Dewhot NDCT16DH User manual
16lt
Constant Temperature
Page 3 of 30 Dewhot | Gas geyser manual
Read these instructions carefully before operating the
gas geyser and familiarize yourself with the appliance
before connecting it to the gas cylinder. Keep these
instructions for future reference.
This appliance is manufactured to operate on LPG
only. Do not tamper or modify the appliance. Never
install this appliance indoors.
If you smell gas
1. Turn o the gas supply at the bottle
2. Extinguish all naked ames
3. Do not operate any electrical
appliances
4. Ventilate the area
5. Check for leaks as described in this
manual
6. If gas smell persists, contact your
dealer or gas supplier immediately
Burn-back
In the event of a burn-back, where the
ame burns back to the jet, immediately
turn the gas supply o at the gas cylinder.
After ensuring the ame is extinguished,
wait for I minute and then reignite the
appliance as per normal. Should the
appliance burn back again, close the gas
cylinder and call a registered LPG installer.
Do not use the appliance again until the
installer has conrmed that it is safe to
do so.
Gas-pressure regulator
This appliance requires an operating
pressure of 2,8 kpa. Only install a LPG
regulator that complies with the
SANS 1237 requirements.
Guarantee
After installation, please register your
product on the Dewhot website (www.
gasgeysers.co.za/product-registration)
You will need your invoice and Certicate
of Compliance (COC) to complete the
registration.
Important
Page 4 of 30 Dewhot | Gas geyser manual
Parts Diagram LCD screen
Controller
box
LCD
screen
Pilot
assembly
Pilot
jet
Gas
valve
Battery
Box
Pilot
tube
Burner
Washer
Burner
Jet Bar
Test Point
Page 5 of 30
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
Outlet Temp sensor
850C Temp sensor
1100C Temp sensor
Cover
Chimney box
Inlet water valve
Water ow sensor
Inlet Temperature sensor
Radiator
Page 6 of 30 Dewhot | Gas geyser manual
Technical parameters
Description Constant temperature
Model no NDCT16DH
Model Type D
Gas type LPG
Max gas pressure 2,8kpa
Rated input 32kw
Water pressure 20-500 kPa
Maximum Water Flow 16L/min
Max Gas Consumption 2.3 kg/h
Unit Size 730x 400x 220mm
GW 15.5kg NW 13.3kg
Page 7 of 30
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
CONSTANT HOT WATER SUPPLY
The water heater will achieve and maintain
the water temperature set on the digital
display automatically irrespective of
changing water ow and temperatures
TEMPERATURE MEMORY
FUNCTION
The CPU of the controller will remember
the temperature settings from the
previous use, improving the reaction
time upon start up.
EASY OPERATION
Simplicity of adjusting the temperature
of the hot water by 1°C increments at the
touch of a button.
PILOT IGNITION
The pilot burner will automatically ignite
rst, then the main burner. The pilot will
then go o avoiding excessive gas usage.
CAN BE USED TO BACK UP
SOLAR GEYSERS
Use this gas geyser in conjuction with
our solar to gas valve to boost your solar
water temperature in the winter months or
colder, cloudier summer days.
FLAME OUT SENSOR
This is designed to automatically cut o
the gas supply should the ame/ burner
unexpectedly extinguish or the sensor no
longer detects a ame.
LOW WATER PRESSURE
START UP
The appliance will activate from a
water flow of 3lt/min. This makes
it suitable for low water pressure
applications.
OVER PRESSURISATION/
FREEZING PROTECTION
The appliance will automatically protect
itself by releasing pressure if the water
supply is over 10 Bar (this should be
manually set to lower pressures see page
13).
AUTOMATIC GAS ADJUSTMENT
The appliance will automatically adjust its
gas usage depending on the water usage,
using less gas when you use less water,
making the appliance more ecient.
Functions & Features
Page 8 of 30 Dewhot | Gas geyser manual
Appliance Safety instructions
PROPER VENTILATION
To avoid the risk of re, explosion, or
asphyxiation never operate the gas geyser
unless it is installed properly and has
adequate air supply. Make sure the ue
terminal is installed properly for the initial
start-up, check it annually thereafter.
FLAMMABLE MATERIALS
DO NOT handle, use or store combustible
materials near to the gas geyser.
WEATHER BOX AND FLUE
This geyser should be installed with a cover
under all cicumstances. A ue can be used
with a cowl but is not a reqirement for the
geyser to operate normally.
WATER TEMPERATURE
SETTING
Safety and energy savings need to be
considered when setting the water
temperature . Water temperatures above
52°C can cause severe burns.
Refer to page 16.
1. Households with small children, disabled
or elderly people need to set the
temperature to 49°C or lower
2. Maximum water temperature occurs
when the burner is on. To see the water
temperature look at the front control
panel of the gas geyser.
3. The Factory default water setting is 41°C
and this setting can be adjusted on the
control panel.
4. The gas geyser has a heating range
between 38°C and 60°C.
TIME/TEMPERATURE EXPOSURE RESULTING IN BURNS
Hot water can create severe burns, we should rarely exceed the temperatures below
49°C More than 5 minutes
52°C 1.5 to 2 minutes
55°C +/- 30 seconds
57°C +/- 10 seconds
60°C less than 5 seconds
63°C less than 3 seconds
66°C +/- 1.5 to 2 seconds
69°C +/- 1 second
Page 9 of 30
Dewhot | Gas geyser manual
Dewhot | Gas geyser manual
NATURAL AND LP GAS
Both LP and natural gas are odoured to
help detect leaks.
Appliances using LP gas are dierent from
natural gas models. A natural gas geyser
can not function safely on LP gas and vice
versa.
Do not try to convert the gas geyser from
a natural gas to a LP gas appliance and vice
versa. This could damage the appliance,
cause injuries or res. Never connect the
gas geyser to a fuel type that is not in
accordance with the appliance’s data table.
WHEN DETECTING A LEAK ON
YOUR INSTALLATION
LP gas is twice as heavy as air and may
accumulate in low lying areas and cavities.
Before opening the hot water tap to test
your gas geyser have your installer check
all gas ttings and connections. Bubbles
indicate a leak.
1. Do not attempt to nd the cause
yourself and turn o the gas supply in
nding a leak.
2. Do not ignite any appliance.
3. Do not touch any electrical switch.
4. Evacuate the house immediately with
your family and pets.
5. Leave the doors open for ventilation and
contact the gas supplier, registered LP
Gas Installer or Fire Department.
6. Stay away from the house (or building)
until the service call has been made,
the leak is xed and the space has been
declared as safe.
7. Ask the installer to show you where the
gas shut-o valve is and how to use it.
8. Turn o the manual shut-o valve if
the gas geyser has been subjected to
overheating, re, ood, physical damage
or if the gas supply fails to shut o.
Gas detectors are highly recommended
and they must be installed in accordance to
the detector manufacturer’s regulations.
GAS SUPPLY
1. The gas type should match the
specication table. This is a low pressure
gas applinace and the appropriate
regulator should be used.
2. Ensure there is sucient gas pressure
(2,8kPa) for the gas supply.
3. The gas line should be equipped with a
shut o valve.
4. At least a soapy solution must be used
to check all connections and ttings for
gas leaks.
5. The COC should be issued and signed
after the installation has been inspected.
Page 10 of 30 Dewhot | Gas geyser manual
Installation instructions
LFLUES AND COVERS
1. The gas geyser does not require a ue
in order to operate normally. If a ue is
used - a ue cowl should be installed to
prevent rain from entering the geyser.
2. Make sure the ue terminal is
installed properly with all parts of the
ue facing upward to allow hot air
to escape.
3. The ue will expell warm air and water
vapour, do not install the terminal of
the ue near areas/objects that can
be damgeded from the above or are
combustible. (see gas geyser location)
4. Under no circumstances can you install
this geyser indoors
5. For any installation a weather
box should be installed to retain
the warrentee.
MOUNTING THE GAS GEYSER
Install the appliance in a place that allows
for easy access for future servicing and
replacing batteries.
Use at least 8mm concrete plugs and screws
to mount the gas geyser to the wall. In the
case of dry walling use dry wall anchors.
WATER SUPPLY
This appliance must only be used with the
following water supply requirements:
1. Clean, potable water free of
corrosive chemicals, sand, dirt, or
other contaminants.
2. With inlet water temperatures above 0°C,
but not exceeding 45°C
3. Free of lime and scale deposits
4. DO NOT reverse the hot and cold water
connections, this will not allow the gas
geyser to function.
GAS GEYSER LOCATION
1. Close to ue the extraction area .
2. Protected from freezing temperatures.
3. Clear 800mm of space from
combustible surfaces.
4. Suciently ventilated.
5. Free of corrosive elements and ammable
vapours.
6. Have sucient space to service the
appliance.
7. It should be securely mounted to the wall.
8. Installed at least 1400mm o the ground.
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