Marey GA30NG User manual

Keep this manual with you after your unit has been installed.
You may need it for further technical information.
GAS TANKLESS WATER HEATER
INSTALLATION AND
OPERATION MANUAL
USA [phone] PR [phone]www.marey.com
GAS 30L
NG/LP GAS

Congratulations! You've just purchased a new Marey Gas Powered Tankless Water Heater
and will soon begin to enjoy the benets of "going tankless."
The availability of instant hot water, combined with the unit's outstanding energy efciency
and space saving design, will quickly prove you that you've made the best decision for
meeting your home's hot water needs.
Take the time to thoroughly read and understand this safety and installation manual in its
entirety before you attempt to install your new gas powered tankless water heater, as it
contains important safety tips and instructions.
Please carefully read all instructions and warnings. Should you have any questions, please
visit www.marey.com for installation videos and FAQ. Please keep this manual for future
reference.
WARNING: This unit should be installed by a certied professional in accordance with all
local building and plumbing codes. Under no circumstances should you attempt to install,
repair, or disassemble the Marey Gas Powered water heater without rst shutting off any gas
supplied to the unit.
WARNING: If the information in these instructions is not followed exactly，a re or explosion
may result causing property damage, personal injury or death.

INDEX
INTRODUCTION AND SAFETY WARNINGS
INTRODUCTION
IMPORTANT SAFETY INSTRUCTIONS
SAFETY WARNINGS
OPERATION
OPERATING INSTRUCTIONS
EXTENDED SHUTDOWN
COLD WEATHER WARNINGS
TROUBLESHOOTING
DIAGNOSTIC CODES
INSTALLATION
INSTALLATION GUIDELINES
PACKING LIST
LOCATION AND CLEARANCE REQUIREMENTS
ELECTRICAL
GAS PIPING
AIR INTAKE AND EXHAUST (VENT) SYSTEM
START UP AND TESTING
REFERENCE
WIRING DIAGRAMS
SYSTEM SPECIFICATION
DIMENSIONS
NAMES OF MAJOR PARTS AND COMPONENTS
SPARE PARTS
LIMITED WARRANTY
04
04
04
05
06
07
10
12
15
17
19
19
20
21
24
24
25
33
35
35
36
37
38
40
41

IMPORTANT: KEEP THIS MANUAL FOR FUTURE REFERENCE!
Thank you for purchasing this Marey tankless water heater.
In order to ensure proper installation, safe operation, and long life, please carefully read
these instructions. Installation should only be completed by licensed professionals. The use
of professionals ensures the installation is in full compliance with all required building,
plumbing and electrical codes.
Keep this manual for future reference. This booklet includes useful information about the
product, maintenance requirements and the details of your product warranty.
1.1 INTRODUCTION
READ AND FOLLOW ALL INSTRUCTIONS.
When using this equipment, basic precautions should always be followed.
SAFETY DEFINITIONS
This symbol is the safety alert symbol which is used to alert you to
potential hazards that can kill or hurt you and/or others.
Indicates an imminently hazardous situation which could result in
death or serious injury.
Indicates a potentially hazardous situation which could result in
death or serious injury.
Indicates a potentially hazardous situation which could result in
minor or moderate injury. It may also be used to alert against
unsafe practices.
1.2 IMPORTANT SAFETY INSTRUCTIONS
1. INTRODUCTION AND SAFETY WARNINGS
04

05
DO NOT use a fuel gas that is not listed on the nameplate as compatible with the water heater.
Abnormal combustion or a deagration may occur which can cause a serious accident.
DO NOT use the unit if the vent piping has been damaged or altered in any way including
cracking, separation, rusting, melting, etc. Improper venting may cause a buildup of Carbon
Monoxide (CO) which can cause brain damage or death.
·If the water heater needs to be installed, moved, or serviced only utilize licensed professionals.
The use of professionals ensures all work is in full compliance with required building, plumbing
and electrical codes.
· Keep the area around the appliance clear and free of ammable materials such as cloth, wood,
aerosol cans, paper, gasoline, etc.
·When using hot water for a shower or bath always check the water temperature before entry to
avoid being scalded. Obey local codes for the maximum water temperature setting allowed.
Water temperatures over 125ºF (52ºC) can cause severe burns or death from scalds. Households
with small children, disabled or elderly persons may require a setting of 120ºF (49ºC) or lower.
·This heater is designed only for the heating of water and should not be used for other applica-
tions or used to heat any other media.
·Never use a fuel gas that is not listed on the nameplate as compatible with the water heater.
Abnormal combustion or a deagration may occur which can cause a serious accident including
damage to the heater.
·Do not use this appliance if any part has been under water. Consult a qualied service techni-
cian to inspect the appliance and make any required repairs prior to installation and operation.
·This water heater is designed for indoor mounting. Never mount it outdoors.
·This equipment should be installed in an area where water leakage from the unit or connections will
not result in damage. The manufacturer is not responsible for any damages resulting from leaks.
·Only connect gas and water as instructed. Incorrect or reversed connections will cause
equipment damage and will not be covered under product warranty.
·Do not over tighten connections or equipment may be damaged.
·Do not install in areas that are subject to vibration.
·This equipment shall not be operated without the vent pipe properly connected. The exhaust
pipe must not terminate in an area where the exhausting vapor or collecting condensate could
create a hazardous situation or cause property damage. Exhaust gases must be vented out of
the building in compliance with all building codes.
·The exhaust piping is very hot during and for a period after use. Do not touch the pipe.
·Ensure that snow, ice or other debris does not block the inlet or exhaust pipes.
·Regular housekeeping should be done in areas around the heaters to prevent insect
intrusion and possible equipment malfunction.
·The unit should be serviced on a routine basis to ensure optimum performance. Service needs
will vary based on local water conditions including acidity, alkalinity, hardness, etc.
·Freezing temperatures will cause damage to the heater. Install in locations where freezing temperatures
are not reached and follow procedures to drain the unit if it will be out of service for a period of time.
FREEZE DAMAGE IS NOT COVERED UNDER THE PRODUCT WARRANTY
1.3 SAFETY WARNINGS

·A 120 V / 60 Hz power source should be used. Fire, electrical shock or damage to the water
heater may occur if an incorrect power supply is used.
·This appliance is equipped with a three-prong grounded plug for increased protection against electrical
shock. Ensure the plug is properly inserted into a clean, dry outlet that complies with all electrical codes. Only
insert and remove the plug using the plug head and never use a wet hand to plug or unplug the power plug.
·Any alterations to the appliance will void the warranty unless instructed by a Marey technical
support representative with an original spare part supplied by Marey.
·Should overheating occur or the gas supply fails to shut off, turn off the manual gas control
valve to the appliance
·Do not use this appliance if any part has been under water. Immediately call a qualied service
technician to inspect the appliance and to replace any part of the control system and any gas
control which has been under water.
·Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause
improper and dangerous operation.
·Verify proper operation after servicing.
06
2. OPERATION
Gas tankless water heaters provide an efcient reliable supply of hot water.
The temperature can be adjusted between 35°C - 60°C (95°F - 140°F).
Only a small amount of water and a low water pressure (15psi) are required for the unit. Unit requires 0.67
gpm (2.5 l/min) to enable the unit. Unit stays in operation until the ow drops below 0.53 gpm (2 l/min).
The burner ignition is electronic. The unit has no pilot light and consumes no gas when the
heater is not being used.
The unit’s integrated control system constantly monitors the temperature of the water being
produced and adjusts the burner accordingly to deliver a stable supply of hot water.
The unit is highly exible and provides hot water over a wide range of ow rates and incoming
water temperatures across the capacity range of the unit.
Keep the combustion air vent pipe location free of chemicals, such as chlorine or bleach, that
produce fumes. These fumes can damage components and reduce the life of your appliance.
Damage and repair due to scale in the heat exchanger is not covered by warranty.
Always check the water temperature before entering a shower or bath.
Do not adjust the parameter settings unless specically instructed to do so.
This Marey water heater includes convenient H2O Saver Technology™, a digital functionality that
allows owners to control hot water consumption and conserve water.
DESCRIPTION OF OPERATION

WARNING : If you do not follow these instructions exactly, a re or explosion
may result causing property damage, personal injury or loss of life.
FOR YOUR SAFETY READ BEFORE OPERATING
07
NORMAL OPERATION
This section of the manual instructs an owner on routine operating procedures and assumes
that the water heater has already been installed, tested, and approved for operation. Initial start
up requirements are detailed in the “Installation” section of this manual.
ROUTINE START UP
Follow this procedure for a heater that has been out of service.
OPERATING INSTRUCTIONS
Multiple protective functions are included such as no-load heating prevention, automatic
shutdown in case of accidental ameout, automatic pressure relief, etc. to make the appliance
both safe and reliable
A. This appliance does not have a pilot. It is equipped with an ignition device which automatically
lights the burner. Do not try to light the burner by hand.
B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the
oor because some gas is heavier than air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS
· Do not try to light any appliance.
· Do not touch any electric 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.
C. Use only your hand to operate. Never use tools. If the appliance does not operate properly, don’t try
to repair it, call a qualied service technician. Forced or attempted repair may result in a re or
explosion.
D. Do not use this appliance if any part has been under water. Immediately call a qualied
service technician to inspect the appliance and to replace any part of the control system and any
gas control which has been under water.
2.1 OPERATING INSTRUCTIONS

08
1. Shut down the water heater by pressing the “ON/OFF” button.
2. Close the fuel gas valve.
3. Unplug the power cord
4. Use dry hands. Exercise caution and only unplug by grasping the plug head and pulling. Note,
all factory settings will be restored next time the unit is turned on.
1. Close the water inlet valve.
2. Open all hot water faucets.
3. Obtain an appropriate container to collect the residual water from the system.
4. Turn off all electric power to the appliance if service is to be performed.
TO TURN OFF GAS TO APPLIANCE
CONTROL PANEL
The Control Panel and display are used to adjust the operational settings of the unit as well as give
information about the current state of operation. The following illustration shows all possible
symbols and signs that may appear in various states of operation. In operation only the symbol or
sign corresponding to the actual state will appear on the control panel display. The water heater
is in an operating state when the hot water temperature is shown.
Figure 1- Control Panel Diagram

09
CONTROL PANEL INDICATIONS
LED display
1. Power on press the POWER key, the water heater is in the startup state. At this time, the
temperature display displays the current set temperature, the temperature setting range is
35ºC~ 60 ºC(95F-140F), and the factory default setting temperature is 42ºC.
2. The water heater can be used in three modes, including “Auto”, Bath” and ECO”. The factory
default is AUTO mode.
"AUTO mode": the water heater automatically matches the best operation state according to the
temperature needs set by the user.
"Bath mode": the user can set the water injection volume and set the temperature in the bath
mode. When the current water injection volume of the water heater reaches the set value, the
buzzer of the water heater will make a sound to remind the user to turn off the water. In bath
mode, the default setting temperature is 50ºC; Set the temperature to increase or decrease by
1ºC each time. The default water volume is 40L, the water volume setting range is 40L ~ 980l,
and the set water volume increases or decreases by 20L each time.
"ECO mode": the water heater can save more gas than under the ordinary mode.
3. "Flame icon": indicates the current working state of the water heater. When the ame icon is
always on, it indicates that the water heater is in working state. When the ame icon is not on, it
indicates that the water heater is in standby or fault standby state.
"WiFi icon": indicates the current networking status of the water heater. When the WiFi icon is
always on, it indicates that the water heater is successfully networked. When the WiFi icon is not
on, it indicates that the water heater is disconnected.
"Fan icon": indicates the current state of the water heater fan. When the fan icon ashes
dynamically, it indicates that the water heater fan is in operation. When the fan icon is not on, it
indicates that the water heater fan is in static state.
"Water ow icon": indicates the water ow status in the water heater. When the water ow icon
ashes dynamically, it indicates that the water in the water heater is in circulation. When the
water ow icon is not on, it indicates that the water heater is in the state of water cut-off or too
small water ow.
“+” and “-” key: used to set the water temperature or set the water injection volume in the bath
mode. Each time you press the “+” and “-” key, set the temperature to increase or decrease by
one degree, and set the water injection volume to increase or decrease by 20L each time. If you
need to quickly set (temperature or water injection), you can continuously increase or decrease
by long pressing the “+” and “-” key.

10
Mode selection button: the user can select and set the current mode through the mode selection button.
With each click, the water heater exits the current mode and enters into the next working mode.
POWER key: used to control the shutdown / standby / fault reset and other working states of the
water heater.
POWER OUTAGE
In the event of a power outage or if the unit is unplugged, settings are restored to their factory
default values.
2.2 EXTENDED SHUTDOWN
EXTENDED OUTAGE PROCEDURE
If a heater will be out of service for an extended amount of time, use the following procedure to
protect the unit.
SCALD PREVENTION
· Water temperatures over 125ºF (52ºC) will scald and can instantly
cause severe burns or death!
· Children, disabled and elderly are at highest risk of being scalded
· Always test the water temperature by feeling the water prior to
entering a shower, bath, etc.
· Obey all codes regarding temperature set point.
· Contact a licensed plumber or local plumbing authority for
clarication or additional information.
IMPORTANT!
The volume measurement only keeps track of the water volume
that passes through the water heater. For example, if hot water
going to a tub is combined with cold water, the volume computed
would not be representative of the total amount that may have lled
the tub. This could lead to an overow or damage!
*Cold air may enter the unit through the air intake or the exhaust system. Take precaution
for extended shutdowns even if unit is installed indoors in an area that does not allow
direct exposure to freezing temperatures.
*Temperatures at or below 0°C (32°F) can cause permanent damage the unit and/or the
piping system due to freezing.
*After a power outage, all settings return to their factory default values.
NOTES

11
The heater and water within the unit may be very hot. Allow time
for the system to cool and use caution when draining to minimize
risk of injury.
1.Shut down the water heater by pressing
the “ON/OFF” button.
2. Close the fuel gas valve (1).
3. Unplug the power cord (3).
4. Use dry hands. Exercise caution and only
unplug by grasping the plug head
and pulling. Note, all factory settings will be
restored next
5. Close the water inlet valve. (4)
6. Open all hot water faucets.
7. Obtain an appropriate container to collect
the residual water from the system.
Prevent water from being discharged on the oor to avoid damage.
Prevent water contact with any electrical source in the vicinity.
1.Open the drain plugs and completely drain the water heater.
2.Continue draining to empty the whole hot water system.
Note: Freezing temperatures below 0°C (32°F) can cause permanent damage to the heater
and/or the piping system.
3.Reinstall the drain plugs and close the hot water faucets.
4.To return a unit to operation, please refer to “Routine Start Up” found in the Operating
Instructions section of this manual.
Figure 1- Drain plug lacation

12
2.3 COLD WEATHER WARNINGS
FREEZING DAMAGE POTENTIAL AND PRECAUTIONS
Freezing temperatures can damage the water heater and/or water piping. Freezing water
expands rapidly and can create tremendous mechanical forces. Mechanical damage and pipe
ruptures can result from only brief exposure to freezing temperatures.
For best results, completely shut down the system by following the Extended Outage Proce-
dure section of this manual.
In cold regions, insulating material or heat tracing can be used to protect pipes and ttings.
Please consult your dealer if necessary.
COLD WEATHER WITH POTENTIAL FREEZING TEMPERATURES
Keep water owing through the system to guard against freezing.
Follow these steps:
1. Close the fuel gas valve.
2. Turn off the power by pressing the “ON/OFF” button.
3. Open the hot water faucet at one or more points of use (sink, upstairs bathtub, etc.)
Maintain a constant trickle. Monitor the stream of water to ensure it is still owing.
NO FLOW DUE TO EXPECTED FROZEN HEATER
1. Close both the fuel gas valve and the water inlet valve.
2. Turn off the power switch.
3. Open a hot water faucet.
4. Open the water inlet valve now and then to check for a water ow.
5. If no ow, attempt to thaw heater by using a portable heat source such as a hair dryer or
portable electric heater.
6. Check occasionally to see if water ow has started.
7. When water ow resumes, carefully check for any signs of water leakage.
8. Resume normal operation
WARRANTY
Damage caused by freezing is NOT covered by Warranty.
To prevent damage, NEVER force a heater to operate while in a
frozen state. NEVER bypass any safety feature.

13
MAINTENANCE AND INSPECTION
ROUTINE INSPECTION
To keep your water heater operating optimally please refer to the below recommended
inspection and maintenance checklists. Marey recommends a periodic inspection performed
by a qualied service technician. An annual inspection is normally sufcient. Frequent visual
inspections by the owner are recommended. Any repairs should be performed by a qualied
service technician using only factory authorized components.
ROUTINE INSPECTION CHECKLIST
Any ammable materials in the vicinity of the water heater or exhaust piping?
Any unusual noises coming from the heater while in operation?
Are the air intake and exhaust free from any blockage or foreign objects?
Signs of water leakage around the water heater or pipes?
Any signs of water leaking near heater or pipes?
Any abnormal appearance to unit casing?
MAINTENANCE CHECKLIST
Clean outside of unit and control panel
Use a wet cloth to remove any surface dirt. Use a dry cloth to wipe it dry.
A very mild detergent may be used if unit is very dirty.
Never use any petroleum based cleaners or solvents. These solvents can damage the
panel.
Check and clear Air Intake of any debris that might impede air ow.
Clean inlet water screen
Examine venting system
Clean inside of unit by vacuuming or blowing out dust that collects in the unit. Do not
open the burner this cleaning should only be done by authorized service personnel.
Visual ame inspection
Lime scale cleaning
The heater and exhaust piping will be hot during and shortly after
use. Use caution when working in the area around the heater.

14
MAINTENANCE PROCEDURES
BURNER INSPECTION AND CLEANING
1. The burner must ame evenly over the entire surface of the burner head when operating
correctly.
2. The ame should burn with a clear, blue, stable ame.
3. Presence of a yellow ame or of black deposits on the burner head indicates cleaning
and/or burner replacement should occur.
MAINTENANCE BLOWER
1. The fan motor is permanently lubricated and does not require periodic lubrication.
2. If the motor fails, it must be replaced by a qualied technician only.
PURGE THE PRESSURE RELIEF VALVE
If a pressure relief valve discharges periodically, this may be due to thermal expansion occur-
ring in a water supply system in a closed circuit. Contact the water supplier or local plumbing
inspector for the best way to solve this problem. Do not block the pressure relief valve.
LIME SCALE CLEANING PROCEDURE
Materials required:
· Five gallon container
· Four gallons of virgin food grade white vinegar or virgin food grade citric acid
· Small inline recirculation pump capable of circulating 2 - 4 gpm (8 – 16 l/m)
· Set of hoses for connecting recirculation pump to and from the pump and the ve gallon container.
Refer to the diagram on the next page to complete this procedure.
1. Disconnect electrical power to the water heater.
2. Close the shutoff valves V3 and V4 on both the hot water and cold water lines.
3. Connect a hose H1 form the pump outlet to the cold water line V2 into the heater.
4. Connect drain hose H2 from the hot water outlet line V1 and route into ve gallon recircula-
tion container.
5. Pour approx. four (4) gallons of virgin, food grade,white vinegar or citric acid into pail.
6. Place the pump suction hose H2 into the cleaning solution
7. Open valves V1 and V2 into the water heater.
8. Operate the pump. Circulate the cleaning solution through the water heater for at least 45 minutes.
9. Turn off the pump.
10. Rinse the cleaning solution from the water heater by closing valve V2 and opening valve V4,
ow water through the heater and into a container or drain for at least ve minutes.
11. Close Valve V1 and Open Valve V3 this places the house back online.
12. Disconnect all hoses.
13. It is also wise to clean the water inlet screen at this time. Close Valve V3 and V4 to do so.
Clean the water inlet screen and remove any debris.
14. Replace the screen and open valves V3 and V4 once more. Checks for leeks.
15. Return heater to operation by following start up instructions.

15
ELECTRICAL MAINTENANCE WARNINGS
Label all wires prior to disconnection when serving controls. Wiring
errors can cause improper and dangerous operation. Always verify
proper operation after servicing.
2.4 TROUBLESHOOTING
For operating difculties with your unit, please consult he following table for guidance. If you
need further assistance, call Marey toll free service and support line at 1-855-627-3955.
Please have product information ready when you call including serial number, date
of purchase and error code if shown on the control panel.
Note: Please check water heater for an error code and respond according to recommendations
found in “Error Codes” portion of this manual.

16
Issue
Possible Cause
Solu�on
No power: Power
indicator lamp is not lit
Power outage
Unit requires 120V power. Use unit when
power is restored.
Check circuit breaker and reset if needed.
Check ground fault circuit interrupter (GFCI)
if circuit includes one and reset if necessary.
Unit is unplugged
Check power plug and ensure properly plugged.
Plug the power plug properly.
There is no hot water
ow when a hot water
faucet is opened.
No/empty fuel source
Water valve closed
Power outage
Flow is too low or became
too low. (less than 0.66
gallons per minute (gpm) or
2.5 liters per minute (l/m)
Freezing temperatures may
have frozen water in the
heater or hot water system.
Fuel gas meter special
control restricons
Distance from heater to
source is long
Fuel gas valve needs to be open
Rell source tank (if applicable)
Open the water inlet valve.
Unit requires 120V power to operate.
Flow is below the lower limit necessary for
stable burner operaon and proper
temperature control. Increase the hot water
ow to enable system.
See “No Flow Due to Expected Frozen
Heater” secon of this manual for procedure
to thaw unit.
Some fuel gas valves may have special
restricons or digital controls that use.
Consult your gas supplier and/or a service
professional for assistance.
Allow me for hot water to travel through
system to reach the point of use.
Issue
Possible Cause
Solu�on
Hot water is not the
right temperature
(too hot or too cold)
Temperature set point was
reset due to power outage.
Flow is beyond capacity
Incoming water is too warm
Power outage restores default sengs and
custom set points must be re-entered to unit
Desired water ow is above maximum
capacity of unit. Reduce user ows to re-
establish control of temperature
If incoming water to unit is very warm and
the ow is just above minimum
requirements, the heat generated by the
burner while operang at minimum capacity
can make the water hoer than desired.
Increase the hot water user ow so that the
burner system can control the temperature.
Hot water ow
produced is lower than
expected
Water source is restricted
Heat exchanger in unit is
scaled
Incoming water temperature
Check and fully open water inlet valve(s)
Check and clean inlet water screen
Clean heat exchanger by ushing per
maintenance procedure.
Colder than normal incoming supply water

17
2.5 DIAGNOSTIC CODES
Whenever a failure occurs, an alert sounds and a diagnostic code is displayed to indicate the
failure mode at the time of occurrence.
Figure 1 - Control Panel
Example- Displaying Error
Code E2
The hot water coming
appears white and
turbid.
Small bubbles may appear
when water is heated. Air
dissolved in water may
evolve when water is
heated.
None. Normal operaon.
Issue
Possible Cause
Solu�on
Vent system trouble
Vent system is restricted in
some manner.
Check air intake and exhaust ducts to ensure they are
not damaged, corroded, blocked,
etc.
“Smoke” observed
coming from exhaust
system during cold
temperatures
Water vapor produced
during combuson is
condensed in the exhaust as
the hot gas is cooled by the
outside air.
None. Normal operaon.
Water leaking from
safety valve outlet
Water system is operang
above design pressure.
Safety valve is damaged.
Consult professional for system review.
Replace safety valve. Consult professional as
required.
Blower fan noise can
be heard for some me
aer operaon stops.
The blower is designed to
run for 30 seconds aer
burner shuts o.
None. Normal operaon
The volume alarm does
not sound even though
the volume appears to
be adequate
Units incorrect during input
Measuring ow of only hot
water instead of hot water
and cold water combined
Refer to “H2O SAVER TECHNOLOGY™ - Set a
Desired Volume” secon to ensure units
(metric vs. English) and volume (displayed
volume number represents 1/10th of the actual total
ow) are correctly set.
The volume measurement only keeps track of
the water volume that passes through the
water heater. If hot water going to a tub is
combined with cold water, the volume
computed would not be representave of the
total amount that may have been dispensed.
Unresolved problem Other assistance required
Consult Marey or contact an authorized service
professional.

18
The following table includes a list of diagnostic codes that can be displayed as well as recommended
Error Code
Possible Cause
Solu�on
E0
Outlet water temperature sensor
failure
Contact a dealer or qualied service technician
E1
Ignion failure
Check the gas pressure, no gas or gas pressure lower
Press the ON/OFF to Reset;
Contact a qualied service technician
E2
Flame failure(during working)
Check the gas pressure, no gas or gas pressure lower;
Press the ON/OFF to Reset;
Contact a qualied service technician
E3
Dry burning(over temperature)
protecon
Temperature higher than 85℃has been detected.
Check the water pressure, water pressure too low.
Contact Marey technical support.
E4
Inlet water temperature sensor
failure
Contact Marey technical support.
E5
Fan failure
Contact Marey technical support.
E6
Water sensor overheat protecon
Inlet temperature75℃, check the temperature
sensor;
Outlet temperature85℃,check the temperature
sensor.
E7
Proporonal valve or Solenoid
valve failure
Contact Marey technical support.
E8
Flue pipe outlet blockage
Check the air intake/exhaust ue duct;
Press the ON/OFF to Reset.
E9
False Flame
Press the ON/OFF to Reset;
Contact Marey technical support.

19
3.1 INSTALLATION GUIDELINES
Only properly qualied personnel should install this equipment. Improper installation or
installation by a non-qualied installer may void warranty. Failure to comply with state and
local codes pertaining to water heater installations may void also warranty.
Water heaters are suitable for installation as a single stand unit. These guidelines are for the
installation of a single unit.
This appliance shall NOT be installed outdoors.
The appliance and its gas connection must be leak tested before placing the appliance in
operation. A qualied installer or service technician should inspect and leak test system
before use.
The installation must comply with local codes. In the absence of local codes the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA
B149.1 shall prevail. If installed in a manufactured home, the installation must conrm with
the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280 or the
Canadian standard CSA Z240 MH Series, Manufactured Homes.
The appliance must be electrically grounded in accordance with local codes. In the event
there are no local codes, the National Electrical Code, ANSI/NFPA 70, or the Canadian
Electrical Code, CSA C22.1 shall prevail.
Maximum and minimum inlet gas pressure:
3. INSTALLATION
MODELS
INLET GAS PRESSURE
MAX. MIN.
GA30NG
10.5’’wc (2.5kPa) 3.5’’wc (870Pa)
GA30LP
13.0’’wc (3.23kPa)
8.0’’wc (1.99kPa)

20
The appliance and its individual shut off valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of ½ psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual
manual shut off valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than ½ psi (3.5 kPa).
The gas pressure will be between these values 3.5 in W.C. (870 Pa) 10.5 in W.C.
(2610 Pa) for natural gas and 8.0 in W.C. (1990 Pa) 13.0 in W.C. (3230 Pa) for liquid propane.
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 oors of the structure. When
such locations cannot be avoided, it is recommended that a suitable drain pan, adequately
drained, be installed under the appliance. The pan must not restrict combustion air ow.
Do not obstruct the combustion air intake or heater exhaust and ensure air intake is not near
an area that will allow chemical fumes to enter the combustion air system.
Do not use to heat pools or spas (hot tubs) that use chemically treated water.
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, means shall be provided to control thermal expansion.
Contact the water supplier or local plumbing inspector on how to control this situation.
3.2 PACKING LIST
The following contents are included. If any items are missing contact Marey toll free support
line: 1-855-627-3955.
Item
Item#
Quanty
Water heater
A
1
Installaon and user guide
B
1
Expansion screw
C
3
Seal ring
D
2
Tapping screw
E
2
Expansion dowel
F
2
Pressure relief valve
G
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