Gorenje GWHNNBW G20 User manual

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GAS WATER HEATER
–
USER MANUAL AND INSTALLATION INSTRUCTIONS
ГАЗОВИЙ ВОДОНАГРІВАЧ
–
ІНСТРУКЦІЯ ЗМОНТАЖУ
ТА ЕКСПЛУАТАЦІЇ
ГАЗОВЫЙ ВОДОНАГРЕВАТЕЛЬ
–
РУКОВОДСТВО ПО УСТАНОВКЕ
ИЭКСПЛУАТАЦИИ
RUS
UA
GB

1
English
GWH --NNBW G20 2013
Before using your gas water heater, please read
this manual carefully and keep it for future reference.
FLUE-TYPE
GAS WATER HEATER
USER MANUAL
INSTALLATION INSTRUCTIONS
Read This Manual
Inside you will find many helpful hints on how to use and maintain your gas water
heater properly. Just a little preventative care on your part can save you a great deal
of time and money over the life of your gas water heater. You'll find many answers to
common problems in the chart of troubleshooting tips. If you review the chart of
Troubleshooting Tips first, you may not need to call for service.

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CONTENTS
USER MANUAL
Sociable remark .......................................................................................................3
Safety precautions....................................................................................................4
Features ..................................................................................................................6
Temperature / power adjustment .............................................................................7
INSTALLATION INSTRUCTIONS
Safety precautions....................................................................................................8
Description of the appliance...................................................................................11
Installation requirements ........................................................................................12
Installation method ................................................................................................13
Commissioning ......................................................................................................15
Repair and maintenance .......................................................................................16
TROBLESHOOTING
Troubleshooting .....................................................................................................18
SPECIFICATION
Specification...........................................................................................................19
CAUTION
•Contact an authorized service technician for repair or maintenance of this unit.
•Contact the authorized installer for installation of this unit.
•The gas water heater is not intended for use by young children or invalids
without supervision.
•Installation work must be performed in accordance with the national gas and
wiring standards by authorized personnel only.

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USER MANUAL
Sociable remark
When using this gas water heater, the following information’s must be
followed:
DISPOSAL:
Do not dispose this product as unsorted municipal waste. Collection of such waste
separately for special treatment is necessary.
It is prohibited to dispose of this appliance in domestic household waste.
For disposal, there are several possibilities:
•The municipality has established collection systems, where electronic waste
can be disposed of at least free of charge to the user.
•As old products contain valuable resources, they can be sold to scrap metal
dealers.
Wild disposal of waste in forests and landscapes endangers your health when
hazardous substances leak into the ground-water and find their way into the food
chain.

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USER MANUAL
Safety precautions
Please contact local gas company, gas management department or an
authorized installer for installing gas water heater.
Failure to install the appliance in accordance with all current regulations can
result in fierce hazard on user’s life.
Failure to install the appliance in accordance with all current regulations can
result in the guarantee becoming void.
Failure to comply with this warning implies the risk of personal injury, in some
circumstances even fatal.
Failure to comply with this warning implies the risk of damage, in some
circumstances even serious, to property, plants or animals.
Do not perform operations which involve opening the appliance.
Personal injury caused by burns due to overheated components, or wound
caused by sharp edges.
Do not perform operations which involve removing the appliance from its
installation space.
Flooding caused by water leaking from disconnected piping.
Explosions, fires or intoxication caused by gas leaking from disconnected piping.
Do not leave anything on top of the appliance.
Personal injury caused by an object falling off the appliance as a result of
vibrations. Damage to the appliance or items underneath it caused by the object
falling off as a result of vibrations.
Do not climb onto the appliance.
Personal injury caused by the appliance falling.
Damage to the appliance or any objects underneath it caused by the appliance
falling away from its installation space.
Do not climb onto chairs, stools, ladders or unstable supports to clean the
appliance.
Personal injury caused by falling from a height or cuts (stepladders shutting
accidentally).
Do not attempt to clean the appliance without first closing gas valve and
turning the switch to the OFF position.
Electrocution from live components. Explosions, fires or intoxication caused by
gas leaking from disconnected piping.

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USER MANUAL
Do not use insecticides, solvents or aggressive detergents to clean the
appliance.
Damage to plastic and painted parts.
Do not allow children or inexperienced individuals to operate the appliance.
Damage to the appliance caused by improper use.
If you detect a smell of burning or smoke coming from the appliance,
disconnect it from the electricity supply, turn off the main gas valve, open all
windows and call for assistance.
Personal injury caused by burns, smoke inhalation, intoxication.
If there is a strong smell of gas, turn off the main gas valve, open all windows
and call for assistance.
Explosions, fires or intoxication.
Do not touch the housing of the gas water heater during operation. During
operation only setting knobs can be touched.
Risk of scalding.
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.
Warning!!
Turn off the power, gas valve and water valve after use.
Warning!!
Water with a temperature higher than 50°C can cause serious burns.
Always verify water temperature before use.
Warning!!
The device must be activated only in presence of water in the exchanger.
Warning!!
In case of contaminated water on the inlet of the device, the water on the outlet
is not suitable for drinking.

6
USER MANUAL
Features
1. AUTOMATIC OPERATION
•When you turn on the hot water tap or a shower, hot water will be produced
instantly.
•Independent control of water flow and gas flow makes it easy to regulate
water temperature.
2. INNOVATIVE DESIGN
•Ultra-thin design, beautiful shape and convenient to install.
•Advanced energy saving combustion technology for high burning
efficiency.
•Low water pressure ignition, appropriate for users living in areas with low
water pressure.
•Flame stage control for more precise temperature regulating.
3. COMPLETE SAFETY
•Sensitive IC flame sensor will cut gas supply if flame goes out
unexpectedly.
•Low water pressure protection.
•In case of no-water burning, gas valve will automatically turn off.

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USER MANUAL
Temperature / power adjustment
1. Adjustment of water temperature (flow)
The temperature regulation knob can be used to adjust the volume of water
circulation. This operation can change temperature of hot water. If you want to
increase the temperature of hot water, please turn the regulator of water temperature
clockwise. If you want to reduce temperature of hot water, please turn the regulator of
water temperature counterclockwise.
Warning!!
Water with a temperature higher than 50°C can cause serious burns.
Always verify water temperature before use.
Please keep the valve at the cold water inlet completely open. Don't
reduce the water circulation by means of closing the valve.
2. Power (flame) adjustment
Gas regulation knob can be used to adjust the volume of gas circulation. This
operation can adjust volume of gas circulation and the temperature of hot water.

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INSTALLATION INSTRUCTIONS
Safety precautions
Please contact local gas company, gas management department or an
authorized installer for installing gas water heater.
Failure to install the appliance in accordance with all current regulations can
result in fierce hazard on user’s life.
Carbon monoxide detector must be installed in the same room as gas water
heater.
Use appliance only with type of gas, stated on the marking plate!
Install the appliance on a solid wall which is not subject to vibration.
Noisiness during operation.
When drilling holes in the wall for installation purposes, take care not to
damage any electrical wiring or existing piping.
Electrocution caused by contact with live wires. Explosions, fires or asphyxiation
caused by gas leaking from damaged piping. Damage to existing installations.
Flooding caused by water leaking from damaged piping.
Protect all connection pipes and wires in order to prevent them from being
damaged.
Electrocution caused by contact with live wires. Explosions, fires or asphyxiation
caused by gas leaking from damaged piping. Flooding caused by water leaking
from damaged piping.
Make sure the installation site and any systems to which the appliance must be
connected comply with the applicable norms in force.
Electrocution caused by contact with live wires which have been installed
incorrectly. Damage to the appliance caused by improper operating conditions.
Use suitable manual tools and equipment (make sure in particular that the tool
is not worn out and that its handle is fixed properly); use them correctly and
make sure they do not fall from a height. Replace them once you have finished
using them.
Personal injury from the falling splinters or fragments, inhalation of dust, shocks,
cuts, pricks and abrasions. Damage to the appliance or surrounding objects
caused by falling splinters, knocks and incisions.

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INSTALLATION INSTRUCTIONS
Make sure any portable ladders are positioned securely, that they are suitably
strong and that the steps are intact and not slippery and do not wobble when
someone climbs them. Ensure someone provides supervision at all times.
Personal injury caused by falling from a height or cuts (stepladders shutting
accidentally).
Make sure any rolling ladders are positioned securely, that they are suitably
strong, that the steps are intact and not slippery and that the ladders are fitted
with handrails on either side of the ladder and parapets on the landing.
Personal injury caused by falling from a height.
During all work carried out at a certain height (generally with a difference in
height of more than two meters), make sure that parapets are used to surround
the work area or that individual harnesses are used to prevent falls. The space
where any accidental fall may occur should be free from dangerous obstacles,
and any impact upon falling should be cushioned by semi rigid or deformable
surfaces.
Personal injury caused by falling from a height.
Make sure the workplace has suitable hygiene and sanitary conditions in terms
of lighting, ventilation and solidity of the structures.
Personal injury caused by knocks, stumbling etc.
Protect the appliance and all areas in the vicinity of the work place using
suitable material.
Damage to the appliance or surrounding objects caused by falling splinters,
knocks and incisions.
Handle the appliance with suitable protection and with care.
Damage to the appliance or surrounding objects from shocks, knocks, incisions
and squashing.
During all work procedures, wear individual protective clothing and equipment.
Personal injury caused by electrocution, falling splinters or fragments, inhalation
of dust, shocks, cuts, puncture wounds, abrasions, noise and vibration.
Place all debris and equipment in such a way as to make movement easy and
safe, avoiding the formation of any piles which could yield or collapse.
Damage to the appliance or surrounding objects from shocks, knocks, incisions
and squashing.
All operations inside the appliance must be performed with the necessary
caution in order to avoid abrupt contact with sharp parts.
Personal injury caused by cuts, puncture wounds and abrasions.

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INSTALLATION INSTRUCTIONS
Reset all the safety and control functions affected by any work performed on
the appliance and make sure they operate correctly before restarting the
appliance.
Explosions, fires or asphyxiation caused by gas leaks or an incorrect flue gas
exhaust. Damage or shutdown of the appliance caused by out-of-control
operation.
Before handling, empty all components that may contain hot water, carrying
out any bleeding if necessary.
Personal injury caused by burns.
Descale the components, in accordance with the instructions provided on the
safety data sheet of the product used, airing the room, wearing protective
clothing, avoid mixing different products, and protect the appliance and
surrounding objects.
Personal injury caused by acidic substances coming into contact with skin or
eyes; inhaling or swallowing harmful chemical agents. Damage to the appliance
or surrounding objects due to corrosion caused by acidic substances.
If you detect a smell of burning or smoke, keep clear of the appliance,
disconnect it from the electricity supply, open all windows and contact the
technician.
Personal injury caused by burns, smoke inhalation, asphyxiation.
If there is a strong smell of gas, turn off the main gas valve, open all windows
and call for assistance.
Explosions, fires or intoxication.
Do not touch the housing of the gas water heater during operation. During
operation only setting knobs can be touched.
Risk of scalding.
No other oxygen consumer devices (burners, heaters, clothes dryers) should
be installed in the same room as gas water heater.
Risk of asphyxiation.

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INSTALLATION INSTRUCTIONS
Description of the appliance
1. Drought diverter
2. Thermostat hot gas
3. Water pipe
4. Screw
5. Back cover
6. Front cover
7. Heat exchanger assembly
8. Burner assembly
10.Knob assembly
11.Seal ring for water pipe
12.Screw
13.Spring ring 5
14.Battery box
15.Water and gas linkage valve
16.Screw
17.Dust proof shutter
18.Seal ring
19.Screw
20.Spring ring 4
21.Water outlet holder
22.On / off switch
23.Ignition system
24.Igniter baffle
25.Screw
26.Front cover holder
27.Heat shield for burner
28.Heat transferring sheet
29.Igniter holder
30.Screw
31.Pilot holder
32.Thermostat hot water
33.
Screw

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INSTALLATION INSTRUCTIONS
Installation requirements
•The gas water heater cannot be installed in bedroom, basement, bathroom or
any other place with poor ventilation. To assure enough fresh air, an air inlet
with an area of at least 300 cm
2
should be installed in the room in which gas
water heater is installed.
•The installation height of gas water heater is around 1,6m from the floor.
•Electric equipment or lines are not allowed to be placed on top of the gas
water heater. The horizontal distance between the gas water heater and
electric equipment should be more than 400 mm.
•Distance between the gas water heater and any flammable materials should
be 150 mm at least.
•In order to allow easy access to the appliance for maintenance operations
please leave a space of at least 600 mm in front of the gas water heater.
•The gas water heater should not be installed outdoor or in any places with
strong wind.
•In case that the appliance is to be installed on wall or holder made from a
flammable materials, metal heat-preventing plate in 100 mm more in size than
gas water heater must be used. Distance between metal plate and wall
(holder) must be at least 10 mm.
•Install gas water heater in vertical position.
•Do not install gas water heater in room, where appliance is subjected to
freezing.
Min 10 mm
Metal plateWall (holder)
Gas water heater

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INSTALLATION INSTRUCTIONS
Installation method
1. Installation of main body
Drill holes in the wall according to the dimensions of the gas water heater and fix
the M6 expansion bolts. Hang up the hanging bracket slot of the gas water heater
on the expansion bolt. Fix the gas water heater by screwing the nuts. Fix the
lower hanging brackets with two plastic expansion bolts.
2. Installation of water pipes
•The size of cold and hot water connector is G1/2.
•Before connecting up the appliance it is necessary to thoroughly flush and
purge the water and gas pipes in order to remove filings or other waste from
them.
•For the convenience of maintenance please install the water inlet valve near
the appliance.
•Connect the cold water and hot water pipes in correct order. Markings are
located on the bottom of the gas water heater near the connectors.
•Purge air from water pipes by opening all the taps, hot and cold. Then turn off
the taps and check for water tightness.
Important!!
The maximum inlet water pressure must be limited to 10 bar. If the water
supply is more than 10 bar or subject to pressure fluctuations above 10
bar, a pressure limiting valve must be installed to limit the pressure to 10
bar maximum.
Minimum water pressure is 0,2 bar.
Warning!!
Water with a temperature higher than 50°C can cause serious burns.
Always verify water temperature before use.
Connector Connector
Water inlet valve
Cold water inlet
Hot water outlet
Gas inlet
Water pipe Gas
valve

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INSTALLATION INSTRUCTIONS
3. Installation of gas pipe
•The size gas connector is G1/2 or G3/4, depends on the model.
•The pipeline system should reach minimum rated gas pressure value for
the heater to perform the rated thermal load.
•Before connecting up the appliance it is necessary to thoroughly flush and
purge the water and gas pipes in order to remove filings or other waste
from them.
•Connect the gas transferring pipe to the relevant gas inlet nozzle and apply
clamp to tighten the hose. When pipeline gas is adopted, gas company
should apply corresponding hose where meter with flow value more than 3
m
3
/h is recommended.
•Purge air from the gas supply pipes.
•Test gas circuit for tightness in accordance with current regulation.
Use appliance only with type of gas, stated on the marking plate!
The maximum inlet gas (G20) pressure must be limited to 18 mbar.
Minimum gas (G20) pressure must be higher than 10 mbar.
4. Installation of exhaust flue pipe
The gas water heater should be equipped with an exhaust pipe or a chimney.
Please pay attention to the specific regulations for installation required by the
local country.
•
Gas water heater can be started only when
exhaust flue pipe installation is finished.
Please pay attention to the requirements
for the installation.
•The parts of the exhaust flue pipe should
be equipped with solid exhaust pipe.
•Exhaust flue pipe should be made of
rustproof material.
•Horizontal part of the exhaust flue pipe
shall have 1% inclination. There shall be
Φ=10 mm hole at the lowest point of the
vertical part of the pipe for the purpose of
draining water drops.
•Distance between exhaust flue pipe and
any flammable materials should be more
than 150 mm. If the exhaust pipe needs to
go through flammable material or wall,
heat shield should be used.
•The exhaust flue pipe should be fixed
thoroughly.
•The exhaust flue pipe outlet must be
installed outside.
Do not touch the exhaust flue pipe after
use to avoid scalding.
A ≥250 mm
A + B ≥2000mm
B
A
1°
OUTSIDEINSIDE
Φ10 mm
draining hole

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INSTALLATION INSTRUCTIONS
Commissioning
Once the gas water heater installation has been completed, it is necessary to
commission the appliance as follows:
1. Gas supply installation:
Inspect the entire installation including the meter, test for tightness and purge
in accordance with current regulation.
2. Water supply installation:
Inspect the water pipe installation for water tightness.
3. Make sure that type of gas complies with the type of gas stated on the rating
label.
4. Open the air inlet in the room.
5. Check if the exhaust flue pipe is correctly installed.
Lighting the appliance for the first time:
1. Open the battery compartment on the bottom of the gas water heater and put
two batteries in (2 x type D battery).
2. Ensure that the gas inlet valve and cold water inlet valve below the appliance
are open.
3. Open the hot water tap and ensure that air is purged from the appliance and
the pipes.
4. Turn on the on / off switch.
5. Turn the gas regulating knob to its maximum position.
6. Turn on a hot water tap.
The appliance will attempt to ignite, should this fail due to air in the gas pipe.
Several ignition attempts may be required to light the gas for the first time. If a
problem comes up after normal operation, turn off the water immediately. Re-
try 10-20 seconds later to avoid ‘pop’ burning.
Do not touch the housing of the gas water heater during operation. During
operation only setting knobs can be touched.
Risk of scalding.

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INSTALLATION INSTRUCTIONS
Repair and maintenance
Note:
All the repair and maintenance must be carried out by authorized technicians. The
maintenance of the water heater must be fulfilled at least once a year. It is
recommended to carry out the maintenance after a period of heating operation. The
maintenance and repair must be kept in record. Before cleaning or maintenance and
repair, please take off battery from the water heater and turn down the gas valve.
Only the original spare parts for maintenance can be used.
If the spare parts used for maintenance are not original, the manufacturer does not
assume any quality guarantee. The connecting pieces must be new.
To ensure safe and effective operation, the appliance must be serviced
once a year by a Gas Safe registered engineer.
1. Daily maintenance done by the end user:
•Check the gas pipe regularly for leakage or any defect. If in doubt contact service
center.
•Clean water filter on cold water inlet regularly.
•Check water leakage regularly.
•When flame turns from blue to yellow with black smoke, close the gas valve and
call service center immediately for help.
•Check the exhaust flue pipe frequently to avoid the jam. If the exhaust gas cannot
go outside it can lead to CO poisoning.
•Check the ventilation.
•Check the appearance of the appliance.
•Check if any strange sound occurs during usage.
•When you plan not to use the appliance for a longer period of time, close the gas
and water valves and remove the batteries from battery compartment.
2. Anti-freeze protection
Should the appliance be installed where pipes are subjected to freezing, it is
recommended to empty it.
Proceed as indicated below:
•Turn the outer electrical switch to the OFF position.
•Close the gas valve.
•Close the cold water inlet valve.
•Open the DHW taps until both the appliance and pipes are completely
emptied.
•Screw off the drain valve on water inlet connector.
To resume operation, tighten the drain valve, open the cold water inlet isolation valve
together with DHW taps until water flows steadily from all taps.

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INSTALLATION INSTRUCTIONS
3. Cleaning the housing of a gas water heater
Warning!
A cloth dampened with cold water may be used on the indoor unit if it is very
dirty. Then wipe it with a dry cloth.
Do not use a chemically treated cloth or duster to clean the unit.
Do not use gasoline, thinner, polishing powder, or similar solvents for
cleaning. These may cause the plastic surface to crack or deform.
Never use water hotter than 40°C to clean the front panel, it could cause
deformation of discoloration.

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TROUBLESHOOTING
Trouble
Couse
What should be done?
No flame. Different type of gas as
fuel
Use correct gas.
Air in the gas pipes Open and close hot water
tap for several times.
Unsuitable gas pressure. Contact gas providing
company.
Battery is empty or placed
in wrong direction. Replace the battery. Check polarity of the
batteries
No hot water Open the water inlet valve.
Flame burning , when no
water consumption. Problems with gas mechanism. Call service.
Low water temperature. Gas valve is partially
closed. Open the gas valve completely.
During operation of the
device the flame goes out. The exhaust flue pipe is blocked. Safety thermostat
turned off the device.
1. Check if the exhaust
flue pipe is fluent.
2. Wait for the GWH to
cool down.
3. Close and open the hot
water tap.
Water pressure is too low. Wait for the pressure to
rise.
Clean water filter located
in the cold water inlet.

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SPECIFICATION
Specification
Brand gorenje
Model name GWH 10NNBW
Address of the factory-producer
Guangdong Vanward New Electric Co.,Ltd
No.13, Jianye Mid-Road, Shunde High-Tech
Industry Development Zone, Ronggui, Shunde,
Foshan, Guangdong, China
Address of the company who placed the
order Gorenje, d.d. Partizanska 12, 3503 Velenje, Slovenia
Technical specification
Rated heating power [kW] 20
Max power output [kW] 16,8
Pilot flame no
Ignition Automatic pulse ignition
Gas G20 natural gas
Max gas consumption [m3/h] 2,0
Volume of hot water ∆T=25K [l/min] 10
Min water pressure [bar] 0,2
Max water pressure [bar] 10
Heat efficiency [%] >84%
Type of appliance B11BS
Electric data
Voltage / frequency [VAC/Hz] 3VDC / -
Max electric power consumption [W] /
IP protection IPX0
Weight and dimensions
Dry weight [kg] 9,6
Dimensions W x H x D [mm] 590 x 327 x 180
Water inlet pipe dimensions [mm] G1/2
Water outlet pipe dimensions [mm] G1/2
Gas pipe dimensions [mm] G1/2
Diameter of exhaust pipe [mm] 110