Marey 26HW70 A Operating and maintenance manual

Keep this manual with you after your unit has been installed, you
may need it for further technical information.
GAS TANKLESS WATER HEATER
INSTRUCTIONAL
MANUAL
USA [phone] PR [phone]
www.marey.com
GAS 26L
OUTDOOR
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 meet-
ing 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.

INDEX
IMPORTANT NOTES
PERFORMANCE FEATURES
INTRODUCTION
INSTALLATION
REMOTE CONTROLLER
INITIAL OPERATION
NORMAL OPERATION
MAINTENANCE AND SERVICE
PACKING LIST
04
06
08
11
21
23
24
25
30

- This manual has been prepared for the installation and use of the equipment.
- Please keep it in a safe place for future reference.
The installation must be done in accordance with the information supplied in this manual.
All other relevant national, state and local regulations must also be adhered to including (but
are not limited to):
- National Fuel Gas Code:
American Standard ANSI Z223.1/NFPA 54.
Canadian Standard CSA B149.
- The Manufactured Home Construction and Safety Standard:
American Standard, Title 24 CFR,Part 3280.
Canadian Standard CSA 2240 MH.
- National Electrical Code:
American Standard ANSI/NFPA 70.
Canadian Standard CSA C22.
- American National Standard / Canadian Standards Association Standard for Gas Water Heaters:
ANSI Z21.10.3·CSA.
- Local, Water, Gas, Electrical and Plumbing Authority Regulations.
- Municipal Building Codes including local OH&S requirements.
1.1 INSTALLATION NOTES
Maintenance and trouble-shooting must be done in accordance with these instructions and
the applicable regulations listed above.
1.2 SERVICE NOTES
It is recommended to ush and maintain the gas water heater for ≥1 times a year. Please contact
your local dealer for maintenance. Do not disassemble the gas water heater without permission.
SERVICE SHALL BE CARRIED OUT ONLY BY AUTHORIZED PERSONNEL
AND THE APPLIANCE SHALL NOT BE MODIFIED
(for example, a licensed plumber or gas technician).
1.3 GAS WATER HEATER MAINTENANCE
1. IMPORTANT NOTES
WARNING
04

1.4 PLUMBING NOTES
- PLEASE NOTE GA26O model is supplied factory pre-set at Nominal 70°C maximum outlet
watertemperature to comply.
- The GA26O unit REQUIRES a temperature control device to be installed.
- Please follow all the instructions in the Installation Guide and the following additional
instructions for the water heater outlet connection:
1. When connecting the hot water supply to the xtures of the property a minimum
of two (2) metres of pipework must be used between the outlet of the water heater
and the rst tap / outlet. (As shown in the picture below).
2. The hot water line should be insulated with Armaex or similar pipe insulation.
3. When the installation is completed the temperature is to be tested at the taps to
conrm the water temperature does not exceed the required 50ºC setting.
4. Water pipe size is nominal 15mm from hot water outlet to the rst tap / outlet.
5. Gas pipe size is nominal 20mm.
05
ENSUITE
LAUNDRY
BATHROOM
KITCHEN
HOT
WATER
OUTLET COLD
WATER
INLET
GAS
INLET
CONTROLLER 3
(OPTIONAL)
CONTROLLER 2
(OPTIONAL)
CONTROLLER 1
(OPTIONAL)
MIN. 2 METRES
(FROM HOT OUTLET TO NEAREST HOT WATER TAP/OUTLET)

2. PERFORMANCE FEATURES
06
IMPORTANT WARNINGS ABOUT HOT WATER
- Heated water can be dangerous, especially
for young children and the vulnerable.
- Water temperatures above 50°C can cause
severe burns instantly and may even result in death.
- Those most at risk are children, disabled and
elderly.
- Hot water at 65°C can severely burn a child in less
than half a second.At 50°C it takes ve minutes.
ALWAYS...
- Test the temperature of the water with your elbow before placing your child in the bath, also
carefully feel water before bathing or showering yourself.
- Supervise children whenever they are in the bathroom.
Make sure that the hot water tap is turned off tightly.
CONSIDER...
- Installing child proof tap covers or child resistant taps (both approaches will prevent a small
hand from being able to turn on the tap).
- Setting your appliance at a maximum temperature of 50°C.
NEVER…
- Leave a toddler in the care of another child. They may not understand the need to have the
water temperature set at a safe level.
- This product is a forced type gas water heater. When the gas water heater is powered on,
the expended gas will be forced to exhaust out with the help of an internal draught fan.
- Rain-proof outdoor gas water heater: when the gas water heater is installed outside, its
rain-proof design helps to stop the rain dropping into the gas water heater.
- The gas water heater inhales air from outside to burn and exhaust the gas waste to outside.
- User can operate the gas water heater through a remote control device, it is safe and
reliable.
- Digital constant temperature system: microcomputer control system is a “computer” of the
gas water heater to control and coordinate the water, electricity, and gas of the gas water heater
to make sure that the outlet water temperature is stable and meets shower requirements.
- Low start up water pressure: low water pressure to start up and suitable to use widely.
- Flame-out protection: when working, if the gas water heater ames out suddenly, it will cut
off the gas automatically to make sure no gas leakage occurs.
WARNING ABOUT HOT WATER

- Continuously variable wind resistance feature: when the chimney or the gas exhaustion is
blocked, the built-in microcomputer system will detect and enhance the revolving speed of
the fan to eliminate the noxious gas. When the revolving speed is up to the limited speed,
the microcomputer system will send out an order to cut off gas and ame so as to protect
the gas water heater.
- Water-gas valve control: when the city water supply is cut off or the water outlet valve is
shut down, the gas water heater will stop working and power off.
- Over-pressure protection: when the water pressure supply is too high, the safety valve in
the gas water heater will release water pressure automatically to protect the gas water
heater from damage.
The water heater has an automatic drainage function. When the water inlet pressure of the
water heater exceeds 1.0MPa~1.2MPa, the water heater will automatically drain. Please do
not place objects around the water heater to avoid damage caused by water immersion of
the water heater. When the water heater automatically drains the water, it indicates that the
water system pressure is too high. After the pressure is reduced or the water valve is
closed, conrm that the pressure meets the requirements for using the water heater.
WARNING
- The appliance will operate at reduced performance below 340 kPa water pressure.
- For information relating to burner test point pressures and injector sizes refer to the name
plate located on the right hand side of the case for each model. (Please refer to p.11)
- For information relating to overall dimensions and connection points refer to diagrams.
(Please refer to p.9,16)
- Installing in areas over 1500 m above sea level will reduce performance.
NOTES
07

08
- This manual provides information necessary for the installation, operation, and mainte-
nance of the water heater.
- The model description is listed on the name plate which is attached to the right side of the
case of the water heater. (Please refer to p.12)
- Please read all installation instructions completely before installing this product.
- The Water Heater is an instantaneous water heater designed to efciently supply endless
hot water on demand.
THE PRINCIPLE OF THE WATER HEATER IS SHOWN BELOW:
OPERATION PROCESS OF GAS WATER HEATER:
①. A hot water tap is turned on.
②. Water enters the water heater via the cold water inlet.
③. The water ow sensor detects the water ow.
④. The computer automatically ignites the burner.
⑤. Water circulates through the heat exchanger and is heated
⑥. The computer will modulate the gas supply valve and water ow to
produce the right amount of hot water at the correct temperature.
⑦. When the tap is turned off, the unit shuts down.
3. INTRODUCTION
Cold
Water Inlet
Gas Inlet
A.C. 110V
Hot Water
Outlet
Gas proportion valve
Water temperature probe
Computer board
Heat Exchanger
Exhaust
Burner
Fan
Water Flow Sensor
Water temperature probe

09
3.1 DIMENSIONS AND CONNECTION POINTS
Cold water inlet
Cold water inlet
Drain screw
Water inlet filter
Controller interface
Hot water outlet
Gas inlet

10
3.2 SAFETY GUIDELINES
Ensure the following warnings and instructions are read and understood before commencing
installation.
3.3 GENERAL GUIDELINES
- Carefully plan where you intend to install the water heater.
- Please ensure:
· The water heater has adequate space for natural ventilation;
· Is located where water leakage will not damage surrounding areas;
· Has all transit protection/packaging removed;
- Check the name plate and gas type label for the correct gas type, gas pressure, water
pressure and electric rating; If this unit does not match operating condition, do not install and
consult with your supplier.
- If any problem should occur, turn off the gas, all hot water taps and call a licensed profes-
sional.
- Installation and service must be performed by a licensed professional (for example, a
licensed plumber).
- The licensed professional is responsible for the correct installation of the water heater and
for compliance with all relevant national, state and local regulations.
- The water heater must be installed outdoors only. Do not install water heater indoors.
- Not to be used as a pool heater.
WARNING
- Water temperatures above 50ºC can cause severe burns or death from scalding.
- Children, the disabled and the elderly are at a high risk of being injured. Feel the water
temperature before bathing or showering. Do not leave children, disabled persons, or the
elderly unsupervised.
- This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge, unless they
have been given supervision or instruction concerning use of the appliance by a person
responsible for their safety.
- Children should be supervised to ensure that they do not play with the appliance.
- If the supply cord is damaged, it must be replaced by the manufacturer, its service agent
or similarly qualied persons in order to avoid a hazard.
WARNING

11
4.1 SPECIFICATIONS
TECHNICAL DATA AND DIMENSIONS
- Do not store or use gasoline or other ammables, vapors, or liquids in the vicinity of this
appliance. Vapors from ammable liquids will explode and catch re causing death or
severe burns.
- Do not reverse the water and/or gas connections as this will damage the gas valves and
can cause severe injury or death. Follow the diagram when installing your water heater
(Please refer to p.8).
- Do not use this appliance if any part has been in contact with or been immersed in water.
- Immediately call a licensed professional to inspect and/or service the unit if necessary.
- Do not disconnect the electrical supply if the ambient temperature will drop below
freezing.
- The Freeze Prevention System only works if the unit has electrical power. The warranty will
not be covered if the heat exchanger is damaged due to freezing. Refer to the section on the
Freeze Prevention System for more information (Please refer to p.25).
PROHIBITED
4. INSTALLATION
Model name
26HW70 A
Gas category
NG
ULPG
Nominal Gas Consumption
BTU/HR
180000
180000
Nominal minimum gas
consumption
BTU/HR
40000
40000
Test Point Pressure
kPa
1.74
2.7 4
Nominal burner pressure
kPa
1.13
1.38
Water Pressure Maximum
kPa
750
Water Pressure Minimum
kPa
10
Number of burners
Pcs
1
1
Number Of Injectors
Pcs
18
18
Injector Diameter
mm
1.45
1.1
Burner Control Segment
Pcs
6, 12, 18
Electrical rating
W
44
44
Heat output
kW
52.8 52.8
Water heating capacity
L/min at
25ºC Rise
26
26
Height
mm
635
Width
mm
415
Depth
mm
157
Net Weight
Kg
18.9
Overheating Cut -off
C
80
Electricity supply
11 0Va.c, 60Hz
Ignition
Direct without
pilot
Gas inlet connection
G3/4
Water connection
G3/4

12
The water heater requires careful and correct installation to ensure safe and efcient operation.
This manual must be followed. Please read the “SAFETY GUIDELINES” and the “IMPORTANT-
NOTES” sections at the beginning of this manual.
4.2 CONFIRM THE APPLIANCE SUITABILITY
Check the gas type label and the name plate for the correct gas type, gas pressure, water pressure
and electrical rating for your application. Do not install the unit if these requirements are not met.
- This equipment is not suitable for pool or spa heating.
- Water hardness may affect the water heater performance. It is important that the water
heater is installed in water conditions that are suitable for long term operation.
- This is a water heating apparatus only and the delivered water quality is dependent upon
the quality of water supplied to this system.
- The connection, attachment, integration or general association of other equipment or parts
not specied by the water heater which either directly or indirectly affect the operation or
performance of this equipment could void the warranty.
- The manifold pressure is preset at the factory. It is computer controlled and should not
need adjustment.
- It should be as close as practical to the hot water outlets to minimise heat loss and cost.
- The water heater does not require a reproof back plate if installed on a timber wall.
- Special conditions which should be avoid, e.g. marine environment, high humidity condi-
tions (more than 95%RH), to ensure optimum performance.
WARNING
Gas Type Label
Position on Unit
Rating Label
Position on Unit

4.3 SELECTING SUITABLE LOCATION FOR INSTALLATION
Carefully read this section before installation and selecting the location for installing the water
heater. The following precautions should be considered.
13
- This is a water heating apparatus only and the delivered water quality is dependent upon
the quality of water supplied to this system.
- Although the water heater is designed to operate with minimal noise level, you should not
install the unit on a wall adjacent to a bedroom, or a room that is intended for quiet study or
meditation, etc.
- Locate your heater close to a drain where leakage will not do damage to surrounding areas.
- As with any water heating appliance, the potential for leakage at some time in the life of
the product does exist.
WARNING
- Take proper care to warn occupants of the building and the public of any injury that may
occur from falling tools, open trenches, water connections or any other general hazard.
- Make sure the water heater will have sufcient room to expel combustion air and operate
with natural ventilation.
- Keep the area around the water heater clean. Particles may clog the air vent, reduce fan
function, or cause improper combustion.
- Locate the unit for easy access and maintain clearance for service and maintenance. Install
the unit so that it can be connected or removed easily.
- The water heater must be installed outdoors only. Do not install the water heater indoors.
- Not to be used as a swimming pool heater.
- Do not locate your water heater in a pit or any location where gas and water can accumulate.
- Please check the proximity of gas & electrical connections so as not to create a hazard and
avoid access problems for other services.
- It must be located in accordance with the requirements clearances from eaves, windows,
vents etc. –And see the diagram on the p.12~13. for more surrounding construction material
requirement.
- Do not place ammable or explosive materials within one meter of the water heater to avoid res;
- This relates to the physical separation distance specication where multiple appliances are
employed. That equates to a minimum 150mm horizontal ue separation distance allowing
appliances to be placed side by side in the same vertical plane
- Most load bearing walls such as brick, brick/veneer, weatherboard and stud-frames are
suitable locations.
- Securely fasten the unit to the wall with screws or bolts in the top and bottom brackets.
- And see the diagram on the p.12~13. for more surrounding construction material requirement.
WARNING

14
- The distance between the water heater and the surrounding wall, unit: mm.
4.4 CLEARANCES FOR OUTDOOR HEATER LOCATIONS
- Clearance in accordance with local installation codes and the requirements of the gas supplier.
- A vent shall not terminate directly above a sidewalk or paved driveway that is located
between two single family dwellings and serves both dwellings.
- Permitted only if veranda,porch,deck,or balcony is fully open on a minimum of two sides
beneath the oor.
- This water heater is strictly forbidden
to be installed indoors and in the bathroom.
- The water heater shall not be installed under the
exhaust fan of the exhaust fan or therange hood.
- There shall be no other gas appliances near the
installation of the water heater, and there shall
be no ammable gases, liquids, etc. around it.
- Installation of outdoor water heaters should avoid
the impact of other people's lives dueto exhaust
and noise.
- The water heater must be installed in a well
ventilated area (eg. open balcony, patio).
Exhaust Equipment

15
- The distance between the water heater and the surrounding wall, unit: mm.

16
4.5 WATER HEATER INSTALLATION
①. According to the requirements of the gure and
the size of the water heater, mark the wall with a
dash mark, then drill three holes with a diameter of
¢8mm and a depth of 60mm, respectively insert
three M6×50mm expansion screws into the hole
and tight the expansion screws with a wrench.
②. Hang up the water heater, screw on the M6nut,
and x the water heater to the wall;
③. The installation of the water heater must be
correct, otherwise it will affect the normal use of
the water heater;
4.6 GAS CONNECTION
POWER CORD
GAS VALVE
GAS INLET

17
4.7 SIZING AND CONNECTION SUITABILITY
- Check the gas type label to make sure that the unit was built for the type of gas you will be
using, and that the gas inlet pressure is within the appropriate range.(Please refer to p.8.)
- Gas pressure below this specied range for the water heater and/or insufcient gas volume will
adversely affect performance.
- Inlet gas pressure must not exceed the maximum values; gas pressure above the specied
range will cause dangerous operating conditions and damage to the unit.
- Until testing of the main gas line supply pressure is completed, ensure the gas line to the water
heater is disconnected to avoid any damage to the water heater.
- Always use approved connectors to connect the unit to the gas line. Always purge the gas line
of any debris before connecting to the water heater.
- Install a manual gas shut-off valve between the water heater and the gas supply line.
- The regulator is preset at the factory. It is computer controlled and is not to be adjusted by any
person other than a licensed professional.
- When the gas connections are completed, perform a gas leak test either by applying soapy
water to all gas ttings and observing for bubbles or by using a gas leak detection device.
4.8 MEASURING INLET GAS PRESSURE AND TESTING GAS LEAKAGE
①.Shut off the manual gas valve on the supply gas line.
②.Open a tap/outlet. The unit should turn on and the gas in the gas pipe line should be purged.
③.Leave the tap/outlet running until the unit shuts down due to lack of gas supply. Then turn off the tap/outlet.
④.Remove the screw on the pressure port located on the gas inlet of the water heater shown in
the diagram to the above.
⑤.Connect the manometer to the pressure port.
⑥.Re-open the manual gas valve. Check to see that there are no gas leaks.
⑦.Open some of the xtures that use a high ow rate to turn on the water heater.
⑧.Check the inlet gas pressurein the position showed in the red circle above When the water heater
is at a maximum operation capacity, the inlet gas pressure point must be within the appropriate
range.
(Please refer to p.11)
Conversion of this unit from natural gas to propane (LPG) or propane (LPG) to natural gas can
not be done in the eld. Contact your supplier to get the correct unit for your gas type.
WARNING

18
4.9 WATER CONNECTIONS
- All pipes, pipe ttings, valves and other components, including soldering materials, must be
suitable for potable water systems.
- A manual shut off valve must be installed on the cold water inlet to the water heater between
the main water supply line and the water heater.
- Only a gate valve or a ball valve is to be used on the cold water supply.
- Check the cold water pressure. If above 1000 kPa an approved limiting valve must be tted.
- Before installing the water heater, ush the water line to remove all debris, and after installation
is complete, purge the air from the line. Failure to do so may cause damage to the heater.
- To prevent water heater water system damage caused by excessive pressure. At the water
outlet of the water heater, it is necessary to install an appropriate pressure relief valve to protect
the water system and user safety. The pressure relief valve complies with ANSIZ21.22/CSA 4.4
- In the hot water system, the temperature rises continuously, and the volume of water expands.
- If the system is equipped with an expansion tank or a exible connection bellows can absorb a
part of the expansion amount, the expansion tank or the soft connection bellows cannot absorb
the pressure relief valve needed to protect the pressure relief valve to protect The entire system
prevents breakage of pipes and other components, so the relief valve pressure setting is
generally selected to be slightly less than the maximum pressure (Pmax) that the entire system
can withstand.
- In addition, the pressure can not be the same as the normal operating pressure.
- In order to prevent the damage of the temperature probe or control system and cause the
continuous heating of hot water to reach 100ºC (212°F) vaporization, it is necessary to install a
temperature and pressure safety valve, and the temperature and pressure valve temperature
reaches 99ºC (210°F) to relieve the pressure, thereby protecting the entire system. So the safety
valve temperature is generally set to 99ºC (210°F).
- There is a wire mesh lter to discourage debris from entering your heater. Clean lter after
initial installation to ensure no debris from the pipe work has clogged it.
HOT WATER OUTLET
FILTER AND DRAIN PLUG
GATE OR BALL VALVE ON INLET
COLD WATER INLET
WATER OUTLET
TEE VALVE
PRESSURE RELIEF VALVE
DRAIN PIPE

19
4.10 PRESSURE RELIEF VALVE INSTALLATION AND ATTENTIONS
- Please use Teon tape or sealant to seal the thread of pressure relief valve, then install it into
Tee valve G3/4 outlet (As shown above).
- Please use Teon tape or sealant to seal the thread of water outlet, then install pressure relief
valve, tee valve and water outlet together. Please select a suitable position to install (As shown
above).
- Please note that the outlet of pressure relief valve can not face upward, otherwise it will always
leave some water inside.
- Anti-fouling and anti-scaling, dirt will directly affect the normal function of the safety valve function.
- The drain pipe must match the drain port to ensure that the valve does not interfere with the
normal operation of the valve.
- The pressure relief valve outlet can be installed horizontally or vertically, but it cannot make
pressue outlet facing upwards, otherwise it can not work normally. It is forbidden to block its outlet
- The dirt will directly affect the normal function of the safety valve function. It requires hot water
system maintenance of anti-fouling and anti-scaling cleaning.
- The user must check the relief valve at least once a year. When checking, turn off the water
heater's power supply and gas. Turn on the water inlet switch to create pressure in the water
system. Then gently open relief valve handle until there is water out and then gently close, if
there is no water out, indicating that the valve is invalid, this time should immediately turn off the
water heater water switch and ask the service personnel to deal with.
- Before operating the handle, check the discharge line connecting the valve to ensure that the
water drained from the valve can be drained to a suitable place.
- Do not check the safety valve when the water heater is in normal operation to avoid hot water burns.
- When the set temperature exceeds 50 °C, the ick mixer must be installed to mix the cold
water and hot water before the temperature does not exceed 50 °C, otherwise it will burn
the skin. Please refer to the method of using the ick mixer. (Please refer to p.23~24)
WARNING
Model Recommended pressure relief
value / temperature
800kPa/99ºC (201ºF)
PRESSURE RELIEF VALVE
DRAIN PIPE
TEE VALVE
WATER OUTLET
HOT WATER OUTLET
GA26O

20
4.11 WIRING DIAGRAM
4.12 ELECTRICAL CONNECTION
- The water heater must be electrically grounded. Do not attach the ground wire to either the gas or
water piping.
- The water heater requires an AC 110V 60Hz.
- The weather-proof power point should be no more than 1 meter from the base of the water heater for
easy access.
- Install a power switch so that the electrical power can be switched off if necessary.
- If the cord supplied with this appliance must be replaced, it must be replaced with the correct
appliance wiring material supplied by the Manufacturer.
- When servicing or replacing parts within the water heater, label all wires prior to disconnection to
facilitate an easy and error free reconnection. Verify proper operation after servicing.
Do not reverse the hot outlet and cold supply line connections to the water heater as this will cause
your heater to operate improperly.
WARNING