Eternal GU145, GU145(S), GU195(S), GU195(M) Installation And Operation Manual
Service Information Center:
Call us fi 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 damaged or missing parts when you unpack this unit from the shipping
box. Please call before returning to the store.
1-866-946-1096
7am-7pm CST, Monday through Friday
157140081 Date 2010/6/17
Installation ● Operation Manual
Natural Gas (NG) - Factory Default
Liquid Propane Gas (LPG) - Optional Ori ce
Model GU145 (S) / 508(11,12,21,22)1145 (S)
Model GU195 (S) / 508(11,12,21,22)1195 (S)
Model GU195 (M) / 508(11,12,21,22)1195 (M)
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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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 a re or 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
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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 #
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(see silver CSA label on Gas Water Heater)
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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 can 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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Table of Contents
Included & Optional Accessories P3
Specifications P4
Dimensions P5
Parts & Service Parts List P6~10
Pre-Installation Instructions for Your Safety P11
Installation Preparation P12
Condensate Disposal P13
Indoor & Outdoor Installation P14~15
Mobile Home Installation P16
Wall & Floor Mounting P17~18
Venting Intake & Exhaust Material P19
Direct and Power Venting P20
Vertical & Horizontal Termination P21~22
Multiple Units Termination P23
Common Venting Installation
mon Vent Installation
P24
Concentric Vent Kit & Outdoor Vent Kit Installation P25
Vent Pipe Installation & Terminator Position P26
Gas Supply Piping P27
LP Conversion P28
Water Supply Connection P29
Condensate Piping P30
Temperature and Pressure Relief Valve & Recirculation Pump Connection P31
Electrical Connection P32
Optional Remote Controller Installation P33~34
MCU Installation P35~37
Plumbing Diagrams P38~42
Eternal Hybrid Water Heater Installation Checklist P43
Operating Instructions P44
How To Use The Front Control Interface P45
How To Use the Remote Controller P46
Maintenance and Service P47
Diagnostics P48~50
Checking Gas Combustion Specifications P51
Wiring and Connection Diagram P52~53
Grand Hall Limited Warranty P54
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Included Accessories
Optional Accessories
0.75mm*2C
Wire
Hole Plug : 1pcs
Self Tapping Screw
5/32" x 5/8" : 2pcsCap : 2pcs
Philips Head Screw
M8x15 : 4pcs
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Eternal Hybrid Water Heater Technical Speci cations
Model Name
GU145 / GU145(S) GU195(S) / GU195(M)
Thermal Ef ciency / Energy Factor 98% NG / 99% LP / 0.96 Energy Factor
Installation Indoor / Outdoor / Wall Hung / Floor Standing
Flue System Sealed Combustion Direct Vent / Power Vent Convertible
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
Condensate DischargeLow 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 and Water 3/4" Female NPT
Electricity Dedicated 120VAC, 60Hz w/3 Pronged Power Cord
Gas Input Rate Min / Max 31,000 BTU/Hr / 145,000 BTU/Hr 31,000 BTU/Hr / 199,000 BTU/Hr
Gas Supply Pressure NG / LP 3.5"WC to 10.5"WC / 8"WC to 14"WC
Manifold Pressure Min / Max 0.1"WC / 1.7"WC 0.1"WC / 3.2"WC
Ignition System Direct Electronic Ignition w/Automatic Flame Sensing
Burner System Single Ori ce Premixed Fuel Injection Metal Fiber Infrared
Gas Valve System Dual Stage Negative Pressure Full Modulation Air Ratio
Internal Piping Material Standard - Copper / S Option - 316L SS / M Option - 316L SS + MCU
Reserve Tank Under 2 Gallons
Electrical Consumption Standby 8w, Max 51w Standby 8w, Max 91w
Maximum Noise Level 40dB (a) 50dB (a)
Remote Controller Up to 3 kits
Multi Unit Capable Up to 2 in manifold, No Built - In MCU / M Option - MCU up to 8 Units
GPM Capacity Range 0.1 to 14.5 GPM 0.1 to 19.5 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 180°F in 5°F Steps, Factory Limited to 140°F
Unit Dimensions (WxHxD) 16.9" x 29.1" x 13.8"
Unit Weight 96Ibs / M Option - 97Ibs
Safety Devices T&P Valve, Flame Rod, Thermal Fuse(306°F), Remaining Flame
Detection, Fan RPM Check, Freeze Protection(-4°F), Vent Blockage
Detection, Thermostat Switches(167°F / 203°F), Gas Valve Current
Leak Detection, Ignition Prevention, Dipswitch Temperature Lock, GFCI
w/2 x 5A Fuses.
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2"PVC Cannot be used at elevations above 4,000ft
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Dimensions - GU145(S) / 508(11,12,21,22)1145(S)
GU195(S,M) / 508(11,12,21,22)1195(S,M)
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Parts Diagram for Model GU145(S) / 508(11,12,21,22)1145(S)
GU195(S,M) / 508(11,12,21,22)1195(S,M)
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Parts Diagram for Model GU145(S) / 508(11,12,21,22)1145(S)
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KEY DESCRIPTION
1 Panel, Front Assembly
2 Panel, Top / Rear Assembly
3 Panel, Rear
4 Panel, Left Assembly
5 Panel, Right Assembly (GU145(S))
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 Plug
19 Mesh Screen
20 Outdoor Venting Cap (Optional)
21 Trap Cleaner Assembly
22 Radial Blower Assembly
23 Gas Valve Assembly
24 Air Pressure Switch (GU145(S))
25 Burner Assembly
26 Main Controller (GU145(S))
27 Cold Water Tube Assembly (GU145(S))
28 Hot Water Tube Assembly (GU145(S))
29 Flexible Silencer Kit
Parts List for Model GU145(S) / 508(11,12,21,22)1145(S)
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Parts Diagram for Model GU195(S) / 508(11,12,21,22)1195(S)
Parts Diagram for Model GU195(M) / 508(11,12,21,22)1195(M)
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Parts List for Model GU195(S,M) / 508(11,12,21,22)1195(S,M)
KEY DESCRIPTION
1 Panel, Front Assembly
2 Panel, Top / Rear Assembly
3 Panel, Rear
4 Panel, Left Assembly
5 Panel, Right Assembly (GU195(S,M))
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 Plug
19 Mesh Screen
20 Outdoor Venting Cap (Optional)
21 Trap Cleaner Assembly
22 Radial Blower Assembly
23 Gas Valve Assembly
24 Air Pressure Switch (GU195(S,M))
25 Burner Assembly
26 Main Controller (GU195(S,M))
27 Cold Water Tube Assembly (GU195(S,M))
28 Hot Water Tube Assembly (GU195(S,M))
29 Flexible Silencer Kit
30 Air Ratio Valve (GU195(M))
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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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12
Installation Preparation
Unpack the unit carefully and make sure that all accessories are put aside so that 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
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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 or 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 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
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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 obstructed, 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 D2845. This pipe must be connected to the
port at the side panel. The end of the pipe should drain to 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.
CLEAN OUT OF TRAP
The condensate trap must be lled with water prior to using the water heater.
Fill 3.0 oz. water through exhaust collar per gure 1.
Eternal water heater will typically produce a condensate that is considered slightly acidic with a Ph content
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 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.
3/4” PVC pipe
Figure 3.
NOTICE
NOTICE
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To Remove Trap
1. Gently pull trap body downwards to remove.
2. Remove clip securing trap to the nipple.
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3 oz.
Figure 1.
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Indoor Installation
Clearances
From top of water heater 12 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
GU145(S) / GU195(S,M) can be used as either Power-Vent or Direct-Vent appliance. When used as a PowerVent 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.
GU145(S) / GU195(S,M) 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 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.
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
GU195 (S,M) Max. 199,000 Btu/hour 14 sq.in. 54 sq.in.
GU145 (S) Max. 145,000 Btu/hour 10 sq.in. 40 sq.in.
Model # Water Heater Capacity Minimum Required Air Volume
GU195 (S,M) Max. 199,000 Btu/hour 2650 cu.ft
GU145 (S) Max. 145,000 Btu/hour 1930 cu.ft
Improper installation can cause nausea or asphyxiation from carbon monoxide and ue gases which could result
in sever injury or death. For installation in altitudes above 4,500 feet, contact the manufacturer for installation
instructions.
WARNING
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Air Vents
Heater
Air Vents
Heater
15
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
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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
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Improper installation can cause nausea or asphyxiation from carbon monoxide and ue gases which could result
in severe injury or death. For installation in altitudes above 4,500 feet, contact the manufacturer for installation
instructions.
WARNING
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Min. 4ft
16
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
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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) and RECREATIONAL PARK TRAILERS.
This appliance must be installed in accordance with the Manufactured Home Construction And Safety
Standard,(Title 24, CFR; Part 3280) and ANSI A119.5 for Recreational Park Trailers. 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) and
Recreational Park Trailers. 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).
This water heater must be installed within an enclosure so as to separate the water heater’s combustion and
venting system from the interior atmosphere of the manufactured home and trailer. All air for combustion must be
obtained from the outside atmosphere. And the by products of combusted gases ( ue gases) must be discharged
directly to the outside atmosphere through the gas vent. There must not be any door or other opening into the water
heater enclosure from the inside of the manufactured home. Please refer to installation diagrams (Page 21).
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 of
manufactured home and recreational park trailer outdoor installation.
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Wall Mounting
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.
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.
WARNING
1/4"x1 ¼" Screws
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Wall Mounting For Commercial Food Service
Per ANSI / NSF-5, the unit must be mounted at least 6" above the oor from the base of the unit.
This mounting clearance provides access for clearing any possible debris or accumulated water seepage that can
occur below the unit.
Philips Head Screws
1/4"x3/8"
Philips Head Screws
1/4"x3/8"
1/4"x1 ¼" Screws
6"
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