value than typical 1100 BTU/ cuft and therefore can cause
improper air / gas mix leading to improper combustion. For natural gas installations in altitudes above 3,000 feet,
be sure to apply the intake orice (P/N 152140230) provided by manufacturer in the accessory box.

WARNING - high elevation installations

! !

13

Outdoor Installation

Clearances

From top of water heater 24 inches From back of unit 0.6 inch

From front of unit 24 inches From left side of unit (gas piping side) 6 inches

From side wall ue or vent connector in any direction 6 inches From right side of unit 2 inches

If this unit is installed under an overhang, there must be a 24" clearance from the top of the unit to the overhang,
and the surrounding area must be open in front and on the sides of the unit.

For outdoor installation, do not remove the vent cap from the top of the appliance. Locate the water heater in an
open, unroofed area, and maintain the above minimum clearances from combustible materials.

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Exhaust Ventilation

Do not have the ue terminal pointing toward an opening into the building. Do not locate your heater in a pit or
any location where gas and water can accumulate.

WARNING

! !

Do not install the water heater where water, debris or ammable vapors may get into the ue terminal. This may
cause damage to the water heater.

WARNING

! !

Min. 4ft

Natural gas in high altitude might contain less heating value than typical 1100 BTU/ cuft and therefore can cause
improper air / gas mix leading to improper combustion. For natural gas installations in altitudes above 3,000 feet,
be sure to apply the intake orice (P/N 152140230) provided by manufacturer in the accessory box.

WARNING - high elevation installations

! !

14

Mobile Home Installation

Read and Review this entire Manual with special emphasis on the combustion and ventilation for your safety.
If you do not follow these instructions exactly, a re or explosion could result causing property damage, personal
injury or loss of life.

WARNING

! !

Eternal water heater must be used as sealed combustion type (Direct Vent) where all the combustion air is supplied
from the outdoors through the air intake and all combusted gas by products are vented directly to the outside by
means of the vent termination.

MOBILE HOME(Manufactured Home).

This appliance must be installed in accordance with the Manufactured Home Construction And Safety
Standard,(Title 24, CFR; Part 3280). In addition, install in accordance with the following instructions, the instructions
supplied with the venting termination, local codes, utility company requirements for the installation of water heaters
in manufactured homes (mobile homes). In the absence of such a standard, the water heater should be installed
in accordance with the latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and ANSI A119.5/NFPA
501D.

LOCATION for MOBILE HOME(Manufactured Home).

Per code, water heaters must be installed with a sealed combustion design so as to separate the water heater's
combustion and venting system from the interior atmosphere of the manufactured home. In accordance with code ­water heaters must be direct vented. Please refer to direct venting instructions and diagrams on page 19.

Placement of Water Heater: Locate the water heater as desired, make certain the minimum clearances are
maintained. For indoor and outdoor installation follow entire Eternal operation manual, please see section above on
manufactured home and recreational park trailer outdoor installation.

When installing in a garage, the heater's ignition source should be elevated no less the 457mm (18") from the oor
unless the ooring is listed as being resistant to the ignition of ammable vapors.

Operations Manual should be attached to the unit after installation.

EC Adapter Installation

□

How to install the EC Adapter

Loosen M10 screw.
Insert the combustion probe.
After test, retighten M10 screw on the EC Adapter
and make sure no leak.

How to test exhaust combustion air

1.

2.

3.

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EC Adapter

M10 Screw
(Test Hole)

combustion probe

M10 Screw

O Ring

Note: It is not necessary to glue the EC Adaptor into the top of the unit, but when installing PVC vent pipe into EC

Adaptor it is recommended you glue the PVC into the EC Adaptor.

For outdoor installation, please install EC Adapter to check gas setting prior to install outdoor venting cap or
PVC vent pipe.

Note:

15

Wall Mounting

Mounting Steps

1. Install mounting brackets with 6 screws on top and bottom back of the unit.

Select a location on the wall to mount the unit. The included wall bracket has been pre-drilled for easy installation
on standard stud walls. If the framing is not standard or installing on an uneven surface, fasten 3/4" plywood to
the stud wall and then attach the wall bracket.

Hang the unit on the mounted wall bracket and secure bottom of the unit to the wall with included wall anchors
and wall screws.

2.

3.

1/4"x1 ½" Screws

The water heater must be properly supported; if the wall is not strong enough, be sure to reinforce the wall.
The unit must be mounted on a vertical wall and level to the ground.

WARNING

! !

Philips Head Screws
1/4"x3/8"

Philips Head Screws
1/4"x3/8"

1/4"x1 ½" Screws